关闭防火墙

systemctl stop firewalld && systemctl disable firewalld

YUM 阿里云源

备份原YUM仓库配置文件

sudo cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

下载并配置阿里云的YUM仓库文件

centos 7.9

sudo curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

或

sudo wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

centos 8+

# 1. 备份现有配置（以防万一）
sudo mkdir -p /etc/yum.repos.d/backup
sudo mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/backup/

# 2. 删除可能存在的重复配置文件
sudo rm -f /etc/yum.repos.d/*.repo

# 3. 验证是否清理干净
ls -la /etc/yum.repos.d/
# 应该只看到 backup 文件夹，没有 .repo 文件

centos 8.1

我实际8.1系统用的也是8.5的repo

sudo curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo

centos 8.5

sudo curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo

清理YUM缓存并生成新缓存

sudo yum clean all  
sudo yum makecache

验证更换是否成功（可以不验证）

yum install gcc

安装Docker

更新系统软件包

yum update -y

检查内核版本 需要内核版本3.10或更高版本。

uname -r

卸载旧版本Docker（如有）

sudo yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-engine

安装一些必要的依赖项

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

添加Docker官方仓库

官方

sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

阿里云镜像源

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

阿里云镜像源（离线方式）

cat > /etc/yum.repos.d/docker-ce.repo <<EOF
[docker-ce-stable]
name=Docker CE Stable - $basearch
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/$releasever/$basearch/stable
enabled=1
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-stable-debuginfo]
name=Docker CE Stable - Debuginfo $basearch
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/$releasever/debug-$basearch/stable
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-stable-source]
name=Docker CE Stable - Sources
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/$releasever/source/stable
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-test]
name=Docker CE Test - $basearch
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/$releasever/$basearch/test
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-test-debuginfo]
name=Docker CE Test - Debuginfo $basearch
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/$releasever/debug-$basearch/test
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-test-source]
name=Docker CE Test - Sources
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/$releasever/source/test
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-nightly]
name=Docker CE Nightly - $basearch
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/$releasever/$basearch/nightly
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-nightly-debuginfo]
name=Docker CE Nightly - Debuginfo $basearch
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/$releasever/debug-$basearch/nightly
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

[docker-ce-nightly-source]
name=Docker CE Nightly - Sources
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/$releasever/source/nightly
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

EOF

安装Docker CE

sudo yum install docker-ce docker-ce-cli containerd.io -y

修改docker存储目录（可略过）

cat > /etc/docker/daemon.json <<'EOF'
{
  "data-root": "/home/docker",
  "registry-mirrors": ["https://docker.xuanyuan.me", "https://dockerproxy.net", "https://docker.mirrors.ustc.edu.cn", "https://hub-mirror.c.163.com", "https://docker.jwong.xin"]
}
EOF

启动并配置Docker

sudo systemctl start docker

设置Docker开机自启

sudo systemctl enable docker

卸载Docker

sudo yum remove docker docker-common docker-selinux docker-engine