离线安装Docker并导入外部镜像

一、安装环境

目标服务器系统：RHEL7.4，Docker离线安装包版本：20.10.12

二、安装

1、解压上传的压缩包，解压后当前路径会生成一个docker目录：

　　tar -zxf docker-20.10.12.tgz

2、将docker服务注册为service

　　cp docker/* /usr/bin/

　　vim /etc/systemd/system/docker.service

　　将如下内容粘贴到docker.service后保存退出；

       ps：需要root权限，如果权限被限制，可以通过ln -s 软连接指到 /etc/systemd/system/docker.service

 

[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

 

 

4、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

5、验证

systemctl status docker                                                         #查看Docker状态

 

6、在另一台Docker服务器上导出镜像：

#镜像备份

docker save imagename  -o  /home/路径/镜像名.tar

7、在目标服务器导入镜像：

#还原镜像

# docker load --input 镜像名.tar