转载原文：https://blog.csdn.net/GentleLin/article/details/90294324

背景

由于公司内部服务器只能连内网，即使建立局域网yum源，也无法使用yum在线安装Docker CE。

支持在线安装的朋友们，直接参考CentOS在线安装Docker官方文档即可：https://docs.docker.com/install/linux/docker-ce/centos/

目前最新版本是v19.03.9。

准备工作

1、我使用得操作系统是centos8.2

查看CentOS版本，可通过下面命令查看：

cat /etc/redhat-release

2、下载docker-ce.repo文件

下载地址：https://download.docker.com/linux/centos/docker-ce.repo

3、下载最新的docker-ce、docker-ce-cli、containerd.io安装包

下载地址：https://download.docker.com/linux/centos/7/x86_64/stable/Packages/

注：截图中未出现的docker-ce-selinux安装包在新版本中已经被废弃了，需要下载另外的一个依赖包container-selinux

container-selinux安装包下载地址：https://pkgs.org/download/container-selinux

这个是我下载的链接：

http://mirror.centos.org/altarch/8/AppStream/armhfp/os/Packages/container-selinux-2.94-1.git1e99f1d.module_el8.1.0+132+34fc7673.noarch.rpm

开始安装

1、添加本地源，使用本地镜像制作本地源

2、按顺序依次安装rpm包：

[root@localhost docker]# ls
containerd.io-1.2.6-3.3.el7.x86_64.rpm  container-selinux-2.94-1.git1e99f1d.module_el8.1.0+132+34fc7673.noarch.rpm  docker-ce-19.03.9-3.el7.x86_64.rpm  docker-ce-cli-19.03.9-3.el7.x86_64.rpm
[root@localhost docker]# yum localinstall *

3、安装成功后，启动docker

[root@localhost docker]# systemctl status docker
● docker.service - Docker Application Container EngineLoaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)Active: inactive (dead)Docs: https://docs.docker.com
[root@localhost docker]# systemctl start docker
[root@localhost docker]# systemctl status docker
● docker.service - Docker Application Container EngineLoaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)Active: active (running) since Thu 2020-09-03 10:58:31 CST; 886ms agoDocs: https://docs.docker.comMain PID: 23874 (dockerd)Tasks: 14Memory: 45.3MCGroup: /system.slice/docker.service└─23874 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sockSep 03 10:58:31 localhost.localdomain dockerd[23874]: time="2020-09-03T10:58:31.001056624+08:00" level=info msg="ClientConn switching balancer to \"pick_first\"" module=grpc
Sep 03 10:58:31 localhost.localdomain dockerd[23874]: time="2020-09-03T10:58:31.182677680+08:00" level=warning msg="Your kernel does not support cgroup blkio weight"
Sep 03 10:58:31 localhost.localdomain dockerd[23874]: time="2020-09-03T10:58:31.182710400+08:00" level=warning msg="Your kernel does not support cgroup blkio weight_device"
Sep 03 10:58:31 localhost.localdomain dockerd[23874]: time="2020-09-03T10:58:31.183045714+08:00" level=info msg="Loading containers: start."
Sep 03 10:58:31 localhost.localdomain dockerd[23874]: time="2020-09-03T10:58:31.638312936+08:00" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0.0/16. Daemon option --bip can be used to set a preferr>
Sep 03 10:58:31 localhost.localdomain dockerd[23874]: time="2020-09-03T10:58:31.823372666+08:00" level=info msg="Loading containers: done."
Sep 03 10:58:31 localhost.localdomain dockerd[23874]: time="2020-09-03T10:58:31.891281500+08:00" level=info msg="Docker daemon" commit=9d988398e7 graphdriver(s)=overlay2 version=19.03.9
Sep 03 10:58:31 localhost.localdomain dockerd[23874]: time="2020-09-03T10:58:31.891627774+08:00" level=info msg="Daemon has completed initialization"
Sep 03 10:58:31 localhost.localdomain dockerd[23874]: time="2020-09-03T10:58:31.989503175+08:00" level=info msg="API listen on /var/run/docker.sock"
Sep 03 10:58:31 localhost.localdomain systemd[1]: Started Docker Application Container Engine.
[root@localhost docker]# systemctl enable docker
Created symlink /etc/systemd/system/multi-user.target.wants/docker.service → /usr/lib/systemd/system/docker.service.

4、docker相关命令：

• 查看：docker info
• 重启：systemctl restart docker
• 关闭：systemctl stop docker

四、可能出现的问题
1、在安装以上rpm包的时候，如果出现缺少依赖的错误，比如：

  error: Failed dependencies:policycoreutils >= 2.5-11 is needed by container-selinux-2:2.95-2.el7_6.noarchselinux-policy >= 3.13.1-216.el7 is needed by container-selinux-2:2.95-2.el7_6.noarchselinux-policy-base >= 3.13.1-216.el7 is needed by container-selinux-2:2.95-2.el7_6.noarchselinux-policy-targeted >= 3.13.1-216.el7 is needed by container-selinux-2:2.95-2.el7_6.noarch

出现 “>=版本号”：说明你的系统上已经安装了这些包，只是这些包不是最新的，需要升级
以policycoreutils包为例，可以在https://pkgs.org/上搜索对应的最新的rpm包，执行以下命令进行升级：

# rpm -Uvh policycoreutils-2.5-29.el7.x86_64.rpm

如果对应的这个包被其它包依赖（policycoreutils被policycoreutils-python包依赖），这时会出现错误提示：

 error: Failed dependencies:policycoreutils = 2.5-8.el7 is needed by (installed) policycoreutils-python-2.5-8.el7.x86_64

解决办法：先以不依赖的方式安装policycoreutils，再下载新的policycoreutils-python包升级。

# rpm -Uvh policycoreutils-2.5-29.el7.x86_64.rpm --nodeps
# rpm -Uvh policycoreutils-python-2.5-29.el7.x86_64.rpm

其它类似错误，参考以上方法即可。

2、如果出现的是：

  error: Failed dependencies:xxxxxx is needed by xxxxxxxxxxxxxxxxxx

直接下载对应的包安装即可。