更改步骤如下：
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.old
cd /etc/yum.repos.d/
wget wget http://linuxlearn.blog.51cto.com/e/u261/themes/default/images/spacer.gifhttp://mirrors.163.com/.help/CentOS6-Base-163.repo
mv CentOS6-Base-163.repo CentOS-Base.repo
yum clean all & yum makecache
yum makecache报错：
http://mirrors.163.com/centos/6/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.old
cd /etc/yum.repos.d/
wget wget http://linuxlearn.blog.51cto.com/e/u261/themes/default/images/spacer.gifhttp://mirrors.163.com/.help/CentOS6-Base-163.repo
mv CentOS6-Base-163.repo CentOS-Base.repo
yum clean all & yum makecache
yum makecache报错：
http://mirrors.163.com/centos/6/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
解决方法为
vi CentOS-Base.repo
替换掉releasever :$s/$releasever/6.6/g
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