[笔记]CentOS如何启用单一的yum源

用法：
yum --disablerepo=reponame # 禁用源
yum --enablerepo=reponame # 启用源

# 以使用本地yum源安装php为例

# 查看可用的源
[test@localhost ~]$ yum repolist
Loaded plugins: fastestmirror, security
Determining fastest mirrors
.....省略....
repo id repo name status
base CentOS-6 - Base 6,696
c6-media CentOS-6 - Media 6,575
extras CentOS-6 - Extras 60
updates CentOS-6 - Updates 94
repolist: 13,425

# 只是用本地yum源来安装
[test@localhost etc]$ sudo yum --disablerepo='*' --enablerepo=c6-media install php
Loaded plugins: fastestmirror, security
Setting up Install Process
Loading mirror speeds from cached hostfile
* c6-media: <--------注意
Resolving Dependencies
--> Running transaction check
# 以上还可写作
[test@localhost etc]$ sudo yum --disablerepo=* --enablerepo=c6-media install php
Loaded plugins: fastestmirror, security
Setting up Install Process
Loading mirror speeds from cached hostfile
* c6-media: <--------注意与之前输出的区别
Resolving Dependencies
--> Running transaction check

# 除了指定的源，其他存在的源也会启用
[test@localhost etc]$ sudo yum --enablerepo=c6-media install php
[sudo] password for test:
Loaded plugins: fastestmirror, security
Setting up Install Process
Loading mirror speeds from cached hostfile
* base: mirrors.yun-idc.com <------注意与之前输出的区别
* c6-media:
* extras: mirrors.yun-idc.com
* updates: mirrors.yun-idc.com
Resolving Dependencies
--> Running transaction check

# 所有的源都被禁用
[test@localhost etc]$ sudo yum --disablerepo='*' install php
Loaded plugins: fastestmirror, security
Setting up Install Process
Loading mirror speeds from cached hostfile
No package php available. <------注意与之前输出的区别
Error: Nothing to do