1、初始化环境准备：

1.1、环境装备

192.168.230.140 k8s-node01
192.168.230.141 k8s-node02
192.168.230.143 k8s-master01

1、2、设置系统主机名

hostnamectl set-hostname k8s-node01
hostnamectl set-hostname k8s-node02
hostnamectl set-hostname k8s-master01

1.3、分别修改各机器的host文件*

cat >/etc/hosts << EOF
192.168.230.140 k8s-node01
192.168.230.141 k8s-node02
192.168.230.143 k8s-master01
EOF

1.4、安装所需的依赖包

yum install -y conntrack ntpdate ntp ipvsadm ipset jq iptables curl sysstat libseccomp wget vim net-tools git

1.5、设置防火墙为 Iptables 并设置空规则

systemctl stop firewalld && systemctl disable firewalld
yum -y install iptables-services && systemctl start iptables && systemctl enable iptables && iptables -F && service iptables save

1.6、关闭 SELINUX

swapoff -a && sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
setenforce 0 && sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config

1.7、调整内核参数，对于 K8S

cat > kubernetes.conf <<EOF
net.bridge.bridge-nf-call-iptables=1
net.bridge.bridge-nf-call-ip6tables=1
net.ipv4.ip_forward=1
net.ipv4.tcp_tw_recycle=0
vm.swappiness=0 # 禁止使用 swap 空间，只有当系统 OOM 时才允许使用它
vm.overcommit_memory=1 # 不检查物理内存是否够用
vm.panic_on_oom=0 # 开启 OOM
fs.inotify.max_user_instances=8192
fs.inotify.max_user_watches=1048576
fs.file-max=52706963
fs.nr_open=52706963
net.ipv6.conf.all.disable_ipv6=1
net.netfilter.nf_conntrack_max=2310720
EOF
cp kubernetes.conf /etc/sysctl.d/kubernetes.conf
sysctl -p /etc/sysctl.d/kubernetes.conf

1.8、调整系统时区

timedatectl set-timezone Asia/Shanghai
timedatectl set-local-rtc 0
systemctl restart rsyslog
systemctl restart crond

1.9、关闭系统不需要服务

systemctl stop postfix && systemctl disable postfix

1.10、设置 rsyslogd 和 systemd journald

mkdir /var/log/journal
mkdir /etc/systemd/journald.conf.d
cat > /etc/systemd/journald.conf.d/99-prophet.conf <<EOF
[Journal]
Storage=persistent
Compress=yes
SyncIntervalSec=5m
RateLimitInterval=30s
RateLimitBurst=1000
SystemMaxUse=10G
SystemMaxFileSize=200M
MaxRetentionSec=2week
ForwardToSyslog=no
EOF
systemctl restart systemd-journald

1.11、升级系统内核为 4.44

rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
yum --enablerepo=elrepo-kernel install -y kernel-lt
grub2-set-default 'CentOS Linux (4.4.230-1.el7.elrepo.x86_64) 7 (Core)'
reboot

注意：以上步骤需要每一台机器均执行。

2、安装 Docker 以及配置私有仓库

2.1 安装docker软件

yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager \
--add-repo \
http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum update -y && yum install -y docker-ce

2.2 创建 /etc/docker 目录

mkdir /etc/docker

2.3 配置 daemon.json

cat > /etc/docker/daemon.json <<EOF
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
}，
  "registry-mirrors": ["https://t8jbtg0w.mirror.aliyuncs.com"],
  "insecure-registries": ["https://hub.cfzq.com"],
} EOF

注意：其中registry-mirrors为阿里云加速器地址，insecure-registries为私有仓库地址
2.4 重启docker并开机启动

systemctl daemon-reload && systemctl restart docker && systemctl enable docker

2.5连接私有仓库

docker login https://hub.cfzq.com

2.6 测试拉取私有仓库文件

注意：上述步骤所有机器均需执行

3、Kubeadm 部署安装k8s集群：

3.1、kube-proxy开启ipvs的前置条件

modprobe br_netfilter
cat > /etc/sysconfig/modules/ipvs.modules <<EOF
#!/bin/bash
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack_ipv4
EOF
chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules &&
lsmod | grep -e ip_vs -e nf_conntrack_ipv4

3.2、安装 Kubeadm （所有机器）
3.2.1 配置kubernetes yum源

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

3.2.2 安装kubeadm、kubectl、kubelet

yum -y install kubeadm-1.15.1 kubectl-1.15.1 kubelet-1.15.1
systemctl enable kubelet.service

kubelet:运行在cluster所有节点上,负责启动POD和容器
kubeadm:用于初始化cluster
kubectl:kubectl是kubenetes命令行工具，通过kubectl可以部署和管理应用，查看各种资源，创建，删除和更新组件
3.2.3 安装kubeadm基础镜像
上传kubeadm-basic.images.tar.gz。解压，并导入images（需要在每台机器上执行）。
具体可新建如下脚本执行：
#!/bin/bash
ls /root/kubeadm-basic.images > /tmp/image-list.txt
cd /root/kubeadm-basic.images
for i in $(cat /tmp/image-list.txt)
do
docker load -i $i
done
rm -rf /tmp/image-list.txt

3.3 初始化主节点
3.3.1 生成kubeadm-config.yaml文件

kubeadm config print init-defaults > kubeadm-config.yaml

修改配置如下：

apiVersion: kubeadm.k8s.io/v1beta2
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: abcdef.0123456789abcdef
  ttl: 24h0m0s
  usages:
  - signing
  - authentication
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: 192.168.230.143 #需修改
  bindPort: 6443
nodeRegistration:
  criSocket: /var/run/dockershim.sock
  name: k8s-master01
  taints:
  - effect: NoSchedule
    key: node-role.kubernetes.io/master
---
apiServer:
  timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controllerManager: {}
dns:
  type: CoreDNS
etcd:
  local:
    dataDir: /var/lib/etcd
imageRepository: k8s.gcr.io
kind: ClusterConfiguration
kubernetesVersion: v1.15.1#需修改
networking:
  dnsDomain: cluster.local
  podSubnet: "10.244.0.0/16"#需新增
  serviceSubnet: 10.96.0.0/12
scheduler: {}
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
featureGates:
  SupportIPVSProxyMode: true
mode: ipvs

---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
featureGates:
SupportIPVSProxyMode: true
mode: ipvs

3.3.2 根据生成的文件进行kubeadm初始化

kubeadm init --config=kubeadm-config.yaml --experimental-upload-certs | tee kubeadm-init.log

注意：kubeadm-init.log需保留，后期可能会用到
3.3.3 根据生成的日志在master执行如下命令

mkdir -p $HOME/.kube
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
chown $(id -u):$(id -g) $HOME/.kube/config

3.3.4 分别在两台机器执行如下命令，将该节点加入k8s集群中。

kubeadm join 192.168.230.143:6443 --token abcdef.0123456789abcdef   --discovery-token-ca-cert-hash sha256:b4beebdc57cc809471996300fe3d49a4a66e1cc595807f06d80ee52ec927187e

注意：如日志没有保存可通过如下方式：
1、获取hash值：

openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed 's/^.* //'

2、查看token：

kubeadm token list

部署网络flannel

wget -e robots=off https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

分别每台机器安装fanneld会报错，可手工下载tar -zxvf flannel-v0.12.0-linux-amd64.tar.gz
然后 docker load < flanneld-v0.12.0-amd64.docke
kubectl get pod -n kube-system，如下图所示：

上述k8s安装完成

journalctl -xefu kubelet查看k8s集群报错日志

注意kubelet的从group dirver保持和docker的一致，不然会报如下错：