Your tiny friendly rusty neighborhood monitoring CLI tool, featuring Nagios/Sensu-compatible checks
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Your friendly neighborhood monitoring CLI tool.

Just write your own Sirenfile.json like this:

  "switch_cwd": true,
  "tasks": [
      "name": "foo",
      "description": "foo description",
      "command": "echo foo"
      "name": "bar",
      "description": "bar description",
      "command": "echo bar"

Siren takes your tasks and executes them, alerting you if one of your checks fail. The checks are standard Nagios', so you can write your own checks just issuing an exit code different than 0 if something fails. When a task has its exit code equal to 0, that check is seen as successful.


cargo install siren


Once you placed your own Sirenfile into the current directory, you can run Siren:

$ siren

You can also run Siren with a different Sirenfile than the default one:

$ siren --file my/personal/checks/Sirenfile.json

JSON output

Users can decide to have a recap of all tasks in JSON format instead of the plain text/console one.

This can be done using the --json-output flag:

$ siren --json-output

This is meant for further integrations like complex systems where Siren is only a piece of the puzzle.

Configuration options

Here the fields you can configure in your Sirenfile:

  • switch_cwd: Specifies if you want the current working directory to be changed to the one containing the Sirenfile. Useful if you want to write commands relative to that relative path.
  • tasks: An array of tasks, purely. Every task has a field containing its name, a description, and a command field that gets executed as a child process.