.dockerignore Generator
Generate .dockerignore files from presets for Node.js, Python, Go, Java, and more. Free, in-browser.
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What is .dockerignore Generator?
The .dockerignore Generator creates .dockerignore files from curated presets for popular languages, frameworks, editors, and CI systems. It merges your selections, removes duplicates, and lets you add custom patterns — producing a ready-to-use file that keeps Docker build contexts lean and secure.
Key Benefits
- Faster builds
- Smaller images
- Secret protection
- Better layer caching
- Offline and free
Common Use Cases
- •Containerizing existing projects
- •Slimming CI/CD build contexts
- •Preventing .env leaks into images
- •Standardizing team Docker setups
How to Generate .dockerignore Files
- Pick Your Stack: Select templates matching your project: Node.js, Python, Go, Java, or frameworks like Next.js and Vite.
- Add Editor and OS Presets: Include VS Code, JetBrains, macOS, and Windows presets to keep editor and system files out of the context.
- Exclude Secrets: Enable the Secrets preset to exclude .env files, private keys, certificates, and credentials from the image.
- Add Custom Patterns: Type any project-specific patterns, one per line. Comments starting with # are preserved.
- Copy or Download: Copy the result to your clipboard or download it as .dockerignore, then place it next to your Dockerfile.
Key Features
- Curated Presets: Ready-made pattern sets for Node.js, Python, Go, Java, Rust, .NET, PHP, Next.js, Vite, Nuxt, and more.
- Editor and OS Files: Keeps .vscode, .idea, .DS_Store, and Thumbs.db out of your build context.
- Secrets Protection: One-click preset that excludes .env files, keys, certificates, and credentials folders.
- Automatic De-duplication: Merge as many templates as you need — duplicate patterns collapse into one.
- Custom Patterns: Add project-specific ignore patterns with comment support, appended after presets.
- Copy or Download: Copy to clipboard or download a ready-to-use .dockerignore file, entirely offline.
Frequently Asked Questions
What is a .dockerignore file?
A .dockerignore file lists files and directories the Docker daemon should exclude from the build context. It works like .gitignore but for docker build, keeping the uploaded context small and preventing sensitive files from reaching image layers.
Where should I place the .dockerignore file?
Place it in the root of your build context — the same directory you pass to docker build (typically next to your Dockerfile). Patterns are resolved relative to that root.
How is .dockerignore different from .gitignore?
.gitignore controls what Git tracks in your repository, while .dockerignore controls what the Docker daemon sends to the builder. Keeping node_modules in Git-ignored but also Docker-ignored avoids uploading gigabytes on every build.
Can I combine multiple templates?
Yes. Select as many presets as you need — Node.js plus Next.js plus VS Code, for example. The generator merges the patterns and removes duplicates automatically.
Does a .dockerignore speed up Docker builds?
It does. A smaller build context uploads faster to the daemon or BuildKit, and fewer files means fewer unnecessary COPY layer invalidations, so cache hits improve on rebuilds.