this post was submitted on 17 Aug 2023
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So, right now I'm trying the system crontab instead of my user crontab.
Just to reiterate from my post, however, I have tried the full path. I was giving example paths. I should have been more explicit that by just "using dot" I meant using relative and absolute paths.
All paths have been full paths from the get go, though I did try cd-ing into the folder and running it with a relative path. My hope at this point is that it's somehow a permissions issue as my storage setup is a bit odd with TrueNAS Scale running as a VM on ProxMox. Permissions with docker are usually hell, and I have to run literally everything that touches my NAS as root to get the permissions to play nicely, so it would make sense here that it's just the permissions being upset and preventing access to the files.
I set a backup to run on the hour, so I'll report back with whatever happens.
Yes, you should never use sudo inside a users crontab. If you want to run as root then use the system crontab.
I would also encourage looking at systemd timers. They are more verbose then crontab, but far easier to debug and see what is going on. They work off services so automatically log to journald like all other services and you can easily see when they last ran, if it was successful and when it will next run with
systemctl list-timers. All things you can do with cron, but requires a lot more setup yourself.I appreciate the advice! I had never really heard about the distinction between the system crontab and user crontabs. While it makes sense in retrospect, I am entirely self-taught about this stuff, and nowhere I had looked had ever mentioned that there were two separate crontabs.
Do you happen to know of a good resource to learn about those off the top of your head? I appreciate the suggestion!
The arch wiki is always a good place to look. There are a lot of introduction blog posts around that I have not read so cannot recommend - but plenty to look at if you need more information or a more beginner friendly guide than the arch wiki.
The freedesktop manuals are also worth a look at for more advanced stuff you can do with them - but are not really required for basic things. They just detail all the settings you have available and are much more of a reference than a guide.