docker安装和卸载
服务器系统：Ubuntu Server 18.04.2 64bit
1 安装docker：
1.1 在线安装
1.# yum install docker
1.2 离线安装 https://download.csdn.net/download/qq_27106141/90477700
1.# docker-18.03.1-ce.tgz
1.2.1 解压
tar -xzvf docker-18.03.1-ce.tgz
1.2.2 将解压出来的docker文件内容移动到 /usr/bin/ 目录下
cp docker/* /usr/bin/
1.2.3 docker注册为service
编辑/usr/lib/systemd/system/docker.service即可使用service docker restart/stop 等操作来启停docker
vi /usr/lib/systemd/system/docker.service
复制以下代码黏贴到docker.service中，保存并退出。
[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
1.2.4 启动 添加文件权限并启动docker
1.# chmod +x /usr/lib/systemd/system/docker.service
2.# systemctl daemon-reload
3.# systemctl start docker
4.# systemctl enable docker.service
1.2.5 验证
1.# systemctl status docker
2.# docker -v
3.# docker images
4.# docker ps -a
5.# docker info
1.3 使用docker
1.3.1 启动docker
1.设置docker开机启动
2.# systemctl enable docker
3.启动docker
4.# systemctl start docker
1 卸载docker：
yum remove docker-ce
rm -rf /var/lib/docker