k8s-security

Included with Lifetime

$97 forever

Use when securing Kubernetes clusters, implementing network policies, configuring RBAC, pod security standards, or asking about "Kubernetes security", "NetworkPolicy", "PodSecurityPolicy", "RBAC", "pod security standards", "OPA Gatekeeper"

Cloud & DevOps

What this skill does


# Kubernetes Security Policies

Implement defense-in-depth security for Kubernetes clusters.

## Pod Security Standards

### Restricted (Most Secure)

```yaml
apiVersion: v1
kind: Namespace
metadata:
  name: restricted-ns
  labels:
    pod-security.kubernetes.io/enforce: restricted
    pod-security.kubernetes.io/audit: restricted
    pod-security.kubernetes.io/warn: restricted
```

### Secure Pod Configuration

```yaml
apiVersion: v1
kind: Pod
metadata:
  name: secure-pod
spec:
  securityContext:
    runAsNonRoot: true
    runAsUser: 1000
    fsGroup: 1000
    seccompProfile:
      type: RuntimeDefault
  containers:
  - name: app
    image: myapp:1.0
    securityContext:
      allowPrivilegeEscalation: false
      readOnlyRootFilesystem: true
      capabilities:
        drop:
        - ALL
```

## Network Policies

### Default Deny All

```yaml
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: default-deny-all
spec:
  podSelector: {}
  policyTypes:
  - Ingress
  - Egress
```

### Allow Frontend to Backend

```yaml
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-frontend-to-backend
spec:
  podSelector:
    matchLabels:
      app: backend
  ingress:
  - from:
    - podSelector:
        matchLabels:
          app: frontend
    ports:
    - protocol: TCP
      port: 8080
```

### Allow DNS Egress

```yaml
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-dns
spec:
  podSelector: {}
  policyTypes:
  - Egress
  egress:
  - to:
    - namespaceSelector:
        matchLabels:
          name: kube-system
    ports:
    - protocol: UDP
      port: 53
```

## RBAC Configuration

### Role (Namespace-scoped)

```yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: pod-reader
rules:
- apiGroups: [""]
  resources: ["pods"]
  verbs: ["get", "watch", "list"]
```

### RoleBinding

```yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: read-pods
subjects:
- kind: ServiceAccount
  name: my-app
  namespace: production
roleRef:
  kind: Role
  name: pod-reader
  apiGroup: rbac.authorization.k8s.io
```

## OPA Gatekeeper Policies

### Required Labels Constraint

```yaml
apiVersion: templates.gatekeeper.sh/v1
kind: ConstraintTemplate
metadata:
  name: k8srequiredlabels
spec:
  crd:
    spec:
      names:
        kind: K8sRequiredLabels
  targets:
    - target: admission.k8s.gatekeeper.sh
      rego: |
        package k8srequiredlabels
        violation[{"msg": msg}] {
          provided := {label | input.review.object.metadata.labels[label]}
          required := {label | label := input.parameters.labels[_]}
          missing := required - provided
          count(missing) > 0
          msg := sprintf("missing labels: %v", [missing])
        }
```

## Service Mesh Security (Istio)

### Strict mTLS

```yaml
apiVersion: security.istio.io/v1beta1
kind: PeerAuthentication
metadata:
  name: default
spec:
  mtls:
    mode: STRICT
```

## Best Practices

1. **Pod Security Standards** at namespace level
2. **Network Policies** for segmentation
3. **Least-privilege RBAC** for all service accounts
4. **Run containers as non-root**
5. **Read-only root filesystem**
6. **Drop all capabilities** unless needed
7. **Enable audit logging**
8. **Regular image scanning**

## Troubleshooting

```bash
# Check RBAC permissions
kubectl auth can-i list pods --as system:serviceaccount:default:my-sa

# Debug NetworkPolicy
kubectl describe networkpolicy <name>
kubectl get networkpolicy -A
```

Files: 1

Size: 3.7 KB

Complexity: 13/100

Category: Cloud & DevOps

Source: https://github.com/eyadsibai/ltk/tree/main/plugins/ltk-devops/skills/k8s-security

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