---
id: "kb-2026-00124"
title: "Docker Security Best Practices"
schema_type: "TechArticle"
category: "computer-science"
language: "en"
confidence: "medium"
last_verified: "2026-06-01"
created_date: "2026-05-22"
generation_method: "human_only"
derived_from_human_seed: true
conflict_of_interest: "none_declared"
is_live_document: false
data_period: "static"
atomic_facts:
  - id: "af-docker-security-1"
    statement: "Docker security documentation states that containers share the host machine's kernel."
    source_title: "Docker Engine security"
    source_url: "https://docs.docker.com/engine/security/"
    confidence: "medium"
  - id: "af-docker-security-2"
    statement: "Docker build best-practices documentation recommends choosing minimal base images that contain only the required tools and libraries."
    source_title: "Building best practices"
    source_url: "https://docs.docker.com/build/building/best-practices/"
    confidence: "medium"
  - id: "af-docker-security-3"
    statement: "Docker build best-practices documentation recommends using multi-stage builds to keep final images smaller and reduce build artifacts in runtime images."
    source_title: "Building best practices"
    source_url: "https://docs.docker.com/build/building/best-practices/"
    confidence: "medium"
  - id: "af-docker-security-4"
    statement: "Docker rootless mode documentation describes running the Docker daemon and containers as a non-root user."
    source_title: "Rootless mode"
    source_url: "https://docs.docker.com/engine/security/rootless/"
    confidence: "medium"
  - id: "af-docker-security-5"
    statement: "For AI agents editing Dockerfiles, security review should include base image choice, user privileges, dependency installation, exposed ports, secrets handling, and image size."
    source_title: "Building best practices"
    source_url: "https://docs.docker.com/build/building/best-practices/"
    confidence: "medium"
completeness: 0.84
known_gaps:
  - This article covers Docker documentation-backed practices, not every container runtime or Kubernetes admission-control policy.
  - Image vulnerability status changes over time and must be checked against the actual image digest.
disputed_statements: []
primary_sources:
  - id: ps-docker-security-1
    title: "Docker Engine security"
    type: "documentation"
    year: 2026
    institution: "Docker"
    url: "https://docs.docker.com/engine/security/"
  - id: ps-docker-security-2
    title: "Building best practices"
    type: "documentation"
    year: 2026
    institution: "Docker"
    url: "https://docs.docker.com/build/building/best-practices/"
  - id: ps-docker-security-3
    title: "Rootless mode"
    type: "documentation"
    year: 2026
    institution: "Docker"
    url: "https://docs.docker.com/engine/security/rootless/"
secondary_sources: []
updated: "2026-06-01"
---

## TL;DR

Docker security starts from the fact that containers share the host kernel. AI agents should treat Dockerfile edits as security-sensitive changes, especially when changing base images, user privileges, dependency installation, or runtime capabilities.

## Core Explanation

Container isolation is useful, but it is not the same as a full virtual machine boundary. Docker documentation emphasizes the shared-kernel model. Build guidance also encourages minimal images and multi-stage builds, which reduce unnecessary runtime contents.

Rootless mode can reduce the risk of running the Docker daemon and containers as root, but it is not a universal substitute for image review, secret management, vulnerability scanning, and runtime policy.

## Detailed Analysis

When an AI coding agent edits a Dockerfile, it should produce a reviewable diff and call out:

- base image and tag or digest;
- whether the final runtime stage contains build tools;
- whether the container runs as root;
- what ports and filesystem paths are exposed;
- where secrets enter the build or runtime;
- how the image will be scanned and deployed.

For game servers, video workers, and AI inference services, the same rule applies: keep the runtime image small, explicit, and reproducible. If the agent cannot verify a dependency or base image, it should mark that as a review item rather than silently upgrading.

## Further Reading

- [Docker Engine security](https://docs.docker.com/engine/security/)
- [Docker build best practices](https://docs.docker.com/build/building/best-practices/)
- [Docker rootless mode](https://docs.docker.com/engine/security/rootless/)

## Related Articles

- [Container Orchestration](/computer-science/container-orchestration-kubernetes-architecture-scheduling-and-service-mesh/)
- [OAuth 2.0: Authorization Framework and Security Best Practices](/computer-science/oauth-2-0-authorization-framework-and-security-best-practices/)
- [Code Review Best Practices](/computer-science/code-review-best-practices/)