yum install git 出现错误，会报错出现类似下面的情况
Setting up Install Process
No package git available.
Nothing to do
原因是因为没有资源文件存在，搜索不到吧，解决办法如下：
需要先添加EPEL(Extra Packages for Enterprise Linux) repository:
CentOS5.x 32-bit(x86/i386):
rpm -Uvh http://dl.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm
CentOS5.x 64-bit(x64):
rpm -Uvh http://dl.fedoraproject.org/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm
CentOS6.x32-bit (x86/i386):
rpm -Uvh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-5.noarch.rpm
CentOS6.x 64-bit(x64):
rpm -Uvh http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-5.noarch.rpm
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