一、docker简介及卸载、安装

[root@localhost ~]# yum list installed |grep docker
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
containerd.io.x86_64                       1.6.22-3.1.el7              @docker-ce-stable
docker-buildx-plugin.x86_64                0.11.2-1.el7                @docker-ce-stable
docker-ce.x86_64                           3:24.0.6-1.el7              @docker-ce-stable
docker-ce-cli.x86_64                       1:24.0.6-1.el7              @docker-ce-stable
docker-ce-rootless-extras.x86_64           24.0.6-1.el7                @docker-ce-stable
docker-compose-plugin.x86_64               2.21.0-1.el7                @docker-ce-stable

有一个报错，我们直接运行
[root@localhost ~]# yum makecache fast
Loaded plugins: fastestmirror, langpacks
base

3、查看docker相关的rpm源文件

[root@localhost ~]# rpm -qa |grep docker
docker-ce-cli-24.0.6-1.el7.x86_64
docker-ce-24.0.6-1.el7.x86_64
docker-buildx-plugin-0.11.2-1.el7.x86_64
docker-compose-plugin-2.21.0-1.el7.x86_64
docker-ce-rootless-extras-24.0.6-1.el7.x86_64

4、删除所有安装的docker文件包

[root@localhost ~]# yum -y remove containerd.io.x86_64 docker-buildx-plugin.x86_64 docker-ce.x86_64 docker-ce-cli.x86_64 docker-ce-rootless-extras.x86_64 docker-compose-plugin.x86_64

5、删除docker的镜像文件，默认在/var/lib/docker目录下

[root@localhost lib]# rm -rf /var/lib/docker
[root@localhost lib]# rm -rf /var/lib/containerd

到此docker卸载就完成了

六、docker安装

官网：https://docs.docker.com/engine/install/centos/

1、下载Docker依赖组件
[root@localhost lib]# yum -y install yum-utils device-mapper-persistent-datalvm2
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: mirrors.jlu.edu.cn
 * epel: ftp.kaist.ac.kr
 * extras: mirrors.aliyun.com
 * updates: mirrors.aliyun.com
Package yum-utils-1.1.31-54.el7_8.noarch already installed and latest version
No package device-mapper-persistent-datalvm2 available.
Nothing to do

2、安装gcc gcc-c++ 相关依赖
3、设置下载Docker的镜像源为阿里云
[root@localhost lib]# yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
Loaded plugins: fastestmirror, langpacks
adding repo from: http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
grabbing file http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo
repo saved to /etc/yum.repos.d/docker-ce.repo
4、更新yum软件包索引
[root@localhost docker]# yum makecache fast

5、安装Docker服务
[root@localhost lib]# yum -y install docker-ce docker-ce-cli containerd.io

6、设置开机自动启动
[root@localhost lib]# systemctl enable docker
7、测试安装成功
[root@localhost lib]# docker version
8、启动docker
[root@localhost lib]# systemctl start docker
9、查看docker 运行状态
[root@localhost lib]# systemctl status docker.service 

10、测试docker
[root@localhost lib]# docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
c1ec31eb5944: Pull complete 
Digest: sha256:266b191e926f65542fa8daaec01a192c4d292bff79426f47300a046e1bc576fd
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/


[root@localhost lib]# 
看到 Hello from Docker! 字段说明我们的安装步骤没有问题，Docker已经成功安装~

七、阿里云镜像加速

镜像地址通过阿里云官网查看

要配置Docker使用这些加速器，你可以编辑Docker的配置文件daemon.json（通常位于
/etc/docker/），并添加registry-mirrors键值。以下是一个示例配置：

[root@localhost docker]# tee /etc/docker/daemon.json <<-'EOF'
> {
>   "registry-mirrors": ["https://t2exmlj4.mirror.aliyuncs.com"]
> }
> EOF
{
  "registry-mirrors": ["https://t2exmlj4.mirror.aliyuncs.com"]
}
[root@localhost docker]# 
[root@localhost docker]# 
[root@localhost docker]# ll
total 4
-rw-r--r--. 1 root root 67 May 28 16:19 daemon.json
[root@localhost docker]# 
[root@localhost docker]# 
[root@localhost docker]# cat daemon.json 
{
  "registry-mirrors": ["https://t2exmlj4.mirror.aliyuncs.com"]
}
[root@localhost docker]# 
[root@localhost docker]# 
[root@localhost docker]# systemctl daemon-reload
[root@localhost docker]# systemctl restart docker
[root@localhost docker]# 
[root@localhost docker]# systemctl status docker