Document Skill original
Rendu depuis le dépôt source en conservant titres, exemples, code, tableaux, liens et images.
Container Hardening
Secure container images and runtime configurations.
When to Use This Skill
Use this skill when:
- Building secure container images
- Hardening container deployments
- Meeting container security requirements
- Implementing defense in depth
Dockerfile Security
dockerfile
# Use minimal base image
FROM alpine:3.18
# Don't run as root
RUN addgroup -g 1001 -S appgroup && \
adduser -u 1001 -S appuser -G appgroup
# Copy with specific ownership
COPY --chown=appuser:appgroup . /app
# Remove unnecessary packages
RUN apk del --purge build-dependencies && \
rm -rf /var/cache/apk/*
# Use non-root user
USER appuser
# Read-only filesystem support
WORKDIR /appRuntime Security
bash
# Run with security options
docker run -d \
--read-only \
--tmpfs /tmp \
--security-opt=no-new-privileges:true \
--cap-drop=ALL \
--cap-add=NET_BIND_SERVICE \
--user 1001:1001 \
myapp:latestKubernetes Security Context
yaml
apiVersion: v1
kind: Pod
spec:
securityContext:
runAsNonRoot: true
runAsUser: 1001
fsGroup: 1001
containers:
- name: app
securityContext:
allowPrivilegeEscalation: false
readOnlyRootFilesystem: true
capabilities:
drop: ["ALL"]Image Scanning
bash
# Scan with Trivy
trivy image --severity HIGH,CRITICAL myapp:latest
# Use distroless images
FROM gcr.io/distroless/static-debian11Best Practices
- Use minimal base images
- Run as non-root user
- Enable read-only filesystem
- Drop all capabilities
- Scan images regularly
- Sign and verify images
- Use secrets management
Related Skills
- container-scanning - Vulnerability scanning
- kubernetes-hardening - K8s security
