kubernetes-hardening

name	kubernetes-hardening
description	Implement Kubernetes security contexts, Pod Security Standards, and network policies. Secure cluster components and workloads. Use when hardening Kubernetes deployments or meeting security compliance. Use when this capability is needed.
metadata	{"author":"BagelHole"}

Kubernetes Hardening

Secure Kubernetes clusters and workloads.

When to Use This Skill

Use this skill when:

• Hardening Kubernetes clusters
• Implementing Pod Security Standards
• Configuring network policies
• Meeting security compliance

Pod Security Standards

# Namespace with restricted policy
apiVersion: v1
kind: Namespace
metadata:
  name: production
  labels:
    pod-security.kubernetes.io/enforce: restricted
    pod-security.kubernetes.io/audit: restricted
    pod-security.kubernetes.io/warn: restricted

Security Context

apiVersion: v1
kind: Pod
metadata:
  name: secure-pod
spec:
  securityContext:
    runAsNonRoot: true
    runAsUser: 1000
    runAsGroup: 1000
    fsGroup: 1000
    seccompProfile:
      type: RuntimeDefault
  containers:
  - name: app
    image: myapp:latest
    securityContext:
      allowPrivilegeEscalation: false
      readOnlyRootFilesystem: true
      capabilities:
        drop: ["ALL"]

Network Policies

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: default-deny-all
spec:
  podSelector: {}
  policyTypes:
  - Ingress
  - Egress
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-web
spec:
  podSelector:
    matchLabels:
      app: web
  ingress:
  - from:
    - podSelector:
        matchLabels:
          app: frontend
    ports:
    - port: 8080

RBAC

apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: app-reader
rules:
- apiGroups: [""]
  resources: ["pods", "services"]
  verbs: ["get", "list"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: app-reader-binding
subjects:
- kind: ServiceAccount
  name: myapp
roleRef:
  kind: Role
  name: app-reader
  apiGroup: rbac.authorization.k8s.io

Best Practices

• Enable Pod Security Standards
• Implement network policies
• Use RBAC with least privilege
• Enable audit logging
• Secure etcd with encryption
• Use service mesh for mTLS
• Regular security scanning

Related Skills

• kubernetes-ops - K8s operations
• container-hardening - Container security

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Source: BagelHole/DevOps-Security-Agent-Skills — distributed by TomeVault.