问题
    使用下面命令安装MySQL没有安装成功
    yum -y install mysql-community-server

    1. Public key for mysql-community-server-5.7.37-1.el7.x86_64.rpm is not installed
    4.  Failing package is: mysql-community-server-5.7.37-1.el7.x86_64
    5.  GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

    解决
    在后面加上 —nogpgcheck
    yum -y install mysql-community-server —nogpgcheck