I'm having a bad day trying to find the reason why this bug is occurring to me.
when I run the express.js app (using pm2) it makes MySQL 5.7 server stop and when I try to restart the MySQL server it outputs an error.
Bear in mind that the express.js app is running on port 80 and MySQL is running on port 3306. and that the express.js app is not trying to talk or connect to MySQL in any ways so they shouldn't interact with each other.
Platform: Digital Ocean, OS: Ubuntu 16.04, Node Version: 8.2.1, MySQL Version: 5.7
`journalctl -xe` output :
-- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- Unit mysql.service has begun starting up. Aug 07 19:37:35 ubuntu-512mb-lon1-01 systemd[1]: mysql.service: Main process exited, code=exited, status=1/FAILURE Aug 07 19:37:49 ubuntu-512mb-lon1-01 sshd[20843]: Invalid user db2fenc1 from xxxxxx Aug 07 19:37:49 ubuntu-512mb-lon1-01 sshd[20843]: input_userauth_request: invalid user db2fenc1 [preauth] Aug 07 19:37:49 ubuntu-512mb-lon1-01 sshd[20843]: pam_unix(sshd:auth): check pass; user unknown Aug 07 19:37:49 ubuntu-512mb-lon1-01 sshd[20843]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=xxxx. Aug 07 19:37:51 ubuntu-512mb-lon1-01 sshd[20843]: Failed password for invalid user db2fenc1 from xxxxxx port 60654 ssh2 Aug 07 19:37:51 ubuntu-512mb-lon1-01 sshd[20843]: Received disconnect from xxxxx port 60654:11: Normal Shutdown, Thank you for playing [preau Aug 07 19:37:51 ubuntu-512mb-lon1-01 sshd[20843]: Disconnected from xxxxx port 60654 [preauth] Aug 07 19:38:05 ubuntu-512mb-lon1-01 systemd[1]: Failed to start MySQL Community Server. -- Subject: Unit mysql.service has failed -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- Unit mysql.service has failed. -- The result is failed. Aug 07 19:38:05 ubuntu-512mb-lon1-01 systemd[1]: mysql.service: Unit entered failed state. Aug 07 19:38:05 ubuntu-512mb-lon1-01 systemd[1]: mysql.service: Failed with result 'exit-code'. Aug 07 19:38:05 ubuntu-512mb-lon1-01 systemd[1]: mysql.service: Service hold-off time over, scheduling restart. Aug 07 19:38:05 ubuntu-512mb-lon1-01 systemd[1]: Stopped MySQL Community Server. -- Subject: Unit mysql.service has finished shutting down -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- Unit mysql.service has finished shutting down. Aug 07 19:38:05 ubuntu-512mb-lon1-01 systemd[1]: Starting MySQL Community Server... -- Subject: Unit mysql.service has begun start-up -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- Unit mysql.service has begun starting up. Aug 07 19:38:05 ubuntu-512mb-lon1-01 systemd[1]: mysql.service: Main process exited, code=exited, status=1/FAILURE
