mysql does not start on ubuntu 18.4 - php

Question

My website is running on docker container, which is working fine. I am trying to connect my online website's database with admin panel on local host. So I was trying to enable remote access to mysql database server. For that I added some changes in /etc/mysql/my.cnf file and on restarting mysql service I've got this error.
I think I have error in starting MYSQL COMMUNITY SERVER.
Job for mysql.service failed because the control process exited with error code.
See "systemctl status mysql.service" and "journalctl -xe" for details.
and after running systemctl status mysql.service, I get this result
mysql.service - MySQL Community Server
Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Wed 2019-10-02 13:43:29 UTC; 40min ago
Process: 26628 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=1/FAILURE)
Oct 02 13:43:29 ip-172-31-31-42 systemd[1]: mysql.service: Control process exited, code=exited status=1
Oct 02 13:43:29 ip-172-31-31-42 systemd[1]: mysql.service: Failed with result 'exit-code'.
Oct 02 13:43:29 ip-172-31-31-42 systemd[1]: Failed to start MySQL Community Server.
Oct 02 13:43:29 ip-172-31-31-42 systemd[1]: mysql.service: Service hold-off time over, scheduling restart.
Oct 02 13:43:29 ip-172-31-31-42 systemd[1]: mysql.service: Scheduled restart job, restart counter is at 5.
Oct 02 13:43:29 ip-172-31-31-42 systemd[1]: Stopped MySQL Community Server.
Oct 02 13:43:29 ip-172-31-31-42 systemd[1]: mysql.service: Start request repeated too quickly.
Oct 02 13:43:29 ip-172-31-31-42 systemd[1]: mysql.service: Failed with result 'exit-code'.
Oct 02 13:43:29 ip-172-31-31-42 systemd[1]: Failed to start MySQL Community Server.
-- Subject: Unit mysql.service has finished shutting down
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit mysql.service has finished shutting down.
Oct 02 14:24:59 ip-172-31-31-42 systemd[1]: mysql.service: Start request repeate
Oct 02 14:24:59 ip-172-31-31-42 systemd[1]: mysql.service: Failed with result 'e
Oct 02 14:24:59 ip-172-31-31-42 systemd[1]: Failed to start MySQL Community Serv
-- Subject: Unit mysql.service has failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit mysql.service has failed.
--
-- The result is RESULT.
what could be the possible solution?
I have already tried the all other alternative commands to start mysql server but nothing works out.
This is error message I'm getting in my console.
Job for mysql.service failed because the control process exited with error code.
See "systemctl status mysql.service" and "journalctl -xe" for details.