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安装环境：

阿里云主机：Centos 6.5  32位

错误提示：

Retrieving http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
warning: /var/tmp/rpm-tmp.AJP4bM: Header V3 DSA/SHA1 Signature, key ID 00f97f56: NOKEY
error: Failed dependencies:
epel-release >= 6 is needed by remi-release-6.5-1.el6.remi.noarch

原因：未安装epel软件库解决：1、下载EPEL 的rpm 安装包

wget http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm

2. 安装EPEL通过以下命令安装EPEL 软件包

sudo rpm -ivh epel-release-6-8.noarch.rpm

3. 检查EPEL 源安装好EPEL 源后，用yum 命令来检查是否添加到源列表

# yum repolist
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.vonline.v
* epel: buaya.klas.or.id
* extras: centos-hn.viettelidc.com.vn
* updates: mirrors.fibo.vn
repo id repo name status
base CentOS-6 – Base 6,381
epel Extra Packages for Enterprise Linux 6 – x86_64 10,023
extras CentOS-6 – Extras 13
nginx nginx repo 47 updates CentOS-6 –
Updates 1,555
repolist: 18,019

EPEL已经在repo 后列出，并且显示提供了上万个软件包，所以EPEL 已经安装到你的CentOS了。