Dockerfile Generator
Free online dockerfile generator tool, no installation required
About Dockerfile Generator
Produces framework-aware Dockerfiles for six targets: Node.js, Python, Go, Java, Rust, and Nginx static hosting. Each template knows the framework's base image, port, build command, and start command, and supports a single-stage or multi-stage build. A matching .dockerignore section is appended when the option is enabled.
How to Use
1. Pick a Framework from the dropdown (Node.js, Python, Go, Java, Rust, or Nginx Static). 2. Adjust Base Image and Port if the defaults do not fit. 3. Edit Build Command and Start Command (Python's pip install command, Java's build tool of Maven/Gradle, and Nginx's build output dir appear conditionally). 4. Toggle Multi-stage build and Include .dockerignore. 5. Click Generate to render the Dockerfile (plus .dockerignore) and use Copy to export.
Multi-Stage Build Behavior
With Multi-stage enabled, each template emits a builder stage that compiles the app, then a smaller production stage. Go and Rust drop to alpine:latest and add ca-certificates; Java switches to eclipse-temurin:21-jre-alpine and copies the built jar to app.jar; Nginx uses node:20-alpine as the builder and copies the configured build output dir into /usr/share/nginx/html. The .dockerignore block lists framework-specific exclusions such as node_modules, target/, __pycache__, or vendor/.
▶Why does the Java template ask for a build tool?
▶What is the Python extra field for?
▶Are the per-framework settings remembered when I switch frameworks?
▶Is my data sent to a server?
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