centos7 离线安装docker超级简单的方法

方法1

• 下载二进制包 然后解压

tar xzvf docker-19.03.5.tgz

• 将解压出来的 docker 文件所有内容移动到 /usr/bin/ 目录下

cp docker/* /usr/bin/

• 开启 docker 守护进程

sudo /usr/bin/dockerd &

• 测试是否安装成功

docker --version
docker ps -a

• 注册系统服务

vim /usr/lib/systemd/system/docker.service 
# 添加如下内容
[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
 
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

• 重载服务与开机自启

# 重载服务
systemctl daemon-reload
# 开机自启动
systemctl enable docker.service

方法二（更简单）

• 下载rpm安装文件

• 安装

sudo yum install /path/to/package.rpm

• 启动docker

sudo systemctl start docker

• 验证安装是否成功

docker --version
docker ps -a