containerization

containerization is a skill for Claude Code, Codex from RedHatProductSecurity/prodsec-skills. It costs 33 tokens per session (943 once invoked), scanned A, original, Apache-2.0.

Security guidance for running MCP servers in containers, which package an application with its runtime and isolate it from the host system. It covers settings such as non-root users, removed Linux capabilities, read-only filesystems, and kernel protections.

In plain words
What is it for?
Containerizing MCP servers and reviewing their Docker, Kubernetes, or OpenShift security settings.
Why use it?
It reduces the damage if an MCP server is compromised and helps prevent the server from changing the host or accessing more resources than necessary.

Skill for Claude CodeCodex

Part of the prodsec-skills plugin — 133 skills shipped together

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/redhatproductsecurity/prodsec-skills/containerization
Any agent
npx skills add RedHatProductSecurity/prodsec-skills --skill containerization
Clone the repo
git clone --depth 1 https://github.com/RedHatProductSecurity/prodsec-skills

Made for: Claude Code, Codex.

Or install prodsec-skills, the plugin that ships this one along with the rest of its 133 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for containerization

README.md
[![agentmods](https://agentmods.dev/badge/skills/redhatproductsecurity/prodsec-skills/containerization.svg)](https://agentmods.dev/skills/redhatproductsecurity/prodsec-skills/containerization)
Your own site
<a href="https://agentmods.dev/skills/redhatproductsecurity/prodsec-skills/containerization"><img src="https://agentmods.dev/badge/skills/redhatproductsecurity/prodsec-skills/containerization.svg" alt="Measured on agentmods" height="20"></a>
Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 943 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00033 $0.00943
Opus 5 $0.00016 $0.00472
Sonnet 5 $0.00007 $0.00189
Haiku 4.5 $0.00003 $0.00094

Measured 5d ago against content hash 1731ee938a4d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

containerization scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

module/skills/containerization/SKILL.md · 130 lines

How it starts

The opening of the file, as written. The whole thing — 130 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Containerization and OpenShift Integration for MCP Servers

Security Recommendation

MCP servers SHOULD run in containers, leveraging container orchestration platform security features (e.g., OpenShift SCCs) for a hardened-by-default posture.

Container Security Requirements

Run as Non-Root

The container MUST run as a non-root user. OpenShift's default Security Context Constraints (SCCs) enforce this automatically.

securityContext:
  runAsNonRoot: true
  runAsUser: 1000

Drop All Capabilities

Remove all Linux capabilities and add back only what is strictly needed:

securityContext:
  capabilities:
    drop: ["ALL"]

Read-Only Root Filesystem

Use a read-only root filesystem. Mount a tmpfs only for directories that require temporary writes:

securityContext:
  readOnlyRootFilesystem: true
volumeMounts:
  - name: tmp
    mountPath: /tmp
volumes:
  - name: tmp
    emptyDir:
      medium: Memory

Kernel Hardening

Mechanism Details
SELinux Enabled by default in OpenShift; confines container processes
seccomp Apply seccomp profiles to restrict available system calls
securityContext:
  seccompProfile:
    type: RuntimeDefault
  seLinuxOptions:
    type: container_t

Network Policies

Use Kubernetes NetworkPolicies as a pod-level firewall to control all ingress and egress traffic:

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: mcp-server-policy
spec:
  podSelector:
    matchLabels:
      app: mcp-server
  policyTypes: ["Ingress", "Egress"]
  ingress:
    - from:
        - podSelector:
            matchLabels:
              app: mcp-client
      ports:
        - port: 8080
  egress:
    - to:
        - podSelector:
            matchLabels:
              app: auth-server
      ports:
        - port: 443

Base Image Selection

  • Use a Universal Base Image (UBI) from the official Red Hat Container Registry as the foundation for MCP server containers
  • Prefer ubi-minimal to reduce attack surface and installed package count
  • Use the most up-to-date image available
  • For Red Hat Catalog images, omit floating tags to ensure the latest image is pulled (exception: Konflux uses digest-based pinning with automated updates)
  • For non-Red Hat images, pin the version or digest to prevent pulling a tampered image
  • Remove non-essential packages and clean caches:

Read the full file on GitHub · 130 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 5d ago First seen · 130 lines · 33 tokens per session scan A 1731ee938a4d

Subscribe to this mod's changes

containerization is a skill published in the GitHub repository RedHatProductSecurity/prodsec-skills (52 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 33 tokens to every session and 943 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Related

Other skills, from other repositories

deploy-docker-compose

Run the Omnigent server as a Docker compose stack (server + Postgres) on any Docker host — your laptop, a VPS, EC2 by hand, or as the base layer of any container-platform deploy. Invoke when the user wants to build the image, bring up the compose stack, debug the stack on a host they already have, or extend the stack…

omnigent-ai/omnigent · 84 tokens

compute-env-setup

Set up a reproducible Feynman compute environment for research jobs. Use when a task needs Python/R packages, GPU libraries, containers, Modal, SSH, caches, or managed model runtime setup.

companion-inc/feynman · 45 tokens

securing-kubernetes-on-cloud

This skill covers hardening managed Kubernetes clusters on EKS, AKS, and GKE by implementing Pod Security Standards, network policies, workload identity, RBAC scoping, image admission controls, and runtime security monitoring. It addresses cloud-specific security features including IRSA for EKS, Workload Identity for…

xalgorix/xalgorix · 80 tokens

detecting-privilege-escalation-in-kubernetes-pods

Detect and prevent privilege escalation in Kubernetes pods by monitoring security contexts, capabilities, and syscall patterns with Falco and OPA policies.

xalgorix/xalgorix · 40 tokens

implementing-rbac-hardening-for-kubernetes

Harden Kubernetes Role-Based Access Control by implementing least-privilege policies, auditing role bindings, eliminating cluster-admin sprawl, and integrating external identity providers.

xalgorix/xalgorix · 41 tokens

docker-socket-mount

Docker / containerd socket mounted into a container → host RCE. Common in CI runners, GitOps controllers (ArgoCD, Flux), and 'Docker-in-Docker' setups. Single-command escape via docker run --rm --privileged -v /:/host alpine chroot /host.

PurpleAILAB/Decepticon · 67 tokens