Dockerfile & Compose Generator
Generate a production-shaped Dockerfile, docker-compose.yml, and .dockerignore for your stack.
- Manifests are copied before source so the dependency layer stays cached when only your code changes.
- Multi-stage keeps build tooling out of the final image — a Go binary ships on alpine rather than the full toolchain.
- A
.dockerignorematters as much as the Dockerfile: without it the wholenode_modulesand.gitgo into the build context. - Change the placeholder database passwords before using compose anywhere real.
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The Dockerfile Generator produces all three files a containerised project needs — the Dockerfile itself, a docker-compose.yml for local development with an optional database, and a .dockerignore matched to your runtime. Presets cover Node, Python, Go, Java, PHP, and static sites served by nginx.
The output follows the practices that make the difference in real builds. Dependency manifests are copied before source, so the install layer stays cached when only your code changes. Multi-stage builds keep toolchains out of the shipped image — a Go binary ends up on alpine rather than the full golang image. A non-root user is created by default, since containers run as root otherwise. And CMD is written in exec form so your process runs as PID 1 and receives SIGTERM, which is what lets a container shut down cleanly instead of being killed.
FAQ
Docker caches each layer. If source is copied before dependencies are installed, any code change invalidates the install layer and reinstalls everything. Copying manifests first means the dependency layer is reused until the manifests themselves change.
It keeps build tooling out of the shipped image. A Go binary built in the golang image ships on alpine — hundreds of megabytes smaller — and a Java jar ships on a JRE rather than with Maven and the full JDK.
Containers run as root by default, so a process compromise starts with root inside the container, and that is the first step in most container escape chains. Creating an unprivileged user costs two lines and removes the easy path.
Yes. Without one, the entire directory goes into the build context — node_modules, .git, and any .env file. That slows builds and risks baking secrets into an image layer where they persist even if a later layer deletes them.
That is exec form. It runs your process as PID 1 directly, so it receives SIGTERM and can shut down cleanly. Shell form wraps it in /bin/sh, which swallows signals and causes containers to be killed rather than stopped.
They are a sound starting point that follows the caching, size, and privilege practices above. Review resource limits, secret handling, and the placeholder database passwords before deploying.