二进制安装k8s集群V1.23.0
通过二进制方式部署k8s集群，多master
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目录
5、所有节点关闭firewalld 、dnsmasq、selinux
11、开启一些k8s集群中必须的内核参数，所有节点配置k8s内核
12、所有节点配置完内核后，重启服务器，保证重启后内核依旧加载
1.7 所有节点将Containerd的Cgroup改为Systemd
1.8 所有节点将sandbox_image的Pause镜像改成符合自己版本的地址
2.2 由于新版Kubelet建议使用systemd，所以把Docker的CgroupDriver也改成systemd
2.5 将证书复制到其他节点,etcd安装的节点：master01、master02、master03
3.2 生成apiserver的聚合证书。Requestheader-client-xxx requestheader-allowwd-xxx:aggerator
3.8 创建ServiceAccount Key à secret
1、所有Master节点安装keepalived和haproxy
6、所有master节点启动haproxy和keepalived
1.4 所有Master节点开启kube-apiserver
2.1 所有Master节点添加配置文件kube-controller-manager.service
2.2 所有Master节点启动kube-controller-manager
3.1 所有Master节点配置kube-scheduler.service
2、可以正常查询集群状态，才可以继续往下，否则不行，需要排查k8s组件是否有故障
2.3 所有节点配置kubelet service的配置文件（也可以写到kubelet.service）
3.3 所有节点添加kube-proxy的配置和service文件
2.1 将coredns的serviceIP改成k8s service网段的第十个IP
3.6 将token值输入到令牌后，单击登录即可访问Dashboard
一、集群规划
| 主机名 | IP地址 | 说明 |
|---|---|---|
| k8s-master01 | 192.168.126.129 | master节点1 |
| k8s-master02 | 192.168.126.130 | master节点2 |
| k8s-master03 | 192.168.126.131 | master节点3 |
| k8s-master-lb | 192.168.126.200 |
keepalived虚拟IP |
| k8s-node01 | 192.168.126.131 | worker节点1 |
| k8s-node02 | 192.168.126.132 | worker节点2 |
| 配置信息 | 备注 |
|---|---|
| 系统版本 | CentOS 7.9.2009 |
| Docker版本 | 20.10.17 |
| 宿主机网段 | 192.168.126.0/24 |
| Pod网段 | 172.16.0.0/12 |
| Service网段 | 10.96.0.0/16 |
二、基础环境配置
1、配置/etc/hosts文件
[root@localhost ~]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.126.129 k8s-master01
192.168.126.130 k8s-master02
192.168.126.131 k8s-master03
192.168.126.200 k8s-master-lb # 如果不是高可用集群，该IP为Master01的IP
192.168.126.132 k8s-node01
192.168.126.133 k8s-node022、设置主机名
hostnamectl set-hostname k8s-master01
hostnamectl set-hostname k8s-master02
hostnamectl set-hostname k8s-master03
hostnamectl set-hostname k8s-node01
hostnamectl set-hostname k8s-node023、安装yum源（Centos7）
所有主机执行
[root@localhost ~]# curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
[root@localhost ~]# yum install -y yum-utils device-mapper-persistent-data lvm2
[root@localhost ~]# yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
[root@localhost ~]# sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo4、必备工具安装
[root@localhost ~]# yum install wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 git -y5、所有节点关闭firewalld 、dnsmasq、selinux
CentOS7需要关闭NetworkManager，CentOS8不需要
[root@localhost ~]# systemctl disable --now firewalld
[root@localhost ~]# systemctl disable --now dnsmasq
[root@localhost ~]# systemctl disable --now NetworkManager
[root@localhost ~]# setenforce 0
[root@localhost ~]# sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/sysconfig/selinux
[root@localhost ~]# sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config6、所有节点关闭swap分区，fstab注释swap
[root@localhost ~]# swapoff -a && sysctl -w vm.swappiness=0
[root@localhost ~]# sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab7、所有节点同步时间
安装ntpdate
[root@localhost ~]# rpm -ivh http://mirrors.wlnmp.com/centos/wlnmp-release-centos.noarch.rpm
[root@localhost ~]# yum install ntpdate -y
所有节点同步时间。时间同步配置如下：
[root@localhost ~]# ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
[root@localhost ~]# echo 'Asia/Shanghai' >/etc/timezone
[root@localhost ~]# ntpdate time2.aliyun.com
30 Jun 12:38:19 ntpdate[12176]: adjust time server 203.107.6.88 offset -0.002743 sec
# 加入到crontab
[root@localhost ~]# crontab -e
*/5 * * * * /usr/sbin/ntpdate time2.aliyun.com8、所有节点配置limit
[root@localhost ~]# ulimit -SHn 65535
[root@localhost ~]# vim /etc/security/limits.conf
# 末尾添加如下内容
* soft nofile 65536
* hard nofile 131072
* soft nproc 65535
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited 9、Master01节点免密钥登录其他节点
[root@k8s-master01 ~]# ssh-keygen -t rsa
Master01配置免密码登录其他节点
[root@k8s-master01 ~]# for i in k8s-master01 k8s-master02 k8s-master03 k8s-node01 k8s-node02;do ssh-copy-id -i .ssh/id_rsa.pub $i;done10、Master01下载安装文件
[root@k8s-master01 ~]# cd /opt/ ; git clone https://github.com/dotbalo/k8s-ha-install.git
Cloning into 'k8s-ha-install'...
remote: Enumerating objects: 12, done.
remote: Counting objects: 100% (12/12), done.
remote: Compressing objects: 100% (11/11), done.
remote: Total 461 (delta 2), reused 5 (delta 1), pack-reused 449
Receiving objects: 100% (461/461), 19.52 MiB | 4.04 MiB/s, done.
Resolving deltas: 100% (163/163), done.三、内核升级
1、创建文件夹（所有节点）
[root@k8s-master01 ~]# mkdir -p /opt/kernel2、在master01节点下载内核
[root@k8s-master01 ~]# cd /opt/kernel
[root@k8s-master01 ~]# wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-devel-4.19.12-1.el7.elrepo.x86_64.rpm
[root@k8s-master01 ~]# wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-4.19.12-1.el7.elrepo.x86_64.rpm3、从master01节点传到其他节点
[root@k8s-master01 ~]# for i in k8s-master02 k8s-master03 k8s-node01 k8s-node02;do scp kernel-ml-4.19.12-1.el7.elrepo.x86_64.rpm kernel-ml-devel-4.19.12-1.el7.elrepo.x86_64.rpm $i:/opt/kernel; done4、所有节点安装内核
cd /opt/kernel && yum localinstall -y kernel-ml*5、所有节点更改内核启动顺序
[root@k8s-master01 ~]# grub2-set-default 0 && grub2-mkconfig -o /etc/grub2.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.19.12-1.el7.elrepo.x86_64
Found initrd image: /boot/initramfs-4.19.12-1.el7.elrepo.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-693.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-693.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-1c01f6af1f1d40ccb9988c844650f9a3
Found initrd image: /boot/initramfs-0-rescue-1c01f6af1f1d40ccb9988c844650f9a3.img
[root@k8s-master01 kernel]# grubby --args="user_namespace.enable=1" --update-kernel="$(grubby --default-kernel)"6、检查默认内核是不是4.19
[root@k8s-master01 kernel]# grubby --default-kernel
/boot/vmlinuz-4.19.12-1.el7.elrepo.x86_647、所有节点重启，然后检查内核是不是4.19
[root@k8s-master01 kernel]# reboot
[root@k8s-master01 ~]# uname -a
Linux k8s-master01 4.19.12-1.el7.elrepo.x86_64 #1 SMP Fri Dec 21 11:06:36 EST 2018 x86_64 x86_64 x86_64 GNU/Linux8、所有节点安装配置ipvsadm
[root@k8s-master01 ~]# yum install ipvsadm ipset sysstat conntrack libseccomp -y9、所有节点配置ipvs模块
注意：在内核4.19+版本nf_conntrack_ipv4已经改为nf_conntrack， 4.18以下使用nf_conntrack_ipv4即可：
[root@k8s-master01 ~]# modprobe -- ip_vs
[root@k8s-master01 ~]# modprobe -- ip_vs_rr
[root@k8s-master01 ~]# modprobe -- ip_vs_wrr
[root@k8s-master01 ~]# modprobe -- ip_vs_sh
[root@k8s-master01 ~]# modprobe -- nf_conntrack
[root@k8s-master01 ~]# vim /etc/modules-load.d/ipvs.conf
# 加入以下内容
ip_vs
ip_vs_lc
ip_vs_wlc
ip_vs_rr
ip_vs_wrr
ip_vs_lblc
ip_vs_lblcr
ip_vs_dh
ip_vs_sh
ip_vs_fo
ip_vs_nq
ip_vs_sed
ip_vs_ftp
ip_vs_sh
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
# 重新启动模块：
[root@k8s-master01 ~]# systemctl enable --now systemd-modules-load.service10、检查是否加载
[root@k8s-master01 ~]# lsmod | grep -e ip_vs -e nf_conntrack
ip_vs_sh 16384 0
ip_vs_wrr 16384 0
ip_vs_rr 16384 0
ip_vs 151552 6 ip_vs_rr,ip_vs_sh,ip_vs_wrr
nf_conntrack 143360 1 ip_vs
nf_defrag_ipv6 20480 1 nf_conntrack
nf_defrag_ipv4 16384 1 nf_conntrack
libcrc32c 16384 3 nf_conntrack,xfs,ip_vs11、开启一些k8s集群中必须的内核参数，所有节点配置k8s内核
[root@k8s-master01 ~]# cat <<EOF > /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
fs.may_detach_mounts = 1
vm.overcommit_memory=1
net.ipv4.conf.all.route_localnet = 1
vm.panic_on_oom=0
fs.inotify.max_user_watches=89100
fs.file-max=52706963
fs.nr_open=52706963
net.netfilter.nf_conntrack_max=2310720
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl =15
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_orphans = 327680
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.ip_conntrack_max = 65536
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 0
net.core.somaxconn = 16384
EOF
# 重新加载
[root@k8s-master01 ~]# sysctl --system12、所有节点配置完内核后，重启服务器，保证重启后内核依旧加载
[root@k8s-master01 ~]# reboot
[root@k8s-master01 ~]# lsmod | grep --color=auto -e ip_vs -e nf_conntrack
ip_vs_ftp 16384 0
nf_nat 32768 1 ip_vs_ftp
ip_vs_sed 16384 0
ip_vs_nq 16384 0
ip_vs_fo 16384 0
ip_vs_sh 16384 0
ip_vs_dh 16384 0
ip_vs_lblcr 16384 0
ip_vs_lblc 16384 0
ip_vs_wrr 16384 0
ip_vs_rr 16384 0
ip_vs_wlc 16384 0
ip_vs_lc 16384 0
ip_vs 151552 24 ip_vs_wlc,ip_vs_rr,ip_vs_dh,ip_vs_lblcr,ip_vs_sh,ip_vs_fo,ip_vs_nq,ip_vs_lblc,ip_vs_wrr,ip_vs_lc,ip_vs_sed,ip_vs_ftp
nf_conntrack 143360 2 nf_nat,ip_vs
nf_defrag_ipv6 20480 1 nf_conntrack
nf_defrag_ipv4 16384 1 nf_conntrack
libcrc32c 16384 4 nf_conntrack,nf_nat,xfs,ip_vs四、Runtime安装
1、Containerd作为Runtime
1.1 所有节点安装docker-ce-20.10
[root@k8s-master01 ~]# yum install docker-ce-20.10.* docker-ce-cli-20.10.* containerd -y
[root@k8s-master01 ~]# docker version
Client: Docker Engine - Community
Version: 20.10.17
API version: 1.41
Go version: go1.17.11
Git commit: 100c701
Built: Mon Jun 6 23:05:12 2022
OS/Arch: linux/amd64
Context: default
Experimental: true1.2 首先配置Containerd所需的模块（所有节点）
[root@k8s-master01 ~]# cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOF
1.3 所有节点加载模块
[root@k8s-master01 ~]# modprobe -- overlay
[root@k8s-master01 ~]# modprobe -- br_netfilter1.4 所有节点，配置Containerd所需的内核
[root@k8s-master01 ~]# cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
> net.bridge.bridge-nf-call-iptables = 1
> net.ipv4.ip_forward = 1
> net.bridge.bridge-nf-call-ip6tables = 1
> EOF
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 11.5 所有节点加载内核
[root@k8s-master01 ~]# sysctl --system1.6 所有节点配置Containerd的配置文件
[root@k8s-master01 ~]# mkdir -p /etc/containerd
[root@k8s-master01 ~]# containerd config default | tee /etc/containerd/config.toml1.7 所有节点将Containerd的Cgroup改为Systemd
[root@k8s-master01 ~]# vim /etc/containerd/config.toml
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
BinaryName = ""
CriuImagePath = ""
CriuPath = ""
CriuWorkPath = ""
IoGid = 0
IoUid = 0
NoNewKeyring = false
NoPivotRoot = false
Root = ""
ShimCgroup = ""
SystemdCgroup = true找到containerd.runtimes.runc.options，添加SystemdCgroup = true（如果已存在直接修改，否则会报错），如下图所示：
1.8 所有节点将sandbox_image的Pause镜像改成符合自己版本的地址
registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.6
[root@k8s-master01 ~]# vim /etc/containerd/config.toml
sandbox_image = "registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.6"1.9 所有节点启动Containerd，并配置开机自启动
[root@k8s-master01 ~]# systemctl daemon-reload
[root@k8s-master01 ~]# systemctl enable --now containerd
[root@k8s-master01 ~]# systemctl status containerd.service
● containerd.service - containerd container runtime
Loaded: loaded (/usr/lib/systemd/system/containerd.service; enabled; vendor preset: disabled)
Active: active (running) since 四 2022-06-30 14:23:16 CST; 2min 36s ago
Docs: https://containerd.io
Process: 1720 ExecStartPre=/sbin/modprobe overlay (code=exited, status=0/SUCCESS)
Main PID: 1722 (containerd)
Tasks: 9
Memory: 25.6M
CGroup: /system.slice/containerd.service
└─1722 /usr/bin/containerd
6月 30 14:23:16 k8s-master01 containerd[1722]: time="2022-06-30T14:23:16.759584551+08:00" level=info msg="Start subscribing containerd event"
6月 30 14:23:16 k8s-master01 containerd[1722]: time="2022-06-30T14:23:16.759661538+08:00" level=info msg="Start recovering state"
6月 30 14:23:16 k8s-master01 containerd[1722]: time="2022-06-30T14:23:16.759744630+08:00" level=info msg="Start event monitor"
6月 30 14:23:16 k8s-master01 containerd[1722]: time="2022-06-30T14:23:16.759769518+08:00" level=info msg="Start snapshots syncer"
6月 30 14:23:16 k8s-master01 containerd[1722]: time="2022-06-30T14:23:16.759785914+08:00" level=info msg="Start cni network conf syncer for default"
6月 30 14:23:16 k8s-master01 containerd[1722]: time="2022-06-30T14:23:16.759797273+08:00" level=info msg="Start streaming server"
6月 30 14:23:16 k8s-master01 containerd[1722]: time="2022-06-30T14:23:16.760121521+08:00" level=info msg=serving... address=/run/containerd/containerd.sock.ttrpc
6月 30 14:23:16 k8s-master01 containerd[1722]: time="2022-06-30T14:23:16.760180705+08:00" level=info msg=serving... address=/run/containerd/containerd.sock
6月 30 14:23:16 k8s-master01 containerd[1722]: time="2022-06-30T14:23:16.760285440+08:00" level=info msg="containerd successfully booted in 0.053874s"
6月 30 14:23:16 k8s-master01 systemd[1]: Started containerd container runtime.1.10 所有节点配置crictl客户端连接的运行时位置
[root@k8s-master01 ~]# cat > /etc/crictl.yaml <<EOF
runtime-endpoint: unix:///run/containerd/containerd.sock
image-endpoint: unix:///run/containerd/containerd.sock
timeout: 10
debug: false
EOF
2、Docker作为Runtime
2.1 所有节点安装docker-ce 20.10：
[root@k8s-master01 ~]# yum install docker-ce-20.10.* docker-ce-cli-20.10.* -y2.2 由于新版Kubelet建议使用systemd，所以把Docker的CgroupDriver也改成systemd
[root@k8s-master01 ~]# mkdir /etc/docker
[root@k8s-master01 ~]# cat > /etc/docker/daemon.json <<EOF
{
"exec-opts": ["native.cgroupdriver=systemd"]
}
EOF2.3 所有节点设置开机自启动Docker
[root@k8s-master01 ~]# systemctl daemon-reload && systemctl enable --now docker五、k8s及etcd安装
1、Master01下载kubernetes安装包
1.23.0需要更改为你看到的最新版本
[root@k8s-master01 opt]# wget https://dl.k8s.io/v1.23.0/kubernetes-server-linux-amd64.tar.gz2、下载etcd安装包
[root@k8s-master01 ~]# wget https://github.com/etcd-io/etcd/releases/download/v3.5.1/etcd-v3.5.1-linux-amd64.tar.gz3、解压kubernetes安装文件
[root@k8s-master01 opt]# tar -xf kubernetes-server-linux-amd64.tar.gz --strip-components=3 -C /usr/local/bin kubernetes/server/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy}4、解压etcd安装文件
[root@k8s-master01 opt]# tar xf etcd-v3.5.1-linux-amd64.tar.gz --strip-components=1 -C /usr/local/bin etcd-v3.5.1-linux-amd64/etcd{,ctl}5、版本查看
[root@k8s-master01 opt]# kubelet --version
Kubernetes v1.23.0
[root@k8s-master01 opt]# etcdctl version
etcdctl version: 3.5.1
API version: 3.56、将组件发送到其他节点
[root@k8s-master01 opt]# MasterNodes='k8s-master02 k8s-master03'
[root@k8s-master01 opt]# WorkNodes='k8s-node01 k8s-node02'
[root@k8s-master01 opt]# for NODE in $MasterNodes; do echo $NODE; scp /usr/local/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy} $NODE:/usr/local/bin/; scp /usr/local/bi
n/etcd* $NODE:/usr/local/bin/; done
[root@k8s-master01 opt]# for NODE in $WorkNodes; do scp /usr/local/bin/kube{let,-proxy} $NODE:/usr/local/bin/ ; done7、所有节点创建/opt/cni/bin目录
[root@k8s-master01 opt]# mkdir -p /opt/cni/bin8、切换分支
Master01节点切换到1.23.x分支（其他版本可以切换到其他分支，.x即可，不需要更改为具体的小版本）
[root@k8s-master01 opt]# cd k8s-ha-install/
[root@k8s-master01 k8s-ha-install]# ls
k8s-deployment-strategies.md LICENSE metrics-server-0.3.7 metrics-server-3.6.1 README.md
[root@k8s-master01 k8s-ha-install]# git checkout manual-installation-v1.23.x
分支 manual-installation-v1.23.x 设置为跟踪来自 origin 的远程分支 manual-installation-v1.23.x。
切换到一个新分支 'manual-installation-v1.23.x'
[root@k8s-master01 k8s-ha-install]# ls
bootstrap calico CoreDNS csi-hostpath dashboard kubeadm-metrics-server metrics-server pki snapshotter六、生成证书
1、Master01下载生成证书工具
[root@k8s-master01 ~]# wget "https://pkg.cfssl.org/R1.2/cfssl_linux-amd64" -O /usr/local/bin/cfssl
[root@k8s-master01 ~]# wget "https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64" -O /usr/local/bin/cfssljson
[root@k8s-master01 ~]# chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson2、生成etcd证书
2.1 所有Master节点创建etcd证书目录
[root@k8s-master01 ~]# mkdir /etc/etcd/ssl -p2.2 所有节点创建kubernetes相关目录
[root@k8s-master01 ~]# mkdir -p /etc/kubernetes/pki2.3 Master01节点生成etcd证书
生成证书的CSR文件：证书签名请求文件，配置了一些域名、公司、单位
[root@k8s-master01 ~]# cd /opt/k8s-ha-install/pki/
[root@k8s-master01 pki]# ls
admin-csr.json ca-config.json etcd-ca-csr.json front-proxy-ca-csr.json kubelet-csr.json manager-csr.json
apiserver-csr.json ca-csr.json etcd-csr.json front-proxy-client-csr.json kube-proxy-csr.json scheduler-csr.json2.4 生成etcd CA证书和CA证书的key
[root@k8s-master01 pki]# cfssl gencert -initca etcd-ca-csr.json | cfssljson -bare /etc/etcd/ssl/etcd-ca
2022/06/30 16:07:55 [INFO] generating a new CA key and certificate from CSR
2022/06/30 16:07:55 [INFO] generate received request
2022/06/30 16:07:55 [INFO] received CSR
2022/06/30 16:07:55 [INFO] generating key: rsa-2048
2022/06/30 16:07:56 [INFO] encoded CSR
2022/06/30 16:07:56 [INFO] signed certificate with serial number 487000903415403993808075066317587714337578058114
[root@k8s-master01 pki]# cfssl gencert \
-ca=/etc/etcd/ssl/etcd-ca.pem \
-ca-key=/etc/etcd/ssl/etcd-ca-key.pem \
-config=ca-config.json \
-hostname=127.0.0.1,k8s-master01,k8s-master02,k8s-master03,192.168.126.129,192.168.126.130,192.168.126.131 \
-profile=kubernetes \
etcd-csr.json | cfssljson -bare /etc/etcd/ssl/etcd
2022/06/30 16:09:11 [INFO] generate received request
2022/06/30 16:09:11 [INFO] received CSR
2022/06/30 16:09:11 [INFO] generating key: rsa-2048
2022/06/30 16:09:11 [INFO] encoded CSR
2022/06/30 16:09:11 [INFO] signed certificate with serial number 1607351280812799100269022176081170930062314243202.5 将证书复制到其他节点,etcd安装的节点：master01、master02、master03
[root@k8s-master01 pki]# MasterNodes='k8s-master02 k8s-master03'
[root@k8s-master01 pki]# for NODE in $MasterNodes; do
ssh $NODE "mkdir -p /etc/etcd/ssl"
for FILE in etcd-ca-key.pem etcd-ca.pem etcd-key.pem etcd.pem; do
scp /etc/etcd/ssl/${FILE} $NODE:/etc/etcd/ssl/${FILE}
done
done3、k8s组件证书
3.1 Master01生成kubernetes证书
[root@k8s-master01 ~]# cd /opt/k8s-ha-install/pki/
[root@k8s-master01 pki]# ls
admin-csr.json ca-config.json etcd-ca-csr.json front-proxy-ca-csr.json kubelet-csr.json manager-csr.json
apiserver-csr.json ca-csr.json etcd-csr.json front-proxy-client-csr.json kube-proxy-csr.json scheduler-csr.json
[root@k8s-master01 pki]# cfssl gencert -initca ca-csr.json | cfssljson -bare /etc/kubernetes/pki/ca
2022/06/30 16:11:48 [INFO] generating a new CA key and certificate from CSR
2022/06/30 16:11:48 [INFO] generate received request
2022/06/30 16:11:48 [INFO] received CSR
2022/06/30 16:11:48 [INFO] generating key: rsa-2048
2022/06/30 16:11:48 [INFO] encoded CSR
2022/06/30 16:11:48 [INFO] signed certificate with serial number 157560449643835006943538059381618105157085683230注意： 10.96.0.是k8s service的网段，如果说需要更改k8s service网段，那就需要更改10.96.0.1，
如果不是高可用集群，192.168.126.200为Master01的IP
[root@k8s-master01 pki]# cfssl gencert -ca=/etc/kubernetes/pki/ca.pem -ca-key=/etc/kubernetes/pki/ca-key.pem -config=ca-config.json -hostname=10.96.0.1,192.168.126.200,127.0.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,192.168.126.129,192.168.126.130,192.168.126.131 -profile=kubernetes apiserver-csr.json | cfssljson -bare /etc/kubernetes/pki/apiserver
2022/07/15 17:00:27 [INFO] generate received request
2022/07/15 17:00:27 [INFO] received CSR
2022/07/15 17:00:27 [INFO] generating key: rsa-2048
2022/07/15 17:00:27 [INFO] encoded CSR
2022/07/15 17:00:27 [INFO] signed certificate with serial number 4179786411363736174319407660111389794296429420963.2 生成apiserver的聚合证书。Requestheader-client-xxx requestheader-allowwd-xxx:aggerator
[root@k8s-master01 pki]# cfssl gencert -initca front-proxy-ca-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-ca
2022/06/30 16:18:04 [INFO] generating a new CA key and certificate from CSR
2022/06/30 16:18:04 [INFO] generate received request
2022/06/30 16:18:04 [INFO] received CSR
2022/06/30 16:18:04 [INFO] generating key: rsa-2048
2022/06/30 16:18:05 [INFO] encoded CSR
2022/06/30 16:18:05 [INFO] signed certificate with serial number 591372355293828701333040192461663363975639312296
[root@k8s-master01 pki]# cfssl gencert -ca=/etc/kubernetes/pki/front-proxy-ca.pem -ca-key=/etc/kubernetes/pki/front-proxy-ca-key.pem -config=ca-config.json -profile=kubernetes front-proxy-client-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-client
2022/07/15 17:01:56 [INFO] generate received request
2022/07/15 17:01:56 [INFO] received CSR
2022/07/15 17:01:56 [INFO] generating key: rsa-2048
2022/07/15 17:01:56 [INFO] encoded CSR
2022/07/15 17:01:56 [INFO] signed certificate with serial number 327356221554221234940140333032459089069219790527
2022/07/15 17:01:56 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
3.3 生成controller-manage的证书
[root@k8s-master01 pki]# cfssl gencert \
-ca=/etc/kubernetes/pki/ca.pem \
-ca-key=/etc/kubernetes/pki/ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
manager-csr.json | cfssljson -bare /etc/kubernetes/pki/controller-manager
2022/06/30 16:19:04 [INFO] generate received request
2022/06/30 16:19:04 [INFO] received CSR
2022/06/30 16:19:04 [INFO] generating key: rsa-2048
2022/06/30 16:19:04 [INFO] encoded CSR
2022/06/30 16:19:04 [INFO] signed certificate with serial number 438428207360344357682042985881400341297359876701
2022/06/30 16:19:04 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").3.4 set-cluster：设置一个集群项
注意，如果不是高可用集群，192.168.126.200:8443改为master01的地址，8443改为apiserver的端口，默认是6443
[root@k8s-master01 pki]# kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true \
--server=https://192.168.126.200:8443 \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
Cluster "kubernetes" set.3.5 设置一个环境项，一个上下文
[root@k8s-master01 pki]# kubectl config set-context system:kube-controller-manager@kubernetes \
--cluster=kubernetes \
--user=system:kube-controller-manager \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
Context "system:kube-controller-manager@kubernetes" created.3.6 set-credentials 设置一个用户项
[root@k8s-master01 pki]# kubectl config set-credentials system:kube-controller-manager \
--client-certificate=/etc/kubernetes/pki/controller-manager.pem \
--client-key=/etc/kubernetes/pki/controller-manager-key.pem \
--embed-certs=true \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
User "system:kube-controller-manager" set.3.7 使用某个环境当做默认环境
[root@k8s-master01 pki]# kubectl config use-context system:kube-controller-manager@kubernetes --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
Switched to context "system:kube-controller-manager@kubernetes".
[root@k8s-master01 pki]# cfssl gencert \
-ca=/etc/kubernetes/pki/ca.pem \
-ca-key=/etc/kubernetes/pki/ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
scheduler-csr.json | cfssljson -bare /etc/kubernetes/pki/scheduler
2022/06/30 16:20:58 [INFO] generate received request
2022/06/30 16:20:58 [INFO] received CSR
2022/06/30 16:20:58 [INFO] generating key: rsa-2048
2022/06/30 16:20:58 [INFO] encoded CSR
2022/06/30 16:20:58 [INFO] signed certificate with serial number 355451230719945708429951668347116585597094494154
2022/06/30 16:20:58 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").注意，如果不是高可用集群，192.168.126.200:8443改为master01的地址，8443改为apiserver的端口，默认是6443
[root@k8s-master01 pki]# kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true \
--server=https://192.168.126.200:8443 \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig
Cluster "kubernetes" set.
[root@k8s-master01 pki]# kubectl config set-credentials system:kube-scheduler \
--client-certificate=/etc/kubernetes/pki/scheduler.pem \
--client-key=/etc/kubernetes/pki/scheduler-key.pem \
--embed-certs=true \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig
User "system:kube-scheduler" set.
[root@k8s-master01 pki]# kubectl config set-context system:kube-scheduler@kubernetes \
--cluster=kubernetes \
--user=system:kube-scheduler \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig
Context "system:kube-scheduler@kubernetes" created.
[root@k8s-master01 pki]# kubectl config use-context system:kube-scheduler@kubernetes \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig
Switched to context "system:kube-scheduler@kubernetes".
[root@k8s-master01 pki]# cfssl gencert \
-ca=/etc/kubernetes/pki/ca.pem \
-ca-key=/etc/kubernetes/pki/ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
admin-csr.json | cfssljson -bare /etc/kubernetes/pki/admin
2022/06/30 16:23:27 [INFO] generate received request
2022/06/30 16:23:27 [INFO] received CSR
2022/06/30 16:23:27 [INFO] generating key: rsa-2048
2022/06/30 16:23:27 [INFO] encoded CSR
2022/06/30 16:23:27 [INFO] signed certificate with serial number 273739376786174903578235331044637308572288752056
2022/06/30 16:23:27 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").注意，如果不是高可用集群，192.168.126.200:8443改为master01的地址，8443改为apiserver的端口，默认是6443
[root@k8s-master01 pki]# kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://192.168.126.200:8443 --kubeconfig=/etc/kubernetes/admin.kubeconfig
Cluster "kubernetes" set.
[root@k8s-master01 pki]# kubectl config set-credentials kubernetes-admin --client-certificate=/etc/kubernetes/pki/admin.pem --client-key=/etc/kubernetes/pki/admin-key.pem --embed-certs=true --kubeconfig=/etc/kubernetes/admin.kubeconfig
User "kubernetes-admin" set.
[root@k8s-master01 pki]# kubectl config set-context kubernetes-admin@kubernetes --cluster=kubernetes --user=kubernetes-admin --kubeconfig=/etc/kubernetes/admin.kubeconfig
Context "kubernetes-admin@kubernetes" created.
[root@k8s-master01 pki]# kubectl config use-context kubernetes-admin@kubernetes --kubeconfig=/etc/kubernetes/admin.kubeconfig
Switched to context "kubernetes-admin@kubernetes".3.8 创建ServiceAccount Key à secret
[root@k8s-master01 pki]# openssl genrsa -out /etc/kubernetes/pki/sa.key 2048
Generating RSA private key, 2048 bit long modulus
...........................................................+++
.+++
e is 65537 (0x10001)
[root@k8s-master01 pki]# openssl rsa -in /etc/kubernetes/pki/sa.key -pubout -out /etc/kubernetes/pki/sa.pub
writing RSA key3.9 发送证书至其他节点
[root@k8s-master01 pki]# for NODE in k8s-master02; do
for FILE in $(ls /etc/kubernetes/pki | grep -v etcd); do
scp /etc/kubernetes/pki/${FILE} $NODE:/etc/kubernetes/pki/${FILE};
done;
for FILE in admin.kubeconfig controller-manager.kubeconfig scheduler.kubeconfig; do
scp /etc/kubernetes/${FILE} $NODE:/etc/kubernetes/${FILE};
done;
done
3.10 查看证书文件
[root@k8s-master01 pki]# ls /etc/kubernetes/pki/
admin.csr apiserver.csr ca.csr controller-manager.csr front-proxy-ca.csr front-proxy-client.csr sa.key scheduler-key.pem
admin-key.pem apiserver-key.pem ca-key.pem controller-manager-key.pem front-proxy-ca-key.pem front-proxy-client-key.pem sa.pub scheduler.pem
admin.pem apiserver.pem ca.pem controller-manager.pem front-proxy-ca.pem front-proxy-client.pem scheduler.csr
[root@k8s-master01 pki]# ls /etc/kubernetes/pki/ |wc -l
23七、etcd配置
k8s的键值数据库，保存集群的一些信息，对集群做的操作都会保存到Etcd数据库中；如果在生产环境中，集群规模特别大的话，建议Etcd机器与Master机器区分开，etcd配置大致相同，注意修改每个Master节点的etcd配置的主机名和IP地址。
|
192.168.126.129 |
Master01 |
Etcd1 |
| 192.168.126.130 |
Master02 |
Etcd2 |
| 192.168.126.131 |
Master03 |
Etcd3 |
1、Master01配置
[root@k8s-master01 ~]# vim /etc/etcd/etcd.config.yml
name: 'k8s-master01'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://192.168.126.129:2380'
listen-client-urls: 'https://192.168.126.129:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.126.129:2380'
advertise-client-urls: 'https://192.168.126.129:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://192.168.126.129:2380,k8s-master02=https://192.168.126.130:2380,k8s-master03=https://192.168.126.131:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
peer-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
peer-client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false2、Master02配置
[root@k8s-master02 ~]# vim /etc/etcd/etcd.config.yml
name: 'k8s-master02'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://192.168.126.130:2380'
listen-client-urls: 'https://192.168.126.130:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.126.130:2380'
advertise-client-urls: 'https://192.168.126.130:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://192.168.126.129:2380,k8s-master02=https://192.168.126.130:2380,k8s-master03=https://192.168.126.131:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
peer-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
peer-client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
3、Master03配置
[root@k8s-master03 ~]# vim /etc/etcd/etcd.config.yml
name: 'k8s-master03'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://192.168.126.131:2380'
listen-client-urls: 'https://192.168.126.131:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.126.131:2380'
advertise-client-urls: 'https://192.168.126.131:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://192.168.126.129:2380,k8s-master02=https://192.168.126.130:2380,k8s-master03=https://192.168.126.131:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
peer-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
peer-client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
4、创建etcd的Service
[root@k8s-node01 ~]# vim /usr/lib/systemd/system/etcd.service
[Unit]
Description=Etcd Service
Documentation=https://coreos.com/etcd/docs/latest/
After=network.target
[Service]
Type=notify
ExecStart=/usr/local/bin/etcd --config-file=/etc/etcd/etcd.config.yml
Restart=on-failure
RestartSec=10
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
Alias=etcd3.service
5、所有Master节点创建etcd的证书目录
[root@k8s-master01 ~]# mkdir /etc/kubernetes/pki/etcd
[root@k8s-master01 ~]# ln -s /etc/etcd/ssl/* /etc/kubernetes/pki/etcd/6、启动etcd
[root@k8s-master01 ~]# systemctl daemon-reload
[root@k8s-master01 ~]# systemctl enable --now etcd
Created symlink from /etc/systemd/system/etcd3.service to /usr/lib/systemd/system/etcd.service.
Created symlink from /etc/systemd/system/multi-user.target.wants/etcd.service to /usr/lib/systemd/system/etcd.service.7、查看etcd状态
[root@k8s-master01 bin]# export ETCDCTL_API=3
[root@k8s-master01 bin]# etcdctl --endpoints="192.168.126.129:2379,192.168.126.130:2379,192.168.126.131:2379" --cacert=/etc/kubernetes/pki/etcd/etcd-ca.pem --cert=/etc/kubernetes/pki/etcd/etcd.pem --key=/etc/kubernetes/pki/etcd/etcd-key.pem endpoint status --write-out=table
+---------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+---------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| 192.168.137.20:2379 | 20cb7e87b49ea5cb | 3.5.1 | 20 kB | false | false | 3 | 12 | 12 | |
| 192.168.137.21:2379 | 5c013a6e225b278d | 3.5.1 | 20 kB | true | false | 3 | 12 | 12 | |
| 192.168.137.22:2379 | 394ddfe89f7d414f | 3.5.1 | 20 kB | false | false | 3 | 12 | 12 | |
+---------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
八、Master节点配置高可用集群
高可用配置（注意：如果不是高可用集群，haproxy和keepalived无需安装）
如果在云上安装也无需执行此章节的步骤，可以直接使用云上的lb，比如阿里云slb，腾讯云elb等
公有云要用公有云自带的负载均衡，比如阿里云的SLB，腾讯云的ELB，用来替代haproxy和keepalived，因为公有云大部分都是不支持keepalived的，另外如果用阿里云的话，kubectl控制端不能放在master节点，推荐使用腾讯云，因为阿里云的slb有回环的问题，也就是slb代理的服务器不能反向访问SLB，但是腾讯云修复了这个问题。
1、所有Master节点安装keepalived和haproxy
[root@k8s-master01 ~]# yum install keepalived haproxy -y2、所有Master配置HAProxy，配置一样
[root@k8s-master01 ~]# vim /etc/haproxy/haproxy.cfg
global
maxconn 2000
ulimit-n 16384
log 127.0.0.1 local0 err
stats timeout 30s
defaults
log global
mode http
option httplog
timeout connect 5000
timeout client 50000
timeout server 50000
timeout http-request 15s
timeout http-keep-alive 15s
frontend k8s-master
bind 0.0.0.0:8443
bind 127.0.0.1:8443
mode tcp
option tcplog
tcp-request inspect-delay 5s
default_backend k8s-master
backend k8s-master
mode tcp
option tcplog
option tcp-check
balance roundrobin
default-server inter 10s downinter 5s rise 2 fall 2 slowstart 60s maxconn 250 maxqueue 256 weight 100
server k8s-master01 192.168.126.129:6443 check
server k8s-master02 192.168.126.130:6443 check
server k8s-master03 192.168.126.131:6443 check
3、所有Master节点配置KeepAlived
3.1 Master01配置
[root@k8s-master01 pki]# vim /etc/keepalived/keepalived.conf
# 注意每个节点的IP和网卡（interface参数）
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state MASTER
interface ens33
mcast_src_ip 192.168.137.129
virtual_router_id 51
priority 101
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.137.200
}
track_script {
chk_apiserver
} }
3.2 Master02配置
[root@k8s-master02 ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state MASTER
interface ens33
mcast_src_ip 192.168.126.130
virtual_router_id 51
priority 101
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.126.200
}
track_script {
chk_apiserver
} }
3.3 Master03配置
[root@k8s-master03 pki]# vim /etc/keepalived/keepalived.conf
# 注意每个节点的IP和网卡（interface参数）
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state MASTER
interface ens33
mcast_src_ip 192.168.137.131
virtual_router_id 51
priority 101
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.137.200
}
track_script {
chk_apiserver
} }
4、所有master节点健康检查配置脚本
# 编辑check_apiserver.sh
[root@k8s-master01 ~]# vim /etc/keepalived/check_apiserver.sh
#!/bin/bash
err=0
for k in $(seq 1 3)
do
check_code=$(pgrep haproxy)
if [[ $check_code == "" ]]; then
err=$(expr $err + 1)
sleep 1
continue
else
err=0
break
fi
done
if [[ $err != "0" ]]; then
echo "systemctl stop keepalived"
/usr/bin/systemctl stop keepalived
exit 1
else
exit 0
fi
5、授权脚本
[root@k8s-master01 ~]# chmod +x /etc/keepalived/check_apiserver.sh6、所有master节点启动haproxy和keepalived
[root@k8s-master01 ~]# systemctl daemon-reload && systemctl enable --now haproxy
Created symlink from /etc/systemd/system/multi-user.target.wants/haproxy.service to /usr/lib/systemd/system/haproxy.service.
[root@k8s-master01 ~]# systemctl enable --now keepalived
Created symlink from /etc/systemd/system/multi-user.target.wants/keepalived.service to /usr/lib/systemd/system/keepalived.service.7、VIP测试
[root@k8s-master01 ~]# ping 192.168.126.200
PING 192.168.126.200 (192.168.126.200) 56(84) bytes of data.
64 bytes from 192.168.126.200: icmp_seq=1 ttl=64 time=0.539 ms
64 bytes from 192.168.126.200: icmp_seq=2 ttl=64 time=0.351 ms
^C
--- 192.168.126.200 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1054ms
rtt min/avg/max/mdev = 0.351/0.445/0.539/0.094 ms
[root@k8s-master01 keepalived]# telnet 192.168.126.200 8443
Trying 172.20.10.200...
Connected to 172.20.10.200.
Escape character is '^]'.
Connection closed by foreign host.
九、Kubernetes组件配置
所有节点创建相关目录：
[root@k8s-master01 ~]# mkdir -p /etc/kubernetes/manifests/ /etc/systemd/system/kubelet.service.d /var/lib/kubelet /var/log/kubernetes1、安装Apiserver
所有Master节点创建kube-apiserver service，# 注意，如果不是高可用集群，192.168.126.200改为master01的地址
1.1 Master01配置
注意本文档使用的k8s service网段为10.96.0.0/16，该网段不能和宿主机的网段、Pod网段的重复，请按需修改
[root@k8s-master01 ~]# vim /usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-apiserver \
--v=2 \
--logtostderr=true \
--allow-privileged=true \
--bind-address=0.0.0.0 \
--secure-port=6443 \
--insecure-port=0 \
--advertise-address=192.168.126.129 \
--service-cluster-ip-range=10.96.0.0/16 \
--service-node-port-range=30000-32767 \
--etcd-servers=https://192.168.126.129:2379,https://192.168.126.130:2379,https://192.168.126.131:2379 \
--etcd-cafile=/etc/etcd/ssl/etcd-ca.pem \
--etcd-certfile=/etc/etcd/ssl/etcd.pem \
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \
--client-ca-file=/etc/kubernetes/pki/ca.pem \
--tls-cert-file=/etc/kubernetes/pki/apiserver.pem \
--tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem \
--kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem \
--kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem \
--service-account-key-file=/etc/kubernetes/pki/sa.pub \
--service-account-signing-key-file=/etc/kubernetes/pki/sa.key \
--service-account-issuer=https://kubernetes.default.svc.cluster.local \
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota \
--authorization-mode=Node,RBAC \
--enable-bootstrap-token-auth=true \
--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \
--proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem \
--proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem \
--requestheader-allowed-names=aggregator \
--requestheader-group-headers=X-Remote-Group \
--requestheader-extra-headers-prefix=X-Remote-Extra- \
--requestheader-username-headers=X-Remote-User
# --token-auth-file=/etc/kubernetes/token.csv
Restart=on-failure
RestartSec=10s
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
1.2 Master02配置
注意本文档使用的k8s service网段为10.96.0.0/16，该网段不能和宿主机的网段、Pod网段的重复，请按需修改
[root@k8s-master02 ~]# vim /usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-apiserver \
--v=2 \
--logtostderr=true \
--allow-privileged=true \
--bind-address=0.0.0.0 \
--secure-port=6443 \
--insecure-port=0 \
--advertise-address=192.168.126.130 \
--service-cluster-ip-range=10.96.0.0/16 \
--service-node-port-range=30000-32767 \
--etcd-servers=https://192.168.126.129:2379,https://192.168.126.130:2379,https://192.168.126.131:2379 \
--etcd-cafile=/etc/etcd/ssl/etcd-ca.pem \
--etcd-certfile=/etc/etcd/ssl/etcd.pem \
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \
--client-ca-file=/etc/kubernetes/pki/ca.pem \
--tls-cert-file=/etc/kubernetes/pki/apiserver.pem \
--tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem \
--kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem \
--kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem \
--service-account-key-file=/etc/kubernetes/pki/sa.pub \
--service-account-signing-key-file=/etc/kubernetes/pki/sa.key \
--service-account-issuer=https://kubernetes.default.svc.cluster.local \
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota \
--authorization-mode=Node,RBAC \
--enable-bootstrap-token-auth=true \
--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \
--proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem \
--proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem \
--requestheader-allowed-names=aggregator \
--requestheader-group-headers=X-Remote-Group \
--requestheader-extra-headers-prefix=X-Remote-Extra- \
--requestheader-username-headers=X-Remote-User
# --token-auth-file=/etc/kubernetes/token.csv
Restart=on-failure
RestartSec=10s
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
1.3 Master03配置
[root@k8s-master03 ~]# vim /usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-apiserver \
--v=2 \
--logtostderr=true \
--allow-privileged=true \
--bind-address=0.0.0.0 \
--secure-port=6443 \
--insecure-port=0 \
--advertise-address=192.168.126.131 \
--service-cluster-ip-range=10.96.0.0/16 \
--service-node-port-range=30000-32767 \
--etcd-servers=https://192.168.126.129:2379,https://192.168.126.130:2379,https://192.168.126.131:2a379 \
--etcd-cafile=/etc/etcd/ssl/etcd-ca.pem \
--etcd-certfile=/etc/etcd/ssl/etcd.pem \
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \
--client-ca-file=/etc/kubernetes/pki/ca.pem \
--tls-cert-file=/etc/kubernetes/pki/apiserver.pem \
--tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem \
--kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem \
--kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem \
--service-account-key-file=/etc/kubernetes/pki/sa.pub \
--service-account-signing-key-file=/etc/kubernetes/pki/sa.key \
--service-account-issuer=https://kubernetes.default.svc.cluster.local \
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota \
--authorization-mode=Node,RBAC \
--enable-bootstrap-token-auth=true \
--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \
--proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem \
--proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem \
--requestheader-allowed-names=aggregator \
--requestheader-group-headers=X-Remote-Group \
--requestheader-extra-headers-prefix=X-Remote-Extra- \
--requestheader-username-headers=X-Remote-User
# --token-auth-file=/etc/kubernetes/token.csv
Restart=on-failure
RestartSec=10s
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target1.4 所有Master节点开启kube-apiserver
[root@k8s-master01 ~]# systemctl daemon-reload && systemctl enable --now kube-apiserver
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-apiserver.service to /usr/lib/systemd/system/kube-apiserver.service.1.5 检测kube-apiserver状态
[root@k8s-master01 ~]# systemctl status kube-apiserver
● kube-apiserver.service - Kubernetes API Server
Loaded: loaded (/usr/lib/systemd/system/kube-apiserver.service; enabled; vendor preset: disabled)
Active: active (running) since 四 2022-06-30 17:09:19 CST; 7s ago
Docs: https://github.com/kubernetes/kubernetes
Main PID: 15096 (kube-apiserver)
Tasks: 13
Memory: 238.7M
CGroup: /system.slice/kube-apiserver.service
└─15096 /usr/local/bin/kube-apiserver --v=2 --logtostderr=true --allow-privileged=true --bind-address=0.0.0.0 --secure-port=6443 --insecure-port=0 --advertise-address=192.168.13...
6月 30 17:09:26 k8s-master01 kube-apiserver[15096]: I0630 17:09:26.875147 15096 cluster_authentication_trust_controller.go:165] writing updated authentication info to kube-s...hentication
6月 30 17:09:26 k8s-master01 kube-apiserver[15096]: I0630 17:09:26.885094 15096 cache.go:39] Caches are synced for APIServiceRegistrationController controller
6月 30 17:09:26 k8s-master01 kube-apiserver[15096]: I0630 17:09:26.885523 15096 shared_informer.go:247] Caches are synced for crd-autoregister
6月 30 17:09:26 k8s-master01 kube-apiserver[15096]: I0630 17:09:26.886995 15096 cache.go:39] Caches are synced for AvailableConditionController controller
6月 30 17:09:26 k8s-master01 kube-apiserver[15096]: I0630 17:09:26.888674 15096 genericapiserver.go:406] MuxAndDiscoveryComplete has all endpoints registered and discovery in...is complete
6月 30 17:09:26 k8s-master01 kube-apiserver[15096]: I0630 17:09:26.936652 15096 controller.go:611] quota admission added evaluator for: namespaces
6月 30 17:09:26 k8s-master01 kube-apiserver[15096]: I0630 17:09:26.939697 15096 cacher.go:799] cacher (*apiregistration.APIService): 1 objects queued in incoming channel.
6月 30 17:09:26 k8s-master01 kube-apiserver[15096]: I0630 17:09:26.939793 15096 cacher.go:799] cacher (*apiregistration.APIService): 2 objects queued in incoming channel.
6月 30 17:09:26 k8s-master01 kube-apiserver[15096]: I0630 17:09:26.941049 15096 strategy.go:233] "Successfully created FlowSchema" type="suggested" name="system-nodes"
6月 30 17:09:27 k8s-master01 kube-apiserver[15096]: I0630 17:09:27.033187 15096 strategy.go:233] "Successfully created FlowSchema" type="suggested" name="system-node-high"2、安装ControllerManager
所有Master节点配置kube-controller-manager service（所有master节点配置一样）
注意本文档使用的k8s Pod网段为172.16.0.0/12，该网段不能和宿主机的网段、k8s Service网段的重复，请按需修改
2.1 所有Master节点添加配置文件kube-controller-manager.service
[root@k8s-master01 ~]# vim /usr/lib/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-controller-manager \
--v=2 \
--logtostderr=true \
--address=127.0.0.1 \
--root-ca-file=/etc/kubernetes/pki/ca.pem \
--cluster-signing-cert-file=/etc/kubernetes/pki/ca.pem \
--cluster-signing-key-file=/etc/kubernetes/pki/ca-key.pem \
--service-account-private-key-file=/etc/kubernetes/pki/sa.key \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig \
--leader-elect=true \
--use-service-account-credentials=true \
--node-monitor-grace-period=40s \
--node-monitor-period=5s \
--pod-eviction-timeout=2m0s \
--controllers=*,bootstrapsigner,tokencleaner \
--allocate-node-cidrs=true \
--cluster-cidr=172.16.0.0/12 \
--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \
--node-cidr-mask-size=24
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
2.2 所有Master节点启动kube-controller-manager
[root@k8s-master01 ~]# systemctl daemon-reload
[root@k8s-master01 ~]# systemctl enable --now kube-controller-manager
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-controller-manager.service to /usr/lib/systemd/system/kube-controller-manager.service.2.3 查看启动状态
[root@k8s-master01 ~]# systemctl status kube-controller-manager
● kube-controller-manager.service - Kubernetes Controller Manager
Loaded: loaded (/usr/lib/systemd/system/kube-controller-manager.service; enabled; vendor preset: disabled)
Active: active (running) since 四 2022-06-30 17:11:30 CST; 25s ago
Docs: https://github.com/kubernetes/kubernetes
Main PID: 15269 (kube-controller)
Tasks: 10
Memory: 41.0M
CGroup: /system.slice/kube-controller-manager.service
└─15269 /usr/local/bin/kube-controller-manager --v=2 --logtostderr=true --address=127.0.0.1 --root-ca-file=/etc/kubernetes/pki/ca.pem --cluster-signing-cert-file=/etc/kubernetes...
6月 30 17:11:46 k8s-master01 kube-controller-manager[15269]: I0630 17:11:46.423920 15269 shared_informer.go:247] Caches are synced for resource quota
6月 30 17:11:46 k8s-master01 kube-controller-manager[15269]: I0630 17:11:46.462985 15269 shared_informer.go:247] Caches are synced for namespace
6月 30 17:11:46 k8s-master01 kube-controller-manager[15269]: I0630 17:11:46.470820 15269 shared_informer.go:247] Caches are synced for cronjob
6月 30 17:11:46 k8s-master01 kube-controller-manager[15269]: I0630 17:11:46.470881 15269 shared_informer.go:247] Caches are synced for service account
6月 30 17:11:46 k8s-master01 kube-controller-manager[15269]: I0630 17:11:46.492839 15269 shared_informer.go:247] Caches are synced for resource quota
6月 30 17:11:46 k8s-master01 kube-controller-manager[15269]: I0630 17:11:46.492882 15269 resource_quota_controller.go:458] synced quota controller
6月 30 17:11:46 k8s-master01 kube-controller-manager[15269]: I0630 17:11:46.940987 15269 shared_informer.go:247] Caches are synced for garbage collector
6月 30 17:11:46 k8s-master01 kube-controller-manager[15269]: I0630 17:11:46.941029 15269 garbagecollector.go:155] Garbage collector: all resource monitors have synced. Proceed...ct garbage
6月 30 17:11:46 k8s-master01 kube-controller-manager[15269]: I0630 17:11:46.992443 15269 shared_informer.go:247] Caches are synced for garbage collector
6月 30 17:11:46 k8s-master01 kube-controller-manager[15269]: I0630 17:11:46.992487 15269 garbagecollector.go:251] synced garbage collector
Hint: Some lines were ellipsized, use -l to show in full.3、安装Scheduler
所有Master节点配置kube-scheduler service（所有master节点配置一样）
3.1 所有Master节点配置kube-scheduler.service
[root@k8s-master02 ~]# vim /usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-scheduler \
--v=2 \
--logtostderr=true \
--address=127.0.0.1 \
--leader-elect=true \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig
Restart=always
RestartSec=10s
3.2 所有master节点启动scheduler
[root@k8s-master01 ~]# systemctl daemon-reload
[root@k8s-master01 ~]# systemctl enable --now kube-scheduler
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-scheduler.service to /usr/lib/systemd/system/kube-scheduler.service.
[root@k8s-master01 ~]# systemctl status kube-scheduler
● kube-scheduler.service - Kubernetes Scheduler
Loaded: loaded (/usr/lib/systemd/system/kube-scheduler.service; enabled; vendor preset: disabled)
Active: active (running) since 四 2022-06-30 17:12:58 CST; 10s ago
Docs: https://github.com/kubernetes/kubernetes
Main PID: 15390 (kube-scheduler)
Tasks: 7
Memory: 19.2M
CGroup: /system.slice/kube-scheduler.service
└─15390 /usr/local/bin/kube-scheduler --v=2 --logtostderr=true --address=127.0.0.1 --leader-elect=true --kubeconfig=/etc/kubernetes/scheduler.kubeconfig
6月 30 17:13:00 k8s-master01 kube-scheduler[15390]: reserve: {}
6月 30 17:13:00 k8s-master01 kube-scheduler[15390]: score: {}
6月 30 17:13:00 k8s-master01 kube-scheduler[15390]: schedulerName: default-scheduler
6月 30 17:13:00 k8s-master01 kube-scheduler[15390]: ------------------------------------Configuration File Contents End Here---------------------------------
6月 30 17:13:00 k8s-master01 kube-scheduler[15390]: I0630 17:13:00.502751 15390 server.go:139] "Starting Kubernetes Scheduler" version="v1.23.0"
6月 30 17:13:00 k8s-master01 kube-scheduler[15390]: I0630 17:13:00.524215 15390 tlsconfig.go:200] "Loaded serving cert" certName="Generated self signed cert" certDetail="\"localhost@165...
6月 30 17:13:00 k8s-master01 kube-scheduler[15390]: I0630 17:13:00.524655 15390 named_certificates.go:53] "Loaded SNI cert" index=0 certName="self-signed loopback" certDetail="\"apiserv...
6月 30 17:13:00 k8s-master01 kube-scheduler[15390]: I0630 17:13:00.524819 15390 secure_serving.go:200] Serving securely on [::]:10259
6月 30 17:13:00 k8s-master01 kube-scheduler[15390]: I0630 17:13:00.526477 15390 tlsconfig.go:240] "Starting DynamicServingCertificateController"
6月 30 17:13:00 k8s-master01 kube-scheduler[15390]: I0630 17:13:00.627135 15390 leaderelection.go:248] attempting to acquire leader lease kube-system/kube-scheduler...
Hint: Some lines were ellipsized, use -l to show in full.十、TLS Bootstrapping配置
1、在Master01创建bootstrap
注意，如果不是高可用集群，192.168.126.200:8443改为master01的地址，8443改为apiserver的端口，默认是6443
[root@k8s-master01 ~]# cd /opt/k8s-ha-install/bootstrap/
[root@k8s-master01 bootstrap]# ls
bootstrap.secret.yaml
[root@k8s-master01 bootstrap]# kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://192.168.126.200:8443 --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
Cluster "kubernetes" set.
[root@k8s-master01 bootstrap]# kubectl config set-credentials tls-bootstrap-token-user --token=c8ad9c.2e4d610cf3e7426e --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
User "tls-bootstrap-token-user" set.
[root@k8s-master01 bootstrap]# kubectl config set-context tls-bootstrap-token-user@kubernetes --cluster=kubernetes --user=tls-bootstrap-token-user --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
Context "tls-bootstrap-token-user@kubernetes" created.
[root@k8s-master01 bootstrap]# kubectl config use-context tls-bootstrap-token-user@kubernetes --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
Switched to context "tls-bootstrap-token-user@kubernetes".注意：如果要修改bootstrap.secret.yaml的token-id和token-secret，需要保证下图红圈内的字符串一致的，并且位数是一样的。还要保证上个命令的黄色字体：c8ad9c.2e4d610cf3e7426e与你修改的字符串要一致
[root@k8s-master01 bootstrap]# mkdir -p /root/.kube ; cp /etc/kubernetes/admin.kubeconfig /root/.kube/config2、可以正常查询集群状态，才可以继续往下，否则不行，需要排查k8s组件是否有故障
[root@k8s-master01 bootstrap]# kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
etcd-1 Healthy {"health":"true","reason":""}
scheduler Healthy ok
etcd-0 Healthy {"health":"true","reason":""}
etcd-2 Healthy {"health":"true","reason":""} 3、创建bootstrap的secret
[root@k8s-master01 bootstrap]# kubectl create -f bootstrap.secret.yaml
secret/bootstrap-token-c8ad9c created
clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap created
clusterrolebinding.rbac.authorization.k8s.io/node-autoapprove-bootstrap created
clusterrolebinding.rbac.authorization.k8s.io/node-autoapprove-certificate-rotation created
clusterrole.rbac.authorization.k8s.io/system:kube-apiserver-to-kubelet created
clusterrolebinding.rbac.authorization.k8s.io/system:kube-apiserver created十一、Node节点配置
1、Master01节点复制证书至Node节点
2、Kubelet配置
2.1 所有节点创建相关目录
[root@k8s-master01 ~]# mkdir -p /var/lib/kubelet /var/log/kubernetes /etc/systemd/system/kubelet.service.d /etc/kubernetes/manifests/2.2 所有节点配置kubelet service
[root@k8s-master01 ~]# vim /usr/lib/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=docker.service
Requires=docker.service
[Service]
ExecStart=/usr/local/bin/kubelet
Restart=always
StartLimitInterval=0
RestartSec=10
[Install]
WantedBy=multi-user.target
2.3 所有节点配置kubelet service的配置文件（也可以写到kubelet.service）
2.3.1 如果Runtime为Containerd，请使用如下Kubelet的配置
[root@k8s-master01 ~]# vim /etc/systemd/system/kubelet.service.d/10-kubelet.conf
[Service]
Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig --kubeconfig=/etc/kubernetes/kubelet.kubeconfig"
Environment="KUBELET_SYSTEM_ARGS=--network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin --container-runtime=remote --runtime-request-timeout=15m --container-runtime-endpoint=unix:///run/containerd/containerd.sock --cgroup-driver=systemd"
Environment="KUBELET_CONFIG_ARGS=--config=/etc/kubernetes/kubelet-conf.yml"
Environment="KUBELET_EXTRA_ARGS=--node-labels=node.kubernetes.io/node='' "
ExecStart=
ExecStart=/usr/local/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_SYSTEM_ARGS $KUBELET_EXTRA_ARGS
2.3.2 如果Runtime为Docker，请使用如下Kubelet的配置
[root@k8s-master01 ~]#vim /etc/systemd/system/kubelet.service.d/10-kubelet.conf
[Service]
Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig --kubeconfig=/etc/kubernetes/kubelet.kubeconfig"
Environment="KUBELET_SYSTEM_ARGS=--network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin"
Environment="KUBELET_CONFIG_ARGS=--config=/etc/kubernetes/kubelet-conf.yml --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.5"
Environment="KUBELET_EXTRA_ARGS=--node-labels=node.kubernetes.io/node='' "
ExecStart=
ExecStart=/usr/local/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_SYSTEM_ARGS $KUBELET_EXTRA_ARGS
2.4 创建kubelet的配置文件
注意：如果更改了k8s的service网段，需要更改kubelet-conf.yml 的clusterDNS:配置，改成k8s Service网段的第十个地址，比如10.96.0.10
[root@k8s-master01 kubernetes]# vim /etc/kubernetes/kubelet-conf.yml
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
authentication:
anonymous:
enabled: false
webhook:
cacheTTL: 2m0s
enabled: true
x509:
clientCAFile: /etc/kubernetes/pki/ca.pem
authorization:
mode: Webhook
webhook:
cacheAuthorizedTTL: 5m0s
cacheUnauthorizedTTL: 30s
cgroupDriver: systemd
cgroupsPerQOS: true
clusterDNS:
- 10.96.0.10
clusterDomain: cluster.local
containerLogMaxFiles: 5
containerLogMaxSize: 10Mi
contentType: application/vnd.kubernetes.protobuf
cpuCFSQuota: true
cpuManagerPolicy: none
cpuManagerReconcilePeriod: 10s
enableControllerAttachDetach: true
enableDebuggingHandlers: true
enforceNodeAllocatable:
- pods
eventBurst: 10
eventRecordQPS: 5
evictionHard:
imagefs.available: 15%
memory.available: 100Mi
nodefs.available: 10%
nodefs.inodesFree: 5%
evictionPressureTransitionPeriod: 5m0s
failSwapOn: true
fileCheckFrequency: 20s
hairpinMode: promiscuous-bridge
healthzBindAddress: 127.0.0.1
healthzPort: 10248
httpCheckFrequency: 20s
imageGCHighThresholdPercent: 85
imageGCLowThresholdPercent: 80
imageMinimumGCAge: 2m0s
iptablesDropBit: 15
iptablesMasqueradeBit: 14
kubeAPIBurst: 10
kubeAPIQPS: 5
makeIPTablesUtilChains: true
maxOpenFiles: 1000000
maxPods: 110
nodeStatusUpdateFrequency: 10s
oomScoreAdj: -999
podPidsLimit: -1
registryBurst: 10
registryPullQPS: 5
resolvConf: /etc/resolv.conf
rotateCertificates: true
runtimeRequestTimeout: 2m0s
serializeImagePulls: true
staticPodPath: /etc/kubernetes/manifests
streamingConnectionIdleTimeout: 4h0m0s
syncFrequency: 1m0s
volumeStatsAggPeriod: 1m0s
2.5 启动所有节点kubelet
[root@k8s-master01 ~]# systemctl daemon-reload
[root@k8s-master01 ~]# systemctl enable --now kubelet此时系统日志/var/log/messages显示只有如下信息为正常
Unable to update cni config: no networks found in /etc/cni/net.d
如果有很多报错日志，或者有大量看不懂的报错，说明kubelet的配置有误，需要检查kubelet配置
2.6 查看集群状态
[root@k8s-master01 ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master01 NotReady <none> 36s v1.23.0
k8s-master02 NotReady <none> 35s v1.23.0
k8s-node01 NotReady <none> 36s v1.23.0
k8s-node02 NotReady <none> 35s v1.23.03、安装kube-proxy
# 注意，如果不是高可用集群，192.168.126.200:8443改为master01的地址，8443改为apiserver的端口，默认是6443
3.1 以下操作只在Master01执行
[root@k8s-master01 ~]# cd /opt/k8s-ha-install/
[root@k8s-master01 k8s-ha-install]# kubectl -n kube-system create serviceaccount kube-proxy
serviceaccount/kube-proxy created
[root@k8s-master01 k8s-ha-install]# kubectl create clusterrolebinding system:kube-proxy --clusterrole system:node-proxier --serviceaccount kube-system:kube-proxy
clusterrolebinding.rbac.authorization.k8s.io/system:kube-proxy created
[root@k8s-master01 k8s-ha-install]# SECRET=$(kubectl -n kube-system get sa/kube-proxy --output=jsonpath='{.secrets[0].name}')
[root@k8s-master01 k8s-ha-install]# JWT_TOKEN=$(kubectl -n kube-system get secret/$SECRET --output=jsonpath='{.data.token}' | base64 -d)
[root@k8s-master01 k8s-ha-install]# PKI_DIR=/etc/kubernetes/pki
[root@k8s-master01 k8s-ha-install]# K8S_DIR=/etc/kubernetes
[root@k8s-master01 k8s-ha-install]# kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://192.168.126.200:8443 --kubeconfig=${K8S_DIR}/kube-proxy.kubeconfig
Cluster "kubernetes" set.
[root@k8s-master01 k8s-ha-install]# kubectl config set-credentials kubernetes --token=${JWT_TOKEN} --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
User "kubernetes" set.
[root@k8s-master01 k8s-ha-install]# kubectl config set-context kubernetes --cluster=kubernetes --user=kubernetes --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
Context "kubernetes" created.
[root@k8s-master01 k8s-ha-install]# kubectl config use-context kubernetes --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
Switched to context "kubernetes".
3.2 将kubeconfig发送至其他节点
[root@k8s-master01 k8s-ha-install]# for NODE in k8s-master02; do
scp /etc/kubernetes/kube-proxy.kubeconfig $NODE:/etc/kubernetes/kube-proxy.kubeconfig
done
kube-proxy.kubeconfig 100% 3123 1.1MB/s 00:00
[root@k8s-master01 k8s-ha-install]# for NODE in k8s-node01 k8s-node02; do
scp /etc/kubernetes/kube-proxy.kubeconfig $NODE:/etc/kubernetes/kube-proxy.kubeconfig
scp kube-proxy/kube-proxy.conf $NODE:/etc/kubernetes/kube-proxy.conf
scp kube-proxy/kube-proxy.service $NODE:/usr/lib/systemd/system/kube-proxy.service
done
kube-proxy.kubeconfig 100% 3123 1.3MB/s 00:00
kube-proxy.kubeconfig 100% 3123 325.9KB/s 00:00 3.3 所有节点添加kube-proxy的配置和service文件
[root@k8s-master01 k8s-ha-install]# vim /usr/lib/systemd/system/kube-proxy.service
[Unit]
Description=Kubernetes Kube Proxy
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-proxy \
--config=/etc/kubernetes/kube-proxy.yaml \
--v=2
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
3.4 创建kube-proxy资源
如果更改了集群Pod的网段，需要更改kube-proxy.yaml的clusterCIDR为自己的Pod网段
[root@k8s-master01 k8s-ha-install]# vim /etc/kubernetes/kube-proxy.yaml
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
clientConnection:
acceptContentTypes: ""
burst: 10
contentType: application/vnd.kubernetes.protobuf
kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig
qps: 5
clusterCIDR: 172.16.0.0/12
configSyncPeriod: 15m0s
conntrack:
max: null
maxPerCore: 32768
min: 131072
tcpCloseWaitTimeout: 1h0m0s
tcpEstablishedTimeout: 24h0m0s
enableProfiling: false
healthzBindAddress: 0.0.0.0:10256
hostnameOverride: ""
iptables:
masqueradeAll: false
masqueradeBit: 14
minSyncPeriod: 0s
syncPeriod: 30s
ipvs:
masqueradeAll: true
minSyncPeriod: 5s
scheduler: "rr"
syncPeriod: 30s
kind: KubeProxyConfiguration
metricsBindAddress: 127.0.0.1:10249
mode: "ipvs"
nodePortAddresses: null
oomScoreAdj: -999
portRange: ""
udpIdleTimeout: 250ms3.5 所有节点启动kube-proxy
[root@k8s-master01 k8s-ha-install]# systemctl daemon-reload
[root@k8s-master01 k8s-ha-install]# systemctl enable --now kube-proxy
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-proxy.service to /usr/lib/systemd/system/kube-proxy.service.
[root@k8s-master01 k8s-ha-install]# systemctl status kube-proxy
● kube-proxy.service - Kubernetes Kube Proxy
Loaded: loaded (/usr/lib/systemd/system/kube-proxy.service; enabled; vendor preset: disabled)
Active: active (running) since 四 2022-06-30 17:29:20 CST; 9s ago
Docs: https://github.com/kubernetes/kubernetes
Main PID: 16554 (kube-proxy)
Tasks: 6
Memory: 15.2M
CGroup: /system.slice/kube-proxy.service
└─16554 /usr/local/bin/kube-proxy --config=/etc/kubernetes/kube-proxy.yaml --v=2
6月 30 17:29:21 k8s-master01 kube-proxy[16554]: I0630 17:29:21.506305 16554 config.go:317] "Starting service config controller"
6月 30 17:29:21 k8s-master01 kube-proxy[16554]: I0630 17:29:21.506346 16554 shared_informer.go:240] Waiting for caches to sync for service config
6月 30 17:29:21 k8s-master01 kube-proxy[16554]: I0630 17:29:21.506437 16554 config.go:226] "Starting endpoint slice config controller"
6月 30 17:29:21 k8s-master01 kube-proxy[16554]: I0630 17:29:21.506454 16554 shared_informer.go:240] Waiting for caches to sync for endpoint slice config
6月 30 17:29:21 k8s-master01 kube-proxy[16554]: I0630 17:29:21.533005 16554 service.go:304] "Service updated ports" service="default/kubernetes" portCount=1
6月 30 17:29:21 k8s-master01 kube-proxy[16554]: I0630 17:29:21.606501 16554 shared_informer.go:247] Caches are synced for service config
6月 30 17:29:21 k8s-master01 kube-proxy[16554]: I0630 17:29:21.606618 16554 proxier.go:1000] "Not syncing ipvs rules until Services and Endpoints have been received from master"
6月 30 17:29:21 k8s-master01 kube-proxy[16554]: I0630 17:29:21.606677 16554 proxier.go:1000] "Not syncing ipvs rules until Services and Endpoints have been received from master"
6月 30 17:29:21 k8s-master01 kube-proxy[16554]: I0630 17:29:21.606742 16554 shared_informer.go:247] Caches are synced for endpoint slice config
6月 30 17:29:21 k8s-master01 kube-proxy[16554]: I0630 17:29:21.606839 16554 service.go:419] "Adding new service port" portName="default/kubernetes:https" servicePort="192.168.0.1:443/TCP"
Hint: Some lines were ellipsized, use -l to show in full.
十二、安装Calico
1、Calico介绍
Calico 是一套开源的网络和网络安全方案，用于容器、虚拟机、宿主机之前的网络连接，可以用在kubernetes、OpenShift、DockerEE、OpenStrack等PaaS或IaaS平台上。
2、安装官方推荐版本（推荐）
以下步骤只在master01执行：
2.1 修改calico.yaml的Pod网段
[root@k8s-master01 ~]# cd /opt/k8s-ha-install/calico/
[root@k8s-master01 calico]# ls
calico-etcd.yaml calico.yaml
[root@k8s-master01 calico]# cat calico.yaml
# 更改calico的网段，主要需要将红色部分的网段，改为自己的Pod网段
[root@k8s-master01 calico]# sed -i "s#POD_CIDR#172.16.0.0/12#g" calico.yaml
检查网段是自己的Pod网段:
[root@k8s-master01 calico]# grep "IPV4POOL_CIDR" calico.yaml -A 1
- name: CALICO_IPV4POOL_CIDR
value: "172.16.0.0/12"
2.2 安装Calio
[root@k8s-master01 calico]# kubectl apply -f calico.yaml
configmap/calico-config created
customresourcedefinition.apiextensions.k8s.io/bgpconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/bgppeers.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/blockaffinities.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/caliconodestatuses.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/clusterinformations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/felixconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/globalnetworkpolicies.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/globalnetworksets.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/hostendpoints.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamblocks.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamconfigs.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamhandles.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ippools.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipreservations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/kubecontrollersconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/networkpolicies.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/networksets.crd.projectcalico.org created
clusterrole.rbac.authorization.k8s.io/calico-kube-controllers created
clusterrolebinding.rbac.authorization.k8s.io/calico-kube-controllers created
clusterrole.rbac.authorization.k8s.io/calico-node created
clusterrolebinding.rbac.authorization.k8s.io/calico-node created
service/calico-typha created
deployment.apps/calico-typha created
Warning: policy/v1beta1 PodDisruptionBudget is deprecated in v1.21+, unavailable in v1.25+; use policy/v1 PodDisruptionBudget
poddisruptionbudget.policy/calico-typha created
daemonset.apps/calico-node created
serviceaccount/calico-node created
deployment.apps/calico-kube-controllers created
serviceaccount/calico-kube-controllers created
poddisruptionbudget.policy/calico-kube-controllers created
2.3 查看容器状态
[root@k8s-master01 CoreDNS]# kubectl get po -n kube-system
NAME READY STATUS RESTARTS AGE
calico-kube-controllers-6f6595874c-tvwb4 1/1 Running 1 (108s ago) 9m46s
calico-node-4n5lr 1/1 Running 1 (2m2s ago) 9m46s
calico-node-fwgjv 1/1 Running 0 9m46s
calico-node-gh7t5 1/1 Running 0 9m46s
calico-node-rnnmx 1/1 Running 0 9m46s
calico-typha-6b6cf8cbdf-d6wmj 1/1 Running 0 9m46s
如果容器状态异常可以使用kubectl describe 或者kubectl logs查看容器的日志：
[root@k8s-master01 CoreDNS]# kubectl describe po calico-node-4n5lr -n kube-system十三、安装CoreDNS
1、CoreDNS介绍
1.1 概念
service发现是k8s中的一个重要机制，其基本功能为：在集群内通过服务名对服务进行访问，即需要完成从服务名到ClusterIP的解析。
k8s主要有两种service发现机制
- 环境变量
- DNS
没有DNS服务的时候，k8s会采用环境变量的形式，但一旦有多个service，环境变量会变复杂，为解决该问题，我们使用DNS服务。
1.2 逻辑
2、安装官方推荐版本（推荐）
[root@k8s-master01 ~]# cd /opt/k8s-ha-install/CoreDNS/
[root@k8s-master01 CoreDNS]# ls
coredns.yaml
[root@k8s-master01 CoreDNS]# vim coredns.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: coredns
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:coredns
rules:
- apiGroups:
- ""
resources:
- endpoints
- services
- pods
- namespaces
verbs:
- list
- watch
- apiGroups:
- discovery.k8s.io
resources:
- endpointslices
verbs:
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:coredns
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:coredns
subjects:
- kind: ServiceAccount
name: coredns
namespace: kube-system
---
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns
namespace: kube-system
data:
Corefile: |
.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
fallthrough in-addr.arpa ip6.arpa
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: coredns
namespace: kube-system
labels:
k8s-app: kube-dns
kubernetes.io/name: "CoreDNS"
spec:
# replicas: not specified here:
# 1. Default is 1.
# 2. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 1
selector:
matchLabels:
k8s-app: kube-dns
template:
metadata:
labels:
k8s-app: kube-dns
spec:
priorityClassName: system-cluster-critical
serviceAccountName: coredns
tolerations:
- key: "CriticalAddonsOnly"
operator: "Exists"
nodeSelector:
kubernetes.io/os: linux
affinity:
podAntiAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 100
podAffinityTerm:
labelSelector:
matchExpressions:
- key: k8s-app
operator: In
values: ["kube-dns"]
topologyKey: kubernetes.io/hostname
containers:
- name: coredns
image: registry.cn-beijing.aliyuncs.com/dotbalo/coredns:1.8.6
imagePullPolicy: IfNotPresent
resources:
limits:
memory: 170Mi
requests:
cpu: 100m
memory: 70Mi
args: [ "-conf", "/etc/coredns/Corefile" ]
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
readOnly: true
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
- containerPort: 9153
name: metrics
protocol: TCP
securityContext:
allowPrivilegeEscalation: false
capabilities:
add:
- NET_BIND_SERVICE
drop:
- all
readOnlyRootFilesystem: true
livenessProbe:
httpGet:
path: /health
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
readinessProbe:
httpGet:
path: /ready
port: 8181
scheme: HTTP
dnsPolicy: Default
volumes:
- name: config-volume
configMap:
name: coredns
items:
- key: Corefile
path: Corefile
---
apiVersion: v1
kind: Service
metadata:
name: kube-dns
namespace: kube-system
annotations:
prometheus.io/port: "9153"
prometheus.io/scrape: "true"
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
kubernetes.io/name: "CoreDNS"
spec:
selector:
k8s-app: kube-dns
clusterIP: 10.96.0.10
ports:
- name: dns
port: 53
protocol: UDP
- name: dns-tcp
port: 53
protocol: TCP
- name: metrics
port: 9153
protocol: TCP2.1 将coredns的serviceIP改成k8s service网段的第十个IP
[root@k8s-master01 CoreDNS]# kubectl get svc | grep kubernetes | awk '{print $3}'
10.96.0.1
[root@k8s-master01 CoreDNS]# COREDNS_SERVICE_IP=`kubectl get svc | grep kubernetes | awk '{print $3}'`0
[root@k8s-master01 CoreDNS]# sed -i "s#KUBEDNS_SERVICE_IP#${COREDNS_SERVICE_IP}#g" coredns.yaml2.2 安装coredns
[root@k8s-master01 CoreDNS]# kubectl create -f coredns.yaml
serviceaccount/coredns created
clusterrole.rbac.authorization.k8s.io/system:coredns created
clusterrolebinding.rbac.authorization.k8s.io/system:coredns created
configmap/coredns created
deployment.apps/coredns created
service/kube-dns created
[root@k8s-master01 CoreDNS]# kubectl get po -n kube-system
NAME READY STATUS RESTARTS AGE
calico-kube-controllers-6f6595874c-tvwb4 1/1 Running 1 (4m1s ago) 11m
calico-node-4n5lr 1/1 Running 1 (4m15s ago) 11m
calico-node-fwgjv 1/1 Running 0 11m
calico-node-gh7t5 1/1 Running 0 11m
calico-node-rnnmx 1/1 Running 0 11m
calico-typha-6b6cf8cbdf-d6wmj 1/1 Running 0 11m
coredns-5db5696c7-cvbd5 1/1 Running 0 31s3、安装最新版CoreDNS
COREDNS_SERVICE_IP=`kubectl get svc | grep kubernetes | awk '{print $3}'`0
git clone https://github.com/coredns/deployment.git
cd deployment/kubernetes
# ./deploy.sh -s -i ${COREDNS_SERVICE_IP} | kubectl apply -f -
serviceaccount/coredns created
clusterrole.rbac.authorization.k8s.io/system:coredns created
clusterrolebinding.rbac.authorization.k8s.io/system:coredns created
configmap/coredns created
deployment.apps/coredns created
service/kube-dns created
查看状态
# kubectl get po -n kube-system -l k8s-app=kube-dns
NAME READY STATUS RESTARTS AGE
coredns-85b4878f78-h29kh 1/1 Running 0 8h十四、安装Metrics Server
在新版的Kubernetes中系统资源的采集均使用Metrics-server，可以通过Metrics采集节点和Pod的内存、磁盘、CPU和网络的使用率。
1、安装metrics server
[root@k8s-master01 ~]# cd /opt/k8s-ha-install/metrics-server/
[root@k8s-master01 metrics-server]# ls
comp.yaml
[root@k8s-master01 metrics-server]# kubectl create -f .
serviceaccount/metrics-server created
clusterrole.rbac.authorization.k8s.io/system:aggregated-metrics-reader created
clusterrole.rbac.authorization.k8s.io/system:metrics-server created
rolebinding.rbac.authorization.k8s.io/metrics-server-auth-reader created
clusterrolebinding.rbac.authorization.k8s.io/metrics-server:system:auth-delegator created
clusterrolebinding.rbac.authorization.k8s.io/system:metrics-server created
service/metrics-server created
deployment.apps/metrics-server created
apiservice.apiregistration.k8s.io/v1beta1.metrics.k8s.io created2、等待metrics server启动然后查看状态
[root@k8s-master01 metrics-server]# kubectl get po -n kube-system
NAME READY STATUS RESTARTS AGE
calico-kube-controllers-6f6595874c-tvwb4 1/1 Running 1 (6m31s ago) 14m
calico-node-4n5lr 1/1 Running 1 (6m45s ago) 14m
calico-node-fwgjv 1/1 Running 0 14m
calico-node-gh7t5 1/1 Running 0 14m
calico-node-rnnmx 1/1 Running 0 14m
calico-typha-6b6cf8cbdf-d6wmj 1/1 Running 0 14m
coredns-5db5696c7-cvbd5 1/1 Running 0 3m1s
metrics-server-6bf7dcd649-9qbh8 1/1 Running 0 72s
[root@k8s-master01 metrics-server]# kubectl top node
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY%
k8s-master01 264m 13% 1814Mi 47%
k8s-master02 291m 14% 1250Mi 44%
k8s-node01 221m 11% 747Mi 39%
k8s-node02 151m 7% 727Mi 38% 十五、安装dashboard
Dashboard用于展示集群中的各类资源，同时也可以通过Dashboard实时查看Pod的日志和在容器中执行一些命令等。
1、安装指定版本dashboard
[root@k8s-master01 ~]# cd /opt/k8s-ha-install/dashboard/
[root@k8s-master01 dashboard]# ls
dashboard-user.yaml dashboard.yaml
[root@k8s-master01 dashboard]# kubectl create -f .
serviceaccount/admin-user created
clusterrolebinding.rbac.authorization.k8s.io/admin-user created
namespace/kubernetes-dashboard created
serviceaccount/kubernetes-dashboard created
service/kubernetes-dashboard created
secret/kubernetes-dashboard-certs created
secret/kubernetes-dashboard-csrf created
secret/kubernetes-dashboard-key-holder created
configmap/kubernetes-dashboard-settings created
role.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrole.rbac.authorization.k8s.io/kubernetes-dashboard created
rolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
deployment.apps/kubernetes-dashboard created
service/dashboard-metrics-scraper created
deployment.apps/dashboard-metrics-scraper created
[root@k8s-master01 dashboard]# kubectl get po -n kubernetes-dashboard
NAME READY STATUS RESTARTS AGE
dashboard-metrics-scraper-7fcdff5f4c-95xs5 1/1 Running 0 2m3s
kubernetes-dashboard-85f59f8ff7-9zg49 1/1 Running 0 2m3s2、安装最新版
官方GitHub地址：GitHub - kubernetes/dashboard: General-purpose web UI for Kubernetes clusters
可以在官方dashboard查看到最新版dashboard
kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.3/aio/deploy/recommended.yaml
地址改为页面上最新的地址
创建管理员用户vim admin.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: admin-user
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: admin-user
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: cluster-admin
subjects:
- kind: ServiceAccount
name: admin-user
namespace: kube-system
kubectl apply -f admin.yaml -n kube-system3、登录dashboard
3.1 在谷歌浏览器（Chrome）启动文件中加入启动参数
用于解决无法访问Dashboard的问题：
--test-type --ignore-certificate-errors
3.2 更改dashboard的svc为NodePort
kubectl edit svc kubernetes-dashboard -n kubernetes-dashboard
3.3 查看端口号
[root@k8s-master01 dashboard]# kubectl get svc -n kubernetes-dashboard
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
dashboard-metrics-scraper ClusterIP 10.96.210.85 <none> 8000/TCP 100s
kubernetes-dashboard NodePort 10.96.209.72 <none> 443:30092/TCP 100s3.4 访问Dashboard
根据自己的实例端口号，通过任意安装了kube-proxy的宿主机的IP+端口即可访问到dashboard：
访问Dashboard：https://192.168.126.129:30092（请更改30092为自己的端口），选择登录方式为令牌（即token方式）：
3.5 查看token值
[root@k8s-master01 dashboard]# kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk '{print $1}')
Name: admin-user-token-g86cv
Namespace: kube-system
Labels: <none>
Annotations: kubernetes.io/service-account.name: admin-user
kubernetes.io/service-account.uid: d89a300e-160a-4396-b710-5c61ab553e80
Type: kubernetes.io/service-account-token
Data
====
ca.crt: 1411 bytes
namespace: 11 bytes
token: eyJhbGciOiJSUzI1NiIsImtpZCI6ImliOWVkSEJfUS0xWkdsaFhWZnhFQWNaeG0wc0x5MWhsZEJCRlFUT2FDRXcifQ.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJrdW
JlLXN5c3RlbSIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VjcmV0Lm5hbWUiOiJhZG1pbi11c2VyLXRva2VuLWc4NmN2Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZXJ2aWNlLWFjY291bnQubmFtZSI6ImFkbWluLXVzZXIiLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC51aWQiOiJkODlhMzAwZS0xNjBhLTQzOTYtYjcxMC01YzYxYWI1NTNlODAiLCJzdWIiOiJzeXN0ZW06c2VydmljZWFjY291bnQ6a3ViZS1zeXN0ZW06YWRtaW4tdXNlciJ9.plqO3OfA9Vh7S-ZPO9LlBcbgSFOSLo5eKUvEtt9eFyqmP2-Ne0sbz6HWtZMpAhUhaRzKav9pDHQaiS4YvgKNpYfzNX9xFRhGZ-NXm_CxArj5aQDqRwT0Gb72NzRyVnyfIx4i6paj4_x0uH-EeSZ-I19OSrLqEq4Pfo-NRPdr9I4QMxvLI3fVGRdkOU0aYqcdMuzsAV5yKtbXnlAibeYOh3d0ANEzqnWhz33jNU_qYFL8DxN-_EWE7_Onf0BkJUyuMkWVk0OhKBr5C_8M0y3aSjBt9lYKgXwCsKhp7kjCSmf3baWGidk2-zNlRLO_Zg1FBWeXLb4FAVk0v9fR3ygm-w3.6 将token值输入到令牌后，单击登录即可访问Dashboard
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