DockerWatcher

DockerWatcher is a monitoring solution written in Go, designed to track Docker events and notify system administrators in real-time. By leveraging Docker's event system, DockerWatcher helps you stay informed about crucial changes such as container creation or termination, ensuring you are always aware of the state of your Docker environment.

Key Features

• Event Monitoring: Capture and filter events from Docker's event system.
• Multi-Platform Notifications: Receive alerts on your preferred communication platforms, including Telegram (Supported), Mattermost (Supported), Generic webhook (Supported) and more (Soon).
• Scalable Architecture: Designed with a modular approach to efficiently handle and process event data.
• Written in Go: Utilizes the powerful and efficient Go programming language for high performance and reliability.

Project Structure

DockerWatcher consists of two main services:

1. Watcher Service:

   • Collects and filters data from Docker's event system.
   • Pushes the relevant event data to the queue for further processing.

2. Notification Service:

   • Retrieves filtered event data from the queue.
   • Sends notifications to users via the configured communication platforms.

Running Modes

DockerWatcher can be run in three different modes, providing flexibility based on your requirements:

1. Watcher Mode:

   • Collects data from Docker's event system and pushes it to the queue.
   • Ideal for distributed environments where multiple instances collect data from different Docker engines.

2. Notification Mode:

   • Retrieves data from the queue and sends notifications to users.
   • Useful for centralizing the notification logic in a single service.

3. Watcher and Notification Mode:

   • Combines both watcher and notification functionalities.
   • Collects data and sends notifications in one go, simplifying the deployment.

By using lists in Redis, DockerWatcher creates queues of messages, ensuring efficient and orderly processing of events. (Also you can use dwqueue instead of redis!)

Notification Platforms

• Telegram
• Generic webhook
• Mattermost

Motivation

DockerWatcher was created to address the need for a reliable and efficient way to monitor Docker environments. By providing timely notifications about critical events, DockerWatcher helps system administrators maintain better control and oversight of their Docker containers, improving overall system reliability and responsiveness.

Usage

Build from Source Code

To build DockerWatcher from source, follow these steps:

1. Clone the Repository:

   git clone https://github.com/ravanbod/dockerwatcher.git
   cd dockerwatcher

2. Build the Project:

   go build -o dockerwatcher cmd/dockerwatcher/main.go

Build with Docker

To build DockerWatcher with docker, follow these steps:

1. Clone the Repository:

   git clone https://github.com/ravanbod/dockerwatcher.git
   cd dockerwatcher

2. Build the Project:

   docker build -t dockerwatcher:$(git describe --exact-match --tags 2> /dev/null || git rev-parse --short HEAD) -t dockerwatcher:latest .

How to run

Environment Variables

please see .env.example file. create another file like this and name it .env.

Also you can export these variables in the shell you use.

Key	Description	Optional/Required
QUEUE_TYPE	redis,dwqueue	Required
REDIS_URL		Required if qt=redis
REDIS_QUEUE_WRITE_NAME		Required if qt=redis
REDIS_QUEUE_READ_NAMES		Required if qt=redis
ENABLE_WATCHER	0 (disabled), 1 (enabled)	Required
ENABLE_NOTIFICATION	0 (disabled), 1 (enabled)	Required
GRACEFUL_SHUTDOWN_TIMEOUT	Integer (seconds)	Required
EVENTS_FILTER		Optional
NOTIFICATION_PLATFORM	generic,telegram,mattermost	Required
TELEGRAM_BOT_API_TOKEN		Required if np=telegram
TELEGRAM_CHAT_ID		Required if np=telegram
GENERIC_NOTIFICATION_URL		Required if np=generic
MATTERMOST_HOST		Required if np=mattermost
MATTERMOST_BEARER_AUTH		Required if np=mattermost
MATTERMOST_CHANNEL_ID		Required if np=mattermost

*qt = QUEUE_TYPE *np = NOTIFICATION_PLATFORM

for example, if you want to set NOTIFICATION_PLATFORM=telegram, TELEGRAM_BOT_API_TOKEN and TELEGRAM_CHAT_ID are necessary.

REDIS_QUEUE_READ_NAMES and EVENTS_FILTER are comma seperated. watch .env.example.

for EVENTS_FILTER, see this link.

if QUEUE_TYPE is dwqueue, ENABLE_WATCHER and ENABLE_NOTIFICATION must be 1.

Run without docker

To run the project without docker, You can simply run this command (after Build from source code).

./dockerwatcher

Run with docker

To run the project with docker, You can simply run this command (after Build with docker).

docker run --name dockerwatcher -it -v $(pwd)/.env:/app/.env -v /var/run/docker.sock:/var/run/docker.sock --network dockerwatcher dockerwatcher

A redis has to be in dockerwatcher network.

Run with docker-compose (Recommended)

If you have an existing redis, you can use docker-compose.yml. else you can use docker-compose-full.yml that has redis and DockerWatcher.

Run multiple instances

It is recommended that launch a watcher service in every docker engine and use a shared Redis between them. And launch a Notification instance that sends Redis messages to your notification platform.

Run single instance without Redis

We have a built-in queue system (a simple channel :) ) that you can use that instead of Redis. the point is that you can use dwqueue when ENABLE_WATCHER and ENABLE_NOTIFICATION are 1.

Messages

You will get the messages in the markdown format. this is an example of dying mysql container.

# Docker Event 

 ## Event Details 

- **Type**: `container`
- **Action**: `die`
- **Scope**: `local`
- **Time**: `1716908784`
- **TimeNano**: `1716908784342468156`
## Actor 
- **Actor.ID**: `ab1bec9756b03eb3c12c42fe08496a94d73b037c8e60e41344ae869fd41e38cb`
  - **name**: `mysql`
  - **execDuration**: `5`
  - **exitCode**: `0`
  - **image**: `mysql`