Cloudron instance scaling issues after a few hours / couple of days, apps responsive but showing a permanent "Starting..." status

[james]

I have reviewed the data and could find anything really suspicious.

[uwcrbc]

@james said in Cloudron instance scaling issues after a few hours / couple of days, apps responsive but showing a permanent "Starting..." status:

I have reviewed the data and could find anything really suspicious.

"couldn't find....." ?

How do we go from there? Happy to enable remote SSH support if helpful.

Many thanks,

[nebulon]

@uwcrbc please send a mail with your Cloudron ID / dashbaord domain info to support@cloudron.io and enable remote ssh support for us, so we can take a closer look to get this resolved.

[uwcrbc]

@nebulon Hi @nebulon - Thanks for this. Email sent.

[nebulon]

We got the info and are looking into this. The findings so far are, that the calcom app is constantly restarting and causing the server to become very slow. Not sure why this seems to have cascading effects, since the resources are plenty, but depending on the server provider, the virtual CPUs might get throttled if one core is used 100% over a longer period of time. Will keep this updated on the findings.

[uwcrbc]

@nebulon Interesting.
The server provider is ssdnodes - So far I have had nothing to complain about (just about the opposite). Happy to play the liaison part should we need to relay info / ask questions of them.
Many thanks,

[uwcrbc]

Also: interestingly the moment the server started playing up is indeed the moment that I had roughly linked to our latest cal.com deployment.
I say latest because this Cloudron server had a previous cal.com app instance that we used as a test a while back - not sure if relevant but maybe it can help inform the situation.

[nebulon]

I've updated the calcom instance on that server to latest, which has some fixes in the package. So far things seem fine.

[uwcrbc]

Happy to report that the updated cal.com package seems to have fixed the underlying server issue.
Many thanks,

[uwcrbc]

At last - I think I was too eager to see this resolved.
The problem is still there with the exact same symptoms.
How can we proceed further? @nebulon @james Would another remote troubleshooting/debugging be helpful?

[nebulon]

Do you see a constant process showing up in htop or so on your system, which may constantly hog some core like calcom restart did?

[uwcrbc]

@nebulon Thanks - To the untrained eye, there is nothing in htop that pops up as flagrantly hogging resources.
The swap is high but I am not sure if this is a relevant indicator

[nebulon]

And the systemctl restart box still fixes the issue temporarily?

[uwcrbc]

@nebulon Yes - this fixes the issue temporarily at least

[girish]

This is probably happening because the apphealthmonitor is getting stuck (for some reason) and thus unable to update the health of apps. @uwcrbc in the box.log , do you see a line printed every 10 seconds like box:apphealthmonitor app health: xx ?

[uwcrbc]

@girish Thanks for this - After looking into the box.log:

• post systemctl restart box I do see indeed box:apphealthmonitor app health: xx running / 0 stopped / 0 unresponsive entry type every 10 seconds or so.
• pre systemctl restart box (when we experience the issue) I do not see much of the box:apphealthmonitor app health:xx entries. Rather, I do have a few rare box:apphealthmonitor setHealth: <<CONTAINER_UID>> (<<URL>>) waiting for 1192.461 to update health entries

Hopefully it helps?

[girish]

@uwcrbc I think there is a bug that the apphealthmonitor is getting stuck (for some reason). We have seen this happen but very rarely and not reproducibly . If you can give us access, can you send me a mail at support@cloudron.io ? I can debug this further .

[Neiluj]

This post is deleted!

[uwcrbc]

@girish Thanks for this. Access given / mail sent. Appreciate the help.