Dockerfile 检查器
分析 Dockerfile 的最佳实践、安全问题和优化建议，提供即时反馈和可操作的改进方案。
Using `latest` tag in FROM (image: ubuntu:latest)
Pin a specific version tag, e.g. ubuntu:22.04 instead of ubuntu:latest.
ADD used where COPY would suffice
Use COPY instead of ADD for copying local files. ADD has extra features (auto-extract, remote URLs) that can be surprising.
Using `apt-get install` without `--no-install-recommends`
Add --no-install-recommends to avoid installing unnecessary packages and reduce image size.
Using `apt-get install` without `-y` flag
Add -y flag to avoid interactive prompts: apt-get install -y.
Using `apt-get install` without `--no-install-recommends`
Add --no-install-recommends to avoid installing unnecessary packages and reduce image size.
Missing `apt-get clean` or `rm -rf /var/lib/apt/lists/*` after install
Clean up apt cache in the same RUN layer to reduce image size.
Using `sudo` in Dockerfile
Avoid sudo. Use USER to switch users, or run commands as root directly (default in Docker).
EXPOSE with no port number
Specify a valid port number, e.g. EXPOSE 8080.
Missing HEALTHCHECK instruction
Add a HEALTHCHECK to let Docker know how to check that the container is still working.
Running as root — no USER instruction found
Add a USER instruction to run the container as a non-root user for better security.
CMD uses shell form instead of exec form
Use exec form: CMD ["executable", "arg1", "arg2"] for proper signal handling.
Consider using a .dockerignore file
A .dockerignore file helps exclude unnecessary files from the build context, speeding up builds and reducing image size.
4 consecutive RUN instructions found
Combine RUN instructions using && to reduce image layers.
WORKDIR should use an absolute path
Use an absolute path, e.g. WORKDIR /app instead of WORKDIR app.
AI developer workflow fit
Use Dockerfile 检查器 while building with AI coding assistants, agents, and LLM workflows: validate generated output, transform payloads, debug integrations, and prepare reliable inputs without leaving your browser.
What is Dockerfile 检查器?
Dockerfile 检查器 helps developers convert, inspect, validate, or generate dockerfile, docker, lint, linter, best practices, container directly in the browser. It is designed for everyday coding, debugging, API integration, documentation, QA, and AI-assisted development workflows where concrete input/output examples and privacy-first local processing matter.
How to use Dockerfile 检查器
- Paste, upload, or enter the dockerfile, docker, lint, linter, best practices, container input required by the tool.
- Adjust any options such as format, mode, output style, size, or validation behavior.
- Review the generated result, parsed details, warnings, or converted output in the preview area.
- Copy or download the result for tests, documentation, API debugging, game assets, or AI coding prompts.
Common Dockerfile 检查器 use cases
- Developer debugging — Use Dockerfile 检查器 to quickly inspect generated output, API payloads, configuration values, or encoded data while building and debugging software.
- AI-assisted coding workflows — Validate or transform examples produced by AI coding assistants before pasting them into source code, tests, documentation, or issue comments.
- Privacy-first browser processing — Run common dockerfile, docker, lint, linter, best practices, container tasks locally in the browser without sending sensitive development data to a backend service.