Invalid data directory after power cycle on proxmox turnkey install with NFS data directory

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1
Support intro

Nextcloud version (eg, 20.0.5): 19.0.6.2
Operating system and version (eg, Ubuntu 20.04): TurnKey GNU/Linux 16.0 (Debian 10/Buster)
Apache or nginx version (eg, Apache 2.4.cd25): replace me
PHP version (eg, 7.4): replace me

The issue you are facing:
i cannot access my files through web page or any ios app.
I was using a turnkey linux install on proxmox container. i had sucessfully moved my data directory an NFS drive and it was working fine for at least 4 months until (i think) a power cycle on proxmox and container caused some isse and now from web page i get invalid data directory and the suggestion that .ocdata is missing (it isn’t).

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

Steps to replicate it:

  1. By changing the data directory back to the original (var/www/nextcloud/data) i can get access to the web page but none of my files are there, the folders are.
    2, i have chaged the owner of the files in data directory to www-data.
total 76
drwxr-x---  8 www-data www-data  4096 Mar 26 11:21 .
drwxrwx---  8 www-data www-data  4096 Jan 12 22:28 ..
-rw-r--r--  1 www-data www-data   542 Jan 12 22:57 .htaccess
-rw-r--r--  1 www-data www-data     0 Mar 24 22:23 .ocdata
drwxr-xr-x  4 www-data www-data  4096 Jan 12 22:28 admin
drwxr-xr-x 12 www-data www-data  4096 Jan 27 18:54 appdata_oc10el8hld3f
drwxr-xr-x  3 www-data www-data  4096 Mar 26 09:03 user2
drwxr-xr-x  2 www-data www-data  4096 Jan 12 22:57 files_external
-rw-r--r--  1 www-data www-data     0 Jan 12 22:57 index.html
-rw-r--r--  1 www-data www-data     0 Mar 26 08:44 nextcloud.log
drwxr-xr-x  7 www-data www-data  4096 Jan 13 00:10 user1
drwxr-xr-x  4 www-data www-data  4096 Jan 12 22:57 updater-oc10el8hld3f
-rw-r--r--  1 www-data www-data 32959 Jan 12 22:57 updater.log

The output of your Nextcloud log in Admin > Logging:

the nextcloud.log within the migrated data directory is empty.  which is strange...

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

<?php
$CONFIG = array (
  'passwordsalt' => 'b6edb6d1c**********************cc22d6580d',
  'secret' => 'ef98fd4e0a5985ace53ac********************************50b968c4da98ea8c3f1c42a8fd0b56b73fbbc0858642160e',
  'trusted_domains' => 
  array (
    0 => '192.168.1.64',
    1 => 'nextcloud-*****.ddns.net',
    2 => 'localhost',
  ),
  'datadirectory' => '/mnt/Nextcloud/data',
  'dbtype' => 'mysql',
  'version' => '19.0.6.2',
  'overwrite.cli.url' => 'https://nextcloud-*****.ddns.net',
  'overwritehost' => 'nextcloud-*****.ddns.net',
  'overwriteprotocol' => 'https',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'nextcloud',
  'dbpassword' => '70b350a9c6133c25d5e3a1dc002bf884',
  'installed' => true,
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'redis' => 
  array (
    'host' => '/var/run/redis/redis.sock',
    'port' => 0,
    'timeout' => 0.0,
  ),
  'filelocking.enabled' => true,
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'instanceid' => 'oc10el8hld3f',
  'maintenance' => false,
  'theme' => '',
  'loglevel' => 2,
);

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


[Fri Mar 26 00:00:28.928382 2021] [ssl:warn] [pid 412] AH01909: localhost:443:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 00:00:28.929338 2021] [ssl:warn] [pid 412] AH01909: localhost:12322:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 00:00:28.929456 2021] [mpm_prefork:notice] [pid 412] AH00163: Apache/2.4.38 (Debian) OpenSSL/1.1.1d configured -- resuming normal operations
[Fri Mar 26 00:00:28.929461 2021] [core:notice] [pid 412] AH00094: Command line: '/usr/sbin/apache2'
[Fri Mar 26 09:22:01.268770 2021] [mpm_prefork:notice] [pid 412] AH00169: caught SIGTERM, shutting down
[Fri Mar 26 09:22:10.868076 2021] [ssl:warn] [pid 289] AH01909: localhost:443:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 09:22:10.870660 2021] [ssl:warn] [pid 289] AH01909: localhost:12322:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 09:22:11.190604 2021] [ssl:warn] [pid 372] AH01909: localhost:443:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 09:22:11.190882 2021] [ssl:warn] [pid 372] AH01909: localhost:12322:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 09:22:11.193544 2021] [mpm_prefork:notice] [pid 372] AH00163: Apache/2.4.38 (Debian) OpenSSL/1.1.1d configured -- resuming normal operations
[Fri Mar 26 09:22:11.193569 2021] [core:notice] [pid 372] AH00094: Command line: '/usr/sbin/apache2'
[Fri Mar 26 10:23:34.204031 2021] [mpm_prefork:notice] [pid 372] AH00169: caught SIGTERM, shutting down
[Fri Mar 26 10:23:40.767710 2021] [ssl:warn] [pid 323] AH01909: localhost:443:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 10:23:40.768371 2021] [ssl:warn] [pid 323] AH01909: localhost:12322:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 10:23:41.020818 2021] [ssl:warn] [pid 387] AH01909: localhost:443:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 10:23:41.021095 2021] [ssl:warn] [pid 387] AH01909: localhost:12322:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 10:23:41.030749 2021] [mpm_prefork:notice] [pid 387] AH00163: Apache/2.4.38 (Debian) OpenSSL/1.1.1d configured -- resuming normal operations
[Fri Mar 26 10:23:41.030778 2021] [core:notice] [pid 387] AH00094: Command line: '/usr/sbin/apache2'
[Fri Mar 26 10:23:48.889511 2021] [access_compat:error] [pid 434] [client 192.168.1.205:52972] AH01797: client denied by server configuration: /var/www/nextcloud/config
[Fri Mar 26 10:43:12.000381 2021] [mpm_prefork:notice] [pid 387] AH00169: caught SIGTERM, shutting down
[Fri Mar 26 10:43:18.774320 2021] [ssl:warn] [pid 306] AH01909: localhost:443:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 10:43:18.775044 2021] [ssl:warn] [pid 306] AH01909: localhost:12322:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 10:43:19.026579 2021] [ssl:warn] [pid 374] AH01909: localhost:443:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 10:43:19.030177 2021] [ssl:warn] [pid 374] AH01909: localhost:12322:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 10:43:19.033208 2021] [mpm_prefork:notice] [pid 374] AH00163: Apache/2.4.38 (Debian) OpenSSL/1.1.1d configured -- resuming normal operations
[Fri Mar 26 10:43:19.033233 2021] [core:notice] [pid 374] AH00094: Command line: '/usr/sbin/apache2'
[Fri Mar 26 11:07:26.628184 2021] [mpm_prefork:notice] [pid 374] AH00169: caught SIGTERM, shutting down
[Fri Mar 26 11:07:33.455347 2021] [ssl:warn] [pid 305] AH01909: localhost:443:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 11:07:33.455839 2021] [ssl:warn] [pid 305] AH01909: localhost:12322:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 11:07:33.692046 2021] [ssl:warn] [pid 379] AH01909: localhost:443:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 11:07:33.692336 2021] [ssl:warn] [pid 379] AH01909: localhost:12322:0 server certificate does NOT include an ID which matches the server name
[Fri Mar 26 11:07:33.711047 2021] [mpm_prefork:notice] [pid 379] AH00163: Apache/2.4.38 (Debian) OpenSSL/1.1.1d configured -- resuming normal operations
[Fri Mar 26 11:07:33.711073 2021] [core:notice] [pid 379] AH00094: Command line: '/usr/sbin/apache2'
2

so replying to my own post to add some more evidence.
the steps i followed which previously worked
install trunkey linux nextcloud into proxmox container
set up data directory in container.
create mount for NFS drive
copy contents of data directory to the NFS mounted share
chown to www-data the new data directory
change data directory within config.php
this worked but after 3 months failed in the way of getting a web page front end with this message

Your data directory is invalid

Ensure there is a file called ".ocdata" in the root of the data directory.

Cannot create "data" directory

This can usually be fixed by giving the webserver write access to the root directory. See https://docs.nextcloud.com/server/20/go.php?to=admin-dir_permissions

i have tried chown and chmod 750 but nothing seems to work, if i change data directory back to original it works…