1.安装 CentOS-Base 国内源
备份旧的配置文件
mv CentOS-Base.repo CentOS-Base.repo.bak
使用 aliyun
# CentOS 7 / RHEL 7
wget -O CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
# CentOS 6 / RHEL 6
wget -O CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
使用 163
#CentOS 7 / RHEL 7
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo
#CentOS 6 / RHEL 6
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS6-Base-163.repo
2. 安装 EPEL 源：
企业版 Linux 附加软件包(以下简称 EPEL)是一个由特别兴趣小组创建、维护并管理的，针对 红帽企业版 Linux(RHEL)及其衍生发行版(比如 CentOS、Scientific Linux、Oracle Enterprise Linux)的一个高质量附加软件包项目。
EPEL 的软件包通常不会与企业版 Linux 官方源中的软件包发生冲突，或者互相替换文件。EPEL 项目与 Fedora
基本一致，包含完整的构建系统、升级管理器、镜像管理器等等。
上海交大
# CentOS 7 / RHEL 7
yum install http://ftp.sjtu.edu.cn/fedora/epel/7/x86_64/e/epel-release-7-10.noarch.rpm
# CentOS 6 / RHEL 6
yum install http://ftp.sjtu.edu.cn/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm
Aliyun
# CentOS 7 / RHEL 7
yum install http://mirrors.aliyun.com/repo/epel-7.repo
# CentOS 6 / RHEL 6
yum install http://mirrors.aliyun.com/repo/epel-6.repo
浙大源
# CentOS 7 / RHEL 7
yum install http://mirrors.zju.edu.cn/epel/epel-release-latest-7.noarch.rpm
# CentOS 6 / RHEL 6
yum install http://mirrors.zju.edu.cn/epel/epel-release-latest-6.noarch.rpm
东软源
# CentOS 7 / RHEL 7
yum install http://mirrors.neusoft.edu.cn/epel/epel-release-latest-7.noarch.rpm
# CentOS 6 / RHEL 6
yum install http://mirrors.neusoft.edu.cn/epel/epel-release-latest-6.noarch.rpm
Sohu
# CentOS 7 / RHEL 7
yum install http://mirrors.sohu.com/fedora-epel/epel-release-latest-7.noarch.rpm
# CentOS 6 / RHEL 6
yum install http://mirrors.sohu.com/fedora-epel/epel-release-latest-6.noarch.rpm
配置EPEL源
vi /etc/yum.repos.d/epel.repo
[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
baseurl=http://ftp.sjtu.edu.cn/fedora/epel/7/$basearch
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearch
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
[epel-debuginfo]
name=Extra Packages for Enterprise Linux 7 - $basearch - Debug
baseurl=http://ftp.sjtu.edu.cn/fedora/epel/7/$basearch/debug
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-debug-7&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=1
[epel-source]
name=Extra Packages for Enterprise Linux 7 - $basearch - Source
baseurl=http://ftp.sjtu.edu.cn/fedora/epel/7/SRPMS
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-source-7&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=1
vi /etc/yum.repos.d/epel-testing.repo
[epel-testing]
name=Extra Packages for Enterprise Linux 7 - Testing - $basearch
baseurl=http://ftp.sjtu.edu.cn/fedora/epel/testing/7/$basearch
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=testing-epel7&arch=$basearch
failovermethod=priority
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
[epel-testing-debuginfo]
name=Extra Packages for Enterprise Linux 7 - Testing - $basearch - Debug
baseurl=http://ftp.sjtu.edu.cn/fedora/epel/testing/7/$basearch/debug
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=testing-debug-epel7&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=1
[epel-testing-source]
name=Extra Packages for Enterprise Linux 7 - Testing - $basearch - Source
baseurl=http://ftp.sjtu.edu.cn/fedora/epel/testing/7/SRPMS
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=testing-source-epel7&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=1
这是已经替换好上海交大源的文件，如果想使用中科大的，请用http://mirrors.ustc.edu.cn/来替换http://ftp.sjtu.edu.cn/fedora/就可。其它以此类推。
3. 添加 remi 源
Remi repository 是包含最新版本 PHP 和 MySQL 包的 Linux 源，由 Remi 提供维护。有个这个源之后，使用
YUM 安装或更新 PHP、MySQL、phpMyAdmin 等服务器相关程序的时候就非常方便了。他会自动安装 epel 作为依赖。
# CentOS 7 / RHEL 7
yum install http://rpms.famillecollet.com/enterprise/remi-release-7.rpm
# CentOS 6 / RHEL 6
yum install http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
yum安装MySQL 5.5看看：
yum --enablerepo=remi install mysql mysql-server
如果是升级MySQL，请用：
yum --enablerepo=remi update mysql mysql-server
4. 检查源是否已添加
yum repolist
5. 清理 并 重新生成缓存
yum clean all && yum makecache
