MySql fails to start

Question

Having trouble diagnosing my issue (mysql fails to start). Any help would be greatly appreciated.

Also, this is on Ubuntu 16.04

Step 1 - service mysql start

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

Step 2 - systemctl status mysql.service

mysql.service - MySQL Community Server
   Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
   Active: activating (start-post) (Result: exit-code) since Mon 2016-10-31 22:40:22 UTC; 11s ago
  Process: 9780 ExecStart=/usr/sbin/mysqld (code=exited, status=1/FAILURE)
  Process: 9777 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
 Main PID: 9780 (code=exited, status=1/FAILURE);         : 9781 (mysql-systemd-s)
   CGroup: /system.slice/mysql.service
           └─control
             ├─9781 /bin/bash /usr/share/mysql/mysql-systemd-start post
             └─9806 sleep 1

Step 3 - journalctl -xe

Oct 31 22:42:32 sshd[10033]: Received disconnect from 121.18.238.109 port 34577:11:  [preauth]
Oct 31 22:42:32 sshd[10033]: Disconnected from 121.18.238.109 port 34577 [preauth]
Oct 31 22:42:32 sshd[10033]: PAM 2 more authentication failures; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.18.238.109  user=root
Oct 31 22:42:35 sshd[10090]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=116.31.116.23  user=root
Oct 31 22:42:37 sshd[10090]: Failed password for root from 116.31.116.23 port 52791 ssh2
Oct 31 22:42:39 sshd[10090]: Failed password for root from 116.31.116.23 port 52791 ssh2
Oct 31 22:42:41 sshd[10090]: Failed password for root from 116.31.116.23 port 52791 ssh2
Oct 31 22:42:41 sshd[10090]: Received disconnect from 116.31.116.23 port 52791:11:  [preauth]
Oct 31 22:42:41 sshd[10090]: Disconnected from 116.31.116.23 port 52791 [preauth]
Oct 31 22:42:41 sshd[10090]: PAM 2 more authentication failures; logname= uid=0 euid=0 tty=ssh ruser= rhost=116.31.116.23  user=root
Oct 31 22:42:43 sshd[10084]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.18.238.109  user=root
Oct 31 22:42:45 sshd[10084]: Failed password for root from 121.18.238.109 port 40812 ssh2
Oct 31 22:42:48 sshd[10084]: Failed password for root from 121.18.238.109 port 40812 ssh2
Oct 31 22:42:50 sshd[10084]: Failed password for root from 121.18.238.109 port 40812 ssh2
Oct 31 22:42:50 sshd[10084]: Received disconnect from 121.18.238.109 port 40812:11:  [preauth]
Oct 31 22:42:50 sshd[10084]: Disconnected from 121.18.238.109 port 40812 [preauth]
Oct 31 22:42:50 sshd[10084]: PAM 2 more authentication failures; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.18.238.109  user=root
Oct 31 22:42:56 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.
Oct 31 22:42:56 systemd[1]: mysql.service: Unit entered failed state.
Oct 31 22:42:56 systemd[1]: mysql.service: Failed with result 'exit-code'.
Oct 31 22:42:56 systemd[1]: mysql.service: Service hold-off time over, scheduling restart.
Oct 31 22:42:56 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.
Oct 31 22:42:56 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.
Oct 31 22:42:56 systemd[1]: mysql.service: Main process exited, code=exited, status=1/FAILURE
Oct 31 22:43:04 sshd[10141]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.18.238.109  user=root
Oct 31 22:43:06 sshd[10141]: Failed password for root from 121.18.238.109 port 56169 ssh2
Oct 31 22:43:11 sshd[10141]: Failed password for root from 121.18.238.109 port 56169 ssh2
Oct 31 22:43:13 sshd[10141]: Failed password for root from 121.18.238.109 port 56169 ssh2
Oct 31 22:43:14 sshd[10178]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=116.31.116.23  user=root
Oct 31 22:43:17 sshd[10178]: Failed password for root from 116.31.116.23 port 60094 ssh2
Oct 31 22:43:18 sshd[10178]: Failed password for root from 116.31.116.23 port 60094 ssh2
Oct 31 22:43:20 sshd[10178]: Failed password for root from 116.31.116.23 port 60094 ssh2
Oct 31 22:43:20 sshd[10178]: Received disconnect from 116.31.116.23 port 60094:11:  [preauth]
Oct 31 22:43:20 sshd[10178]: Disconnected from 116.31.116.23 port 60094 [preauth]
Oct 31 22:43:20 sshd[10178]: PAM 2 more authentication failures; logname= uid=0 euid=0 tty=ssh ruser= rhost=116.31.116.23  user=root
Oct 31 22:43:21 sshd[10141]: Received disconnect from 121.18.238.109 port 56169:11:  [preauth]
Oct 31 22:43:21 sshd[10141]: Disconnected from 121.18.238.109 port 56169 [preauth]
Oct 31 22:43:21 sshd[10141]: PAM 2 more authentication failures; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.18.238.109  user=root

More info that could help. I tired mysql but received ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)

Also, here is the Error log

    2016-10-31T19:06:58.590888Z 0 [Note] Giving 0 client threads a chance to die gracefully
2016-10-31T19:06:58.591364Z 0 [Note] Shutting down slave threads
2016-10-31T19:06:58.592730Z 0 [Note] Forcefully disconnecting 0 remaining clients
2016-10-31T19:06:58.592792Z 0 [Note] Event Scheduler: Purging the queue. 0 events
2016-10-31T19:06:58.598944Z 0 [Note] Binlog end
2016-10-31T19:06:58.701931Z 0 [Note] Shutting down plugin 'validate_password'
2016-10-31T19:06:58.705709Z 0 [Note] Shutting down plugin 'ngram'
2016-10-31T19:06:58.705751Z 0 [Note] Shutting down plugin 'ARCHIVE'
2016-10-31T19:06:58.705790Z 0 [Note] Shutting down plugin 'partition'
2016-10-31T19:06:58.705812Z 0 [Note] Shutting down plugin 'BLACKHOLE'
2016-10-31T19:06:58.705844Z 0 [Note] Shutting down plugin 'INNODB_SYS_VIRTUAL'
2016-10-31T19:06:58.706964Z 0 [Note] Shutting down plugin 'INNODB_SYS_DATAFILES'
2016-10-31T19:06:58.707001Z 0 [Note] Shutting down plugin 'INNODB_SYS_TABLESPACES'
2016-10-31T19:06:58.707020Z 0 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN_COLS'
2016-10-31T19:06:58.707037Z 0 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN'
2016-10-31T19:06:58.707054Z 0 [Note] Shutting down plugin 'INNODB_SYS_FIELDS'
2016-10-31T19:06:58.707208Z 0 [Note] Shutting down plugin 'INNODB_SYS_COLUMNS'
2016-10-31T19:06:58.707235Z 0 [Note] Shutting down plugin 'INNODB_SYS_INDEXES'
2016-10-31T19:06:58.707255Z 0 [Note] Shutting down plugin 'INNODB_SYS_TABLESTATS'
2016-10-31T19:06:58.707271Z 0 [Note] Shutting down plugin 'INNODB_SYS_TABLES'
2016-10-31T19:06:58.707286Z 0 [Note] Shutting down plugin 'INNODB_FT_INDEX_TABLE'
2016-10-31T19:06:58.707306Z 0 [Note] Shutting down plugin 'INNODB_FT_INDEX_CACHE'
2016-10-31T19:06:58.707322Z 0 [Note] Shutting down plugin 'INNODB_FT_CONFIG'
2016-10-31T19:06:58.707340Z 0 [Note] Shutting down plugin 'INNODB_FT_BEING_DELETED'
2016-10-31T19:06:58.707358Z 0 [Note] Shutting down plugin 'INNODB_FT_DELETED'
2016-10-31T19:06:58.707411Z 0 [Note] Shutting down plugin 'INNODB_FT_DEFAULT_STOPWORD'
2016-10-31T19:06:58.707432Z 0 [Note] Shutting down plugin 'INNODB_METRICS'
2016-10-31T19:06:58.707449Z 0 [Note] Shutting down plugin 'INNODB_TEMP_TABLE_INFO'
2016-10-31T19:06:58.707467Z 0 [Note] Shutting down plugin 'INNODB_BUFFER_POOL_STATS'
2016-10-31T19:06:58.707484Z 0 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE_LRU'
2016-10-31T19:06:58.707499Z 0 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE'
2016-10-31T19:06:58.707516Z 0 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX_RESET'
2016-10-31T19:06:58.707534Z 0 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX'
2016-10-31T19:06:58.707566Z 0 [Note] Shutting down plugin 'INNODB_CMPMEM_RESET'
2016-10-31T19:06:58.707587Z 0 [Note] Shutting down plugin 'INNODB_CMPMEM'
2016-10-31T19:06:58.707603Z 0 [Note] Shutting down plugin 'INNODB_CMP_RESET'
2016-10-31T19:06:58.707619Z 0 [Note] Shutting down plugin 'INNODB_CMP'
2016-10-31T19:06:58.707636Z 0 [Note] Shutting down plugin 'INNODB_LOCK_WAITS'
2016-10-31T19:06:58.707654Z 0 [Note] Shutting down plugin 'INNODB_LOCKS'
2016-10-31T19:06:58.707672Z 0 [Note] Shutting down plugin 'INNODB_TRX'
2016-10-31T19:06:58.707698Z 0 [Note] Shutting down plugin 'InnoDB'
2016-10-31T19:06:58.711649Z 0 [Note] InnoDB: FTS optimize thread exiting.
2016-10-31T19:06:58.714623Z 0 [Note] InnoDB: Starting shutdown...
2016-10-31T19:06:58.819989Z 0 [ERROR] InnoDB: Operating system error number 13 in a file operation.
2016-10-31T19:06:58.820088Z 0 [ERROR] InnoDB: The error means mysqld does not have the access rights to the directory.
2016-10-31T19:06:58.820228Z 0 [Note] InnoDB: Dumping buffer pool(s) to /var/lib/mysql/ib_buffer_pool
2016-10-31T19:06:58.820416Z 0 [ERROR] InnoDB: Cannot open '/var/lib/mysql/ib_buffer_pool.incomplete' for writing: Permission denied
2016-10-31T19:07:00.692529Z 0 [Note] InnoDB: Shutdown completed; log sequence number 1333673446
2016-10-31T19:07:00.693394Z 0 [ERROR] InnoDB: Operating system error number 13 in a file operation.
2016-10-31T19:07:00.693505Z 0 [ERROR] InnoDB: The error means mysqld does not have the access rights to the directory.
2016-10-31T19:07:00.693546Z 0 [Note] Shutting down plugin 'MEMORY'
2016-10-31T19:07:00.693586Z 0 [Note] Shutting down plugin 'PERFORMANCE_SCHEMA'
2016-10-31T19:07:00.693933Z 0 [Note] Shutting down plugin 'MRG_MYISAM'
2016-10-31T19:07:00.695547Z 0 [Note] Shutting down plugin 'MyISAM'
2016-10-31T19:07:00.696705Z 0 [Note] Shutting down plugin 'CSV'
2016-10-31T19:07:00.696747Z 0 [Note] Shutting down plugin 'sha256_password'
2016-10-31T19:07:00.696758Z 0 [Note] Shutting down plugin 'mysql_native_password'
2016-10-31T19:07:00.696766Z 0 [Note] Shutting down plugin 'keyring_file'
2016-10-31T19:07:00.728590Z 0 [Note] Shutting down plugin 'binlog'
2016-10-31T19:07:00.737815Z 0 [Note] /usr/sbin/mysqld: Shutdown complete

dont think so because i get ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) when trying mysql -u root -p — angdigi, Nov 01 '16 at 18:18
I'm flagging this as off-topic because it's not about programming; rather, it should have been posted on ServerFault or DBA. — underscore_d, Jul 12 '17 at 15:00

score 0 · Answer 1 · edited May 17 '23 at 02:12

0

try using sudo service mysql start

to start the mysqld service. the issue seems to be access rights - The error means mysqld does not have the access rights to the directory.

edited May 17 '23 at 02:12

Raptor

53,206
45
230
366

answered Nov 01 '16 at 18:20

Jay Lane

1,379
15
28

mm..I'm running the command as root user though. In any case, sudo wasn't installed, so I installed it and ran that command but received same error Job for mysql.service failed because the control process exited with error code. See "systemctl status mysql.service" and "journalctl -xe" for details. – angdigi Nov 01 '16 at 20:17

score 0 · Answer 2 · answered Jul 12 '17 at 14:33

0

I had a problem with that, in my case the problem was with log file, because this file was deleted. I solved it by recreating this file '/var/log/mysql/error.log', after that my server starting normaly.

answered Jul 12 '17 at 14:33

Gustavo S. Rodrigues

189
10

score 0 · Answer 3 · answered Jun 11 '18 at 07:32

Your data directory of mysql is gone for toss in where it holds all the DBs including mysql sys and authentication files.

You need to reinitialize mysql database by making fresh empty mysql base & data directory. You can follow steps from mysqld data directory initialization

You can use following mysqld to reset password easily

$ mysqld --initialize-insecure

to reset password from your Linux Variant root login. Else its little tougher to figure out generated password and that you need to have with init-file for settings I think. Because for me the process doesn't show up any random password.

Both the following option to be used I think. I cannot go over again. But you can try that it is generating and showing random password.

$ mysqld --initialize-insecure --initialize

Article says,

With --initialize-insecure, (either with or without --initialize because --initialize-insecure implies --initialize), the server does not generate a password or mark it expired, and writes a warning message

To reset password,

# mysql -u root --skip-password
....
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password';

MySql fails to start

3 Answers3