centos安装mysql8遇到的几个问题
问题1：
Another app is currently holding the yum lock; waiting for it to exit...
The other application is: yum
Memory : 111 M RSS (432 MB VSZ)
Started: Wed May 17 20:21:48 2023 - 12:02 ago
State : Sleeping, pid: 15445
输入：
rm -f /var/run/yum.pid
然后重新运行刚才的yum命令即可
问题2：
Public key for mysql-community-common-8.0.33-1.el7.x86_64.rpm is not installed
Failing package is: mysql-community-common-8.0.33-1.el7.x86_64
GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
原因及解决：
原因是Mysql的GPG升级了，需要重新获取
使用以下命令即可
rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022
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