Workers: report real disk size (and CPU / RAM)

[benoit74]

Currently, disk size assigned to each workers is not much used AFAIK.

However, the disk size configured in zimfarm.config is displayed in the UI.

Would be great to at least check if the disk size available for docker containers is in accordance with what is configured in zimfarm.config, so that Zimfarm editors / devs are not mislead by a wrong configuration

By default, a df /var/lib/docker/overlay2 should do the trick, but this can be customized, don't know yet how to correctly check it)

Probably true for RAM / CPU as well, this would help diagnose problems as we have more and more workers which are not under our control.

[rgaudin]

I like that worker admins can set resources for zimfarm and don't have to entirely donate all host resources to the worker. Was done on purpose but can be reassessed indeed.

Probably true for RAM / CPU as well, this would help diagnose problems

I don't see how that would help TBH.

Also, we should keep in mind that there's a major difference between CPU/RAM which are enforced by docker and disk which is not at all.

[benoit74]

I like that worker admins can set resources for zimfarm and don't have to entirely donate all host resources to the worker.

I like it too (even I would recommend to do it with VMs so that isolation is more realist, but it is not a requirement, we must support both scenarii)

However here issue was opposite: disk declared by owner was 1TB (whole disk size) while in fact only 30G was available in /var due to advanced partitioning scheme (worker owner expected /var to contain only logs). It made it hard to realize that disk full errors where real and not a bug.

[rgaudin]

Is the doc misleading or was it overlooked?

[benoit74]

When I read the doc, I understand that Zimfarm data will be stored in ZIMFARM_ROOT, but this is wrong. Or at least zimit scraper / zimit configuration is not respecting a Zimfarm constraints (I've never heard of before, or at least forgotten) that every big stuff must be pushed in /output. It looks like only /output (inside the container) in mounted to {ZIMFARM_ROOT}/data/{uuid}. Everything else is left in /var, not only logs. And zimit is pushing its warc to /crawls subfolder.

[rgaudin]

Everything else is left in /var, not only logs.

Yes, everything else is not managed and thus handled by docker. Those container data as well as image data are the reason we recommend to change the default folder. We should not mention logs there as it's misleading IMO.

And zimit is pushing its warc to /crawls subfolder.

That's a zimit bug that must be opened.

[benoit74]

We should not mention logs there as it's misleading IMO.

Yes, this is what misled me at least

That's a zimit bug that must be opened.

Double checking, it is not indeed. I.e. by default zimit creates WARCs in a temporary subfolder of /output, see --cwd below

[zimit::2024-05-27 08:09:51,768] INFO:Running browsertrix-crawler crawl: crawl --failOnFailedSeed --waitUntil load --title Zimit test website --description A test website for Zimit --depth 0 --timeout 90 --lang eng --behaviors autoplay,autofetch,siteSpecific --behaviorTimeout 90 --diskUtilization 90 --url https://tmp.kiwix.org/ci/test-website/ --userAgentSuffix +Zimit contact+zimfarm@kiwix.org --mobileDevice Pixel 2 --cwd /output/.tmpsdqb2yyl --statsFilename /output/crawl.json

[kevinmcmurtrie]

Docker has multiple storage drivers.

I'm using ZFS because it works really well for Docker and hybrid disk+NVMe storage. Docker uses ZFS snapshots for layers. Compression+dedup is on for Docker layers and $ZIMFARM_ROOT/data has compression. It's not an uncommon setup. df and du won't work like you think they would.