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Help!!! MySQL keeps crashing - Error establishing a database connection

Posted October 24, 2020 992 views
MySQLWordPress

I have a One-Click WordPress Droplet, 10$ monthly/ 2GB/1CPU and I have a problem with my MySQL server that keeps crashing every day.
I will list below the last 100 lines from the myqsl/error.log file.
I can’t figure out what the problem/error is in order to fix it.

2020-10-24T07:31:01.856129Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.21-0ubuntu0.20.04.4) starting as process 10073
2020-10-24T07:31:01.876064Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2020-10-24T07:31:02.620467Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2020-10-24T07:31:02.952053Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock
2020-10-24T07:31:02.982762Z 0 [System] [MY-010229] [Server] Starting XA crash recovery...
2020-10-24T07:31:02.996709Z 0 [System] [MY-010232] [Server] XA crash recovery finished.
2020-10-24T07:31:03.093543Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2020-10-24T07:31:03.093860Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
2020-10-24T07:31:03.132067Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.21-0ubuntu0.20.04.4'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  (Ubuntu).
2020-10-24T07:31:05.146700Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.21-0ubuntu0.20.04.4) starting as process 10148
2020-10-24T07:31:05.169210Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2020-10-24T07:31:06.103789Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2020-10-24T07:31:07.264196Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.21-0ubuntu0.20.04.4) starting as process 10180
2020-10-24T07:31:07.289518Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2020-10-24T07:31:08.277784Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2020-10-24T07:31:08.537337Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock
2020-10-24T07:31:08.607568Z 0 [System] [MY-010229] [Server] Starting XA crash recovery...
2020-10-24T07:31:08.629252Z 0 [System] [MY-010232] [Server] XA crash recovery finished.
2020-10-24T07:31:08.745647Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2020-10-24T07:31:08.746301Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
2020-10-24T07:31:08.905259Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.21-0ubuntu0.20.04.4'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  (Ubuntu).
2020-10-24T07:31:11.452640Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.21-0ubuntu0.20.04.4) starting as process 10248
2020-10-24T07:31:11.465881Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2020-10-24T07:31:11.973403Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2020-10-24T07:31:12.174284Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock
2020-10-24T07:31:12.203740Z 0 [System] [MY-010229] [Server] Starting XA crash recovery...
2020-10-24T07:31:12.232495Z 0 [System] [MY-010232] [Server] XA crash recovery finished.
2020-10-24T07:31:12.297819Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2020-10-24T07:31:12.298077Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
2020-10-24T07:31:12.334587Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.21-0ubuntu0.20.04.4'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  (Ubuntu).
2020-10-24T07:31:13.997940Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.21-0ubuntu0.20.04.4) starting as process 10316
2020-10-24T07:31:14.013881Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2020-10-24T07:31:14.552485Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2020-10-24T07:31:14.863655Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock
2020-10-24T07:31:14.889576Z 0 [System] [MY-010229] [Server] Starting XA crash recovery...
2020-10-24T07:31:14.903368Z 0 [System] [MY-010232] [Server] XA crash recovery finished.
2020-10-24T07:31:14.981442Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2020-10-24T07:31:14.981683Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
2020-10-24T07:31:15.018988Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.21-0ubuntu0.20.04.4'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  (Ubuntu).
2020-10-24T07:33:20.210922Z 0 [System] [MY-013172] [Server] Received SHUTDOWN from user <via user signal>. Shutting down mysqld (Version: 8.0.21-0ubuntu0.20.04.4).
2020-10-24T07:33:22.353969Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.21-0ubuntu0.20.04.4)  (Ubuntu).
2020-10-24T07:33:38.665366Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.21-0ubuntu0.20.04.4) starting as process 832
2020-10-24T07:33:38.746633Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2020-10-24T07:33:40.191389Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2020-10-24T07:33:40.885075Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock
2020-10-24T07:33:41.272997Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2020-10-24T07:33:41.273226Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
2020-10-24T07:33:41.424955Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.21-0ubuntu0.20.04.4'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  (Ubuntu).
2020-10-24T11:00:05.273777Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.21-0ubuntu0.20.04.4) starting as process 3172
2020-10-24T11:00:05.309118Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2020-10-24T11:00:06.116308Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2020-10-24T11:00:06.461215Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock
2020-10-24T11:00:06.500785Z 0 [System] [MY-010229] [Server] Starting XA crash recovery...
2020-10-24T11:00:06.540711Z 0 [System] [MY-010232] [Server] XA crash recovery finished.
2020-10-24T11:00:06.664386Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2020-10-24T11:00:06.667602Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
2020-10-24T11:00:06.768605Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.21-0ubuntu0.20.04.4'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  (Ubuntu).
2020-10-24T11:00:10.347972Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.21-0ubuntu0.20.04.4) starting as process 3248
2020-10-24T11:00:10.373218Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2020-10-24T11:00:15.998583Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.21-0ubuntu0.20.04.4) starting as process 3298
2020-10-24T11:00:16.072693Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2020-10-24T11:00:17.879610Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.21-0ubuntu0.20.04.4) starting as process 3320
2020-10-24T11:00:17.897421Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2020-10-24T11:00:18.500327Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2020-10-24T11:00:18.714748Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock
2020-10-24T11:00:18.739013Z 0 [System] [MY-010229] [Server] Starting XA crash recovery...
2020-10-24T11:00:18.766570Z 0 [System] [MY-010232] [Server] XA crash recovery finished.
2020-10-24T11:00:18.833908Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2020-10-24T11:00:18.834329Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
2020-10-24T11:00:18.876799Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.21-0ubuntu0.20.04.4'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  (Ubuntu).
2020-10-24T11:00:21.372868Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.21-0ubuntu0.20.04.4) starting as process 3392
2020-10-24T11:00:21.386615Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2020-10-24T11:00:21.967532Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2020-10-24T11:00:22.178607Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock
2020-10-24T11:00:22.215765Z 0 [System] [MY-010229] [Server] Starting XA crash recovery...
2020-10-24T11:00:22.235954Z 0 [System] [MY-010232] [Server] XA crash recovery finished.
2020-10-24T11:00:22.306862Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2020-10-24T11:00:22.307524Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
2020-10-24T11:00:22.361595Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.21-0ubuntu0.20.04.4'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  (Ubuntu).
2020-10-24T11:00:24.163291Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.21-0ubuntu0.20.04.4) starting as process 3467
2020-10-24T11:00:24.180379Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2020-10-24T11:00:24.739507Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2020-10-24T11:00:24.930210Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock
2020-10-24T11:00:24.956663Z 0 [System] [MY-010229] [Server] Starting XA crash recovery...
2020-10-24T11:00:24.971527Z 0 [System] [MY-010232] [Server] XA crash recovery finished.
2020-10-24T11:00:25.030456Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2020-10-24T11:00:25.030717Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
2020-10-24T11:00:25.068120Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.21-0ubuntu0.20.04.4'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  (Ubuntu).
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1 answer
bobbyiliev October 24, 2020

Hello, all

This crash is most likely due to your system running out of memory. I’d suggest that you add a swap file to give yourself a bit more of a buffer. Check out this tutorial:

How To Add Swap on Ubuntu 18.04

What you can also do is to use the MySQLTuner script.

The MySQLTuner is a script written in Perl and allows you to quickly test your MySQL configuration and it gives you suggestions for adjustments to increase performance and stability.

According to the official GitHub page, it supports 300 indicators for MySQL/MariaDB/Percona Server in this last version.

To run the script you could do the following:

  • SSH to your Droplet
  • Download the script:
wget http://mysqltuner.pl/ -O mysqltuner.pl
  • Then execute it:
perl mysqltuner.pl

The script would run multiple checks against your MySQL instance, all checks done by MySQLTuner are documented here.

Also as stated in the official documentation, it is still extremely important for you to fully understand each change you make to a MySQL database server. If you don’t understand portions of the script’s output, or if you don’t understand the recommendations, you should consult a knowledgeable DBA or system administrator that you trust.

As a good practice make sure to always test your changes on staging environments before implementing them on your production database.

On the same note, if you want to have worry-free MySQL hosting and focus on your application, I would recommend trying out the DigitalOcean Managed Databases:

https://www.digitalocean.com/products/managed-databases-mysql/

Source:
https://www.digitalocean.com/community/questions/how-to-tweak-mysql-mariadb-configuration-for-increased-performance-and-stability

Hope that this helps!
Regards,
Bobby

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