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-(event-handler)=
-
-# Event Handler
-
-## Event Handler Technology Overview
-
-Event handler allows you to execute scripts when a string that matches
-a regex or a regex with a service name appears in journald logs. You
-can pass variables, arguments, and a full matching string to the script.
-
-## How to configure Event Handler
-
-> [1. Create an event handler](#create-an-event-handler)
->
-> [2. Add regex to the script](#add-regex-to-the-script)
->
-> [3. Add a full path to the script](#add-a-full-path-to-the-script)
->
-> [4. Add optional parameters](#add-optional-parameters)
-
-## Event Handler Configuration Steps
-
-### 1. Create an event handler
-
-```{cfgcmd} set service event-handler event \<event-handler name\>
-
-This is an optional command because the event handler will be
-automatically created after any of the next commands.
-```
-
-
-### 2. Add regex to the script
-
-```{cfgcmd} set service event-handler event \<event-handler name\> filter pattern \<regex\>
-
-This is a mandatory command. Sets regular expression to match
-against log string message.
-
-:::{note}
-The regular expression matches if and only if the entire
-string matches the pattern.
-:::
-```
-
-
-### 3. Add a full path to the script
-
-```{cfgcmd} set service event-handler event \<event-handler name\> script path \<path to script\>
-
-This is a mandatory command. Sets the full path to the script.
-The script file must be executable.
-```
-
-
-### 4. Add optional parameters
-
-```{cfgcmd} set service event-handler event \<event-handler name\> filter syslog-identifier \<syslogid name\>
-
-This is an optional command. Filters log messages by
-syslog-identifier.
-```
-
-```{cfgcmd} set service event-handler event \<event-handler name\> script environment \<env name\> value \<env value\>
-
-This is an optional command. Adds environment and its value to
-the script. Use separate commands for each environment.
-
-One implicit environment exists.
-
-* ``message``: Full message that has triggered the script.
-```
-
-```{cfgcmd} set service event-handler event \<event-handler name\> script arguments \<arguments\>
-
-This is an optional command. Adds arguments to the script.
-Arguments must be separated by spaces.
-
-:::{note}
-We don't recommend to use arguments. Using environments
-is more preferable.
-:::
-```
-
-
-## Example
-
-Event handler that monitors the state of interface eth0.
-
-```none
-set service event-handler event INTERFACE_STATE_DOWN filter pattern '.*eth0.*,RUNNING,.*->.*'
-set service event-handler event INTERFACE_STATE_DOWN filter syslog-identifier 'netplugd'
-set service event-handler event INTERFACE_STATE_DOWN script environment interface_action value 'down'
-set service event-handler event INTERFACE_STATE_DOWN script environment interface_name value 'eth0'
-set service event-handler event INTERFACE_STATE_DOWN script path '/config/scripts/eventhandler.py'
-```
-
-Event handler script
-
-```none
-#!/usr/bin/env python3
-#
-# VyOS event-handler script example
-from os import environ
-import subprocess
-from sys import exit
-
-# Perform actions according to requirements
-def process_event() -> None:
-    # Get variables
-    message_text = environ.get('message')
-    interface_name = environ.get('interface_name')
-    interface_action = environ.get('interface_action')
-    # Print the message that triggered this script
-    print(f'Logged message: {message_text}')
-    # Prepare a command to run
-    command = f'sudo ip link set {interface_name} {interface_action}'.split()
-    # Execute a command
-    subprocess.run(command)
-
-if __name__ == '__main__':
-    try:
-        # Run script actions and exit
-        process_event()
-        exit(0)
-    except Exception as err:
-        # Exit properly in case if something in the script goes wrong
-        print(f'Error running script: {err}')
-        exit(1)
-```
-