CentOS更改yum源与更新系统

#CentOS更改yum源与更新系统

1. 首先备份/etc/yum.repos.d/CentOS-Base.repo
	
	> mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

2. 进入yum源配置文件所在文件夹

 > cd /etc/yum.repos.d/
  
3. 下载163的yum源配置文件，放入/etc/yum.repos.d/(操作前请做好相应备份)，同时
提供sohu源（wget http://mirrors.sohu.com/help/CentOS-Base-sohu.repo）

	>  wget http://mirrors.163.com/.help/CentOS6-Base-163.repo

4. 运行yum makecache生成缓存

	> yum makecache

5. 更新系统

	> yum -y update

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##为CentOS安装EPEL软件仓库

+ EPEL全称: Extra Packages for Enterprise Linux.传说中最全的yum源
+ 通过以下命令安装:
+ CentOS 6.x 32-bit

	  > rpm -Uvh http://mirror.overthewire.com.au/pub/epel/6/i386/epel-release-6-7.noarch.rpm

+ CentOS 6.x 64-bit
  
	  > rpm -Uvh http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-7.noarch.rpm

+ CentOS 5.x 32-bit

	 > rpm -Uvh http://dl.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm

+ CentOS 5.x 64-bit
  
	  > rpm -Uvh http://dl.fedoraproject.org/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm

想暂停使用EPEL，在下面的文件中设置enabled=0即可.

  vim /etc/yum.repos.d/epel.repo