Device dependencies - child host sends alert along with parent on reboot

I have a PVE server and vm set as parent/child respectively in Librenms, yet when I restart the PVE node, I get 2 alerts on Telegram for both the node and the vm. Am I setting it wrong or how would I go about only getting an alert for the node and not the children devices ?



Device dependencies aren’t guaranteed to work except up/down ones using the fast ping script.

Normal polling can be out of “order”, so it won’t know the parent is down when the child is polled sometimes.

I see, is there any way to use fast ping in docker? I am already using 1min polling, but guess that’s not fast enough/relevant.

fast ping is just the name of it. If you only want 1 minute up/down alerts, I highly suggest you use it and go back to 5 minute polling.

I think all you need to do is set these settings in the webui:

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@murrant, the documentation states that it is necessary:
4: Add the following line to /etc/cron.d/librenms to allow 1 minute ping checks

*    *    * * *   librenms    /opt/librenms/ping.php >> /dev/null 2>&1

If enabled via WebUI, I still have to change cron.d?

No, that setting in the webui enables the schedule in the dispatcher service (which the docker image uses)

You do still need to run this once as stated by the docs.

./scripts/rrdstep.php -h all
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