Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2)

Redirecting to /bin/systemctl restart  mysqld.service
Job for mysqld.service failed because the control process exited with error code. See “systemctl status mysqld.service” and “journalctl -xe” for details.

通过查看日志发现临时文件的权限不够，修改临时目录，在[mysqld]标签下添加

vim /etc/my.cnf
tmpdir=/var/lib/mysql