什么是 Docker

简单来说，Docker 是一个开源的容器化平台，它可以让你：把应用程序和它所有的依赖打包到一个“容器”中运行。

在传统部署中，你可能遇到这样的问题：

“在我机器上能跑啊，怎么你那里就出错了？”

这通常是因为你们的环境（系统版本、依赖库、配置）不一致。

而 Docker 可以彻底解决这个问题。

安装 Docker

由于 Docker 官方并未给出安装教程，本文简单写一下 Docker Engine 的安装步骤：

安装 yum-utils

sudo yum install yum-utils -y

添加安装源到仓库

sudo yum-config-manager –add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

安装 Docker

sudo yum install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

到目前为止都很成功，在安装的时候就开始各种环境报错。

报错如下：

sudo yum install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
Updating Subscription Management repositories.
Unable to read consumer identity

This system is not registered with an entitlement server. You can use subscription-manager to register.

Last metadata expiration check: 2:49:56 ago on Wed 13 Aug 2025 10:59:48 AM CST.
Error:
 Problem 1: package docker-ce-3:26.1.3-1.el8.x86_64 from docker-ce-stable requires container-selinux >= 2:2.74, but none of the providers can be installed
  - cannot install the best candidate for the job
  - package container-selinux-2:2.124.0-1.gitf958d0c.module+el8.5.0+681+c9a1951f.noarch from appstream is filtered out by modular filtering
  - package container-selinux-2:2.130.0-1.module+el8.5.0+770+e2f49861.noarch from appstream is filtered out by modular filtering
  - package container-selinux-2:2.189.0-1.module+el8.7.0+1152+ac778627.noarch from appstream is filtered out by modular filtering
  - package container-selinux-2:2.205.0-3.module+el8.9.0+1445+07728297.noarch from appstream is filtered out by modular filtering
  - package container-selinux-2:2.229.0-2.module+el8.10.0+1815+5fe7415e.noarch from appstream is filtered out by modular filtering
  - package container-selinux-2:2.229.0-2.module+el8.10.0+1825+623b0c20.noarch from appstream is filtered out by modular filtering
  - package container-selinux-2:2.229.0-2.module+el8.10.0+1843+6892ab28.noarch from appstream is filtered out by modular filtering
  - package container-selinux-2:2.229.0-2.module+el8.10.0+1872+2e18eb19.noarch from appstream is filtered out by modular filtering
  - package container-selinux-2:2.229.0-2.module+el8.10.0+1874+ce489889.noarch from appstream is filtered out by modular filtering
  - package container-selinux-2:2.229.0-2.module+el8.10.0+1880+8e896d1b.noarch from appstream is filtered out by modular filtering
  - package container-selinux-2:2.229.0-2.module+el8.10.0+1896+b18fa106.noarch from appstream is filtered out by modular filtering
  - package container-selinux-2:2.229.0-2.module+el8.10.0+1948+4b5cd4a9.noarch from appstream is filtered out by modular filtering
  - package container-selinux-2:2.229.0-2.module+el8.10.0+2001+6a33db9f.noarch from appstream is filtered out by modular filtering

这需要我们自行下载，我看网上都是国外的，但是我机器访问不到，幸好找到了国内的镜像版本，如果你缺少啥，就去这里下载：

https://mirrors.aliyun.com

执行以下命令即可：

sudo yum install https://mirrors.aliyun.com/centos/8-stream/AppStream/aarch64/os/Packages/container-selinux-2.167.0-1.module_el8.6.0+926+8bef8ae7.noarch.rpm

执行后，仍在报错，如下所示：

Last metadata expiration check: 3:04:59 ago on Wed 13 Aug 2025 10:59:48 AM CST.
Error:
 Problem 1: package containerd.io-1.6.32-3.1.el8.x86_64 from docker-ce-stable conflicts with runc provided by runc-1:1.1.12-6.module+el8.10.0+2001+6a33db9f.x86_64 from @System
  - package containerd.io-1.6.32-3.1.el8.x86_64 from docker-ce-stable obsoletes runc provided by runc-1:1.1.12-6.module+el8.10.0+2001+6a33db9f.x86_64 from @System
  - package containers-common-2:1-82.module+el8.10.0+2001+6a33db9f.x86_64 from @System requires oci-runtime, but none of the providers can be installed
  - cannot install the best candidate for the job

我们执行强制执行命令，命令如下：