Free Docker Helper

The Dockerfile generator supports 8 languages with optimized base images: Node.js (node:20-alpine), Python (python:3.12-slim), Go (golang:1.22-alpine with multi-stage), Java Maven (maven:3.9-eclipse-temurin-21 + eclipse-temurin:21-jre), Java Gradle (gradle:8-jdk21 + eclipse-temurin:21-jre), PHP (php:8.3-cli-alpine), Ruby (ruby:3.3-alpine), Rust (rust:1.78-alpine with multi-stage), and .NET (mcr.microsoft.com/dotnet/sdk:8.0 + runtime).

By default, the generator produces a production-optimized Dockerfile: Alpine or Slim base images, npm ci --only=production (not npm install), non-root USER, and multi-stage builds for compiled languages (Go, Rust, .NET, Java) where the build stage is discarded. The "Multi-stage build" checkbox adds an explicit builder stage. For development, you may want to add volume mounts and hot-reload — use the Docker Compose mode for that.

The compose generator creates a single-service template. To add a database, enter the dependency name in the "Depends on" field (e.g., "db"), then manually add a service block for it in the output. Typical additions: a db service using postgres:16-alpine or redis:7-alpine with a named volume for persistence. The generated output serves as a starting point — you control the full stack.

Yes. All generated Dockerfiles, run commands, and compose files follow the OCI (Open Container Initiative) standard, which Podman also implements. The docker run command can be used directly with Podman by replacing docker with podman. Docker Compose files work with podman-compose or Podman's built-in compose support (podman v4+). Minor differences may exist in network modes and volume permission handling.

Alpine Linux images are typically 5-7 MB (vs 100MB+ for full Debian/Ubuntu images), which means faster pulls, less disk usage, and a smaller attack surface. Slim images strip documentation and build tools while keeping the glibc-based userland. Both reduce CVE counts compared to full images. The trade-off: Alpine uses musl libc instead of glibc, which can cause compatibility issues with some native modules — if you hit this, switch to the Slim variant instead.