1.RPM安装方式：
前提：拥有一台连接网络的Linux主机
1.更新yum：yum update
2.下载docker yum源：yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
3.按版本降序列出docker: yum list docker-ce --showduplicates | sort -r
4.下载最新版本Docker所需依赖包: yum install --downloaddir=/root/tmp/ --downloadonly docker-ce:20.10.6
5.进入/root/tmp下安装所有依赖包: rpm -Uvh *.rpm
6.查看docker版本 docker -v
tgz方式安装
1.下载最新的tgz包：https://download.docker.com/linux/static/stable/x86_64/
2.上传到服务器并解压：tar -zxvf XXX.tgz
3.将解压文件复制到 /usr/bin/ 目录：cp docker/* /usr/bin/
4.进入目录：cd /etc/systemd/system/创建文件docker.service，内容如下：
[Unit] Description=Docker Application Container Engine Documentation=https://docs.docker.com After=network-online.target firewalld.service Wants=network-online.target [Service] Type=notify # the default is not to use systemd for cgroups because the delegate issues still # exists and systemd currently does not support the cgroup feature set required # for containers run by docker ExecStart=/usr/bin/dockerd ExecReload=/bin/kill -s HUP $MAINPID # Having non-zero Limit*s causes performance problems due to accounting overhead # in the kernel. We recommend using cgroups to do container-local accounting. LimitNOFILE=infinity LimitNPROC=infinity LimitCORE=infinity # Uncomment TasksMax if your systemd version supports it. # Only systemd 226 and above support this version. #TasksMax=infinity TimeoutStartSec=0 # set delegate yes so that systemd does not reset the cgroups of docker containers Delegate=yes # kill only the docker process, not all processes in the cgroup KillMode=process # restart the docker process if it exits prematurely Restart=on-failure StartLimitBurst=3 StartLimitInterval=60s [Install] WantedBy=multi-user.target
5.给docker.service添加执行权限：chmod +x docker.service
6.重新加载配置文件:docker.service(每次修改docker.service都需要重新加载)
7.启动：systemctl start docker
8.查看：systemctl status docker
