Using service output as host var

Icinga 2
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1

Hi everyone,
I’m monitor some Proxmox virtual machines with Icinga and I wish to add the information about the virtual machine ID and the node name which is serving it.

As these info can change I’m thinking about adding two services with a custom check script which get these info from the Proxmox API.

Anyway I would also like to have these info as host var in order to use them as search filter on hosts.

Is there any possibility to have the output of a check command ad host var?

If not, do you have any other ideas to achieve what I want? Maybe some custom Icingaweb2 plugin?

Thank you very much!
Bye

2

How often does this change?

It sounds like a job for the Director automation.

1 Like
3

How often does this change?

Not so frequently, but the change is not predictable and can happen in any moment.

It sounds like a job for the Director automation.

Unfortunately I’m not using the Director yet…
Yes I know, I really need to upgrade to Director, but unfortunately my custom Ansible roles do not support Director yet and this is a task I want to achieve during the current year…

4

I asked about frequency as it would require a config reload.
Maybe I can interest you in:

5

I don’t want to reload config when that change, this is because I asked if it would be possible to have an host var which takes is value from the output of a service check.

6

Sorry, don’t think it is currently possible at runtime.

What is your use case? Maybe there is an other way then host vars?

7

you can use icinga api to add these variables to the host.
having a script that knows the icinga vm hosts, get information via proxmox api and write it directly to the icinga host via icinga api on a specified interval.

https://icinga.com/docs/icinga-2/latest/doc/12-icinga2-api/#modifying-objects
The following example updates the address attribute and the custom variable os for the example.localdomain host:

curl -k -s -S -i -u root:icinga -H 'Accept: application/json' \
 -X POST 'https://localhost:5665/v1/objects/hosts/example.localdomain' \
 -d '{ "attrs": { "address": "192.168.1.2", "vars.os" : "Windows" }, "pretty": true }'
8

Thanks!
So host vars can be changed at runtime through the Icinga API?

Wonderful!

9

yes :slight_smile:
these changes are stored in /var/lib/icinga2/modified-attributes.conf
It also survives a director redeploy so be careful with that.
Keep in mind that you need an api user (not icignaweb2 user) configurable in /etc/icinga2/conf.d/api-users.conf

10

But I’m not using the Director actually.
Would this work anyway?

11

yes, but try it out and report back