一、无网络环境docker安装
有网络时docker安装非常方便，使用yum命令进行安装即可。没网络该咋样安装docker呢？下面将无网络环境docker安装过程做一记录。、
下面安装过程是在rhel7.7系统上进行的。
1.安装依赖包：yum install -y yum-utils device-mapper-persistent-data lvm2
2..首先需要下载好docker的二进制安装文件压缩包，地址：https://download.docker.com/linux/static/stable/
根据自己的平台下载相应的压缩包，版本自己选择，我这里下载的是：docker-17.03.0-ce.tgz。
2.拷贝tar到机器中解压：tar -xzvf docker-17.03.0-ce.tgz
3.将解压的文件拷贝到/usr/bin/目录下：cp docker/* /usr/bin/
4.创建docker.service。
在/etc/systemd/system/下创建docker.service文件，内容如下：
[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.赋权：chmod +x /etc/systemd/system/docker.service
6.使配置生效、启动docker服务并查看服务状态：systemctl daemon-reload systemctl start docker.service systemctl status docker.service
7. 设置服务自启动：systemctl enable docker.service
8.检查docker安装是否成功：docker info
如图出现上述docker信息证明安装完成。
二、以自己现在的环境为准制作自己的docker基础镜像：
1.将环境打包：
tar --numeric-owner --exclude=/proc --exclude=/sys -cvf rhel7.7_base.tar /
2.将制作的镜像导入并命名：
cat rhel7.7_base.tar | docker import - rhel7.7_mini
3.查询镜像docker images
以上基础镜像 制作成功。