warning: /var/cache/XXXX.rpm: Header V4 RSA/SHA256

报错

warning: /var/cache/yum/x86_64/7/mysql57-community/packages/mysql-community-client-5.7.39-1.el7.x86_64.rpm: Header V4 RSA/SHA256 Signature, key ID 3a79bd29: NOKEY
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

The GPG keys listed for the "MySQL 8.0 Community Server" 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: mysql-community-client-8.0.28-1.el7.x86_64
GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

解决
禁掉GPG验证检查

--nogpgcheck