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nimadorostkar
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containers

Enforce multi-stage builds and secure runtime configurations in Dockerfiles.

25|3|Updated Jul 14, 2026
Search Tags:#devops#security#build#docker#containers#dockerfile
One-click install
npx skills add https://github.com/nimadorostkar/Claude-Skills-collection --skill containers-nimadorostkar
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: containers
Source: https://github.com/nimadorostkar/Claude-Skills-collection/tree/main/skills/devops/containers
Command: npx skills add https://github.com/nimadorostkar/Claude-Skills-collection --skill containers-nimadorostkar

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This skill addresses the common pitfalls in containerization, such as bloated image sizes, insecure root-level execution, and improper signal handling that prevents graceful shutdowns.

Core Features & Use Cases

  • Optimization: Implements multi-stage builds to ensure final images contain only the necessary runtime artifacts, excluding compilers and build tools.
  • Security Hardening: Enforces non-root user execution, read-only filesystems, and proper layer ordering to minimize the attack surface.
  • Use Case: When refactoring a Dockerfile for a Node.js application, this skill guides you to move from a heavy, root-running image to a slim, distroless-based image that handles SIGTERM signals correctly.

Quick Start

Use the containers skill to audit my current Dockerfile and suggest optimizations for image size and security.

Frequently Asked Questions about containers

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I optimize Docker image size using multi-stage builds?▼

Enforce non-root execution in Dockerfiles by creating a dedicated unprivileged user and configuring the runtime to drop root privileges. This security hardening step minimizes the attack surface and prevents unauthorized root-level access in production.

Why does my Node.js container fail to handle SIGTERM signals for graceful shutdowns?▼

Containers fail to handle SIGTERM signals when running as PID 1 under improper shell wrappers, preventing graceful shutdowns. Refactoring the Dockerfile to execute the process directly and using a distroless base image ensures correct signal handling.

What is the best way to audit a Dockerfile for production readiness?▼

Auditing a Dockerfile for production readiness involves checking for multi-stage build patterns, non-root execution, read-only filesystems, and proper layer caching. This ensures the final image is hardened against vulnerabilities and optimized for size.

Can I use distroless base images to secure my containerized applications?▼

Distroless base images secure containerized applications by stripping out operating system shells and package managers, leaving only the runtime environment. This significantly minimizes the attack surface for production-grade reliability.

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