Logtfy

Simple log monitoring service that uses ntfy for alerts.

Details

• Logs from a specified source are continuously monitored, parsed, and used to trigger alerts that are posted to a ntfy topic.
• This is done through packages called modules - each module represents a specific source of logs.
  • For example, the ssh_logins module is used to monitor SSH logs and send an alert when someone logs in via SSH.
  • Modules are stored in the modules directory and each module must contain these 2 files:
    • logger.sh: Defines the log message source (continuously outputs log messages).
    • parser.sh: Parses an individual log and decides whether it should trigger a ntfy alert (if so, this script print a specifically formatted output containing the final alert data).
• Alerts can be sent to a user-defined ntfy server/topic, with the option to fallback to a second server/topic in case of failure.

Usage

1. Create a copy of config.default.json and name it config.json.
2. Modify config.json to suit your needs.
   • This file defines your ntfy.sh servers (server URL, credentials, and an optional prefix to append to all topic names).
     • You can define as many servers as you want, but only 1 to 2 are used (the main server, with an optional fallback).
   • This file also defines changes to the default settings per module.
     • This includes specifying a different ntfy server (and fallback) to use, customizing the topic name, disabling modules, and adding additional data to use for log collection and parsing.
   • Other details not mentioned - most property names are self-explanatory.
3. Optionally, create a copy of onExit.default.sh named onExit.sh and customize it - this file runs when the monitoring script exits for any reason. By default, it will attempt to send a ntfy alert to your configured server.
4. If you've enabled a module that grabs logs from a Kubernetes service, you'll need to run k8s/prep.sh.
5. Launch the service with run.sh
   • Alternatively, you can use the Dockerfile to build and run a Docker image.
   • You can also set it up to run as a systemd service using the example service config file logtfy.service.example.