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Public key for mysql-community-libs-5.7.44-1.el7.x86_64.rpm is not installedFailing package is: mysql-community-libs-5.7.44-1.el7.x86_64GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

解决：MySQL在8以后sql_mode已经取消了NO_AUTO_CREATE_USER这个关键字。去掉这个关键字后，重启成功！在日志里也没有找到有用的信息，但将此项配置去掉，MySQL便可正常启动。MySQL在my.cnf加上sql_mode后无法启动。下面这个配置才是可以正常启动的哦。

在CentOS 7上安装MySQL时遇到错误：Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2022GPG key retrieval failed: [Errno 14] curl#37 - "Couldn't open file /etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2022"需要先运行下面的命令rpm --import https://repo.mysql.com/RPM-GPG-KEY-