XF\Db\Exception: MySQL statement prepare error [2006]: MySQL server has gone away

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canina

Active member
Clean server ubuntu 20.04.5 with lamp.
I am installing a xenforo forum and during the installation the following error occurs:

XF\Db\Exception: MySQL statement prepare error [2006]: MySQL server has gone away in src/XF/Db/AbstractStatement.php at line 230 XF\Db\AbstractStatement->getException() in src/XF/Db/Mysqli/Statement.php at line 198 XF\Db\Mysqli\Statement->getException() in src/XF/Db/Mysqli/Statement.php at line 41 XF\Db\Mysqli\Statement->prepare() in src/XF/Db/Mysqli/Statement.php at line 56 XF\Db\Mysqli\Statement->execute() in src/XF/Db/AbstractAdapter.php at line 96 XF\Db\AbstractAdapter->query() in src/XF/Db/AbstractAdapter.php at line 324 XF\Db\AbstractAdapter->update() in src/XF/Job/Manager.php at line 274 XF\Job\Manager->runJobInternal() in src/XF/Job/Manager.php at line 202 XF\Job\Manager->runJobEntry() in src/XF/Job/Manager.php at line 153 XF\Job\Manager->runUnique() in src/XF/Install/Controller/AbstractController.php at line 24 XF\Install\Controller\AbstractController->manualJobRunner() in src/XF/Install/Controller/Install.php at line 198 XF\Install\Controller\Install->actionRunJob() in src/XF/Mvc/Dispatcher.php at line 352 XF\Mvc\Dispatcher->dispatchClass() in src/XF/Mvc/Dispatcher.php at line 259 XF\Mvc\Dispatcher->dispatchFromMatch() in src/XF/Mvc/Dispatcher.php at line 115 XF\Mvc\Dispatcher->dispatchLoop() in src/XF/Mvc/Dispatcher.php at line 57 XF\Mvc\Dispatcher->run() in src/XF/App.php at line 2483 XF\App->run() in src/XF.php at line 524 XF::runApp() in install/index.php at line 14

The mysql log is:
'/var/run/mysqld/mysqld.sock' port: 3306 (Ubuntu). 2023-05-03T17:54:26.376869Z 0 [Warning] [MY-010139] [Server] Changed limits: max_open_files: 10000 (requested 105111) 2023-05-03T17:54:26.376874Z 0 [Warning] [MY-010142] [Server] Changed limits: table_open_cache: 4932 (requested 52488) 2023-05-03T17:54:26.910698Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.32-0ubuntu0.20.04.2) starting as process 93538 2023-05-03T17:54:26.964886Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started. 2023-05-03T17:54:28.134622Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended. 2023-05-03T17:54:29.140504Z 0 [System] [MY-010229] [Server] Starting XA crash recovery... 2023-05-03T17:54:29.178362Z 0 [System] [MY-010232] [Server] XA crash recovery finished. 2023-05-03T17:54:29.348026Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed. 2023-05-03T17:54:29.348573Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel. 2023-05-03T17:54:29.406019Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.32-0ubuntu0.20.04.2' socket: '/var/run/mysqld/mysqld.sock' port: 3306 (Ubuntu). 2023-05-03T17:54:29.406291Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '127.0.0.1' port: 33060, socket: /var/run/mysqld/mysqlx.sock 2023-05-03T18:03:49.760918Z 0 [Warning] [MY-010139] [Server] Changed limits: max_open_files: 10000 (requested 105111) 2023-05-03T18:03:49.760922Z 0 [Warning] [MY-010142] [Server] Changed limits: table_open_cache: 4932 (requested 52488) 2023-05-03T18:03:50.078617Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.32-0ubuntu0.20.04.2) starting as process 93779 2023-05-03T18:03:50.101949Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started. 2023-05-03T18:03:50.781883Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended. 2023-05-03T18:03:51.552947Z 0 [System] [MY-010229] [Server] Starting XA crash recovery... 2023-05-03T18:03:51.573385Z 0 [System] [MY-010232] [Server] XA crash recovery finished. 2023-05-03T18:03:51.867742Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed. 2023-05-03T18:03:51.868049Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel. 2023-05-03T18:03:51.916660Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '127.0.0.1' port: 33060, socket: /var/run/mysqld/mysqlx.sock 2023-05-03T18:03:51.917208Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.32-0ubuntu0.20.04.2' socket: '/var/run/mysqld/mysqld.sock' port: 3306 (Ubuntu). 2023-05-03T18:03:49.760922Z 0 [Warning] [MY-010142] [Server] Changed limits: table_open_cache: 4932 (requested 52488) 2023-05-03T18:03:50.078617Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.32-0ubuntu0.20.04.2) starting as process 93779 2023-05-03T18:03:50.101949Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started. 2023-05-03T18:03:50.781883Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended. 2023-05-03T18:03:51.552947Z 0 [System] [MY-010229] [Server] Starting XA crash recovery... 2023-05-03T18:03:51.573385Z 0 [System] [MY-010232] [Server] XA crash recovery finished. 2023-05-03T18:03:51.867742Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed. 2023-05-03T18:03:51.868049Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel. 2023-05-03T18:03:51.916660Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '127.0.0.1' port: 33060, socket: /var/run/mysqld/mysqlx.sock 2023-05-03T18:03:51.917208Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.32-0ubuntu0.20.04.2' socket: '/var/run/mysqld/mysqld.sock' port: 3306 (Ubuntu).


The my.cnf configuration is:

!includedir /etc/mysql/conf.d/ !includedir /etc/mysql/mysql.conf.d/ [mysqld] max_allowed_packet = 16M wait_timeout = 28800 thread_stack = 128K max_connections = 125 table_open_cache = 52488 key_buffer_size = 32M
what could be the problem?
Thanks.
 
Last edited:
Solution
JonathanW
Yeah that's probably not going to work very well unless you turn a whole bunch of things way down. You need to turn down a bunch of MySQL buffers and likely PHP-FPM (assuming it's what you're using) as well.

Basically, get more RAM.
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Looks like you are hitting some config limits.

Are you self managed, shared hosting?

I'll move the thread to server support as that is more appropriate - it's going to require some changes.
 
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Yeah that's probably not going to work very well unless you turn a whole bunch of things way down. You need to turn down a bunch of MySQL buffers and likely PHP-FPM (assuming it's what you're using) as well.

Basically, get more RAM.
 
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Solution
gone away errors are usually because of too low of a wait_timeout setting, but yours is already high at the default setting. i use 600.

i agree with the above comment, you need more power/ram. your phone has more ram than your web server. :X
 
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Thanks. I upgraded and it did go away.

I didn't think in this direction since I have previously installed xenforo countless times and it was always on no more than 1Gb ram
 
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