安装完成后几个报错之一，解决办法如下：
1. 输入ps -ef | grep mysqld查看进程
用kill -9 2405 杀掉已存在进程
输入service mysqld start重启服务
2.mysql权限问题
安装文件增加权限及修改用户/用户组
3.关闭SELinux
关闭SELinux，配置SELINUX=disabled
重启设备后SELinux永久关闭
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