Nextcloud unaccessible with a HTTP 500 error

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Nextcloud version (eg, 12.0.2): 15.0.5.3
Operating system and version (eg, Ubuntu 17.04): Raspbian 9 (strech)
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.25
PHP version (eg, 7.1): PHP 7.2.22

The issue you are facing:
I am unable to start or update my Nextcloud instance (I use NextcloudPi). The Database Connection crashes with a “No such File or Directory” error and when starting mariadb/mysql manually, it crashes.
Moreover, when opening nextcloud using the Web Browser, it shows a blank page and DAVx⁾ returns a HTTP 500 Error.

Is this the first time you’ve seen this error? (Y/N): Yes

Steps to replicate it:
Unsure

The output of your Nextcloud log in Admin > Logging:
Since I am unable to access this, here is the output of nc-error.log:

[Tue Oct 01 14:27:04.397324 2019] [ssl:warn] [pid 499:tid 1995464944] AH01909: localhost:443:0 server certificate does NOT include an ID which matches the server name
[Tue Oct 01 14:27:04.409783 2019] [ssl:error] [pid 499:tid 1995464944] AH02217: ssl_stapling_init_cert: can't retrieve issuer certificate! [subject: CN=archlinux / issuer: CN=archlinux / serial: FBCE4F86FB5AAA58 / notbefore: Mar  9 16:17:33 2019 GMT / notafter: Mar  6 16:17:33 2029 GMT]
[Tue Oct 01 14:27:04.410004 2019] [ssl:error] [pid 499:tid 1995464944] AH02604: Unable to configure certificate localhost:443:0 for stapling
[Tue Oct 01 14:27:05.133713 2019] [ssl:warn] [pid 707:tid 1995464944] AH01909: localhost:443:0 server certificate does NOT include an ID which matches the server name
[Tue Oct 01 14:27:05.134994 2019] [ssl:error] [pid 707:tid 1995464944] AH02217: ssl_stapling_init_cert: can't retrieve issuer certificate! [subject: CN=archlinux / issuer: CN=archlinux / serial: FBCE4F86FB5AAA58 / notbefore: Mar  9 16:17:33 2019 GMT / notafter: Mar  6 16:17:33 2029 GMT]
[Tue Oct 01 14:27:05.135311 2019] [ssl:error] [pid 707:tid 1995464944] AH02604: Unable to configure certificate localhost:443:0 for stapling
[Tue Oct 01 14:27:06.146723 2019] [proxy:error] [pid 741:tid 1690543152] (2)No such file or directory: AH02454: FCGI: attempt to connect to Unix domain socket /run/php/php7.2-fpm.sock (*) failed
[Tue Oct 01 14:27:06.146968 2019] [proxy_fcgi:error] [pid 741:tid 1690543152] [client 192.168.3.100:49254] AH01079: failed to make connection to backend: httpd-UDS
[Tue Oct 01 14:33:41.710777 2019] [proxy_fcgi:error] [pid 741:tid 1690543152] [client 192.168.3.100:49270] AH01071: Got error 'PHP message: PHP Fatal error:  Uncaught Doctrine\\DBAL\\DBALException: Failed to connect to the database: An exception occured in driver: SQLSTATE[HY000] [2002] No such file or directory in /var/www/nextcloud/lib/private/DB/Connection.php:64\nStack trace:\n#0 /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(429): OC\\DB\\Connection->connect()\n#1 /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(389): Doctrine\\DBAL\\Connection->getDatabasePlatformVersion()\n#2 /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(328): Doctrine\\DBAL\\Connection->detectDatabasePlatform()\n#3 /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(623): Doctrine\\DBAL\\Connection->getDatabasePlatform()\n#4 /var/www/nextcloud/lib/private/DB/Connection.php(151): Doctrine\\DBAL\\Connection->setTransactionIsolation(2)\n#5 /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/DriverManager.php(172): OC\\DB\\Connection->__construct(Array, Object(Doctrin...\nPHP message: PHP Fatal error:  Uncaught Doctrine\\DBAL\\DBALException: Failed to connect to the database: An exception occured in driver: SQLSTATE[HY000] [2002] No such file or directory in /var/www/nextcloud/lib/private/DB/Connection.php:64\nStack trace:\n#0 /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(429): OC\\DB\\Connection->connect()\n#1 /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(389): Doctrine\\DBAL\\Connection->getDatabasePlatformVersion()\n#2 /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(328): Doctrine\\DBAL\\Connection->detectDatabasePlatform()\n#3 /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(623): Doctrine\\DBAL\\Connection->getDatabasePlatform()\n#4 /var/www/nextcloud/lib/private/DB/Connection.php(151): Doctrine\\DBAL\\Connection->setTransactionIsolation(2)\n#5 /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/DriverManager.php(172): OC\\DB\\Connection->__construct(Array, Object(Doctrin...\n'

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'passwordsalt' => '*<removed>*',
  'secret' => '*<removed>*',
  'trusted_domains' => 
  array (
    0 => 'localhost',
    5 => 'nextcloudpi.local',
    7 => 'nextcloudpi',
    8 => 'nextcloudpi.lan',
    1 => '192.168.3.7',
    11 => '94.134.92.100',
  ),
  'datadirectory' => '/var/www/nextcloud/data',
  'dbtype' => 'mysql',
  'version' => '15.0.5.3',
  'overwrite.cli.url' => 'http://localhost',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'ncadmin',
  'dbpassword' => '*<removed>*',
  'installed' => true,
  'instanceid' => 'ocmkxn4qrngc',
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' => 
  array (
    'host' => '/var/run/redis/redis.sock',
    'port' => 0,
    'timeout' => 0.0,
    'password' => '*<removed>*',
  ),
  'tempdirectory' => '/var/www/nextcloud/data/tmp',
  'mail_smtpmode' => 'sendmail',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_from_address' => 'admin',
  'mail_domain' => 'ownyourbits.com',
  'overwriteprotocol' => 'https',
  'jpeg_quality' => '60',
  'preview_max_x' => '2048',
  'preview_max_y' => '2048',
);

The output of your Apache/nginx/system log in /var/log/____:

(/var/log/apache2/nc-access.log)

192.168.3.100 - - [01/Oct/2019:14:29:57 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:30:29 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:31:01 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:31:33 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:27:06 +0100] "GET /status.php HTTP/2.0" 503 299 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:33:41 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:34:13 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:34:39 +0100] "GET / HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Windows NT 10.0; rv:68.0) Gecko/20100101 Firefox/68.0"
192.168.3.100 - - [01/Oct/2019:14:34:45 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:35:17 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:35:49 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:36:21 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:36:53 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:37:25 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:37:57 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:38:29 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:39:01 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:39:33 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:40:05 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:40:37 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:41:09 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:41:41 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:42:13 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:42:45 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:43:17 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:43:49 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:44:21 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:44:53 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:45:25 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:45:57 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:46:29 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:47:01 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:47:33 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:48:05 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:48:37 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:49:09 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:49:41 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:50:13 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:50:45 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:51:17 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:51:49 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"
192.168.3.100 - - [01/Oct/2019:14:52:21 +0100] "GET /status.php HTTP/2.0" 500 0 "-" "Mozilla/5.0 (Linux) mirall/2.5.3git (Nextcloud)"


(/var/log/apache2/error.log)

[Tue Oct 01 06:25:02.964544 2019] [ssl:warn] [pid 669:tid 1996009712] AH01909: localhost:4443:0 server certificate does NOT include an ID which matches the server name
[Tue Oct 01 06:25:02.966203 2019] [ssl:error] [pid 669:tid 1996009712] AH02217: ssl_stapling_init_cert: can't retrieve issuer certificate! [subject: CN=archlinux / issuer: CN=archlinux / serial: FBCE4F86FB5AAA58 / notbefore: Mar  9 16:17:33 2019 GMT / notafter: Mar  6 16:17:33 2029 GMT]
[Tue Oct 01 06:25:02.966383 2019] [ssl:error] [pid 669:tid 1996009712] AH02604: Unable to configure certificate localhost:4443:0 for stapling
[Tue Oct 01 06:25:03.000546 2019] [mpm_event:notice] [pid 669:tid 1996009712] AH00489: Apache/2.4.25 (Raspbian) OpenSSL/1.0.2l configured -- resuming normal operations
[Tue Oct 01 06:25:03.002075 2019] [core:notice] [pid 669:tid 1996009712] AH00094: Command line: '/usr/sbin/apache2'
[Tue Oct 01 14:24:39.414281 2019] [log_config:warn] [pid 7673:tid 1571767344] (28)No space left on device: [client 192.168.3.100:39136] AH00646: Error writing to /var/log/apache2/other_vhosts_access.log
[Tue Oct 01 14:27:04.412619 2019] [ssl:warn] [pid 499:tid 1995464944] AH01909: localhost:4443:0 server certificate does NOT include an ID which matches the server name
[Tue Oct 01 14:27:04.422635 2019] [ssl:error] [pid 499:tid 1995464944] AH02217: ssl_stapling_init_cert: can't retrieve issuer certificate! [subject: CN=archlinux / issuer: CN=archlinux / serial: FBCE4F86FB5AAA58 / notbefore: Mar  9 16:17:33 2019 GMT / notafter: Mar  6 16:17:33 2029 GMT]
[Tue Oct 01 14:27:04.422791 2019] [ssl:error] [pid 499:tid 1995464944] AH02604: Unable to configure certificate localhost:4443:0 for stapling
[Tue Oct 01 14:27:05.137882 2019] [ssl:warn] [pid 707:tid 1995464944] AH01909: localhost:4443:0 server certificate does NOT include an ID which matches the server name
[Tue Oct 01 14:27:05.139404 2019] [ssl:error] [pid 707:tid 1995464944] AH02217: ssl_stapling_init_cert: can't retrieve issuer certificate! [subject: CN=archlinux / issuer: CN=archlinux / serial: FBCE4F86FB5AAA58 / notbefore: Mar  9 16:17:33 2019 GMT / notafter: Mar  6 16:17:33 2029 GMT]
[Tue Oct 01 14:27:05.139564 2019] [ssl:error] [pid 707:tid 1995464944] AH02604: Unable to configure certificate localhost:4443:0 for stapling
[Tue Oct 01 14:27:06.006645 2019] [mpm_event:notice] [pid 707:tid 1995464944] AH00489: Apache/2.4.25 (Raspbian) OpenSSL/1.0.2l configured -- resuming normal operations
[Tue Oct 01 14:27:06.007211 2019] [core:notice] [pid 707:tid 1995464944] AH00094: Command line: '/usr/sbin/apache2'

Furthermore, her are some command outputs:

systemctl start maradb

Warning: mariadb.service changed on disk. Run 'systemctl daemon-reload' to reload units.
Job for mariadb.service failed because the control process exited with error code.
See "systemctl status mariadb.service" and "journalctl -xe" for details.

systemctl status mariadb.service

 ● mariadb.service - MariaDB 10.1.37 database server
       Loaded: loaded (/lib/systemd/system/mariadb.service; enabled; vendor preset: enabled)
      Drop-In: /etc/systemd/system/mariadb.service.d
               └─ncp-delay-automount.conf
       Active: activating (start-pre) since Wed 2019-10-02 19:27:56 BST; 6s ago
         Docs: man:mysqld(8)
               https://mariadb.com/kb/en/library/systemd/
      Process: 27623 ExecStart=/usr/sbin/mysqld $MYSQLD_OPTS $_WSREP_NEW_CLUSTER $_WSREP_START_POSITION (code=exited, status=1/FAILURE)
      Process: 27692 ExecStartPre=/bin/sh -c [ ! -e /usr/bin/galera_recovery ] && VAR= ||   VAR=`/usr/bin/galera_recovery`; [ $? -eq 0 ]   && systemctl set-environment _WSREP_START_POSITION=$VAR || exit 1 (code=exited, status=0/SUCCESS)
      Process: 27688 ExecStartPre=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)
      Process: 27685 ExecStartPre=/usr/bin/install -m 755 -o mysql -g root -d /var/run/mysqld (code=exited, status=0/SUCCESS)
     Main PID: 27623 (code=exited, status=1/FAILURE); Control PID: 27817 (sleep)
        Tasks: 1 (limit: 4915)
       CGroup: /system.slice/mariadb.service
               └─control
                 └─27817 /bin/sleep 20

    Oct 02 19:27:56 nextcloudpi systemd[1]: Starting MariaDB 10.1.37 database server...

journalctl -xe

Oct 01 15:02:33 nextcloudpi bash[13332]: #25 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(98): OC\AppFramework\Utility\SimpleContainer->buildClass(Object(ReflectionClass))
Oct 01 15:02:33 nextcloudpi bash[13332]: #26 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(119): OC\AppFramework\Utility\SimpleContainer->resolve('OC\\Authenticati...')
Oct 01 15:02:34 nextcloudpi bash[13332]: #27 /var/www/nextcloud/lib/private/ServerContainer.php(132): OC\AppFramework\Utility\SimpleContainer->query('OC\\Authenticati...')
Oct 01 15:02:34 nextcloudpi bash[13332]: #28 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(165): OC\ServerContainer->query('OC\\Authenticati...')
Oct 01 15:02:34 nextcloudpi bash[13332]: #29 /var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(114): OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}(Object(OC\Server))
Oct 01 15:02:34 nextcloudpi bash[13332]: #30 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(117): Pimple\Container->offsetGet('OC\\Authenticati...')
Oct 01 15:02:34 nextcloudpi bash[13332]: #31 /var/www/nextcloud/lib/private/ServerContainer.php(132): OC\AppFramework\Utility\SimpleContainer->query('OC\\Authenticati...')
Oct 01 15:02:34 nextcloudpi bash[13332]: #32 /var/www/nextcloud/lib/private/Server.php(372): OC\ServerContainer->query('OC\\Authenticati...')
Oct 01 15:02:34 nextcloudpi bash[13332]: #33 /var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(118): OC\Server->OC\{closure}(Object(OC\Server))
Oct 01 15:02:34 nextcloudpi bash[13332]: #34 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(117): Pimple\Container->offsetGet('OC\\User\\Session')
Oct 01 15:02:34 nextcloudpi bash[13332]: #35 /var/www/nextcloud/lib/private/ServerContainer.php(132): OC\AppFramework\Utility\SimpleContainer->query('OC\\User\\Session')
Oct 01 15:02:34 nextcloudpi bash[13332]: #36 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(165): OC\ServerContainer->query('OC\\User\\Session')
Oct 01 15:02:34 nextcloudpi bash[13332]: #37 /var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(114): OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}(Object(OC\Server))
Oct 01 15:02:34 nextcloudpi bash[13332]: #38 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(117): Pimple\Container->offsetGet('UserSession')
Oct 01 15:02:34 nextcloudpi bash[13332]: #39 /var/www/nextcloud/lib/private/ServerContainer.php(132): OC\AppFramework\Utility\SimpleContainer->query('UserSession')
Oct 01 15:02:34 nextcloudpi bash[13332]: #40 /var/www/nextcloud/lib/private/Server.php(1428): OC\ServerContainer->query('UserSession')
Oct 01 15:02:34 nextcloudpi bash[13332]: #41 /var/www/nextcloud/lib/private/Server.php(694): OC\Server->getUserSession()
Oct 01 15:02:34 nextcloudpi bash[13332]: #42 /var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(118): OC\Server->OC\{closure}(Object(OC\Server))
Oct 01 15:02:34 nextcloudpi bash[13332]: #43 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(117): Pimple\Container->offsetGet('OC\\App\\AppManag...')
Oct 01 15:02:34 nextcloudpi bash[13332]: #44 /var/www/nextcloud/lib/private/ServerContainer.php(132): OC\AppFramework\Utility\SimpleContainer->query('OC\\App\\AppManag...')
Oct 01 15:02:34 nextcloudpi bash[13332]: #45 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(165): OC\ServerContainer->query('OC\\App\\AppManag...')
Oct 01 15:02:34 nextcloudpi bash[13332]: #46 /var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(114): OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}(Object(OC\Server))
Oct 01 15:02:34 nextcloudpi bash[13332]: #47 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(117): Pimple\Container->offsetGet('AppManager')
Oct 01 15:02:34 nextcloudpi bash[13332]: #48 /var/www/nextcloud/lib/private/ServerContainer.php(132): OC\AppFramework\Utility\SimpleContainer->query('AppManager')
Oct 01 15:02:34 nextcloudpi bash[13332]: #49 /var/www/nextcloud/lib/private/Server.php(1723): OC\ServerContainer->query('AppManager')
Oct 01 15:02:34 nextcloudpi bash[13332]: #50 /var/www/nextcloud/lib/private/legacy/app.php(342): OC\Server->getAppManager()
Oct 01 15:02:34 nextcloudpi bash[13332]: #51 /var/www/nextcloud/lib/private/legacy/app.php(113): OC_App::getEnabledApps()
Oct 01 15:02:34 nextcloudpi bash[13332]: #52 /var/www/nextcloud/lib/base.php(654): OC_App::loadApps(Array)
Oct 01 15:02:34 nextcloudpi bash[13332]: #53 /var/www/nextcloud/lib/base.php(1068): OC::init()
Oct 01 15:02:34 nextcloudpi bash[13332]: #54 /var/www/nextcloud/console.php(46): require_once('/var/www/nextcl...')
Oct 01 15:02:34 nextcloudpi bash[13332]: #55 /var/www/nextcloud/occ(11): require_once('/var/www/nextcl...')
Oct 01 15:02:34 nextcloudpi systemd[1]: nextcloud-domain.service: Main process exited, code=exited, status=1/FAILURE
Oct 01 15:02:34 nextcloudpi sudo[13356]: pam_unix(sudo:session): session closed for user www-data
Oct 01 15:02:34 nextcloudpi bash[13332]: #56 {main}
Oct 01 15:02:34 nextcloudpi systemd[1]: nextcloud-domain.service: Unit entered failed state.
Oct 01 15:02:34 nextcloudpi systemd[1]: nextcloud-domain.service: Failed with result 'exit-code'.
Oct 01 15:02:37 nextcloudpi systemd[1]: mariadb.service: Service hold-off time over, scheduling restart.
Oct 01 15:02:37 nextcloudpi systemd[1]: Stopped MariaDB 10.1.37 database server.
-- Subject: Unit mariadb.service has finished shutting down
-- Defined-By: systemd
-- Support: https://www.debian.org/support
-- 
-- Unit mariadb.service has finished shutting down.
Oct 01 15:02:37 nextcloudpi systemd[1]: Starting MariaDB 10.1.37 database server...
-- Subject: Unit mariadb.service has begun start-up
-- Defined-By: systemd
-- Support: https://www.debian.org/support
-- 
-- Unit mariadb.service has begun starting up.
Oct 01 15:02:39 nextcloudpi systemd[1]: nextcloud-domain.service: Service hold-off time over, scheduling restart.
Oct 01 15:02:39 nextcloudpi systemd[1]: Stopped Register Current IP as Nextcloud trusted domain.
-- Subject: Unit nextcloud-domain.service has finished shutting down
-- Defined-By: systemd
-- Support: https://www.debian.org/support
-- 
-- Unit nextcloud-domain.service has finished shutting down.

Thank you for help in advance!

2

Hi,

So you definitely have to fix the DB not starting up. That should be the root cause of all your issues.

Have you tried running that command mentioned here?
systemctl daemon-reload

If that doesn’t help, I’d run:
systemctl disable mariadb
systemctl enable mariadb

and afterwards try again:
systemctl start mariadb

3

Hi Schmu,
Thanks for the proposed solution. However, it still crashes, but hey, this time it seems to be a different error, which is at least something.

● mariadb.service - MariaDB 10.1.37 database server
   Loaded: loaded (/lib/systemd/system/mariadb.service; enabled; vendor preset: enabled)
  Drop-In: /etc/systemd/system/mariadb.service.d
           └─ncp-delay-automount.conf
   Active: activating (start-pre) since Wed 2019-10-02 19:27:56 BST; 6s ago
     Docs: man:mysqld(8)
           https://mariadb.com/kb/en/library/systemd/
  Process: 27623 ExecStart=/usr/sbin/mysqld $MYSQLD_OPTS $_WSREP_NEW_CLUSTER $_WSREP_START_POSITION (code=exited, status=1/FAILURE)
  Process: 27692 ExecStartPre=/bin/sh -c [ ! -e /usr/bin/galera_recovery ] && VAR= ||   VAR=`/usr/bin/galera_recovery`; [ $? -eq 0 ]   && systemctl set-environment _WSREP_START_POSITION=$VAR || exit 1 (code=exited, status=0/SUCCESS)
  Process: 27688 ExecStartPre=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)
  Process: 27685 ExecStartPre=/usr/bin/install -m 755 -o mysql -g root -d /var/run/mysqld (code=exited, status=0/SUCCESS)
 Main PID: 27623 (code=exited, status=1/FAILURE); Control PID: 27817 (sleep)
    Tasks: 1 (limit: 4915)
   CGroup: /system.slice/mariadb.service
           └─control
             └─27817 /bin/sleep 20

Oct 02 19:27:56 nextcloudpi systemd[1]: Starting MariaDB 10.1.37 database server...

Do you have any other ideas on how to fix this?
Do you need the output of other commands of logs?

4

looks like the output is cropped. Could you try to post the complete output of the start attempt?

Furthermore, please run the following command and provide the output:
journalctl -u mariadb -xe

You are using the Nextcloud-Pi image NCP?

5 
-- Subject: Unit mariadb.service has finished shutting down
-- Defined-By: systemd
-- Support: https://www.debian.org/support
-- 
-- Unit mariadb.service has finished shutting down.
Oct 02 19:25:52 nextcloudpi systemd[1]: Starting MariaDB 10.1.37 database server...
-- Subject: Unit mariadb.service has begun start-up
-- Defined-By: systemd
-- Support: https://www.debian.org/support
-- 
-- Unit mariadb.service has begun starting up.
Oct 02 19:26:14 nextcloudpi mysqld[27036]: 2019-10-02 19:26:14 1996300080 [Note] /usr/sbin/mysqld (mysqld 10.1.37-MariaDB-0+deb9u1) starting as process 27036 ...
Oct 02 19:26:18 nextcloudpi systemd[1]: mariadb.service: Main process exited, code=exited, status=1/FAILURE
Oct 02 19:26:18 nextcloudpi systemd[1]: Failed to start MariaDB 10.1.37 database server.
-- Subject: Unit mariadb.service has failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
-- 
-- Unit mariadb.service has failed.
-- 
-- The result is failed.
Oct 02 19:26:18 nextcloudpi systemd[1]: mariadb.service: Unit entered failed state.
Oct 02 19:26:18 nextcloudpi systemd[1]: mariadb.service: Failed with result 'exit-code'.

I’ve updated my response above, sorry for that.

I use NextcloudPi on my Raspberry Pi to run Nextcloud and flashed the image onto a MicroUSB. It worked like a charm for about half a year and sometimes gave me a 500 error, but restarting my Pi solved it. However, now the error is not “removable” so to speak. I hope I didn’t understand your question wrong :sweat_smile:

6

I was actually hoping to see more details about the issue, but there is nothing at all :frowning:

Can you please:

  • check that there is enough storage space for the database
  • increase the log level for mariaDB if there is enough space left
  • start mariaDB again (after log level increased)
  • send the logs
7

Hi Schmu,
long story short: the issue is fixed :heart_eyes:
The detailed version: (in case someone else has this issue)

  • In the MariaDB config file, I added the option
    log_error=/var/log/mysql/mariadb.err

  • When starting mariaDB again and examining this file, I noticed the following error:

    2019-10-03 10:16:00 1996099376 [Note] Recovering after a crash using tc.log
    2019-10-03 10:16:00 1996099376 [ERROR] Can’t init tc log
    2019-10-03 10:16:00 1996099376 [ERROR] Aborting

  • When I tried to open the file located in /var/lib/mysql/tc.log, I wasn’t able to do so, it seemed like the file was corrupt, so I went ahead and deleted it

  • And voilĂ  - it’s now starting perfectly fine!

Thank you very much for your help, you saved my day!

1 Like
8

Great news! I’m glad you were able to solve this issue! :slight_smile: