Optimize the base library of Yum source

【 Purpose 】 In itself centos Of yum Source download server is abroad . Need to improve download speed and stability access .

（ One ） Get into yum.repom.d Directory [[email protected] yum.repos.d]# mv CentOS-Base.repo CentOS-Base.repo.bak

[[email protected] ~]# cd /etc/yum.repos.d/
[[email protected] yum.repos.d]# ll
total 32
-rw-r--r--. 1 root root 1664 Apr 28  2018 CentOS-Base.repo
-rw-r--r--. 1 root root 1309 Apr 28  2018 CentOS-CR.repo
-rw-r--r--. 1 root root  649 Apr 28  2018 CentOS-Debuginfo.repo
-rw-r--r--. 1 root root  314 Apr 28  2018 CentOS-fasttrack.repo
-rw-r--r--. 1 root root  630 Apr 28  2018 CentOS-Media.repo
-rw-r--r--. 1 root root 1331 Apr 28  2018 CentOS-Sources.repo
-rw-r--r--. 1 root root 4768 Apr 28  2018 CentOS-Vault.repo

（ Two ） Back up the original file

[[email protected] yum.repos.d]# mv CentOS-Base.repo CentOS-Base.repo.bak

（ 3、 ... and ） establish Centos-Base.repo file

[[email protected] yum.repos.d]# touch CentOS-Base.repo

（ Four ） Visit Tsinghua source ：https://mirrors.tuna.tsinghua.edu.cn/ , find centos, Click next to 【 question mark 】
（ 5、 ... and ） Modify according to the help

（ 6、 ... and ） You can see base How many sources are available

[[email protected] yum.repos.d]# yum repolist

（ 7、 ... and ） Test success

（before） At present, there is no vim Ordered by

（after）

Last tip ：complete！

When the input vim You can use the command of

[[email protected] yum.repos.d]# vim CentOS-Base.repo.bak