VerneMQ Restapi
Overview
VerneMQ is a scalable and open source MQTT broker that connects IoT, M2M, Mobile, and web applications The VerneMQ Monitoring Connector monitors Clusters, Listeners, Plugins, and sessions using the RestAPI.
Monitoring Connector Assets
Monitored Objects
- VerneMQ including Clusters, Listeners, Plugins, Sessions
Collected Metrics
More information about collected metrics is available in the official VerneMQ documentation : https://docs.vernemq.com/monitoring/introduction
- Clusters
- Listeners
- Plugins
- Sessions
| Metric name | Description | Unit |
|---|---|---|
| status | Status of clusters | |
| clusters.running.count | Number of clusters running | count |
| clusters.notrunning.count | Number of cluster not running | count |
| Metric name | Description | Unit |
|---|---|---|
| status | Status of listeners | |
| listeners.running.count | Number of listeners running | count |
| listeners.notrunning.count | Number of listeners not running | count |
| Metric name | Description | Unit |
|---|---|---|
| plugins.total.count | Total number of plugins | count |
| Metric name | Description | Unit |
|---|---|---|
| sessions.online.count | Number of sessions online | count |
| sessions.total.count | Total number of sessions | count |
Prerequisites
A number of distributions provide VerneMQ, including pre-built binary packages. Support for these builds, if any, is being provided by the associated distribution vendor. Their release cycle may lag behind VerneMQ source releases.
More information is available on the official documentation of VerneMQ : https://docs.vernemq.com/getting-started
The VerneMQ HTTP API is enabled by default and installs an HTTP handler on http://myvernemq.com:8888/api/v1.
The centreon-engine user performs a RestAPI request to this system.
You must have generated one Token on VerneMQ server with the following command :
$ vmq-admin api-key create
More information on VerneMQ HTTP API on : https://docs.vernemq.com/administration/http-administration#managing-api-keys
Setup
- Online License
- Offline License
- Install the Centreon Plugin on every Poller monitoring VerneMQ resources:
yum install centreon-plugin-Applications-Vernemq-Restapi.noarch
- On the Centreon Web interface in Configuration > Monitoring Connectors Manager, install the VerneMQ RestAPI Monitoring Connector
- Install the Centreon Plugin on every Poller monitoring VerneMQ resources:
yum install centreon-plugin-Applications-Vernemq-Restapi.noarch
- On the Centreon Central server, install the Centreon Monitoring Connector from the RPM:
yum install centreon-pack-applications-vernemq-restapi.noarch
- On the Centreon Web interface in Configuration > Monitoring Connectors Manager, install the VerneMQ RestAPI Monitoring Connector
Configuration
Adding a Host into Centreon, link it to the Template named App-Vernemq-Restapi-custom. Once the template applied, some Macros have to be configured:
| Mandatory | Name | Description |
|---|---|---|
| X | APIPORT | Port used. Default is 8888 |
| X | APIPROTO | Protocol used. Default is http |
| X | APIKEY | VerneMQ API Token |
| APIEXTRAOPTIONS | Any extra option you may want to add to the command |
FAQ
How to check in the CLI that the configuration is OK and what are the main options for ?
Once the Plugin installed, log into your poller using the centreon-engine user account and test by running the following command :
/usr/lib/centreon/plugins/centreon_vernemq_restapi.pl \
--plugin=apps::mq::vernemq::restapi::plugin \
--mode='sessions' \
--hostname='myvernemq.com' \
--port='8888' \
--proto='http' \
--api-key='12342939495003' \
--warning-total='15' \
--critical-total='20' \
--verbose
OK: Sessions current online: 14, current total: 14
| 'sessions.online.count'=14;;;0; 'sessions.total.count'=14;;;15;20
The command above gets the sessions of a VerneMQ RestAPI (--mode=sessions).
It uses api-key, VerneMQ Token, (--api-key='12342939495003')
and it connects to the Host myvernemq.com (--Hostname='myvernemq.com')
on the port 8888 (--port='8888') using http (--proto='http').
/usr/lib/centreon/plugins/centreon_vernemq_restapi.pl \
--plugin=apps::mq::vernemq::restapi::plugin \
--mode='sessions' \
--help
Why do I get the following error:
UNKNOWN: 500 Can't connect to myvernemq.com:8888
This error message means that the Centreon Plugin couldn't successfully connect to the VerneMQ RestAPI.
Check that no third party device (such as a firewall) is blocking the request.
A proxy connection may also be necessary to connect to the API. This can be done by using the --proxyurl='http://proxy.mycompany:8080' option in the command.
UNKNOWN: 501 Protocol scheme 'connect' is not supported |
When using a proxy to connect to the VerneMQ RestAPI, this error message means that the Centreon Plugin library does not support the proxy connection protocol.
In order to prevent this issue, use the curl HTTP backend by adding the following option to the command: --http-backend='curl'.