腾讯轻云CentOS7更换源

腾讯自家的源少一些东西，换！
yum的配置文件
yum 的配置文件在 /etc/yum.repos.d 目录下,
其中有多个配置文件,每一个配置文件中都可以配置一个或多个repository,
但是最终会被合并为一个交给系统，所以多个文件只是为了方便管理。

先清理下 /etc/yum.repos.d 目录 把里面的内容删光。

1. 先进入文件夹看看里面的东西多不
   
2. cd /etc/yum.repos.d
   
3. 在删除yum.repos.d里的所有东西
   
4. rm -rf *

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新建.repo

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

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内容为

1. 
   
2. # CentOS-Base.repo
   
3. #
   
4. # The mirror system uses the connecting IP address of the client and the
   
5. # update status of each mirror to pick mirrors that are updated to and
   
6. # geographically close to the client.  You should use this for CentOS updates
   
7. # unless you are manually picking other mirrors.
   
8. #
   
9. # If the mirrorlist= does not work for you, as a fall back you can try the
   
10. # remarked out baseurl= line instead.
    
11. #
    
12. #
    
13. 
    
14. [base]
    
15. name=CentOS-$releasever - Base
    
16. baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/os/$basearch/
    
17. #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
    
18. gpgcheck=1
    
19. gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
    
20. 
    
21. #released updates
    
22. [updates]
    
23. name=CentOS-$releasever - Updates
    
24. baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/updates/$basearch/
    
25. #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
    
26. gpgcheck=1
    
27. gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
    
28. 
    
29. #additional packages that may be useful
    
30. [extras]
    
31. name=CentOS-$releasever - Extras
    
32. baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/extras/$basearch/
    
33. #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
    
34. gpgcheck=1
    
35. gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
    
36. 
    
37. #additional packages that extend functionality of existing packages
    
38. [centosplus]
    
39. name=CentOS-$releasever - Plus
    
40. baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/centosplus/$basearch/
    
41. #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
    
42. gpgcheck=1
    
43. enabled=0
    
44. gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
    

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3、epel源 安装和配置
（1）、可忽略 查看可用的epel源

1. yum list | grep epel-release

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显示内容为 ：epel-release.noarch                         7-11                       extras   

（2）、安装 epel

1. yum install -y epel-release

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（3）、配置阿里镜像提供的epel源

1. wget -O /etc/yum.repos.d/epel-7.repo  http://mirrors.aliyun.com/repo/epel-7.repo

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（4）、清除缓存

1. yum clean all     # 清除系统所有的yum缓存
   
2. yum makecache     # 生成yum缓存

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3.1、查看yum源
查看所有的yum源：

1. yum repolist all

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查看可用的yum源：

1. yum repolist enabled

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