Container Security Hardening Skill

A production-focused guide for building, scanning, and running containers securely — from Dockerfile authoring through runtime enforcement and supply chain integrity.

When to Use This Skill

• User mentions Docker security, container hardening, or Dockerfile security review
• User asks about distroless images, non-root containers, or read-only filesystems
• User wants to scan images for CVEs with Trivy, Grype, or Snyk
• User mentions seccomp, AppArmor, Linux capabilities, or runtime security
• User asks "is my Dockerfile secure?" or "how do I reduce my image attack surface?"
• User wants to sign/verify images with Cosign or generate SBOMs
• User asks about Kubernetes pod security, NetworkPolicy, or RBAC hardening
• User says "fix container CVEs" or "harden my container for production"

When NOT to Use This Skill

• The user is primarily asking about GitHub Actions CI/CD → recommend github-actions-advanced
• The user needs general Docker usage help (not security) → recommend docker-expert
• The user is working with Kubernetes orchestration beyond security → recommend kubernetes-architect
• The user needs application-level security (SQL injection, XSS) → recommend api-security-best-practices

Step 1: Understand Context Before Responding

When invoked, first detect the current state:

# Find Dockerfiles in the project
find . -name "Dockerfile*" -not -path "*/node_modules/*" | head -10

# Check for existing security tooling
ls .trivyignore .hadolint.yaml .snyk docker-compose*.yml 2>/dev/null

# Inspect base images currently in use
grep -r "^FROM" $(find . -name "Dockerfile*") 2>/dev/null

# Check if Kubernetes manifests exist
find . -name "*.yaml" -path "*/k8s/*" -o -name "*.yaml" -path "*/manifests/*" | head -10

Then adapt recommendations to:

• The tech stack (Node, Python, Go, Java — affects base image choice)
• Whether this is Docker-only or Kubernetes-deployed
• The CI platform in use (for scanner integration)
• The existing base images and how far they are from best practice

The Five Layers of Container Security

1. Image Build        → Minimal base, no secrets, non-root, read-only FS
2. Image Scanning     → CVE scanning, SBOM, secret detection, Dockerfile lint
3. Runtime Security   → Capabilities, seccomp, AppArmor, resource limits
4. Supply Chain       → Signed images, pinned digests, trusted registries
5. Kubernetes Layer   → Pod Security Admission, NetworkPolicy, RBAC, Kyverno

Work through layers in order — hardening the image first gives the most leverage. See references/base-image-comparison.md for a full size/CVE trade-off table.

Layer 1: Dockerfile Hardening

1.1 Use a Minimal Base Image

# ❌ AVOID — massive attack surface (~100–200 CVEs typical)
FROM ubuntu:latest
FROM node:20

# ✅ BETTER — slim variants (glibc, smaller apt footprint)
FROM node:20-slim
FROM python:3.12-slim

# ✅ BEST — distroless (no shell, no package manager, built-in nonroot user)
FROM gcr.io/distroless/nodejs20-debian12
FROM gcr.io/distroless/python3-debian12
FROM gcr.io/distroless/static-debian12   # Go/Rust fully-static binaries

# ✅ ALSO GREAT — Alpine (musl libc; verify app compatibility first)
FROM alpine:3.20

# ✅ ZERO ATTACK SURFACE — for fully static binaries only
FROM scratch

See references/base-image-comparison.md for the full trade-off matrix.

1.2 Multi-Stage Build — Separate Build from Runtime

Never ship build tools, compilers, or dev dependencies in a production image.

# syntax=docker/dockerfile:1

# ── Stage 1: Install & Build ──────────────────────────────
FROM node:20-slim AS builder
WORKDIR /build
COPY package*.json ./
RUN npm ci                          # Install all deps (including devDeps)
COPY . .
RUN npm run build && npm prune --production

# ── Stage 2: Runtime — minimal, no build tools ────────────
FROM gcr.io/distroless/nodejs20-debian12@sha256:<digest>
LABEL org.opencontainers.image.source="https://github.com/org/repo"
LABEL org.opencontainers.image.revision="${BUILD_SHA}"
LABEL org.opencontainers.image.licenses="MIT"
WORKDIR /app
COPY --from=builder --chown=nonroot:nonroot /build/dist        ./dist
COPY --from=builder --chown=nonroot:nonroot /build/node_modules ./node_modules
USER nonroot:nonroot                # UID 65532 — built into distroless
EXPOSE 3000
CMD ["dist/server.js"]

Go / Rust static binary pattern:

FROM golang:1.22-alpine AS builder
WORKDIR /build
COPY go.* ./
RUN go mod download
COPY . .
RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o app .

FROM scratch                        # Zero attack surface
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
COPY --from=builder /build/app /app
USER 65532:65532
ENTRYPOINT ["/app"]

1.3 Run as Non-Root User

# For debian/ubuntu-based images — create dedicated user
RUN groupadd -r appgroup --gid 10001 && \
    useradd