Logstash Events

Before starting

• You can send events from a central server, a remote server or a poller.
• By default, this stream connector sends host_status and service_status events. The event format is shown there.
• Aformentioned events are fired each time a host or a service is checked. Various parameters let you filter out events.

Installation

Login as root on the Centreon central server using your favorite SSH client.

Run the command according on your system:

Alma / RHEL / Oracle Linux 8

dnf install centreon-stream-connector-logstash

Alma / RHEL / Oracle Linux 9

dnf install centreon-stream-connector-logstash

Debian_11

apt install centreon-stream-connector-logstash

Configuration

To configure your stream connector, you must head over the Configuration --> Poller --> Broker configuration menu. Select the central-broker-master configuration (or the appropriate broker configuration if it is a poller or a remote server that will send events) and click the Output tab when the broker form is displayed.

Add a new generic - stream connector output and set the following fields as follow:

Field	Value
Name	Logstash events
Path	/usr/share/centreon-broker/lua/logstash-events-apiv2.lua
Filter category	Neb

Add Logstash mandatory parameters

Each stream connector has a set of mandatory parameters. To add them you must click on the +Add a new entry button located below the filter category input.

Type	Name	Value explanation	Value exemple
string	http_server_url	the url of the logstash http plugin	https:/mylogstash.test
number	port	the port of your logstash http plugin	8443

Add Logstash optional parameters

Some stream connectors have a set of optional parameters dedicated to the Software that they are associated with. To add them you must click on the +Add a new entry button located below the filter category input.

Type	Name	Value explanation	default value
string	username	the username if your are using https with basic auth for your logstash http plugin
string	password	the password of your user if you are using https with basic auth for your logstash http plugin
string	logfile	the file in which logs are written	/var/log/centreon-broker/logstash-events.log
number	log_level	logging level from 1 (errors) to 3 (debug)	1

Standard parameters

All stream connectors can use a set of optional parameters that are made available through Centreon stream connectors lua modules.

All those parameters are documented here.

Some of them are overridden by this stream connector.

Type	Name	Default value for the stream connector
string	accepted_categories	neb
string	accepted_elements	host_status,service_status

Event bulking

This stream connector is compatible with event bulking. Meaning that it is able to send more that one event in each call to the Logstash HTTP plugin.

To use this feature you must add the following parameter in your stream connector configuration.

Type	Name	Value
number	max_buffer_size	more than one

Event format

This stream connector will send event with the following format.

service_status event

{
  "event_timestamp": 1653434348,
  "hostname": "my-host",
  "output": "[CRITICAL] low power",
  "service": "my-service",
  "state": "CRITICAL",
  "title": "CRITICAL: my-host, my-service"
}

host_status event

{
  "event_timestamp": 1653434348,
  "hostname": "my-host",
  "output": "[DOWN] server is down",
  "state": "DOWN",
  "title": "DOWN: my-host"
}

Custom event format

This stream connector allows you to change the format of the event to suit your needs. Only the event part of the json is customisable. It also allows you to handle events type that are not handled by default such as ba_status events.

In order to use this feature you need to configure a json event format file and add a new stream connector parameter.

Type	Name	Value
string	format_file	/etc/centreon-broker/logstash-events-format.json

The event format configuration file must be readable by the centreon-broker user

To learn more about custom event format and templating file, head over the following documentation.

Curl commands

Here is the list of all the curl commands that are used by the stream connector.

Send events

curl -X PUT -H "accept: application/json" curl -X PUT 'http://<logstash_address>:<logstash_port>' -d '{"event_timestamp": 1653434348,"hostname": "my-host","output": "[DOWN] server is down","state": "DOWN","title": "DOWN: my-host"}'

You must replace all the <xxxx> inside the above command with their appropriate value. <logstash_port> may become 8080.