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Couldn't open file /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7

CentOS7安装任何软件，比如

yum -y install ansible

出现错误信息：

Couldn‘t open file /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7

名词解释：

EPEL：extra packages for enterprise linux.

一般情况下用不到EPEL，直接disable这个功能。

vi /etc/yum.repos.d/epel.repo

修改前：

[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
#baseurl=http://download.fedoraproject.org/pub/epel/7/$basearch
mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearch
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7

修改后：

[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
#baseurl=http://download.fedoraproject.org/pub/epel/7/$basearch
mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearch
failovermethod=priority
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7

重新yum -y install ansible,解决。

文章来自：http://www.cnblogs.com/flasheryu/p/5873081.html