[SOLVED] MYSQL don't start

Issue

Previously I performed the migration of my database from one directory to another within the server itself (/var/lib/mysql to /mnt/mysql) for lack of space.

When starting the server again, after having changed the /etc/my.cnf with the correct directory it returns me this error:

$ systemctl start mysqld

Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.

And when I run the systemctl status command on the mysqld service it returns me:

$ systemctl status mysqld.service

mysqld.service - MySQL Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Ter 2019-07-16 09:34:44 -03; 44s ago
     Docs: man:mysqld(8)
           http://dev.mysql.com/doc/refman/en/using-systemd.html
  Process: 31923 ExecStart=/usr/sbin/mysqld $MYSQLD_OPTS (code=exited, status=1/FAILURE)
  Process: 31899 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
 Main PID: 31923 (code=exited, status=1/FAILURE)
   Status: "SERVER_BOOTING"
    Error: 13 (Permission Denied)

Jul 16 09:34:43 srvepl.cettro.local systemd[1]: Starting MySQL Server...
Jul 16 09:34:44 srvepl.cettro.local systemd[1]: mysqld.service: main process exited, code=exited, status=1/FAILURE
Jul 16 09:34:44 srvepl.cettro.local systemd[1]: Failed to start MySQL Server.
Jul 16 09:34:44 srvepl.cettro.local systemd[1]: Unit mysqld.service entered failed state.
Jul 16 09:34:44 srvepl.cettro.local systemd[1]: mysqld.service failed.

If it is permission error, how do I free the server to accept such a directory?

Note: I am using CentOS 7

Thank you!!

Solution

After searching i discovered that the error was the 'enforcing' permission of SELINUX.

The answer to fix this problem is:

$ sudo setenforce 0

And the server went up normally.

Answered By - Gabriel Castro

Answer Checked By - Senaida (WPSolving Volunteer)