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 - $basearch#baseurl=http://download.fedoraproject.org/pub/epel/7/$basearchmirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearchfailovermethod=priorityenabled=1gpgcheck=1gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7

修改后：

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

 

重新yum -y install ansible,解决。