目前越来越多的应用采用docker部署管理，使快速的部署集成变得更容易。但笔者在安装docker时，遇到一个问题，目标服务器无法联网，这就要求我们能够采用离线的方式安装docker。下面就如何离线安装docker，列出了实施步骤，与大家一起分享。

1. 系统环境

Centos7 Linux version 3.10.0-327.10.1.el7.x86_64

2. docker-ce版本

18.03.0.ce-1.el7.centos.x86_64

3. 在可以联网的机器上制作docker本地安装源

3.1 安装一个虚拟机，然后在虚拟机里面安装centos7（当然，也可以一台可以联网安装了centos7系统的主机）

3.2 创建离线包存放目录,并赋予读写权限

# mkdir -p /home/docker/local 
# chmod -R 777 /home/docker/local

3.3 创建docker的yumrepository

3.3 下载离线docker-ce依赖包

注意，下面指令仅仅下载离线包到指定目录。后面要用到。

yum install --downloadonly --downloaddir=/home/docker/local yum-utils \
  device-mapper-persistent-data \
  lvm2 createrepo 

3.4安装docker-ce依赖包及createrepo

yum install yum-utils \
  device-mapper-persistent-data \
  lvm2 createrepo

3.5 配置docker repository

yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo

3.6 更新yum源索引

yum makecache fast

3.7下载离线docker-ce安装包

yum install --downloadonly --downloaddir=/home/docker/local docker-ce

3.8 获取安装docker需要的密匙

查看密匙文件url

[jerry@localhost ~]$ more /etc/yum.repos.d/docker-ce.repo
[docker-ce-stable]
name=Docker CE Stable - $basearch
baseurl=https://download.docker.com/linux/centos/7/$basearch/stable
enabled=1
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-stable-debuginfo]
name=Docker CE Stable - Debuginfo $basearch
baseurl=https://download.docker.com/linux/centos/7/debug-$basearch/stable
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

下载密匙文件(存放到/home/docker/local下)

cd /home/docker/local
wget https://download.docker.com/linux/centos/gpg

3.9 初始化安装源repodata库

# createrepo -pdo /home/docker/local /home/docker/local
# createrepo --update /home/docker/local

此时，/home/docker/local下面应该有如下安装包、文件及目录

container-selinux-2.42-1.gitad8f0f7.el7.noarch.rpm
createrepo-0.9.9-28.el7.noarch.rpm
device-mapper-1.02.140-8.el7.x86_64.rpm
device-mapper-event-1.02.140-8.el7.x86_64.rpm
device-mapper-event-libs-1.02.140-8.el7.x86_64.rpm
device-mapper-libs-1.02.140-8.el7.x86_64.rpm
device-mapper-persistent-data-0.7.0-0.1.rc6.el7_4.1.x8
docker-ce-18.03.0.ce-1.el7.centos.x86_64.rpm
dracut-033-502.el7_4.1.x86_64.rpm
dracut-config-rescue-033-502.el7_4.1.x86_64.rpm
dracut-network-033-502.el7_4.1.x86_64.rpm
libgudev1-219-42.el7_4.10.x86_64.rpm
libseccomp-2.3.1-3.el7.x86_64.rpm
libselinux-2.5-11.el7.x86_64.rpm
libselinux-python-2.5-11.el7.x86_64.rpm
libselinux-utils-2.5-11.el7.x86_64.rpm
libsemanage-2.5-8.el7.x86_64.rpm
libsemanage-python-2.5-8.el7.x86_64.rpm
libsepol-2.5-6.el7.x86_64.rpm
lvm2-2.02.171-8.el7.x86_64.rpm
lvm2-libs-2.02.171-8.el7.x86_64.rpm
pigz-2.3.3-1.el7.centos.x86_64.rpm
policycoreutils-2.5-17.1.el7.x86_64.rpm
policycoreutils-python-2.5-17.1.el7.x86_64.rpm
python-urlgrabber-3.10-8.el7.noarch.rpm
rpm-4.11.3-25.el7.x86_64.rpm
rpm-build-libs-4.11.3-25.el7.x86_64.rpm
rpm-libs-4.11.3-25.el7.x86_64.rpm
rpm-python-4.11.3-25.el7.x86_64.rpm
selinux-policy-3.13.1-166.el7_4.9.noarch.rpm
selinux-policy-targeted-3.13.1-166.el7_4.9.noarch.rpm
setools-libs-3.3.8-1.1.el7.x86_64.rpm
systemd-219-42.el7_4.10.x86_64.rpm
systemd-libs-219-42.el7_4.10.x86_64.rpm
systemd-python-219-42.el7_4.10.x86_64.rpm
systemd-sysv-219-42.el7_4.10.x86_64.rpm
yum-3.4.3-154.el7.centos.1.noarch.rpm
yum-utils-1.1.31-42.el7.noarch.rpm
repodata
gpg

3.10 打包导出安装源

# cd /home/docker/local# tar -zcvf docker-local.tar.gz *

docker-local.tar.gz这个文件，就是我们制作好的离线安装源。

4.将docker-local.tar.gz copy到无法联网的centos7 服务器上(比如/home/docker/local目录下)，并解压

# mkdir -p /home/docker/local （如果不存在此目录，则创建,然后copy docker-local.tar.gz到此目录）
# cd /home/docker/local
# tar -zxvf docker-local.tar.gz

5 安装createrepo

# cd /home/docker/local
# rpm -ivh createrepo-0.9.9-28.el7.noarch.rpm (这个rpm安装包就是上面我们离线下载的安装包)

6 备份安装源

# cd /etc/yum.repos.d/
# mkdir repobak
# mv * repobak/

7 配置离线安装源

# vi /etc/yum.repos.d/docker-ce-local.repo
[docker]
name=docker local
baseurl=file:///home/docker/local/
gpgcheck=0
enabled=1
gpgkey=file:///home/docker/local/gpg

8 构建本地安装源

# yum clean all (清除缓存)
# yum makecache (创建缓存)# createrepo -d /home/docker/local/repodata

9 检查本地库是否制作成功

repo id repo name status
docker docker local 38
repolist: 38# yum repolist

10. 安装docker-ce

# yum install docker-ce

11.检查是否安装成功

# systemctl start docker
# docker version
Client:
Version: 18.03.0-ce
API version: 1.37
Go version: go1.9.4
Git commit: 0520e24
Built: Wed Mar 21 23:09:15 2018
OS/Arch: linux/amd64
Experimental: false
Orchestrator: swarm

Server:
Engine:
 Version: 18.03.0-ce
 API version: 1.37 (minimum version 1.12)
 Go version: go1.9.4
 Git commit: 0520e24
 Built: Wed Mar 21 23:13:03 2018
 OS/Arch: linux/amd64
 Experimental: false