How to Use the Dockerfile and Compose Generator
Why Multi-Stage Builds?
Compiling an application requires heavy tools (like the Go SDK or Node devDependencies) that should not be in your final production image. A multi-stage build creates a temporary builder stage to compile your code, then copies only the final lightweight binary or dist folder into a minimal image. This often reduces image sizes from 1.5GB down to 50MB.
The Non-Root Imperative
By default, Docker runs processes inside the container as the root user. If an attacker finds a vulnerability in your code, they immediately gain root access to the container environment. The generator automatically injects configurations to create an unprivileged user (such as appuser or node) to run your process securely.
The Hidden Threat of .dockerignore
If you build an image without a .dockerignore file, the COPY . . command copies your local .env file — containing your live API keys — directly into the image layer. Anyone who pulls your image can extract those keys. The generator creates language-specific ignore files to prevent these data leaks automatically.
Frequently Asked Questions
How do I use the generated docker-compose.yml?
Save the generated YAML into a file named docker-compose.yml in the root of your project, next to your Dockerfile. Then run docker compose up --build -d in your terminal. Docker will build your image and start the container in the background.
What is a Docker Healthcheck?
A HEALTHCHECK instruction tells Docker exactly how to test whether your container is still working. Sometimes a Node.js or Python app crashes internally but the container process stays running. With a healthcheck enabled, Docker pings your app every 30 seconds. If it fails, Docker marks the container as unhealthy so your orchestrator can restart it automatically.