一、基础配置

修改主机名

# 在 172.17.32.23 上:
hostnamectl set-hostname k8s-master01
bash
​
# 在 172.17.32.38 上:
hostnamectl set-hostname k8s-master02
bash
​
# 在 172.17.32.43 上:
hostnamectl set-hostname k8s-master03
bash
​
# 在 172.17.32.32 上:
hostnamectl set-hostname k8s-node01
bash

配置hosts解析

各个节点操作

cat <<EOF >>/etc/hosts
172.17.32.23 k8s-master01
172.17.32.38 k8s-master02
172.17.32.43 k8s-master03
172.17.32.32 k8s-node01
EOF
​
echo "127.0.0.1   $(hostname)" >> /etc/hosts

二、安装docker

创建文件存放目录

mkdir /application

cat /application/install-docker.sh
#!/bin/bash
​
# 在 master 节点和 worker 节点都要执行
​
# 安装 docker
# 参考文档如下
# https://docs.docker.com/install/linux/docker-ce/centos/ 
# https://docs.docker.com/install/linux/linux-postinstall/
​
# 卸载旧版本
yum remove -y docker \
docker-client \
docker-client-latest \
docker-ce-cli \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-selinux \
docker-engine-selinux \
docker-engine
​
# 设置 yum repository
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
​
# 安装并启动 docker
yum install -y docker-ce-19.03.11 docker-ce-cli-19.03.11 containerd.io-1.2.13
​
mkdir /etc/docker || true
​
cat > /etc/docker/daemon.json <<EOF
{
  "registry-mirrors": ["https://registry.cn-hangzhou.aliyuncs.com"],
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2",
  "storage-opts": [
    "overlay2.override_kernel_check=true"
  ]
}
EOF
​
mkdir -p /etc/systemd/system/docker.service.d
​
# Restart Docker
systemctl daemon-reload
systemctl enable docker
systemctl restart docker
​
# 安装 nfs-utils
# 必须先安装 nfs-utils 才能挂载 nfs 网络存储
yum install -y nfs-utils
yum install -y wget
​
# 关闭 防火墙
systemctl stop firewalld
systemctl disable firewalld
​
# 关闭 SeLinux
setenforce 0
sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
​
# 关闭 swap
swapoff -a
yes | cp /etc/fstab /etc/fstab_bak
cat /etc/fstab_bak |grep -v swap > /etc/fstab
​
# 修改 /etc/sysctl.conf
# 如果有配置，则修改
sed -i "s#^net.ipv4.ip_forward.*#net.ipv4.ip_forward=1#g"  /etc/sysctl.conf
sed -i "s#^net.bridge.bridge-nf-call-ip6tables.*#net.bridge.bridge-nf-call-ip6tables=1#g"  /etc/sysctl.conf
sed -i "s#^net.bridge.bridge-nf-call-iptables.*#net.bridge.bridge-nf-call-iptables=1#g"  /etc/sysctl.conf
sed -i "s#^net.ipv6.conf.all.disable_ipv6.*#net.ipv6.conf.all.disable_ipv6=1#g"  /etc/sysctl.conf
sed -i "s#^net.ipv6.conf.default.disable_ipv6.*#net.ipv6.conf.default.disable_ipv6=1#g"  /etc/sysctl.conf
sed -i "s#^net.ipv6.conf.lo.disable_ipv6.*#net.ipv6.conf.lo.disable_ipv6=1#g"  /etc/sysctl.conf
sed -i "s#^net.ipv6.conf.all.forwarding.*#net.ipv6.conf.all.forwarding=1#g"  /etc/sysctl.conf
# 可能没有，追加
echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
echo "net.bridge.bridge-nf-call-ip6tables = 1" >> /etc/sysctl.conf
echo "net.bridge.bridge-nf-call-iptables = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.default.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.lo.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.all.forwarding = 1"  >> /etc/sysctl.conf
# 执行命令以应用
sysctl -p
​
# 配置K8S的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
​
# 卸载旧版本
yum remove -y kubelet kubeadm kubectl
​
# 安装kubelet、kubeadm、kubectl
# 将 ${1} 替换为 kubernetes 版本号，例如 1.19.0
# yum install -y kubelet-${1} kubeadm-${1} kubectl-${1}
​