一、配置静态 IP

1. 编辑网络配置文件

vim /etc/sysconfig/network-scripts/ifcfg-ens33

2. 配置内容

TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="static"        # 静态IP
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"
IPV6_ADDR_GEN_MODE="stable-privacy"
NAME="ens33"
UUID="40375228-4de2-4a0c-ac09-dba6f73cc0d1"
DEVICE="ens33"
ONBOOT="yes"              # 开机启用
IPADDR=192.168.1.198      # 本机IP
NETMASK=255.255.255.0     # 子网掩码
GATEWAY=192.168.1.1       # 网关
DNS1=8.8.8.8              # 主DNS
DNS2=221.7.128.68         # 备DNS
PREFIX=24

3. 重启网络服务

systemctl restart network

二、更换 Yum 源为阿里云镜像

1. 备份原镜像源

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo_bak

2. 新建并编辑镜像源文件

vim /etc/yum.repos.d/CentOS-Base.repo

3. 写入以下内容（CentOS 7.9 阿里云 vault 源）

[base]
name=CentOS-$releasever - Base - mirrors.aliyun.com
failovermethod=priority
baseurl=https://mirrors.aliyun.com/centos-vault/7.9.2009/os/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-7

[updates]
name=CentOS-$releasever - Updates - mirrors.aliyun.com
failovermethod=priority
baseurl=https://mirrors.aliyun.com/centos-vault/7.9.2009/updates/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-7

[extras]
name=CentOS-$releasever - Extras - mirrors.aliyun.com
failovermethod=priority
baseurl=https://mirrors.aliyun.com/centos-vault/7.9.2009/extras/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-7

[centosplus]
name=CentOS-$releasever - Plus - mirrors.aliyun.com
failovermethod=priority
baseurl=https://mirrors.aliyun.com/centos-vault/7.9.2009/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-7

[contrib]
name=CentOS-$releasever - Contrib - mirrors.aliyun.com
failovermethod=priority
baseurl=https://mirrors.aliyun.com/centos-vault/7.9.2009/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=https://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-7

4. 更新缓存

yum clean all && yum makecache

三、安装 Docker

1. 安装基础工具

yum install -y lrzsz

2. 创建安装脚本

vim docker.sh

docker.sh 内容

cat << EOF | tee /etc/modules-load.d/k8s.conf 
overlay
br_netfilter
EOF

modprobe overlay
modprobe br_netfilter

cat << EOF | tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward = 1
EOF

sysctl --system

yum install -y yum-utils device-mapper-persistent-data lvm2

yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

yum install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

3. 执行脚本

chmod +x docker.sh
bash docker.sh

四、配置 Docker 镜像加速器

1. 创建 Docker 配置目录

sudo mkdir -p /etc/docker

2. 编辑配置文件

vim /etc/docker/daemon.json

3. 写入以下内容

{
  "registry-mirrors": [
    "https://registry.docker-cn.com",
    "https://docker.mirrors.ustc.edu.cn",
    "https://hub-mirror.c.163.com",
    "https://mirror.baidubce.com",
    "https://ccr.ccs.tencentyun.com"
  ]
}

五、启动并验证 Docker

1. 启动与设置开机自启

sudo systemctl daemon-reload
sudo systemctl restart docker
sudo systemctl enable docker

2. 验证安装

docker version
docker info