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Dockerfile Best Practices

Checked
kentoshimizu·vlatest·cloud·Apache-2.0

Generate Dockerfiles adhering to Kentoshimizu's best practices for security, efficiency, and maintainability in cloud deployments.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add kentoshimizu/sw-agent-skills --skill dockerfile-best-practices -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

kentoshimizu

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned kentoshimizu/sw-agent-skills at 5b7bafb626.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
5b7bafb626
Manifest
skills/dockerfile-best-practices/SKILL.md
Scanned
3 files, 78 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

This skill provides guidance on writing efficient and secure Dockerfiles. It helps users optimize image size, improve build speed, and implement security best practices for containerized applications. The skill can analyze existing Dockerfiles or generate new ones based on provided specifications.

When to use it

  • You're building a new application and want to create a lean and efficient Docker image from the start.
  • Your current Docker images are large, slow to build, or potentially vulnerable.
  • You need help understanding how to apply best practices like multi-stage builds or minimizing layers.
  • You’re refactoring an existing Dockerfile for improved performance and security.

Key capabilities

  • Dockerfile analysis
  • Image size optimization suggestions
  • Security vulnerability identification in Dockerfiles
  • Generation of optimized Dockerfiles based on specifications
  • Multi-stage build implementation guidance

Example prompts

  • "Analyze this Dockerfile and suggest improvements for image size." (followed by a Dockerfile)
  • "Generate a Dockerfile for a Python application with dependencies listed in requirements.txt, using multi-stage builds."
  • "What are the security best practices I should follow when building Docker images?"

Tips & gotchas

The skill assumes basic familiarity with Docker concepts and commands. Providing clear instructions or existing Dockerfiles will yield better results.