mysql 8.0.12 修改默认端口的坑

示例：修改默认端口3306为3308
1.编辑配置文件my.cnf

vim /etc/my.cnf

2.加入内容port=3308

1.png

3.重启mysqld

systemctl restart mysqld

结果发现启动失败

2.png

查看日志内容mysqld.log

vim /var/log/mysqld.log

发现以下内容

2018-10-17T15:44:56.581810Z 0 [ERROR] [MY-010262] [Server] Can't start server: Bind on TCP/IP port: Permission denied
2018-10-17T15:44:56.581831Z 0 [ERROR] [MY-010257] [Server] Do you already have another mysqld server running on port: 3308 ?
2018-10-17T15:44:56.581877Z 0 [ERROR] [MY-010119] [Server] Aborting

简单粗暴的解决办法：关掉selinux，重启mysqld就可以了

/usr/sbin/setenforce 0
systemctl restart mysqld