Question 1

How to secure Docker containers from host attacks?

Accepted Answer

The guidelines recommend dropping unnecessary capabilities with --cap-drop, avoiding privileged containers, and using SELinux/AppArmor via --security-opt to enforce mandatory access controls and reduce escalation risks.

Question 2

Is Docker Secure Deployment Guidelines still relevant today?

Accepted Answer

While it provides a solid foundation, it's based on Docker 1.4.0 from 2014, so you should supplement it with current Docker security docs and tools like Docker Bench for Security for up-to-date practices.

Question 3

Docker security vs Kubernetes security: which should I focus on?

Accepted Answer

Docker security hardens containers and hosts, as covered here, while Kubernetes security adds orchestration-layer controls. This guide is great for Docker-level hardening but doesn't address Kubernetes-specific issues like pod security policies.

Question 4

How to enable SELinux for Docker containers?

Accepted Answer

Use the --security-opt argument with label options, as shown in the guidelines with examples like --security-opt=label:level:s0:c100,c200, and ensure the Docker daemon is started with --selinux-enabled.

Question 5

What are the risks of using privileged Docker containers?

Accepted Answer

Privileged containers can access all host devices and bypass security modules, increasing attack surface. The guidelines strongly advise against --privileged and suggest minimizing privileges with -u for user mapping.

Question 6

How to limit Docker container resources with cgroups?

Accepted Answer

Set CPU, memory, and storage limits using commands like --cpuset for CPU, -m for memory, and --storage-opt dm.basesize for storage, as detailed in the guidelines to prevent denial-of-service attacks.

Docker Secure Deployment Guidelines

What is Docker Secure Deployment Guidelines?

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