在内网环境下，一般不能联网能在线部署，这时候就需要以离线的方式安装docker。本节内容主要总结离线安装docker的步骤。

1. 下载docker安装包

官方地址：https://download.docker.com/linux/static/stable/x86_64/docker-20.10.12.tgz

由于之前已经下载过，当前文件夹已经提供docker-20.10.12.tgz 可以直接进行使用

2. 解压缩

tar -zxvf docker-20.10.12.tgz

3. 解压的docker文件夹全部移动至/usr/bin目录

cp -p docker/* /usr/bin

4. 将docker注册为系统服务

① 在/usr/lib/systemd/system/目录下，创建docker.service文件

② 编辑docker.service文件

复制代码

 vi /usr/lib/systemd/system/docker.service

$Unit$
Description=Docker Application Container Engine

Documentation=http://docs.docker.com

After=network.target docker.socket
$Service$
Type=notify

EnvironmentFile=-/run/flannel/docker

WorkingDirectory=/usr/local/bin

ExecStart=/usr/bin/dockerd \

-H tcp://0.0.0.0:4243 \

-H unix:///var/run/docker.sock \

--selinux-enabled=false \

--log-opt max-size=1g

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=on-failure
$Install$
WantedBy=multi-user.target

5. 重启生效

重启守护进程

systemctl daemon-reload

systemctl start docker

查看docker状态

systemctl status docker

设置开机启动

#systemctl enable docker

docker version