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

[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.

[robi]

I think I have another instance of this bug with the health monitor.

I have installed an app that does not have health checks and it shows as Not Responding in the dashboard even though it works fine.

However, it seems that because of that app and the health monitor getting stuck, any new apps that get installed or upgraded also fail their health checks and remain in Starting... mode in the dashboard.

I have rebooted the server and all the apps come up, other than the one mentioned above, then after this updated apps show the Starting... message.

P.S.
It would be really nice to add the button for the 'cloudron' service, like we have for all other services.

[girish]

My home server got into a situation like this just now. It seems it's because the eventlog got flooded with many entries.

+----------+
| count(*) |
+----------+
|   563547 |
+----------+

mysql> SELECT action, COUNT(*) AS count
    -> FROM eventlog
    -> GROUP BY action
    -> ORDER BY count DESC;
+---------------------------+--------+
| action                    | count  |
+---------------------------+--------+
| app.up                    | 446592 |
| app.down                  | 106588 |
| backup.cleanup.finish     |   3664 |
| app.update.finish         |   1354 |
| app.update                |   1354 |
| backup.finish             |    920 |
| backup.start              |    920 |
| cloudron.update.finish    |    847 |
| cloudron.update           |    833 |
| cloudron.start            |    110 |
| dyndns.update             |     78 |

Those app up/down eventlogs are out of hand!

I nuked them manually:

mysql> DELETE from eventlog WHERE action='app.up';
Query OK, 446782 rows affected (8 min 1,59 sec)

mysql> DELETE from eventlog WHERE action='app.down';
Query OK, 106588 rows affected (9 min 16,27 sec)

That took a whopping 17min just to delete entries!

[robi]

Oh wow, thanks for finding that Girish!

Are you pushing fixes?
Should we do the same manually?
Does box need a restart after or will apphealthmonitor just work better w/o half a million app.up entries?

[girish]

I pushed fixes for this now.

The issue is if the mail container is down or mail is not working, then all the app up/down events accumulate (it's trying to send an email when app goes up/down). Since the fix is a bit involved, a workaround might be to disable app up/down email notifications in the Notification view (I haven't tried this though, but would have fixed my problem atleast).

[robi]

@girish I have all those notification settings disabled, so nothing to do with email for me.

Want to look around more?

[girish]

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

I have installed an app that does not have health checks and it shows as Not Responding in the dashboard even though it works fine.

Does this mean you have a custom app which does not properly to healthCheckUrl?

[robi]

@girish It's a LAMP app with apache configured to point to another directory.