1)先安装wget
执行命令 yum install -y wget
[root@localhost ~]# yum install -y wget
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2) 查询国内镜像源
打开阿里镜像http://mirrors.aliyun.com/
点击帮助：
3）下载CentOS 7的repo文件
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
#或者
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
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4）更新镜像源
#清除缓存
yum clean all
#生成缓存
yum makecache
执行命令：yum -y update
更新yum源，等待更新完毕即可。
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[root@localhost ~]# yum clean all
Loaded plugins: fastestmirror
Cleaning repos: base extras updates
Cleaning up everything
Cleaning up list of fastest mirrors
[root@localhost ~]# yum makecache
Loaded plugins: fastestmirror
base | 3.6 kB 00:00:00
extras | 3.4 kB 00:00:00
updates | 3.4 kB 00:00:00
(1/12): base/7/x86_64/group_gz | 155 kB 00:00:00
(2/12): extras/7/x86_64/filelists_db | 770 kB 00:00:02
(3/12): extras/7/x86_64/primary_db | 151 kB 00:00:00
(4/12): extras/7/x86_64/other_db | 640 kB 00:00:07
(5/12): updates/7/x86_64/filelists_db
.......省略
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