1、CentOs 8.2 安装docker

1、先卸载上个版本的相关软件（我这边使用的是root用户，非最高级请在yum加个 “sudo”）

yum -y remove docker docker-common docker-selinux docker-engine

yum 报错 404 for http://mirrors.cloud.aliyuncs.com/centos/8/AppStream

• 阿里yum源： centos镜像-centos下载地址-centos安装教程-阿里巴巴开源镜像站
• 腾云yum源： CentOS

下面介绍阿里云

1.备份CentOS-Base.repo文件

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

2.aliyun下载CentOS-Base.repo文件

wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo

3.修改CentOS-Base.repo文件

sed -i 's/mirrors.cloud.aliyuncs.com/url_tmp/g' /etc/yum.repos.d/CentOS-Base.repo && sed -i 's/mirrors.aliyun.com/mirrors.cloud.aliyuncs.com/g' /etc/yum.repos.d/CentOS-Base.repo && sed -i 's/url_tmp/mirrors.aliyun.com/g' /etc/yum.repos.d/CentOS-Base.repo

4.修改CentOS-AppStream.repo的内容，替换成CentOS-Base.repo文件中的[AppStream]如：

# CentOS-AppStream.repo
#[AppStream]
#name=CentOS-$releasever - AppStream
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=AppStream&infra=$infra
#baseurl=http://mirror.centos.org/$contentdir/$releasever/AppStream/$basearch/os/
#mirrorlist=http://mirror.centos.org/$contentdir/$releasever/AppStream/$basearch/os/
#gpgcheck=1
#enabled=1
#pgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
#

[AppStream]
name=CentOS-8.5.2111 - AppStream - mirrors.cloud.aliyuncs.com
baseurl=http://mirrors.cloud.aliyuncs.com/centos-vault/8.5.2111/AppStream/$basearch/os/
        http://mirrors.aliyuncs.com/centos-vault/8.5.2111/AppStream/$basearch/os/
        http://mirrors.aliyun.com/centos-vault/8.5.2111/AppStream/$basearch/os/
gpgcheck=0
gpgkey=http://mirrors.cloud.aliyuncs.com/centos/RPM-GPG-KEY-CentOS-Official

5.清除数据，安装测试

yum clean all && yum makecache

2、安装yum工具

yum install -y yum-utils

3、设置yum源

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

4、安装docker-ce时会需要这个包，所以要先装好。

yum install https://download.docker.com/linux/fedora/30/x86_64/stable/Packages/containerd.io-1.2.6-3.3.fc30.x86_64.rpm

5、安装docker-ce

yum install docker-ce -y

6、启动docker

systemctl start docker

7、查看docker版本

docker version