centos 更换源之后出现yum下载失败问题
今天在更换了物理机centos的源之后，yum下载其他软件的时候失败了，同时出现了下面的错误。
Downloading packages: warning: /var/cache/yum/x86_64/7/extras/packages/epel-release-7-9.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY`这里写代码片` Retrieving key from http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6 The GPG keys listed for the "CentOS-7 - Extras - 163.com" repository are already installed but they are not correct for this package. Check that the correct key URLs are configured for this repository. Failing package is: epel-release-7-9.noarch GPG Keys are configured as: http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
google之后是yum源更新后需要导入 key值，否则就会报上面的错误，无法安装相关的包。 这里的解决办法是加上“–nogpgcheck”就可以了，即去掉gpg检查，然后重新下载epel源
yum install epel-release --nogpgcheck
问题解决。
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