[NCP] NextCloud check and MariaDB check down

Over night my cloud stopped working somehow. Ending in error 500. Using service mysql restart in the container seems to work. After this MariaDB isn’t down anymore, but it does not change anything because the NextCloud check is still error.

<details>
<summary>NextCloudPi diagnostics</summary>

```

Cannot load Zend OPcache - it was already loaded
NextCloudPi version  v1.18.0
NextCloudPi image    NextCloudPi_docker_07-20-19
distribution         Debian GNU/Linux 10 \n \l
automount            no
USB devices          sda
datadir              /data/nextcloud/data
data in SD           no
data filesystem      ext2/ext3
data disk usage      1.6T/3.6T
rootfs usage         14G/15G
swapfile             none
dbdir                /data/database
Nextcloud check      error
HTTPD service        up
PHP service          up
MariaDB service      down
Redis service        up
Postfix service      up
internet check       ok
port check 80        open
port check 443       open
IP                   ***REMOVED SENSITIVE VALUE***
gateway              ***REMOVED SENSITIVE VALUE***
interface            eth0
certificates         ***REMOVED SENSITIVE VALUE***
NAT loopback         no
uptime               0min

```
</details>


<details>
<summary>Nextcloud configuration</summary>

```

Cannot load Zend OPcache - it was already loaded
An unhandled exception has been thrown:
Doctrine\DBAL\DBALException: Failed to connect to the database: An exception occurred in driver: SQLSTATE[HY000] [2002] Connection refused in /data/nextcloud/lib/private/DB/Connection.php:64
Stack trace:
#0 /data/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(448): OC\DB\Connection->connect()
#1 /data/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(410): Doctrine\DBAL\Connection->getDatabasePlatformVersion()
#2 /data/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(354): Doctrine\DBAL\Connection->detectDatabasePlatform()
#3 /data/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(710): Doctrine\DBAL\Connection->getDatabasePlatform()
#4 /data/nextcloud/lib/private/DB/Connection.php(151): Doctrine\DBAL\Connection->setTransactionIsolation(2)
#5 /data/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/DriverManager.php(181): OC\DB\Connection->__construct(Array, Object(Doctrine\DBAL\Driver\PDOMySql\Driver), Object(Doctrine\DBAL\Configuration), Object(Doctrine\Common\EventManager))
#6 /data/nextcloud/lib/private/DB/ConnectionFactory.php(156): Doctrine\DBAL\DriverManager::getConnection(Array, Object(Doctrine\DBAL\Configuration), Object(Doctrine\Common\EventManager))
#7 /data/nextcloud/lib/private/Server.php(641): OC\DB\ConnectionFactory->getConnection('mysql', Array)
#8 /data/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(118): OC\Server->OC\{closure}(Object(OC\Server))
#9 /data/nextcloud/lib/private/ServerContainer.php(125): Pimple\Container->offsetGet('OCP\\IDBConnecti...')
#10 /data/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(165): OC\ServerContainer->query('OCP\\IDBConnecti...')
#11 /data/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(114): OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}(Object(OC\Server))
#12 /data/nextcloud/lib/private/ServerContainer.php(125): Pimple\Container->offsetGet('DatabaseConnect...')
#13 /data/nextcloud/lib/private/Server.php(1560): OC\ServerContainer->query('DatabaseConnect...')
#14 /data/nextcloud/lib/private/Server.php(362): OC\Server->getDatabaseConnection()
#15 /data/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(118): OC\Server->OC\{closure}(Object(OC\Server))
#16 /data/nextcloud/lib/private/ServerContainer.php(125): Pimple\Container->offsetGet('OC\\Authenticati...')
#17 /data/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(68): OC\ServerContainer->query('OC\\Authenticati...')
#18 /data/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(98): OC\AppFramework\Utility\SimpleContainer->buildClass(Object(ReflectionClass))
#19 /data/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(119): OC\AppFramework\Utility\SimpleContainer->resolve('OC\\Authenticati...')
#20 /data/nextcloud/lib/private/ServerContainer.php(150): OC\AppFramework\Utility\SimpleContainer->query('OC\\Authenticati...')
#21 /data/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(68): OC\ServerContainer->query('OC\\Authenticati...')
#22 /data/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(98): OC\AppFramework\Utility\SimpleContainer->buildClass(Object(ReflectionClass))
#23 /data/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(119): OC\AppFramework\Utility\SimpleContainer->resolve('OC\\Authenticati...')
#24 /data/nextcloud/lib/private/ServerContainer.php(150): OC\AppFramework\Utility\SimpleContainer->query('OC\\Authenticati...')
#25 /data/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(165): OC\ServerContainer->query('OC\\Authenticati...')
#26 /data/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(114): OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}(Object(OC\Server))
#27 /data/nextcloud/lib/private/ServerContainer.php(125): Pimple\Container->offsetGet('OC\\Authenticati...')
#28 /data/nextcloud/lib/private/Server.php(374): OC\ServerContainer->query('OC\\Authenticati...')
#29 /data/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(118): OC\Server->OC\{closure}(Object(OC\Server))
#30 /data/nextcloud/lib/private/ServerContainer.php(125): Pimple\Container->offsetGet('OC\\User\\Session')
#31 /data/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(165): OC\ServerContainer->query('OC\\User\\Session')
#32 /data/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(114): OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}(Object(OC\Server))
#33 /data/nextcloud/lib/private/ServerContainer.php(125): Pimple\Container->offsetGet('UserSession')
#34 /data/nextcloud/lib/private/Server.php(1436): OC\ServerContainer->query('UserSession')
#35 /data/nextcloud/lib/private/Server.php(694): OC\Server->getUserSession()
#36 /data/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(118): OC\Server->OC\{closure}(Object(OC\Server))
#37 /data/nextcloud/lib/private/ServerContainer.php(125): Pimple\Container->offsetGet('OC\\App\\AppManag...')
#38 /data/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(165): OC\ServerContainer->query('OC\\App\\AppManag...')
#39 /data/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(114): OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}(Object(OC\Server))
#40 /data/nextcloud/lib/private/ServerContainer.php(125): Pimple\Container->offsetGet('AppManager')
#41 /data/nextcloud/lib/private/Server.php(1731): OC\ServerContainer->query('AppManager')
#42 /data/nextcloud/lib/private/legacy/app.php(341): OC\Server->getAppManager()
#43 /data/nextcloud/lib/private/legacy/app.php(113): OC_App::getEnabledApps()
#44 /data/nextcloud/lib/base.php(640): OC_App::loadApps(Array)
#45 /data/nextcloud/lib/base.php(1056): OC::init()
#46 /data/nextcloud/console.php(46): require_once('/data/nextcloud...')
#47 /data/nextcloud/occ(11): require_once('/data/nextcloud...')
#48 {main}
```
</details>


<details>
<summary>HTTPd logs</summary>

```

[Wed Nov 13 11:36:44.617008 2019] [core:notice] [pid 96:tid 4145827200] AH00094: Command line: '/usr/sbin/apache2'
[Wed Nov 13 11:41:31.489159 2019] [proxy_fcgi:error] [pid 100:tid 4043056160] [client 192.168.178.21:57353] AH01071: Got error 'PHP message: PHP Notice:  Undefined index: app in /var/www/ncp-web/index.php on line 238PHP message: PHP Notice:  Undefined index: app in /var/www/ncp-web/index.php on line 244'
[Wed Nov 13 11:56:06.387536 2019] [mpm_event:notice] [pid 96:tid 4145827200] AH00492: caught SIGWINCH, shutting down gracefully
[Wed Nov 13 11:56:06.410578 2019] [proxy_fcgi:error] [pid 100:tid 4043056160] [client 192.168.178.21:57353] AH01067: Failed to read FastCGI header
[Wed Nov 13 11:56:06.410671 2019] [proxy_fcgi:error] [pid 100:tid 4043056160] (104)Connection reset by peer: [client 192.168.178.21:57353] AH01075: Error dispatching request to :4443:
[Wed Nov 13 11:56:25.833410 2019] [ssl:warn] [pid 94:tid 4150201728] AH01909: localhost:4443:0 server certificate does NOT include an ID which matches the server name
[Wed Nov 13 11:56:25.855453 2019] [ssl:warn] [pid 95:tid 4150201728] AH01909: localhost:4443:0 server certificate does NOT include an ID which matches the server name
[Wed Nov 13 11:56:25.857649 2019] [mpm_event:notice] [pid 95:tid 4150201728] AH00489: Apache/2.4.38 (Debian) OpenSSL/1.1.1d configured -- resuming normal operations
[Wed Nov 13 11:56:25.857703 2019] [core:notice] [pid 95:tid 4150201728] AH00094: Command line: '/usr/sbin/apache2'
[Wed Nov 13 12:05:32.414737 2019] [authnz_external:error] [pid 97:tid 3871183904] [client 192.168.178.21:57615] AuthExtern pwauth [/usr/sbin/pwauth]: Failed (1) for user ncp
[Wed Nov 13 12:05:32.414934 2019] [auth_basic:error] [pid 97:tid 3871183904] [client 192.168.178.21:57615] AH01617: user ncp: authentication failure for "/": Password Mismatch
[Wed Nov 13 12:05:41.321067 2019] [authnz_external:error] [pid 97:tid 3871183904] [client 192.168.178.21:57615] AuthExtern pwauth [/usr/sbin/pwauth]: Failed (1) for user ncp
[Wed Nov 13 12:05:41.321223 2019] [auth_basic:error] [pid 97:tid 3871183904] [client 192.168.178.21:57615] AH01617: user ncp: authentication failure for "/": Password Mismatch
[Wed Nov 13 12:05:51.473396 2019] [authnz_external:error] [pid 97:tid 3871183904] [client 192.168.178.21:57615] AuthExtern pwauth [/usr/sbin/pwauth]: Failed (1) for user ncp
[Wed Nov 13 12:05:51.473582 2019] [auth_basic:error] [pid 97:tid 3871183904] [client 192.168.178.21:57615] AH01617: user ncp: authentication failure for "/": Password Mismatch
[Wed Nov 13 12:06:16.606969 2019] [ssl:warn] [pid 93:tid 4148526464] AH01909: localhost:4443:0 server certificate does NOT include an ID which matches the server name
[Wed Nov 13 12:06:16.642497 2019] [ssl:warn] [pid 94:tid 4148526464] AH01909: localhost:4443:0 server certificate does NOT include an ID which matches the server name
[Wed Nov 13 12:06:16.644095 2019] [core:warn] [pid 94:tid 4148526464] AH00098: pid file /var/run/apache2/apache2.pid overwritten -- Unclean shutdown of previous Apache run?
[Wed Nov 13 12:06:16.646160 2019] [mpm_event:notice] [pid 94:tid 4148526464] AH00489: Apache/2.4.38 (Debian) OpenSSL/1.1.1d configured -- resuming normal operations
[Wed Nov 13 12:06:16.646230 2019] [core:notice] [pid 94:tid 4148526464] AH00094: Command line: '/usr/sbin/apache2'

```
</details>


<details>
<summary>Database logs</summary>

```

2019-11-13 11:56:26 0 [Warning] The parameter innodb_file_format is deprecated and has no effect. It may be removed in future releases. See https://mariadb.com/kb/en/library/xtradbinnodb-file-format/
2019-11-13 11:56:26 0 [Note] InnoDB: Using Linux native AIO
2019-11-13 11:56:26 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2019-11-13 11:56:26 0 [Note] InnoDB: Uses event mutexes
2019-11-13 11:56:26 0 [Note] InnoDB: Compressed tables use zlib 1.2.11
2019-11-13 11:56:26 0 [Note] InnoDB: Number of pools: 1
2019-11-13 11:56:26 0 [Note] InnoDB: Using generic crc32 instructions
2019-11-13 11:56:26 0 [Note] InnoDB: Initializing buffer pool, total size = 1.5G, instances = 1, chunk size = 128M
2019-11-13 11:56:26 0 [Note] InnoDB: Completed initialization of buffer pool
2019-11-13 11:56:26 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2019-11-13 11:56:26 0 [Note] InnoDB: 128 out of 128 rollback segments are active.
2019-11-13 11:56:26 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2019-11-13 11:56:26 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2019-11-13 11:56:26 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2019-11-13 11:56:26 0 [Note] InnoDB: Waiting for purge to start
2019-11-13 11:56:26 0 [Note] InnoDB: 10.3.17 started; log sequence number 2243468095; transaction id 10776936
2019-11-13 11:56:26 0 [Note] Plugin 'FEEDBACK' is disabled.
2019-11-13 11:56:26 0 [Note] InnoDB: Loading buffer pool(s) from /data/database/ib_buffer_pool
2019-11-13 11:56:26 0 [Note] Server socket created on IP: '127.0.0.1'.
2019-11-13 11:56:26 0 [ERROR] mysqld: Error writing file '/run/mysqld/mys
```
</details>


<details>
<summary>Nextcloud logs</summary>

```

{"reqId":"NWeUl96Moc3WNcmslEF4","level":3,"time":"2019-11-12T02:00:11+00:00","remoteAddr":"","user":"--","app":"PHP","method":"","url":"--","message":"Undefined index: dev at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#430","userAgent":"--","version":"16.0.5.1"}
{"reqId":"NWeUl96Moc3WNcmslEF4","level":3,"time":"2019-11-12T02:00:14+00:00","remoteAddr":"","user":"--","app":"PHP","method":"","url":"--","message":"stat(): stat failed for \/data\/nextcloud\/data\/appdata_ocpki9ramxdk\/preview\/168057\/366-256.png at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#143","userAgent":"--","version":"16.0.5.1"}
{"reqId":"Wc4OEJc7ZV8HcyEFPfNw","level":3,"time":"2019-11-12T02:00:14+00:00","remoteAddr":"","user":"--","app":"PHP","method":"","url":"--","message":"stat(): stat failed for \/data\/nextcloud\/data\/appdata_ocpki9ramxdk\/preview\/168057\/366-256.png at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#143","userAgent":"--","version":"16.0.5.1"}
{"reqId":"NWeUl96Moc3WNcmslEF4","level":3,"time":"2019-11-12T02:00:14+00:00","remoteAddr":"","user":"--","app":"PHP","method":"","url":"--","message":"filesize(): stat failed for \/data\/nextcloud\/data\/appdata_ocpki9ramxdk\/preview\/168057\/366-256.png at \/data\/nextcloud\/lib\/private\/LargeFileHelper.php#171","userAgent":"--","version":"16.0.5.1"}
{"reqId":"NWeUl96Moc3WNcmslEF4","level":3,"time":"2019-11-12T02:00:14+00:00","remoteAddr":"","user":"--","app":"PHP","method":"","url":"--","message":"Undefined index: mtime at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#428","userAgent":"--","version":"16.0.5.1"}
{"reqId":"NWeUl96Moc3WNcmslEF4","level":3,"time":"2019-11-12T02:00:14+00:00","remoteAddr":"","user":"--","app":"PHP","method":"","url":"--","message":"Undefined index: ino at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#429","userAgent":"--","version":"16.0.5.1"}
{"reqId":"NWeUl96Moc3WNcmslEF4","level":3,"time":"2019-11-12T02:00:14+00:00","remoteAddr":"","user":"--","app":"PHP","method":"","url":"--","message":"Undefined index: dev at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#430","userAgent":"--","version":"16.0.5.1"}
{"reqId":"Wc4OEJc7ZV8HcyEFPfNw","level":3,"time":"2019-11-12T02:00:14+00:00","remoteAddr":"","user":"--","app":"PHP","method":"","url":"--","message":"filesize(): stat failed for \/data\/nextcloud\/data\/appdata_ocpki9ramxdk\/preview\/168057\/366-256.png at \/data\/nextcloud\/lib\/private\/LargeFileHelper.php#171","userAgent":"--","version":"16.0.5.1"}
{"reqId":"Wc4OEJc7ZV8HcyEFPfNw","level":3,"time":"2019-11-12T02:00:14+00:00","remoteAddr":"","user":"--","app":"PHP","method":"","url":"--","message":"Undefined index: mtime at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#428","userAgent":"--","version":"16.0.5.1"}
{"reqId":"Wc4OEJc7ZV8HcyEFPfNw","level":3,"time":"2019-11-12T02:00:14+00:00","remoteAddr":"","user":"--","app":"PHP","method":"","url":"--","message":"Undefined index: ino at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#429","userAgent":"--","version":"16.0.5.1"}
{"reqId":"Wc4OEJc7ZV8HcyEFPfNw","level":3,"time":"2019-11-12T02:00:14+00:00","remoteAddr":"","user":"--","app":"PHP","method":"","url":"--","message":"Undefined index: dev at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#430","userAgent":"--","version":"16.0.5.1"}
{"reqId":"Xcqb6yigEeXccZKHxlJQ6wAAAE0","level":3,"time":"2019-11-12T11:47:55+00:00","remoteAddr":"5.189.170.219","user":"--","app":"PHP","method":"GET","url":"\/p\/000000000000.cfg","message":"unlink(\/data\/nextcloud\/data\/appdata_ocpki9ramxdk\/css\/activity\/062a-9db8-style.css): No such file or directory at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#228","userAgent":"libwww-perl\/5.833","version":"16.0.5.1"}
{"reqId":"Xcqb6yigEeXccZKHxlJQ6gAAAFA","level":3,"time":"2019-11-12T11:47:55+00:00","remoteAddr":"5.189.170.219","user":"--","app":"PHP","method":"GET","url":"\/provisioning\/000000000000.cfg","message":"unlink(\/data\/nextcloud\/data\/appdata_ocpki9ramxdk\/css\/core\/e211-9db8-css-variables.css.gzip): No such file or directory at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#228","userAgent":"libwww-perl\/5.833","version":"16.0.5.1"}
{"reqId":"Xcqb6yigEeXccZKHxlJQ7AAAAEw","level":3,"time":"2019-11-12T11:47:55+00:00","remoteAddr":"5.189.170.219","user":"--","app":"PHP","method":"GET","url":"\/Polycom\/000000000000.cfg","message":"unlink(\/data\/nextcloud\/data\/appdata_ocpki9ramxdk\/css\/files\/39b9-9db8-merged.css.gzip): No such file or directory at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#228","userAgent":"libwww-perl\/5.833","version":"16.0.5.1"}
{"reqId":"Xcqb6yigEeXccZKHxlJQ7AAAAEw","level":3,"time":"2019-11-12T11:47:55+00:00","remoteAddr":"5.189.170.219","user":"--","app":"PHP","method":"GET","url":"\/Polycom\/000000000000.cfg","message":"unlink(\/data\/nextcloud\/data\/appdata_ocpki9ramxdk\/css\/files_linkeditor\/42f3-9db8-merged.css.deps): No such file or directory at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#228","userAgent":"libwww-perl\/5.833","version":"16.0.5.1"}
{"reqId":"Xcqb6yigEeXccZKHxlJQ6gAAAFA","level":3,"time":"2019-11-12T11:47:56+00:00","remoteAddr":"5.189.170.219","user":"--","app":"PHP","method":"GET","url":"\/provisioning\/000000000000.cfg","message":"unlink(\/data\/nextcloud\/data\/appdata_ocpki9ramxdk\/css\/icons\/icons-vars.css): No such file or directory at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#228","userAgent":"libwww-perl\/5.833","version":"16.0.5.1"}
{"reqId":"Xcqb6yigEeXccZKHxlJQ6gAAAFA","level":3,"time":"2019-11-12T11:47:56+00:00","remoteAddr":"5.189.170.219","user":"--","app":"PHP","method":"GET","url":"\/provisioning\/000000000000.cfg","message":"unlink(\/data\/nextcloud\/data\/appdata_ocpki9ramxdk\/css\/notifications\/12a4-9db8-styles.css.deps): No such file or directory at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#228","userAgent":"libwww-perl\/5.833","version":"16.0.5.1"}
{"reqId":"Xcqb6yigEeXccZKHxlJQ6wAAAE0","level":3,"time":"2019-11-12T11:47:56+00:00","remoteAddr":"5.189.170.219","user":"--","app":"PHP","method":"GET","url":"\/p\/000000000000.cfg","message":"unlink(\/data\/nextcloud\/data\/appdata_ocpki9ramxdk\/css\/spreed\/41bb-9db8-merged-files.css.gzip): No such file or directory at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#228","userAgent":"libwww-perl\/5.833","version":"16.0.5.1"}
{"reqId":"Xcqb6yigEeXccZKHxlJQ7AAAAEw","level":3,"time":"2019-11-12T11:47:56+00:00","remoteAddr":"5.189.170.219","user":"--","app":"PHP","method":"GET","url":"\/Polycom\/000000000000.cfg","message":"unlink(\/data\/nextcloud\/data\/appdata_ocpki9ramxdk\/css\/text\/b24d-9db8-icons.css.deps): No such file or directory at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#228","userAgent":"libwww-perl\/5.833","version":"16.0.5.1"}
{"reqId":"Xcqb6yigEeXccZKHxlJQ6wAAAE0","level":3,"time":"2019-11-12T11:47:56+00:00","remoteAddr":"5.189.170.219","user":"--","app":"PHP","method":"GET","url":"\/p\/000000000000.cfg","message":"unlink(\/data\/nextcloud\/data\/appdata_ocpki9ramxdk\/css\/text\/b24d-9db8-icons.css.deps): No such file or directory at \/data\/nextcloud\/lib\/private\/Files\/Storage\/Local.php#228","userAgent":"libwww-perl\/5.833","version":"16.0.5.1"}

```
</details>

I solved it. As you can see in the log my rootfs usage 14G/15G and that means there is not even enough space to run everything.
Using the command du -sh **foldername** I could found out where a big memory usage is and going a step deeper and deeper landing in: /var/lib/docker/overlay2/c2a03cb558e35b996b1b0a70b5aaa485b38ad4f48539c175bbeaebaa3c8f3266/diff/var/log where I found the file ncp.log with 5.9 GB which was causing the problem. After deleting it and restarting everything it works like it should.