1.1 卸载旧版本
如果电脑上已经存在docker，需要先卸载可能存在的旧版本：
1. 删除某软件,及其安装时自动安装的所有包
sudo apt-get autoremove docker docker-ce docker-engine docker.io containerd runc
2. 删除docker其他没有没有卸载
dpkg -l | grep docker dpkg -l |grep ^rc|awk '{print $2}' |sudo xargs dpkg -P # 删除无用的相关的配置文件
1.2 下载docker安装包
1、去官网下载docker 安装二进制包，选择适合自己的版本。这里下载的是docker-19.03.3.tgz，在centos7中安装（cento6无法使用，提示linux版本内核版本太低）
下载地址：https://download.docker.com/linux/static/stable/x86_64/
2、复制docker-19.03.3.tgz到服务器上
2、安装和缺载
在docker-19.03.3.tgz目录创建文件
2.1 准备docker.service 系统配置文件
1、准备配置文件
vi docker.service
docker.service [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