国内yum源的安装(163，阿里云，epel)

----阿里云镜像源

1、备份

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

2、下载新的CentOS-Base.repo到/etc/yum.repos.d/

CentOS 5

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo

或者

curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo

CentOS 6

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo

curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo

CentOS 7

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

3、之后运行yum clean all，yum makecache生成缓存

----163镜像源

第一步：备份你的原镜像文件，以免出错后可以恢复。

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup第二步：下载新的CentOS-Base.repo到/etc/yum.repos.d/

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS5-Base-163.repo

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS6-Base-163.repo

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo

3、之后运行yum clean all，yum makecache生成缓存

----EPEL源

EPEL（Extra Packages for Enterprise Linux）是由Fedora社区打造，为RHEL及衍生发行版如CentOS等提供高质量软件包的项目。装上了EPEL，就像在Fedora上一样，可以通过yum install软件包名，即可安装很多以前需要编译安装的软件、常用的软件或一些比较流行的软件，比如现在流行的Nginx、htop、ncdu、vnstat等等，都可以使用EPEL很方便的安装更新。

目前可以直接通过执行命令：yum install epel-release直接进行安装，如果此命令无法安装可以尝试以下方法

----安装EPEL阿里云源

1、备份(如有配置其他epel源)

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

2、下载新repo到/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.repohttp://mirrors.aliyun.com/repo/epel-5.repo

----官方源直接安装

CentOS/RHEL5：

rpm -Uvhhttps://dl.fedoraproject.org/pub/epel/epel-release-latest-5.noarch.rpm

CentOS/RHEL 6rpm -Uvhhttps://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm

CentOS/RHEL 7rpm -Uvhhttps://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm