ReMo

A reactive server monitoring system

This simple project is a Node.js centralised server monitoring system written in Typescript, with a distributed reactive mechanism. All communication among nodes is obtained via MQTT. User alerting uses a Telegram BOT.

Installation

Installation is the same on the monitoring server and on the monitored ones.

• clone this repository
• enter local repo directory
• run npm install
• run npm install --global
• create a /etc/monitor-config.json file and insert the following JSON:

    {
      "clientId": "client",
      "serverId": "server",
      "serverListPath": "/etc/server-list.json",
      "serviceListPath": "/etc/service-list.json",
      "telegramToken": "<your token here>",
      "telegramChatId": -1,
      "mqttUrl": "mqtt://test.mosquitto.org:1883",
      "mqttBaseTopic": "server-monitor"
    }

• customise it with your own parameters

Satellite configuration

Satellites need a serviceListPath, defined in the monitor-config.json file. The structure of the service list is a JSON array with the following structure:

[
  {
    "id": "Google",
    "url": "https://www.google.it/",
    "interval": 1,
    "restartCommand": "initctl restart <service name>"
  }
]

• id - id of the monitored service
• url - the URL to be monitored
• interval - unimplemented - desired interval between checks
• restartCommand - linux command to be executed to restart the service in case it is found not responding

Running

On the monitoring server: sudo remo-server

On each monitored server: sudo remo-satellite