Sensu Integration

The ilert Sensu Integration helps you to publish alerts into your channels or resolve alerts.

​Sensu is a tool that functions as an observability pipeline which delivers monitoring as code on any cloud.
In ilert
Go to the "Alert sources" tab and click "Create new alert source"
Enter a name and select your desired escalation policy.
Select "Sensu" as the Integration Type and click Save.
On the next page, an API key is generated. You will need the API Key when setting up the handler in Sensu.
In Sensu
Add Sensu ilert Handler
sensuctl asset add iLert/sensu-ilert
Make sure that the asset was added to your Sensu backend. Run:
sensuctl asset info iLert/sensu-ilert
In the following command, replace <ilert_key> with your ilert API key.
Then run the updated command:
sensuctl handler create ilert \
--type pipe \
--runtime-assets iLert/sensu-ilert \
--command "sensu-ilert -t <ilert_key>"
Make sure that your handler was added by retrieving the complete handler definition in YAML or JSON format:
sensuctl handler info ilert --format yaml
Trigger an event. You can try it with the file_exists check and an ilert handler workflow in place - remove a file to cause Sensu to send a non-OK event.
You can refer to the next section for more instructions.
Triggering an event
Add system subscription to entity
Find your entity name:
sensuctl entity list
The ID in the response is the name of your entity and replace <entity_name> with the name of your entity in the sensuctl command below. Then run the command to add the system subscription to your entity:
sensuctl entity update <entity_name>
For Entity Class, press enter.
For Subscriptions, type system and press enter.
Confirm both sensu-backend and sensu-agent are running. You can use docker ps if you are running both from docker.
Add the file_exists check
Before you can add the check, you need to add the Nagios Foundation asset to your Sensu configuration:
sensuctl asset add ncr-devops-platform/nagiosfoundationCopy
To confirm that the asset was added to your Sensu backend, run:
sensuctl asset info ncr-devops-platform/nagiosfoundationCopy
The check command includes the path for the file that the check will look for on your system, /tmp/my-file.txt. For this guide, you’ll add /tmp/my-file.txt as a temporary file:
touch /tmp/my-file.txt
You should see === ncr-devops-platform/nagiosfoundation followed by a list of available builds for the asset. Now that you’ve added the Nagios Foundation dynamic runtime asset, you can add its file_exists check to your Sensu backend. Use sensuctl to add the check:
sensuctl check create file_exists \
--command "check_file_exists --pattern /tmp/my-file.txt" \
--subscriptions system \
--handlers ilert \
--interval 10 \
--runtime-assets ncr-devops-platform/nagiosfoundationCopy
To confirm that the check was added to your Sensu backend and view the check definition in YAML or JSON format,
sensuctl check info file_exists --format yaml
Trigger a file_exists check
Remove the file /tmp/my-file.txt:
rm /tmp/my-file.txtCopy
This will make sure the file is not there for Sensu to find the next time the file_exists check runs. After about 10 seconds, Sensu will detect that my-file.txt is missing and reflect that in an event. To view the event with sensuctl, run:
sensuctl event listCopy
The response should show that the file removal resulted in a CRITICAL (2) event:
     Entity         Check                                      Output                                   Status   Silenced             Timestamp                             UUID                  
 ────────────── ───────────── ──────────────────────────────────────────────────────────────────────── ──────── ────────── ─────────────────────────────── ────────────────────────────────────── 
  host01         file_exists   CheckFileExists CRITICAL - 0 files matched pattern /tmp/my-file.txt           2   false      2021-03-15 19:28:21 +0000 UTC   1b4266ae-7200-4728-a0n4-2f50f7a56613Copy
Open the Sensu web UI to see the events the file_exists check is generating. Visit http://127.0.0.1:3000, and log in as the admin user (created during initialization when you installed the Sensu backend). The failing check’s events will be listed on the Events page.
The Alert should be created on the Sensu Alert Source on ilert's side as well
To complete your workflow, restore the file that you removed so Sensu sends a resolution to ilert:
touch /tmp/my-file.txt

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Sensu Integration

In ilert

In Sensu

Triggering an event

Add system subscription to entity

Add the `file_exists` check

Trigger a `file_exists` check