实际项目部署中经常会有服务器没有外网权限的情况，针对没有外网情况下如何安装docker服务
1.下载docker官方离线包
在有外网的环境中先把离线包下载下来
安装包官方地址：https://download.docker.com/linux/static/stable/x86_64/
2.上传离线包到服务器
使用scp命令或ftp工具将下载下来的离线包上传到指定服务器上
3.离线包解压
tar -zxvf docker-20.10.8.tgz
4.复制解压文件到/usr/bin/下
sudo cp docker/* /usr/bin/
5.注册docker为service服务
在/etc/systemd/system/目录下新增docker.service文件
sudo vi /etc/systemd/system/docker.service
输入内容
[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
# 如果有搭建私有镜像仓库，--insecure-registry设置为私有镜像仓库地址。
ExecStart=/usr/bin/dockerd --selinux-enabled=false --insecure-registry=127.0.0.1
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
6.启动docker服务
赋予docker.service 执行权限
chmod +x /etc/systemd/system/docker.service
重载配置文件以生效
systemctl daemon-reload
启动
sudo systemctl start docker
设置服务开机自启
sudo systemctl enable docker.service
查看服务状态
systemctl status docker
