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A multi-stage build uses multiple FROM statements in a single Dockerfile. The first stage installs dependencies and compiles your code. The second stage copies only the final artifacts into a minimal base image. This dramatically reduces the final image size — often 5-10x smaller — because build tools, dev dependencies, and intermediate files are left behind in the discarded build stage.
Running as root inside a container is a security risk. If an attacker exploits a vulnerability in your app, they gain root access to the container — and potentially the host through container escapes. Creating a dedicated non-root user with minimal permissions limits the blast radius. Most orchestrators (Kubernetes, ECS) also enforce or recommend non-root by default.
Exclude everything not needed to build or run the app: node_modules, __pycache__, .git, .env files, test directories, documentation, IDE configs, and local build artifacts. This speeds up context transfer, prevents secrets from leaking into the image, and avoids cache-busting when unrelated files change.
A HEALTHCHECK instruction tells Docker how to test whether your container is still working. Docker runs the specified command at a set interval. If the command returns a non-zero exit code, the container is marked unhealthy. Orchestrators like Docker Swarm and Kubernetes use this signal to restart failed containers or stop routing traffic to them.
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