CentOS7上搭建Docker（在线和离线）

1. 在线安装
   安装参考：1. ECS上搭建Docker（CentOS7）
   2. 常用命令参考
2. 离线安装
   获取安装文件 https://pan.baidu.com/s/1uhpwPn0Hbp7CKf_GK1xXhQ
   提取码：q97l
   （1） 解压

tar -xvf docker-18.06.1-ce.tgz

（2）将解压出来的docker文件内容移动到 /usr/bin/ 目录下

cp docker/* /usr/bin/

（3）将docker注册为service

vim /etc/systemd/system/docker.service

（4）将下列配置加到docker.service中并保存

[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）启动

chmod +x /etc/systemd/system/docker.service  #添加文件权限并启动docker

systemctl daemon-reload   #重载unit配置文件

systemctl start docker   #启动Docker

systemctl enable docker.service   #设置开机自启

（6）验证

systemctl status docker    #查看Docker状态

docker -v    #查看Docker版本

（7）如果docker容器启动后，虚拟机就无法连接，请参考该解决办法

1. 删除所有docker容器，
2. 删除所有创建的docker网络
3. https://blog.youkuaiyun.com/yssa1125001/article/details/109694774 按照该地址重新配置docker
4. 重启