前置依赖

# 卸载之前的docker
    sudo yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-engine
                  
# 安装必要的依赖
    sudo yum install -y yum-utils \
    device-mapper-persistent-data \
    lvm2

镜像

准备阶段完成后，设置docker仓库、并配置镜像加速器

[阿里镜像]
sudo yum-config-manager --add-repo \
    http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
[官方镜像]
sudo yum-config-manager  --add-repo \
      https://download.docker.com/linux/centos/docker-ce.repo

安装 Docker

# 安装docker
    sudo yum install -y docker-ce docker-ce-cli containerd.io
[或者指定版本]
yum install docker-ce-20.10.16 docker-ce-cli-20.10.16 containerd.io
    
# 启动docker
    sudo systemctl start docker
    
# 测试docker安装是否成功
    sudo docker run hello-world

# 设置开机启动
systemctl enable docker

配置镜像加速器

[访问这个地址，https://cr.console.aliyun.com/cn-hangzhou/instances/mirrors . 使用自己的阿里云账号登录，查看并配置镜像加速器:]

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://v85tx3qs.mirror.aliyuncs.com"],
  "exec-opts": ["native.cgroupdriver=systemd"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker