安装了elrepo.org提供的rpm包后，就几乎可以安装centos下的所有的程序了

Enterprise Linux Repository.
Welcome to ELRepo, an RPM repository for Enterprise Linux packages. ELRepo supports Red Hat Enterprise Linux (RHEL) and its derivatives (Scientific Linux, CentOS & others).

Import the public key:

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org

Detailed info on the GPG key used by the ELRepo Project can be found on https://www.elrepo.org/tiki/key
If you have a system with Secure Boot enabled, please see the SecureBootKey page for more information.

To install ELRepo for RHEL-7, SL-7 or CentOS-7:

rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm

To make use of our mirror system, please also install yum-plugin-fastestmirror.

To install ELRepo for RHEL-6, SL-6 or CentOS-6:

rpm -Uvh http://www.elrepo.org/elrepo-release-6-6.el6.elrepo.noarch.rpm

To make use of our mirror system, please also install yum-plugin-fastestmirror.

To install ELRepo for RHEL-5, SL-5 or CentOS-5:

rpm -Uvh http://www.elrepo.org/elrepo-release-5-5.el5.elrepo.noarch.rpm

To make use of our mirror system, please also install yum-fastestmirror.

from  http://elrepo.org/tiki/tiki-index.php
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再也不会提示没这个package,没那个package.