CentOS6由于已经停止维护更新，国内所有的镜像源已经停止提供，网上找了很多资料，终于可以正常使用yum了，记录下来以供大家参考。
1、更换/etc/yum.repos.d/CentOS-Base.repo
我的系统为6.4，所以目录版本号为6.4,具体哪个版本的目录名称，可以直接打开网址http://mirrors.aliyun.com/centos-vault/ 查看
[base] name=CentOS-6.4 - Base - mirrors.aliyun.com failovermethod=priority baseurl=http://mirrors.aliyun.com/centos-vault/6.4/os/$basearch/ gpgcheck=1 gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6 #released updates [updates] name=CentOS-6.4 - Updates - mirrors.aliyun.com failovermethod=priority baseurl=http://mirrors.aliyun.com/centos-vault/6.4/updates/$basearch/ gpgcheck=1 gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6 #additional packages that may be useful [extras] name=CentOS-6.4 - Extras - mirrors.aliyun.com failovermethod=priority baseurl=http://mirrors.aliyun.com/centos-vault/6.4/extras/$basearch/ gpgcheck=1 gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6 #additional packages that extend functionality of existing packages [centosplus] name=CentOS-6.4 - Plus - mirrors.aliyun.com failovermethod=priority baseurl=http://mirrors.aliyun.com/centos-vault/6.4/centosplus/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6 #contrib - packages by Centos Users [contrib] name=CentOS-6.4 - Contrib - mirrors.aliyun.com failovermethod=priority baseurl=http://mirrors.aliyun.com/centos-vault/6.4/contrib/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6
2、使用以上配置后，还需要更换/etc/yum.repos.d/epel-6.repl
用于解决当使用yum install 时出现 repodata/repomd.xml: [Errno 12] Timeout 的问题：
repo.webtatic.com 目前还可以使用
[epel]
name=Extra Packages for Enterprise Linux 6 - $basearch
baseurl=http://repo.webtatic.com/yum/el6/$basearch
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=$basearch
failovermethod=priority
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
[epel-debuginfo]
name=Extra Packages for Enterprise Linux 6 - $basearch - Debug
baseurl=http://repo.webtatic.com/yum/el6/$basearch/debug
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-debug-6&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
gpgcheck=0
[epel-source]
name=Extra Packages for Enterprise Linux 6 - $basearch - Source
baseurl=http://mirrors.aliyun.com/epel/6/SRPMS
http://mirrors.aliyuncs.com/epel/6/SRPMS
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-source-6&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
gpgcheck=0
3、php环境配置
/*用于查看可用的php包*/ yum list php* /*安装php*/ yum install php55w php55w-mysql php55w-gd
yum list php* 显示的可以扩展
