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EPEL是yum的一个软件源,里面包含了许多基本源里没有的软件了，但在我们在使用epel时是需要安装它才可以了.
EPEL，即Extra Packages for Enterprise Linux的简称，是为企业级Linux提供的一组高质量的额外软件包，包括但不限于Red Hat Enterprise Linux (RHEL), CentOS and Scientific Linux (SL), Oracle Enterprise Linux (OEL)。
安装：
*** 环境：CentOS 7 64bit *** [root@localhost ~]# yum -y install epel-release Loaded plugins: fastestmirror, langpacks base | 3.6 kB 00:00:00 extras | 3.4 kB 00:00:00 updates | 3.4 kB 00:00:00 updates/7/x86_64/primary_db | 5.7 MB 00:02:42 Loading mirror speeds from cached hostfile Resolving Dependencies --> Running transaction check ---> Package epel-release.noarch 0:7-6 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================================================================================================================================================== Package Arch Version Repository Size ================================================================================================================================================================================================================== Installing: epel-release noarch 7-6 extras 14 k Transaction Summary ================================================================================================================================================================================================================== Install 1 Package Total download size: 14 k Installed size: 24 k Downloading packages: warning: /var/cache/yum/x86_64/7/extras/packages/epel-release-7-6.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY=========================================== ] 1.2 kB/s | 14 kB 00:00:00 ETA Public key for epel-release-7-6.noarch.rpm is not installed epel-release-7-6.noarch.rpm | 14 kB 00:00:04 Retrieving key from http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7 Importing GPG key 0xF4A80EB5: Userid : "CentOS-7 Key (CentOS 7 Official Signing Key) <security@centos.org>" Fingerprint: 6341 ab27 53d7 8a78 a7c2 7bb1 24c6 a8a7 f4a8 0eb5 From : http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7 Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : epel-release-7-6.noarch 1/1 Verifying : epel-release-7-6.noarch 1/1 Installed: epel-release.noarch 0:7-6 Complete! [root@localhost ~]#
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原文地址：http://www.cnblogs.com/tdcqma/p/5650738.html
