1、使yum的CentOS-Extras配置生效

檔案CentOS-Base.repo中enabled的値從0變成1

vim /etc/yum.repos.d/CentOS-Base.repo

[extras]

name=CentOS-$releasever - Extras

mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras

gpgcheck=1

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

※Docker is included by default in the CentOS-Extras repository

2、執行yum　安裝

# yum install docker

3、Docker啟動

# systemctl start docker