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Installation of domestic yum source (163, Alibaba Cloud, epel)
----Alibaba cloud mirror source
1. Backup
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
2. Download the new CentOS-Base.repo to /etc/yum.repos.d/
Cent OS 5
wget -O /etc/yum.repos.d/CentOS-Base.repo
http://mirrors.aliyun.com/repo/Centos-5.repo
or
curl -o /etc/yum.repos.d/CentOS-Base.repo
http://mirrors.aliyun.com/repo/Centos-5.repo
Cent OS 6
wget -O /etc/yum.repos.d/CentOS-Base.repo
http://mirrors.aliyun.com/repo/Centos-6.repo
or
curl -o /etc/yum.repos.d/CentOS-Base.repo
http://mirrors.aliyun.com/repo/Centos-6.repo
Cent OS 7
wget -O /etc/yum.repos.d/CentOS-Base.repo
http://mirrors.aliyun.com/repo/Centos-7.repo
or
curl -o /etc/yum.repos.d/CentOS-Base.repo
http://mirrors.aliyun.com/repo/Centos-7.repo
3. Then run the command to generate the cache
yum clean all && yum makecache
----163 mirror source
1: Back up your original image file so that it can be restored after an error.
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
2: Download the new CentOS-Base.repo to /etc/yum.repos.d/
Cent OS 5
wget -O /etc/yum.repos.d/CentOS-Base.repo
http://mirrors.163.com/.help/CentOS5-Base-163.repo
Cent OS 6
wget -O /etc/yum.repos.d/CentOS-Base.repo
http://mirrors.163.com/.help/CentOS6-Base-163.repo
Cent OS 7
wget -O /etc/yum.repos.d/CentOS-Base.repo
http://mirrors.163.com/.help/CentOS7-Base-163.repo
3. Then run the command to generate the cache
yum clean all && yum makecache
2. Download the new repo to /etc/yum.repos.d/
epel (RHEL 7)
wget -O /etc/yum.repos.d/epel.repo
http://mirrors.aliyun.com/repo/epel-7.repo
epel (RHEL 6)
wget -O /etc/yum.repos.d/epel.repo
http://mirrors.aliyun.com/repo/epel-6.repo
epel (RHEL 5)
wget -O /etc/yum.repos.d/epel.repo
http://mirrors.aliyun.com/repo/epel-5.repo
----Official source direct installation
CentOS/RHEL 5 ：
CentOS/RHEL 6 ：
CentOS/RHEL 7 ：
------------------------------------------------script- -------------------------------------------------- --
---------------------阿里云--------------
CentOS 6
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
wget -O /etc/yum.repos.d/CentOS-Base.repo
http://mirrors.aliyun.com/repo/Centos-6.repo
yum clean all && yum makecache
mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.backup
mv /etc/yum.repos.d/epel-testing.repo /etc/yum.repos.d/epel-testing.repo.backup
wget -O /etc/yum.repos.d/epel.repo
http://mirrors.aliyun.com/repo/epel-6.repo
CentOS 6
---------------------网易--------------
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
wget -O /etc/yum.repos.d/CentOS-Base.repo
http://mirrors.163.com/.help/CentOS6-Base-163.repo
yum clean all && yum makecache
mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.backup
mv /etc/yum.repos.d/epel-testing.repo /etc/yum.repos.d/epel-testing.repo.backup
wget -O /etc/yum.repos.d/epel.repo
http://mirrors.aliyun.com/repo/epel-6.repo
参考：prefer：
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参考1：
https://yq.aliyun.com/articles/38561 CentOS6使用第三方YUM源（EPEL、RPMForge和RPMFusion）
写的比较详细，可以好好参考：
1、安装yum-priorities插件
2、CentOS默认源设置（一般设置CentOS-Base，设置为优先级最高1）
3、安装epel
4、安装rpmforge
5、安装rpmfusion
6、加载所有YUM源
yum list #列出所有第三方YUM源的软件包
参考2：https://www.cnblogs.com/imweihao/p/7357484.html 国内yum源的安装(163，阿里云，epel)
比较全。
参考3：官方源、镜像源汇总：
https://www.cnblogs.com/clsn/p/8372108.html
总结了官方的很多源，比较好找。
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