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diff --git a/docs/configuration/system/eventhandler.rst b/docs/configuration/system/eventhandler.rst new file mode 100644 index 00000000..a68b3924 --- /dev/null +++ b/docs/configuration/system/eventhandler.rst @@ -0,0 +1,48 @@ +.. _event-handler: + +Event Handler +------------- + +Event handler allows you to execute scripts when a string that matches a regex appears in a text stream (e.g. log file). + +It uses "feeds" (output of commands, or a named pipes) and "policies" that define what to execute if a regex is matched. + +.. code-block:: none + + system + event-handler + feed <name> + description <feed description> + policy <policy name> + source + preset + syslog # Use the syslog logs for feed + custom + command <command to execute> # E.g. "tail -f /var/log/somelogfile" + named-pipe <path to a names pipe> + policy <policy name> + description <policy description> + event <event name> + description <event description> + pattern <regex> + run <command to run> + +In this small example a script runs every time a login failed and an interface goes down + +.. code-block:: none + + vyos@vyos# show system event-handler + feed Syslog { + policy MyPolicy + source { + preset syslog + } + } + policy MyPolicy { + description "Test policy" + event BadThingsHappened { + pattern "authentication failure" + pattern "interface \.* index \d+ .* DOWN.*" + run /config/scripts/email-to-admin + } + }
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