无法启动 MySQL 服务器，无法启动 LSB：启动和停止 MySQL

Question

My database stoped working today and I can't figure out why, the only response it gives me is:

● mysqld.service - LSB: start and stop MySQL
     Loaded: loaded (/etc/init.d/mysqld; generated)
     Active: failed (Result: exit-code) since Tue 2022-08-16 17:31:24 UTC; 30s ago
       Docs: man:systemd-sysv-generator(8)
    Process: 4680 ExecStart=/etc/init.d/mysqld start (code=exited, status=1/FAILURE)

Aug 16 17:31:21 kdymsolucoes.dev.br systemd[1]: Starting LSB: start and stop MySQL...
Aug 16 17:31:24 kdymsolucoes.dev.br mysqld[4680]: Starting MySQL... * The server quit without updating PID file (/www/server/data/kdymsolucoes.dev.br.pid).
Aug 16 17:31:24 kdymsolucoes.dev.br systemd[1]: mysqld.service: Control process exited, code=exited, status=1/FAILURE
Aug 16 17:31:24 kdymsolucoes.dev.br systemd[1]: mysqld.service: Failed with result 'exit-code'.
Aug 16 17:31:24 kdymsolucoes.dev.br systemd[1]: Failed to start LSB: start and stop MySQL.

I have restarted the server, reinstalled it, but nothing seems to work.

Here is the output of journalctl -xe :

-- An ExecStart= process belonging to unit mysqld.service has exited.
--
-- The process' exit code is 'exited' and its exit status is 1.
Aug 16 17:31:24 kdymsolucoes.dev.br systemd[1]: mysqld.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit mysqld.service has entered the 'failed' state with result 'exit-code'.
Aug 16 17:31:24 kdymsolucoes.dev.br systemd[1]: Failed to start LSB: start and stop MySQL.
-- Subject: A start job for unit mysqld.service has failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A start job for unit mysqld.service has finished with a failure.
--
-- The job identifier is 1593 and the job result is failed.
Aug 16 17:31:58 kdymsolucoes.dev.br sshd[5471]: Invalid user jake from 113.57.170.50 port 37434
Aug 16 17:31:58 kdymsolucoes.dev.br sshd[5471]: pam_unix(sshd:auth): check pass; user unknown
Aug 16 17:31:58 kdymsolucoes.dev.br sshd[5471]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=113.57.170.50
Aug 16 17:32:01 kdymsolucoes.dev.br CRON[5475]: pam_unix(cron:session): session opened for user root by (uid=0)
Aug 16 17:32:01 kdymsolucoes.dev.br CRON[5476]: (root) CMD (/root/-)
Aug 16 17:32:01 kdymsolucoes.dev.br sendmail[5477]: 27GHW1nS005477: from=root, size=324, class=0, nrcpts=1, msgid=<202208161732.27GHW1nS005477@kdymsolucoes.d>Aug 16 17:32:01 kdymsolucoes.dev.br sm-mta[5478]: 27GHW1Fv005478: from=<root@kdymsolucoes.dev.br>, size=600, class=0, nrcpts=1, msgid=<202208161732.27GHW1nS0>Aug 16 17:32:01 kdymsolucoes.dev.br sendmail[5477]: 27GHW1nS005477: to=root, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30324, re>Aug 16 17:32:01 kdymsolucoes.dev.br CRON[5475]: pam_unix(cron:session): session closed for user root
Aug 16 17:32:01 kdymsolucoes.dev.br sshd[5471]: Failed password for invalid user jake from 113.57.170.50 port 37434 ssh2
Aug 16 17:32:01 kdymsolucoes.dev.br sm-mta[5479]: 27GHW1Fv005478: to=<root@kdymsolucoes.dev.br>, ctladdr=<root@kdymsolucoes.dev.br> (0/0), delay=00:00:00, xd>Aug 16 17:32:03 kdymsolucoes.dev.br sshd[5471]: Received disconnect from 113.57.170.50 port 37434:11: Bye Bye [preauth]
Aug 16 17:32:03 kdymsolucoes.dev.br sshd[5471]: Disconnected from invalid user jake 113.57.170.50 port 37434 [preauth]
Aug 16 17:33:01 kdymsolucoes.dev.br CRON[5572]: pam_unix(cron:session): session opened for user root by (uid=0)
Aug 16 17:33:01 kdymsolucoes.dev.br CRON[5573]: (root) CMD (/root/-)
Aug 16 17:33:01 kdymsolucoes.dev.br sendmail[5574]: 27GHX1g2005574: from=root, size=324, class=0, nrcpts=1, msgid=<202208161733.27GHX1g2005574@kdymsolucoes.d>Aug 16 17:33:01 kdymsolucoes.dev.br sm-mta[5576]: 27GHX1kx005576: from=<root@kdymsolucoes.dev.br>, size=600, class=0, nrcpts=1, msgid=<202208161733.27GHX1g20>Aug 16 17:33:01 kdymsolucoes.dev.br sendmail[5574]: 27GHX1g2005574: to=root, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30324, re>Aug 16 17:33:01 kdymsolucoes.dev.br CRON[5572]: pam_unix(cron:session): session closed for user root
Aug 16 17:33:01 kdymsolucoes.dev.br sm-mta[5577]: 27GHX1kx005576: to=<root@kdymsolucoes.dev.br>, ctladdr=<root@kdymsolucoes.dev.br> (0/0), delay=00:00:00, xd>Aug 16 17:33:14 kdymsolucoes.dev.br sshd[5586]: Invalid user server from 223.75.51.167 port 45114
Aug 16 17:33:14 kdymsolucoes.dev.br sshd[5586]: pam_unix(sshd:auth): check pass; user unknown
Aug 16 17:33:14 kdymsolucoes.dev.br sshd[5586]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=223.75.51.167
Aug 16 17:33:16 kdymsolucoes.dev.br sshd[5586]: Failed password for invalid user server from 223.75.51.167 port 45114 ssh2
Aug 16 17:33:16 kdymsolucoes.dev.br sshd[5586]: Received disconnect from 223.75.51.167 port 45114:11: Bye Bye [preauth]
Aug 16 17:33:16 kdymsolucoes.dev.br sshd[5586]: Disconnected from invalid user server 223.75.51.167 port 45114 [preauth]
Aug 16 17:34:01 kdymsolucoes.dev.br CRON[5588]: pam_unix(cron:session): session opened for user root by (uid=0)
Aug 16 17:34:01 kdymsolucoes.dev.br CRON[5589]: (root) CMD (/root/-)
Aug 16 17:34:01 kdymsolucoes.dev.br sendmail[5590]: 27GHY1sZ005590: from=root, size=324, class=0, nrcpts=1, msgid=<202208161734.27GHY1sZ005590@kdymsolucoes.d>Aug 16 17:34:01 kdymsolucoes.dev.br sm-mta[5591]: 27GHY1WQ005591: from=<root@kdymsolucoes.dev.br>, size=600, class=0, nrcpts=1, msgid=<202208161734.27GHY1sZ0>Aug 16 17:34:01 kdymsolucoes.dev.br sendmail[5590]: 27GHY1sZ005590: to=root, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30324, re>Aug 16 17:34:01 kdymsolucoes.dev.br CRON[5588]: pam_unix(cron:session): session closed for user root
Aug 16 17:34:01 kdymsolucoes.dev.br sm-mta[5592]: 27GHY1WQ005591: to=<root@kdymsolucoes.dev.br>, ctladdr=<root@kdymsolucoes.dev.br> (0/0), delay=00:00:00, xd>Aug 16 17:34:36 kdymsolucoes.dev.br sshd[5600]: Invalid user ubuntu from 223.75.51.167 port 17031
Aug 16 17:34:36 kdymsolucoes.dev.br sshd[5600]: pam_unix(sshd:auth): check pass; user unknown
Aug 16 17:34:36 kdymsolucoes.dev.br sshd[5600]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=223.75.51.167
Aug 16 17:34:37 kdymsolucoes.dev.br sshd[5600]: Failed password for invalid user ubuntu from 223.75.51.167 port 17031 ssh2
Aug 16 17:34:39 kdymsolucoes.dev.br sshd[5600]: Received disconnect from 223.75.51.167 port 17031:11: Bye Bye [preauth]
Aug 16 17:34:39 kdymsolucoes.dev.br sshd[5600]: Disconnected from invalid user ubuntu 223.75.51.167 port 17031 [preauth]

It just gives me the same output from the status command.

Answer 1

I was able to solve this problem with a backup that I had from 8 days ago. I downloaded the files from /var/lib/mysql and copied to the backup that has a working mysql server. I had to solve several errors and permissions, but was able to solve them by checking /var/log/mysql/errors.log constantly.

Thanks @halfer to helping me find the way to do it