【问题】
当通过 yum 升级 CentOS系统时，报错：
warning: /var/cache/yum/x86_64/7/city-fan.org/packages/sendmail-8.17.2-4.1.cf.rh el7.x86_64.rpm: Header V4 RSA/SHA256 Signature, key ID 98661eb8: NOKEY Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-city-fan.org The GPG keys listed for the "city-fan.org repository for Red Hat Enterprise Linu x (and clones) 7 (x86_64)" repository are already installed but they are not cor rect for this package. Check that the correct key URLs are configured for this repository. Failing package is: sendmail-8.17.2-4.1.cf.rhel7.x86_64 GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-city-fan.org
【方案】
rpm --import /etc/pki/rpm-gpg/RPM*