Monitoring Containers App

A simple application for monitoring Docker containers. It consists of four services:

1. Backend (Go + Gin + Goose)

   • Provides a REST API for reading/writing container data.
   • Connects to PostgreSQL.
   • Runs database migrations using Goose.
   • Includes a CORS middleware for the frontend.

2. Frontend (React/TypeScript, built with pnpm + nginx)

   • Displays a list of containers, their IP addresses, status, and last updated time.
   • Communicates with the Backend via REST calls.

3. Pinger (Go)

   • Periodically polls the Docker Engine (via /var/run/docker.sock).
   • Retrieves containers’ info (ID, name, IP, status).
   • Sends the data to the Backend via POST /api/containers.

4. PostgreSQL (official postgres image)

   • Stores container information in the containers table.
   • Goose keeps track of migrations in the goose_db_version table.

StartUP

docker-compose build
docker-compose up -d

or  

docker-compose up --build

Check that everything is running:

• Frontend: http://localhost:80
• Backend: http://localhost:8080/api/containers (Should return a JSON array, e.g. [] if empty.)
• Pinger: check logs with docker-compose logs -f pinger. It should log messages like “Pinger is running…” every 10 seconds.
• PostgreSQL: by default listens on port 5432 inside the container. It is not mapped outside unless you configure it in docker-compose.yml.