报错原文
Key imported successfully
Import of key(s) didn't help, wrong key(s)?
Public key for mysql-community-client-5.7.37-1.el7.x86_64.rpm is not installed. Failing package is: mysql-community-client-5.7.37-1.el7.x86_64
GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Public key for mysql-community-common-5.7.37-1.el7.x86_64.rpm is not installed. Failing package is: mysql-community-common-5.7.37-1.el7.x86_64
GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Public key for mysql-community-libs-5.7.37-1.el7.x86_64.rpm is not installed. Failing package is: mysql-community-libs-5.7.37-1.el7.x86_64
GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Public key for mysql-community-server-5.7.37-1.el7.x86_64.rpm is not installed. Failing package is: mysql-community-server-5.7.37-1.el7.x86_64
GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing 'yum clean packages'.
Error: GPG check FAILED
失败原因
GPG对于包的源key的验证没有通过
解决办法
在yum install 版本后面加上 --nogpgcheck，即可绕过GPG验证成功安装。比如
yum install mysql-community-server --nogpgcheck
