MySQL service unable to start...

Hi,

I’m getting an “Error establishing a database connection” in WordPress, and on further inspection it looks like the MySQL service isnt running.

When I try and run sudo service mysql start, I get:

Job for mysql.service failed. See 'systemctl status mysql.service' and 'journalctl -xn' for details.

If I run systemctl status mysql.service I get:

Loaded: loaded (/etc/init.d/mysql)
   Active: failed (Result: exit-code) since Mon 2019-06-03 09:00:20 UTC; 18s ago
  Process: 936 ExecStart=/etc/init.d/mysql start (code=exited, status=1/FAILURE)

running sudo journalctl -xn gives me:

-- Logs begin at Mon 2019-06-03 08:58:05 UTC, end at Mon 2019-06-03 09:09:21 UTC. --
Jun 03 09:09:01 roofingsheetsbyrhino cron[509]: Authentication token is no longer valid; new one required
Jun 03 09:09:01 roofingsheetsbyrhino cron[509]: Authentication token is no longer valid; new one required
Jun 03 09:09:09 roofingsheetsbyrhino sshd[991]: Invalid user share123 from 106.12.24.108
Jun 03 09:09:09 roofingsheetsbyrhino sshd[991]: input_userauth_request: invalid user share123 [preauth]
Jun 03 09:09:09 roofingsheetsbyrhino sshd[991]: pam_unix(sshd:auth): check pass; user unknown
Jun 03 09:09:09 roofingsheetsbyrhino sshd[991]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.12.24.108
Jun 03 09:09:10 roofingsheetsbyrhino sshd[991]: Failed password for invalid user share123 from 106.12.24.108 port 55360 ssh2
Jun 03 09:09:11 roofingsheetsbyrhino sshd[991]: Received disconnect from 106.12.24.108: 11: Bye Bye [preauth]
Jun 03 09:09:21 roofingsheetsbyrhino sudo[993]: tom : TTY=pts/0 ; PWD=/var/www ; USER=root ; COMMAND=/bin/journalctl -xn
Jun 03 09:09:21 roofingsheetsbyrhino sudo[993]: pam_unix(sudo:session): session opened for user root by tom(uid=0)

I’m really not sure what the issue is here, or how this has come about - any advice as to what I should do next would be hugely appreciated!

Thanks!