centos6添加第三方源
EPEL源
EPEL,即Extra Packages for Enterprise Linux,是由 Fedora 社区创建维护，为 RHEL 及衍生发行版如 CentOS、Scientific Linux 等提供高质量软件包的项目。EPEL中含有大量的软件，对官方标准源是一个很好的补充。
“EPEL (Extra Packages for Enterprise Linux ) is a Fedora Special Interest Group that creates, maintains, and manages a high quality set of additional packages for Enterprise Linux, including, but not limited to, Red Hat Enterprise Linux (RHEL), CentOS and Scientific Linux (SL).”
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