In Production System throwing "Your data directory is not writable"

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1

System Info

Ubuntu 20.04.4 always updated
Apache current Ubuntu Version
MySQL 8.0.29
PHP 7.4.3 with opcache

Nextcloud 22.2.8
Traditional install, not a Snap or container install.
Lives on Digital Ocean.
Web app on droplet. 16 GB Memory / 8 AMD vCPUs / 160 GB Disk Almost never reach 100% of anything.
Data folder on mounted drive. 500 GB 1/2 full
In production, 6+ months.

Substituted subdomain and domain for actual.

Problem:
Everything works as it should except for this error generating an email every 5 minutes.
Email content below.
I can’t add more details, it just started happening.
I was in the middle of moving other unrelated servers and had to put it on ignore.
I read everything I could find, and I figure it is something simple I am not seeing.
I could go in and wack the code, but that is not usually my style.

Any help would be greatly appreciated.

92661970{“reqId”:“7GhG6xCinIlKIiUcoiCE”,“level”:3,“time”:“2022-07-08T11:50:02+00:00”,“remoteAddr”:"",“user”:"–",“app”:“PHP”,“method”:"",“url”:"–",“message”:“fopen(/mnt/wavecloud_data/data/data_dir_writability_test_62c819ea3126c.tmp): failed to open stream: Permission denied at /var/www/subdomain.domain.net/public_html/lib/private/legacy/OC_Util.php#791”,“userAgent”:"–",“version”:“22.2.3.0”,“exception”:{“Exception”:“Error”,“Message”:“fopen(/mnt/wavecloud_data/data/data_dir_writability_test_62c819ea3126c.tmp): failed to open stream: Permission denied at /var/www/subdomain.domainco.net/public_html/lib/private/legacy/OC_Util.php#791”,“Code”:0,“Trace”:[{“function”:“onError”,“class”:“OC\Log\ErrorHandler”,“type”:"::"},{“file”:"/var/www/subdomain.domain.net/public_html/lib/private/legacy/OC_Util.php",“line”:791,“function”:“fopen”},{“file”:"/var/www/subdomain.domain.net/public_html/lib/base.php",“line”:656,“function”:“checkServer”,“class”:“OC_Util”,“type”:"::"},{“file”:"/var/www/subdomain.domain.net/public_html/lib/base.php",“line”:1089,“function”:“init”,“class”:“OC”,“type”:"::"},{“file”:"/var/www/subdomain.domain.net/public_html/cron.php",“line”:42,“args”:["/var/www/subdomain.domain.net/public_html/lib/base.php"],“function”:“require_once”}],“File”:"/var/www/subdomain.domainco.net/public_html/lib/private/Log/ErrorHandler.php",“Line”:92,“CustomMessage”:"–"}}
Your data directory is not writable
Permissions can usually be fixed by giving the webserver write access to the root directory. See Installation wizard — Nextcloud latest Administration Manual latest documentation.

{“reqId”:“7GhG6xCinIlKIiUcoiCE”,“level”:3,“time”:“2022-07-08T11:50:02+00:00”,“remoteAddr”:"",“user”:"–",“app”:“PHP”,“method”:"",“url”:"–",“message”:“fopen(/mnt/wavecloud_data/data/nextcloud.log): failed to open stream: Permission denied at /var/www/subdomain.domain.net/public_html/lib/private/Log/File.php#84”,“userAgent”:"–",“version”:“22.2.3.0”}

2

What are the permissions on the data dir? Are any sub folders or files not owned and writable by your www user?

3 
/mnt                 drwxr-xr-x   root:root
/mnt/wavecloud_data  drwxrwxr-x   root:www-data

was root:root, but I changed it to see if it might change the error.


/mnt/wavecloud_data/data/ drwxrwx---  www-data:www-data

All subfolder permissions are drwxr-xr-x www-data:www-data
All file permissions are -rw-r--r-- www-data:www-data
I can create new users in the data directory.

5

Truncated nextcloud.log. Really should put it in log rotate.
Updated to Nextcloud 22.2.9.
There is nothing in the nextcloud.log.
Ran this to double-check my statements above and found one folder but contents were correct.
find /mnt/wavecloud_data/data ( ! -user www-data -o ! -group www-data ) -print
/mnt/wavecloud_data/data/Arnold/files/Insurance/Generic Insurance Brochure/Generic Insurance Brochure to Homeowner
from … /public_html# sudo -u www-data php -r ‘fopen("/mnt/wavecloud_data/data/data_dir_writability_test_62cc1ffd533d4.tmp",“w”);’
works
Still no joy.