Monitor OpenHAB with Nagios

[Marcolino]

Hi,

I need to integrate Nagios to OpenHAB to handle the notification of Warning and Alarm.

I would like to know if OpenHAB expose some Webservices or something else to query Item Status.

Thanks

[zmtgm...@gmail.com]

If I understand you right you want to monitor openhab with nagios?

Openhab has a powerfull REST API for this:
https://github.com/openhab/openhab/wiki/REST-API

regards,
Grischa

[Steve Cliffe]

As Mark said, the REST API is the way to go if you want to check specific items. 

I'm using the following check command to check the health of OpenHAB itself:

# 'check_openhab' command definition

define command{

        command_name    check_openhab

        command_line    $USER1$/check_http -H $HOSTALIAS$ -I $HOSTADDRESS$ -p 8080 -k "Accept: text/html"

        }

Steve.

[Marcolino]

Many Thanks to Grischa and Steve.

Steve,

how do you parse results? Can you post me some example on how you read a temperature sensor in example?

Many Thanks

Marco

[Steve Cliffe]

I'm not actually monitoring items in OpenHAB with Nagios - just checking that OpenHAB itself is running (i.e. listening on port 8080). 

Steve.

[zmtgm...@gmail.com]

how do you parse results? Can you post me some example on how you read a temperature sensor in example?

Look at this:

http://serverfault.com/questions/35040/nagios-monitoring-text-on-a-website

with this you can check states with fixed strings (open,close,on,off) like:

http://localhost:8080/rest/items/Window_FF_Office/state

[Marcolino]

Hi all,

and thanks to all for lots of ideas.

In the end, i moved to json request to REST.

I do a request like this: 

http://myserver.home:8080/rest/items/ACQUARI_TF_TEMP?type=json

and I get back:

{"type":"NumberItem","name":"ACQUARI_TF_TEMP","state":"25.3","link":"http://192.168.1.72:8080/rest/items/ACQUARI_TF_TEMP"}

Now I use this nagios plugin to parse JSON and ger state:

http://exchange.nagios.org/directory/Plugins/Websites,-Forms-and-Transactions/check_json--2D-check-JSON-attributes-via-http(s)/details

With this polugin I can check if value is greater or lower than a treashold using nagios syntax: https://nagios-plugins.org/doc/guidelines.html#THRESHOLDFORMAT

This is my command:

Inserisci qui il codicedefine command{
	command_name check_openhab
	command_line $USER1$/check_json.pl --url http://myserver.home:8080/rest/items/$ARG1$?type=json --attribute {state} --warning $ARG2$ --critical $ARG3$ -o {state}
}
...

ARG1 is the Item to ckek

ARG2 is warning level

ARG3 is critical level

All works like a charm.

Many thanks to all