K8S1.20二进制部署
1.20 二进制部署环境192.168.202.191 sxy-k8sB-master01 # 2C2G 40G192.168.202.192 sxy-k8sB-master02 # 2C2G 40G192.168.202.193sxy-k8sB-master03 # 2C2G 40G# VIP 虚IP不占用机器资源192.168.202.199 k8s-master-lb ##如果不是高可用集群
·
1.20 二进制部署
环境
192.168.202.191 sxy-k8sB-master01 # 2C2G 40G
192.168.202.192 sxy-k8sB-master02 # 2C2G 40G
192.168.202.193sxy-k8sB-master03 # 2C2G 40G
# VIP 虚IP不占用机器资源
192.168.202.199 k8s-master-lb #
#如果不是高可用集群，该IP为Master01的IP
192.168.202.194 sxy-k8sB-node01 # 2C2G 40G
192.168.202.195 sxy-k8sB-node02 # 2C2G 40G
K8s Service网段：17.96.0.0/12
K8s Pod网段：174.16.0.0/12
宿主机网段、K8s Service网段、Pod网段不能重复
配置所有节点hosts文件
[root@sxy-k8sB-master01 ~]# vim /etc/hosts
192.168.202.191 sxy-k8sB-master01
192.168.202.192 sxy-k8sB-master02
192.168.202.193 sxy-k8sB-master03
192.168.202.199 k8s-master-lb
192.168.202.194 sxy-k8sB-node01
192.168.202.195 sxy-k8sB-node02
更换yum源
[root@sxy-k8sB-master01 ~]# curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
[root@sxy-k8sB-master01 ~]# yum install -y yum-utils device-mapper-persistent-data lvm2
[root@sxy-k8sB-master01 ~]# yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
[root@sxy-k8sB-master01 ~]# sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
必备工具安装
[root@sxy-k8sB-master01 ~]# yum install wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 git -y
所有节点关闭firewalld 、dnsmasq、selinux(CentOS7需要关闭NetworkManager，CentOS8不需要)
[root@sxy-k8sB-master01 ~]# systemctl disable --now firewalld
[root@sxy-k8sB-master01 ~]# systemctl disable --now dnsmasq
Failed to execute operation: No such file or directory
[root@sxy-k8sB-master01 ~]# systemctl disable --now NetworkManager
Removed symlink /etc/systemd/system/multi-user.target.wants/NetworkManager.service.
Removed symlink /etc/systemd/system/dbus-org.freedesktop.NetworkManager.service.
Removed symlink /etc/systemd/system/network-online.target.wants/NetworkManager-wait-online.service.
Removed symlink /etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service.
[root@sxy-k8sB-master01 ~]# setenforce 0
setenforce: SELinux is disabled
[root@sxy-k8sB-master01 ~]# sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/sysconfig/selinux
[root@sxy-k8sB-master01 ~]# sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config
关闭swap分区，fstab注释swap
[root@sxy-k8sB-master01 ~]# swapoff -a && sysctl -w vm.swappiness=0
vm.swappiness = 0
[root@sxy-k8sB-master01 ~]# sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab
所有节点同步时间
#安装ntpdate
[root@sxy-k8sB-master01 ~]# rpm -ivh http://mirrors.wlnmp.com/centos/wlnmp-release-centos.noarch.rpm
Retrieving http://mirrors.wlnmp.com/centos/wlnmp-release-centos.noarch.rpm
Preparing... ################################# [100%]
Updating / installing...
1:wlnmp-release-centos-2-1 ################################# [100%]
[root@sxy-k8sB-master01 ~]# yum install ntpdate -y
[root@sxy-k8sB-master01 ~]# ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
[root@sxy-k8sB-master01 ~]# echo 'Asia/Shanghai' >/etc/timezone
[root@sxy-k8sB-master01 ~]# ntpdate time2.aliyun.com
# 加入到crontab
*/5 * * * * /usr/sbin/ntpdate time2.aliyun.com
所有节点配置limit
[root@sxy-k8sB-master01 ~]# ulimit -SHn 65535
[root@sxy-k8sB-master01 ~]# 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
免密登录
# Master01节点免密钥登录其他节点，安装过程中生成配置文件和证书均在Master01上操作，集群管理也在Master01上操作，阿里云或者AWS上需要单独一台kubectl服务器。密钥配置如下：
[root@sxy-k8sB-master01 ~]# ssh-keygen -t rsa
[root@sxy-k8sB-master01 ~]# for i in sxy-k8sB-master01 sxy-k8sB-master02sxy-k8sB-master03 sxy-k8sB-node01 sxy-k8sB-node02;do ssh-copy-id -i .ssh/id_rsa.pub $i;done
Master01下载安装文件
[root@sxy-k8sB-master01 ~]# cd /root/ ; git clone https://github.com/dotbalo/k8s-ha-install.git
[root@sxy-k8sB-master01 ~]# cd /root/ ; git clone https://gitee.com/dukuan/k8s-ha-install.git
#有的系统不支持 去掉--exclude=kernel*
yum update -y --exclude=kernel* && reboot
内核升级
[root@sxy-k8sB-master01 ~]# cd /root/
[root@sxy-k8sB-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@sxy-k8sB-master01 ~]# wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-4.19.12-1.el7.elrepo.x86_64.rpm
从master01节点传到其他节点：
[root@sxy-k8sB-master01 ~]# for i in sxy-k8sB-master02 sxy-k8sB-master03 sxy-k8sB-node01 sxy-k8sB-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 $i:/root/ ; done
所有节点安装内核
[root@sxy-k8sB-master01 ~]# cd /root && yum localinstall -y kernel-ml*
所有节点更改内核启动顺序
[root@sxy-k8sB-master01 ~]# grub2-set-default 0 && grub2-mkconfig -o /etc/grub2.cfg
[root@sxy-k8sB-master01 ~]# grubby --args="user_namespace.enable=1" --update-kernel="$(grubby --default-kernel)"
#检查默认内核是不是4.19
[root@sxy-k8sB-master01 ~]# grubby --default-kernel
/boot/vmlinuz-4.19.12-1.el7.elrepo.x86_6
所有节点重启，然后检查内核是不是4.19
[root@sxy-k8sB-master01 ~]# uname -a
Linux sxy-k8sB-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/Linux
所有节点安装ipvsadm：
[root@sxy-k8sB-master01 ~]# yum install ipvsadm ipset sysstat conntrack libseccomp -y
[root@sxy-k8sB-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
##重启
[root@sxy-k8sB-master01 ~]# systemctl enable --now systemd-modules-load.service
#检查是否加载：
[root@sxy-k8sB-master01 ~]# lsmod | grep -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
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@sxy-k8sB-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
> 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
[root@sxy-k8sB-master01 ~]# sysctl --system
#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@sxy-k8sB-master01 ~]# lsmod | grep --color=auto -e ip_vs -e nf_conntrack
Docker安装
#所有节点
[root@sxy-k8sB-master01 ~]# yum install docker-ce-19.03.* -y
#由于新版kubelet建议使用systemd，所以可以把docker的CgroupDriver改成systemd
[root@sxy-k8sB-master01 ~]# mkdir /etc/docker
[root@sxy-k8sB-master01 ~]# cat > /etc/docker/daemon.json <<EOF
> {
> "exec-opts": ["native.cgroupdriver=systemd"]
> }
> EOF
#所有节点设置开机自启动Docker：
[root@sxy-k8sB-master01 ~]# systemctl daemon-reload && systemctl enable --now docker
K8s及etcd安装
###选择最新版下载
[root@sxy-k8sB-node02 ~]# wget https://dl.k8s.io/v1.20.11/kubernetes-server-linux-amd64.tar.gz
#解压kubernetes安装文件
[root@sxy-k8sB-master01 ~]# tar -xf kubernetes-server-linux-amd64.tar.gz --strip-components=3 -C /usr/local/bin
#下载etcd安装包
[root@sxy-k8sB-master01 ~]# wget https://github.com/etcd-io/etcd/releases/download/v3.4.13/etcd-v3.4.13-linux-amd64.tar.gz
#解压ETCD文件
[root@sxy-k8sB-master01 ~]# tar -zxvf etcd-v3.4.13-linux-amd64.tar.gz --strip-components=1 -C /usr/local/bin etcd-v3.4.13-linux-amd64/etcd{,ctl}
#组件发到其他节点
[root@sxy-k8sB-master01 ~]# MasterNodes='sxy-k8sB-master02s^C-k8sB-master03'
[root@sxy-k8sB-master01 ~]# MasterNodes='sxy-k8sB-master02 sxy-k8sB-master03'
[root@sxy-k8sB-master01 ~]# WorkNodes='sxy-k8sB-node01 sxy-k8sB-node02'
[root@sxy-k8sB-master01 ~]# 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/bin/etcd* $NODE:/usr/local/bin/; done
所有节点创建目录
[root@sxy-k8sB-master01 ~]# mkdir -p /opt/cni/bin
#Master01切换到1.20.x分支（其他版本可以切换到其他分支）
[root@sxy-k8sB-master01 ~]# cd k8s-ha-install && git checkout manual-installation-v1.20.x
生成证书
Master01下载生成证书工具（下载不成功可以去百度网盘）
wget "https://pkg.cfssl.org/R1.2/cfssl_linux-amd64" -O /usr/local/bin/cfssl
wget "https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64" -O /usr/local/bin/cfssljson
chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljso
etcd证书
所有Master节点创建etcd证书目录
[root@sxy-k8sB-master01 ~]# mkdir /etc/etcd/ssl -p
所有节点创建kubernetes相关目录
[root@sxy-k8sB-master01 ~]# mkdir -p /etc/kubernetes/pki
Master01节点生成etcd证书
[root@sxy-k8sB-master01 ~]# cd /root/k8s-ha-install/pki
[root@sxy-k8sB-master01 pki]# cfssl gencert -initca etcd-ca-csr.json | cfssljson -bare /etc/etcd/ssl/etcd-ca
2021/09/23 13:38:07 [INFO] generating a new CA key and certificate from CSR
2021/09/23 13:38:07 [INFO] generate received request
2021/09/23 13:38:07 [INFO] received CSR
2021/09/23 13:38:07 [INFO] generating key: rsa-2048
2021/09/23 13:38:08 [INFO] encoded CSR
2021/09/23 13:38:08 [INFO] signed certificate with serial number 714578536162361357839119151799816525922708582947
[root@sxy-k8sB-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,sxy-k8sB-master01,sxy-k8sB-master02,k8s-master03,192.168.202.191,192.168.202.192,192.168.202.193 \
> -profile=kubernetes \
> etcd-csr.json | cfssljson -bare /etc/etcd/ssl/etcd
2021/09/23 13:38:55 [INFO] generate received request
2021/09/23 13:38:55 [INFO] received CSR
2021/09/23 13:38:55 [INFO] generating key: rsa-2048
2021/09/23 13:38:55 [INFO] encoded CSR
2021/09/23 13:38:55 [INFO] signed certificate with serial number 592257562954525415964783139049002381804207134369
将证书复制到其他节点
[root@sxy-k8sB-master01 pki]# MasterNodes='sxy-k8sB-master02 sxy-k8sB-master03'
[root@sxy-k8sB-master01 pki]# WorkNodes='sxy-k8sB-node01 sxy-k8sB-node02'
[root@sxy-k8sB-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
> done
etcd-ca-key.pem 100% 1675 3.0MB/s 00:00
etcd-ca.pem 100% 1367 2.3MB/s 00:00
etcd-key.pem 100% 1675 3.0MB/s 00:00
etcd.pem 100% 1521 3.1MB/s 00:00
etcd-ca-key.pem 100% 1675 3.6MB/s 00:00
etcd-ca.pem 100% 1367 3.5MB/s 00:00
etcd-key.pem 100% 1675 3.5MB/s 00:00
etcd.pem 100% 1521 3.3MB/s 00:00
k8s组件证书
Master01生成kubernetes证书
[root@sxy-k8sB-master01 pki]# cd /root/k8s-ha-install/pki
[root@sxy-k8sB-master01 pki]# cfssl gencert -initca ca-csr.json | cfssljson -bare /etc/kubernetes/pki/ca
2021/09/23 13:42:58 [INFO] generating a new CA key and certificate from CSR
2021/09/23 13:42:58 [INFO] generate received request
2021/09/23 13:42:58 [INFO] received CSR
2021/09/23 13:42:58 [INFO] generating key: rsa-2048
2021/09/23 13:42:59 [INFO] encoded CSR
2021/09/23 13:42:59 [INFO] signed certificate with serial number 625830786720910836753704089341680486695336236679
### # 17.96.0.0是k8s service的网段，如果说需要更改k8s service网段，那就需要更改17.96.0.1，
[root@sxy-k8sB-master01 pki]# cfssl gencert -ca=/etc/kubernetes/pki/ca.pem -ca-key=/etc/kubernetes/pki/ca-key.pem -config=ca-config.json -hostname=17.96.0.1,192.168.202.199,127.0.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,192.168.202.191,192.168.202.192,192.168.202.193 -profile=kubernetes apiserver-csr.json | cfssljson -bare /etc/kubernetes/pki/apiserver
2021/09/23 13:57:50 [INFO] generate received request
2021/09/23 13:57:50 [INFO] received CSR
2021/09/23 13:57:50 [INFO] generating key: rsa-2048
2021/09/23 13:57:50 [INFO] encoded CSR
2021/09/23 13:57:50 [INFO] signed certificate with serial number 506413729023178271676858922057232015366343570915
## 生成apiserver的聚合证书。Requestheader-client-xxx requestheader-allowwd-xxx:aggerator
[root@sxy-k8sB-master01 pki]# cfssl gencert -initca front-proxy-ca-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-ca
2021/09/23 13:58:59 [INFO] generating a new CA key and certificate from CSR
2021/09/23 13:58:59 [INFO] generate received request
2021/09/23 13:58:59 [INFO] received CSR
2021/09/23 13:58:59 [INFO] generating key: rsa-2048
2021/09/23 13:59:00 [INFO] encoded CSR
2021/09/23 13:59:00 [INFO] signed certificate with serial number 46639735014959388897535952083440340716927249971
[root@sxy-k8sB-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
## 返回结果（忽略警告）
2021/09/23 13:59:14 [INFO] generate received request
2021/09/23 13:59:14 [INFO] received CSR
2021/09/23 13:59:14 [INFO] generating key: rsa-2048
2021/09/23 13:59:15 [INFO] encoded CSR
2021/09/23 13:59:15 [INFO] signed certificate with serial number 490712340124965306468828978424251937792451861594
2021/09/23 13:59:15 [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").
# 生成controller-manage的证书
[root@sxy-k8sB-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
2021/09/23 14:00:10 [INFO] generate received request
2021/09/23 14:00:10 [INFO] received CSR
2021/09/23 14:00:10 [INFO] generating key: rsa-2048
2021/09/23 14:00:10 [INFO] encoded CSR
2021/09/23 14:00:10 [INFO] signed certificate with serial number 441935209979025288307201385186500320121348312730
2021/09/23 14:00:10 [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，192.168.202.199:8443改为master01的地址，8443改为apiserver的端口，默认是6443
# set-cluster：设置一个集群项，
[root@sxy-k8sB-master01 pki]# kubectl config set-cluster kubernetes \
> --certificate-authority=/etc/kubernetes/pki/ca.pem \
> --embed-certs=true \
> --server=https://192.168.202.199:8443 \
> --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
Cluster "kubernetes" set.
# 设置一个环境项，一个上下文
[root@sxy-k8sB-master01 pki]# kubectl config set-cluster kubernetes \
> --certificate-authority=/etc/kubernetes/pki/ca.pem \
> --embed-certs=true \
> --server=https://192.168.202.199:8443 \
> --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
Cluster "kubernetes" set.
[root@sxy-k8sB-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.
# set-credentials 设置一个用户项
[root@sxy-k8sB-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.
# 使用某个环境当做默认环境
[root@sxy-k8sB-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@sxy-k8sB-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
2021/09/23 14:02:47 [INFO] generate received request
2021/09/23 14:02:47 [INFO] received CSR
2021/09/23 14:02:47 [INFO] generating key: rsa-2048
2021/09/23 14:02:48 [INFO] encoded CSR
2021/09/23 14:02:48 [INFO] signed certificate with serial number 684259820459008284308705643740626301308590336050
2021/09/23 14:02:48 [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，192.168.202.199:8443改为master01的地址，8443改为apiserver的端口，默认是6443
[root@sxy-k8sB-master01 pki]# kubectl config set-cluster kubernetes \
> --certificate-authority=/etc/kubernetes/pki/ca.pem \
> --embed-certs=true \
> --server=https://192.168.202.199:8443 \
> --kubeconfig=/etc/kubernetes/scheduler.kubeconfig
Cluster "kubernetes" set.
[root@sxy-k8sB-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@sxy-k8sB-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@sxy-k8sB-master01 pki]# kubectl config use-context system:kube-scheduler@kubernetes \
> --kubeconfig=/etc/kubernetes/scheduler.kubeconfig
Switched to context "system:kube-scheduler@kubernetes".
[root@sxy-k8sB-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
2021/09/23 14:04:38 [INFO] generate received request
2021/09/23 14:04:38 [INFO] received CSR
2021/09/23 14:04:38 [INFO] generating key: rsa-2048
2021/09/23 14:04:39 [INFO] encoded CSR
2021/09/23 14:04:39 [INFO] signed certificate with serial number 720511964860218414200000140750748199449157885028
2021/09/23 14:04:39 [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，192.168.202.199:8443改为master01的地址，8443改为apiserver的端口，默认是6443
[root@sxy-k8sB-master01 pki]# kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://192.168.202.199:8443 --kubeconfig=/etc/kubernetes/admin.kubeconfig
Cluster "kubernetes" set.
[root@sxy-k8sB-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@sxy-k8sB-master01 pki]# kubectl config set-context kubernetes-admin@kubernetes --cluster=kubernetes --user=kubernetes-admin --kubeconfig=/etc/kubernetes/admin.kubeconfig
[root@sxy-k8sB-master01 pki]# kubectl config use-context kubernetes-admin@kubernetes --kubeconfig=/etc/kubernetes/admin.kubeconfig
Switched to context "kubernetes-admin@kubernetes".
# 创建ServiceAccount Key secret
[root@sxy-k8sB-master01 pki]# openssl genrsa -out /etc/kubernetes/pki/sa.key 2048
Generating RSA private key, 2048 bit long modulus
................+++
......................................+++
e is 65537 (0x10001)
[root@sxy-k8sB-master01 pki]# openssl rsa -in /etc/kubernetes/pki/sa.key -pubout -out /etc/kubernetes/pki/sa.pub
writing RSA key
发送证书至其他节点
[root@sxy-k8sB-master01 pki]# for NODE in sxy-k8sB-master02 sxy-k8sB-master03; do
> for FILE in $(ls /etc/kubernetes/pki | grep -v etcd);
> do
> scp /etc/kubernetes/pki/${FILE} $NODE:/etc/kubernetes/pki/${FILE};
> done;
[root@sxy-k8sB-master01 pki]# for FILE in admin.kubeconfig controller-manager.kubeconfig scheduler.kubeconfig;
> do
> scp /etc/kubernetes/${FILE} $NODE:/etc/kubernetes/${FILE};
> done;
admin.kubeconfig 100% 6451 13.3MB/s 00:00
controller-manager.kubeconfig 100% 6587 13.4MB/s 00:00
scheduler.kubeconfig 100% 6515 12.0MB/s 00:00
查看证书文件
[root@sxy-k8sB-master01 pki]# ls /etc/kubernetes/pki/
admin.csr apiserver-key.pem ca.pem front-proxy-ca.csr front-proxy-client-key.pem scheduler.csr
admin-key.pem apiserver.pem controller-manager.csr front-proxy-ca-key.pem front-proxy-client.pem scheduler-key.pem
admin.pem ca.csr controller-manager-key.pem front-proxy-ca.pem sa.key scheduler.pem
apiserver.csr ca-key.pem controller-manager.pem front-proxy-client.csr sa.pub
[root@sxy-k8sB-master01 pki]# ls /etc/kubernetes/pki/ |wc -l
23
Kubernetes系统组件配置
Etcd配置
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
Master01
[root@sxy-k8sB-master01 pki]# vim /etc/etcd/etcd.config.yml
name: 'sxy-k8sB-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://192.168.202.191:2380'
listen-client-urls: 'https://192.168.202.191:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.202.191:2380'
advertise-client-urls: 'https://192.168.202.191:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'sxy-k8sB-master01=https://192.168.202.191:2380,sxy-k8sB-master02=https://192.168.202.192:2380,k8s-master03=https://192.168.202.193:2380'
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
Master02
[root@sxy-k8sB-master02 ~]# vim /etc/etcd/etcd.config.yml
name: 'sxy-k8sB-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://192.168.202.192:2380'
listen-client-urls: 'https://192.168.202.192:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.202.192:2380'
advertise-client-urls: 'https://192.168.202.192:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'sxy-k8sB-master01=https://192.168.202.191:2380,sxy-k8sB-master02=https://192.168.202.192:2380,k8s-master03=https://192.168.202.193:2380'
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
Master03
[root@sxy-k8sB-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://192.168.202.193:2380'
listen-client-urls: 'https://192.168.202.193:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.202.193:2380'
advertise-client-urls: 'https://192.168.202.193:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'sxy-k8sB-master01=https://192.168.202.191:2380,sxy-k8sB-master02=https://192.168.202.192:2380,k8s-master03=https://192.168.202.193:2380'
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
创建Service
所有Master节点创建etcd service并启动
[root@sxy-k8sB-master01 pki]# 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
所有Master节点创建etcd的证书目录
[root@sxy-k8sB-master01 pki]# mkdir /etc/kubernetes/pki/etcd
[root@sxy-k8sB-master01 pki]# ln -s /etc/etcd/ssl/* /etc/kubernetes/pki/etcd/
[root@sxy-k8sB-master01 pki]# systemctl daemon-reload
[root@sxy-k8sB-master01 pki]# 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.
查看excd状态
[root@sxy-k8sB-master01 pki]# export ETCDCTL_API=3
[root@sxy-k8sB-master01 pki]# etcdctl --endpoints="192.168.202.193:2379,192.168.202.192:2379,192.168.202.191:2379" --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 |
+----------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| 192.168.202.193:2379 | ed09934c14e08c4 | 3.4.13 | 20 kB | false | false | 2 | 8 | 8 | |
| 192.168.202.192:2379 | 9ba14ba2ca4d695c | 3.4.13 | 20 kB | true | false | 2 | 8 | 8 | |
| 192.168.202.191:2379 | 8119ddd527b15244 | 3.4.13 | 20 kB | false | false | 2 | 8 | 8 | |
+----------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
高可用配置
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。
Slb -> haproxy -> apiserver
所有Master节点安装keepalived和haproxy
[root@sxy-k8sB-master01 pki]# yum install keepalived haproxy -y
所有Master配置HAProxy，配置一样
[root@sxy-k8sB-master01 pki]# 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 sxy-k8sB-master01 192.168.202.191:6443 check
server sxy-k8sB-master02 192.168.202.192:6443 check
serversxy-k8sB-master03 192.168.202.193:6443 check
Master01 keepalived
所有Master节点配置KeepAlived，配置不一样，注意区分 [root@sxy-k8sB-master01 pki]# vim /etc/keepalived/keepalived.conf ，注意每个节点的IP和网卡（interface参数）
[root@sxy-k8sB-master01 pki]# 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 ens160
mcast_src_ip 192.168.202.191
virtual_router_id 51
priority 101
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.202.199
}
track_script {
chk_apiserver
} }
master02
[root@sxy-k8sB-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 BACKUP
interface ens160
mcast_src_ip 192.168.202.192
virtual_router_id 51
priority 100
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.202.199
}
track_script {
chk_apiserver
} }
master03
[root@sxy-k8sB-master03 ~]# 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 BACKUP
interface ens160
mcast_src_ip 192.168.202.193
virtual_router_id 51
priority 100
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.202.199
}
track_script {
chk_apiserver
} }
健康检查配置
所有master节点
[root@sxy-k8sB-master01 pki]# 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
[root@sxy-k8sB-master01 pki]# chmod +x /etc/keepalived/check_apiserver.sh
所有master节点启动haproxy和keepalived
[root@sxy-k8sB-master01 pki]# systemctl daemon-reload
[root@sxy-k8sB-master01 pki]# systemctl enable --now haproxy
Created symlink from /etc/systemd/system/multi-user.target.wants/haproxy.service to /usr/lib/systemd/system/haproxy.service.
[root@sxy-k8sB-master01 pki]# systemctl enable --now keepalived
Created symlink from /etc/systemd/system/multi-user.target.wants/keepalived.service to /usr/lib/systemd/system/keepalived.service.
VIP测试
[root@sxy-k8sB-master01 ~]# ping 192.168.202.199
PING 192.168.202.199 (192.168.202.199) 56(84) bytes of data.
64 bytes from 192.168.202.199: icmp_seq=1 ttl=64 time=179 ms
64 bytes from 192.168.202.199: icmp_seq=2 ttl=64 time=0.207 ms
64 bytes from 192.168.202.199: icmp_seq=3 ttl=64 time=0.224 ms
如果ping不通且telnet没有出现 ^]，则认为VIP不可以，不可在继续往下执行，需要排查keepalived的问题，比如防火墙和selinux，haproxy和keepalived的状态，监听端口等
所有节点查看防火墙状态必须为disable和inactive：systemctl status firewalld
所有节点查看selinux状态，必须为disable：getenforce
master节点查看haproxy和keepalived状态：systemctl status keepalived haproxy
master节点查看监听端口：netstat -lntp
查看routeID是否冲突
Kubernetes组件配置
所有节点创建相关目录
[root@sxy-k8sB-master01 log]# mkdir -p /etc/kubernetes/manifests/ /etc/systemd/system/kubelet.service.d /var/lib/kubelet /var/log/kubernetes
Apiserver
所有Master节点创建kube-apiserver service，# 注意，如果不是高可用集群，192.168.202.199改为master01的地址
Master01配置
[root@sxy-k8sB-master01 log]# 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=192.168.202.191 \
--service-cluster-ip-range=17.96.0.0/12 \
--service-node-port-range=30000-32767 \
--etcd-servers=https://192.168.202.191:2379,https://192.168.202.192:2379,https://192.168.202.193:2379 \
--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
master02
[root@sxy-k8sB-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=192.168.202.192 \
--service-cluster-ip-range=17.96.0.0/12 \
--service-node-port-range=30000-32767 \
--etcd-servers=https://192.168.202.191:2379,https://192.168.202.192:2379,https://192.168.202.193:2379 \
--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
master03
[root@sxy-k8sB-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=192.168.202.193 \
--service-cluster-ip-range=17.96.0.0/12 \
--service-node-port-range=30000-32767 \
--etcd-servers=https://192.168.202.191:2379,https://192.168.202.192:2379,https://192.168.202.193:2379 \
--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
启动apiserver
所有Master节点开启kube-apiserver
[root@sxy-k8sB-master01 log]# 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.
检测kube-server状态
[root@sxy-k8sB-master01 log]# 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 Thu 2021-09-23 15:28:21 CST; 21s ago
Docs: https://github.com/kubernetes/kubernetes
Main PID: 3230 (kube-apiserver)
CGroup: /system.slice/kube-apiserver.service
└─3230 /usr/local/bin/kube-apiserver --v=2 --logtostderr=true --allow-privileged=true --bind-address=0.0.0.0 --secure-port=6443 --i...
ControllerManager
所有Master节点配置kube-controller-manager service
k8s Pod网段为174.16.0.0/12，该网段不能和宿主机的网段、k8s Service网段的重复，请按需修改
[root@sxy-k8sB-master01 log]# 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=174.16.0.0/12 \
--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
所有Master节点启动kube-controller-manager
[root@sxy-k8sB-master01 log]# systemctl daemon-reload
[root@sxy-k8sB-master01 log]# 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.
### 查看启动状态
[root@sxy-k8sB-master01 log]# systemctl enable --now kube-controller-manager
[root@sxy-k8sB-master01 log]# 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 Thu 2021-09-23 15:31:53 CST; 41s ago
Docs: https://github.com/kubernetes/kubernetes
Main PID: 3566 (kube-controller)
CGroup: /system.slice/kube-controller-manager.service
遇到无法启动的请使用重启大法
Scheduler
所有Master节点配置kube-scheduler service
[root@sxy-k8sB-master03 kubernetes]# 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
[Install]
WantedBy=multi-user.targe
[root@sxy-k8sB-master01 pki]# systemctl daemon-reload
[root@sxy-k8sB-master01 pki]# systemctl enable --now kube-scheduler
TLS Bootstrapping配置
在Master01创建bootstrap
注意，如果不是高可用集群，192.168.202.199:8443改为master01的地址，8443改为apiserver的端口，默认是6443
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@sxy-k8sB-master01 ~]# cd /root/k8s-ha-install/bootstrap
[root@sxy-k8sB-master01 bootstrap]# kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://192.168.202.199:8443 --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
Cluster "kubernetes" set.
[root@sxy-k8sB-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@sxy-k8sB-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@sxy-k8sB-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".
[root@sxy-k8sB-master01 bootstrap]# mkdir -p /root/.kube ; cp /etc/kubernetes/admin.kubeconfig /root/.kube/config
[root@sxy-k8sB-master01 bootstrap]# kubectl create -f bootstrap.secret.yaml
复制证书
Master01节点复制证书至Node节点
[root@sxy-k8sB-master01 bootstrap]# cd /etc/kubernetes/
[root@sxy-k8sB-master01 kubernetes]# for NODE in sxy-k8sB-master02 sxy-k8sB-master03 sxy-k8sB-node01 sxy-k8sB-node02; do
> ssh $NODE mkdir -p /etc/kubernetes/pki /etc/etcd/ssl /etc/etcd/ssl
> for FILE in etcd-ca.pem etcd.pem etcd-key.pem; do
> scp /etc/etcd/ssl/$FILE $NODE:/etc/etcd/ssl/
> done
> for FILE in pki/ca.pem pki/ca-key.pem pki/front-proxy-ca.pem bootstrap-kubelet.kubeconfig; do
> scp /etc/kubernetes/$FILE $NODE:/etc/kubernetes/${FILE}
> done
> done
Kubelet配置
所有节点创建相关目录
[root@sxy-k8sB-master01 kubernetes]# mkdir -p /var/lib/kubelet /var/log/kubernetes /etc/systemd/system/kubelet.service.d /etc/kubernetes/manifests/
所有节点配置kubelet service
[root@sxy-k8sB-node02 ~]# 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
所有节点配置kubelet service的配置文件
[root@sxy-k8sB-master01 kubernetes]# 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-amd64:3.2"
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
所有节点创建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@sxy-k8sB-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:
- 17.96.0.10
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
启动所有节点kubelet
[root@sxy-k8sB-master01 kubernetes]# systemctl daemon-reload
[root@sxy-k8sB-master01 kubernetes]# systemctl enable --now kubelet
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.
此时系统日志/var/log/messages
Unable to update cni config: no networks found in /etc/cni/net.d 显示只有如下信息为正常
kube-proxy配置
注意，如果不是高可用集群，192.168.202.199:8443改为master01的地址，8443改为apiserver的端口，默认是6443
以下操作在Master01执行
[root@sxy-k8sB-master01 kubernetes]# cd /root/k8s-ha-install
kubectl -n kube-system create serviceaccount kube-proxy
kubectl create clusterrolebinding system:kube-proxy --clusterrole system:node-proxier --serviceaccount kube-system:kube-proxy
SECRET=$(kubectl -n kube-system get sa/kube-proxy \
--output=jsonpath='{.secrets[0].name}')
JWT_TOKEN=$(kubectl -n kube-system get secret/$SECRET \
--output=jsonpath='{.data.token}' | base64 -d)
PKI_DIR=/etc/kubernetes/pki
K8S_DIR=/etc/kubernetes
kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://192.168.202.199:8443 --kubeconfig=${K8S_DIR}/kube-proxy.kubeconfig
kubectl config set-credentials kubernetes --token=${JWT_TOKEN} --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
kubectl config set-context kubernetes --cluster=kubernetes --user=kubernetes --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
kubectl config use-context kubernetes --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
在master01将kube-proxy的systemd Service文件发送到其他节点
如果更改了集群Pod的网段，需要更改kube-proxy/kube-proxy.conf的clusterCIDR: 174.16.0.0/12参数为pod的网段。
for NODE in sxy-k8sB-master01 sxy-k8sB-master02sxy-k8sB-master03; do
scp ${K8S_DIR}/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
for NODE in sxy-k8sB-node01 sxy-k8sB-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
所有节点启动kube-proxy
[root@sxy-k8sB-master01 k8s-ha-install]# systemctl daemon-reload
[root@sxy-k8sB-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.
安装Calico
以下步骤只在master01执行
[root@sxy-k8sB-master01 k8s-ha-install]# cd /root/k8s-ha-install/calico/
#修改calico-etcd.yaml的以下位置
[root@sxy-k8sB-master01 calico]# sed -i 's#etcd_endpoints: "http://<ETCD_IP>:<ETCD_PORT>"#etcd_endpoints: "https://192.168.202.191:2379,https://192.168.202.192:2379,https://192.168.202.193:2379"#g' calico-etcd.yaml
[root@sxy-k8sB-master01 calico]# ETCD_CA=`cat /etc/kubernetes/pki/etcd/etcd-ca.pem | base64 | tr -d '\n'`
[root@sxy-k8sB-master01 calico]# ETCD_CERT=`cat /etc/kubernetes/pki/etcd/etcd.pem | base64 | tr -d '\n'`
[root@sxy-k8sB-master01 calico]# ETCD_KEY=`cat /etc/kubernetes/pki/etcd/etcd-key.pem | base64 | tr -d '\n'`
[root@sxy-k8sB-master01 calico]# sed -i "s@# etcd-key: null@etcd-key: ${ETCD_KEY}@g; s@# etcd-cert: null@etcd-cert: ${ETCD_CERT}@g; s@# etcd-ca: null@etcd-ca: ${ETCD_CA}@g" calico-etcd.yaml
[root@sxy-k8sB-master01 calico]# sed -i 's#etcd_ca: ""#etcd_ca: "/calico-secrets/etcd-ca"#g; s#etcd_cert: ""#etcd_cert: "/calico-secrets/etcd-cert"#g; s#etcd_key: "" #etcd_key: "/calico-secrets/etcd-key" #g' calico-etcd.yaml
# 更改此处为自己的pod网段
[root@sxy-k8sB-master01 calico]# POD_SUBNET="174.16.0.0/12"
注意下面的这个步骤是把calico-etcd.yaml文件里面的CALICO_IPV4POOL_CIDR下的网段改成自己的Pod网段，也就是把192.168.x.x/16改成自己的集群网段，并打开注释：
sed -i 's@# - name: CALICO_IPV4POOL_CIDR@- name: CALICO_IPV4POOL_CIDR@g; s@# value: "192.168.202.0/24"@ value: '"${POD_SUBNET}"'@g' calico-etcd.yaml
安装CoreDNS
安装对应版本（推荐）
[root@sxy-k8sB-master01 ~]# cd /root/k8s-ha-install/
[root@sxy-k8sB-master01 k8s-ha-install]# sed -i "s#10.96.0.10#17.96.0.10#g" CoreDNS/coredns.yaml
安装coredns
[root@sxy-k8sB-master01 k8s-ha-install]# kubectl create -f CoreDNS/coredns.yaml
K8S/Kubernetes社区为您提供最前沿的新闻资讯和知识内容
更多推荐
20
0- 0
已为社区贡献2条内容
所有评论(0)