kodekloud-engineer/kubernetes/cks/exam-by-claude/seed.sh

#!/usr/bin/env bash
# CKS mock — seed the cluster with the objects each task expects. Idempotent-ish.
set -euo pipefail
kubectl config use-context kind-cks >/dev/null

echo "[*] Namespaces..."
for ns in prod web dev apps restricted-ns images sysh runtime; do
  kubectl create ns "$ns" --dry-run=client -o yaml | kubectl apply -f - >/dev/null
done

# ---------- Task 1: NetworkPolicy ----------
kubectl -n prod apply -f - >/dev/null <<'EOF'
apiVersion: apps/v1
kind: Deployment
metadata: {name: db, namespace: prod, labels: {app: db}}
spec:
  replicas: 1
  selector: {matchLabels: {app: db}}
  template:
    metadata: {labels: {app: db}}
    spec:
      containers:
        - name: db
          image: hashicorp/http-echo:1.0
          args: ["-text=db-ok", "-listen=:5432"]
          ports: [{containerPort: 5432}]
---
apiVersion: v1
kind: Service
metadata: {name: db, namespace: prod}
spec:
  selector: {app: db}
  ports: [{port: 5432, targetPort: 5432}]
---
apiVersion: apps/v1
kind: Deployment
metadata: {name: frontend, namespace: prod, labels: {app: frontend}}
spec:
  replicas: 1
  selector: {matchLabels: {app: frontend}}
  template:
    metadata: {labels: {app: frontend}}
    spec: {containers: [{name: c, image: curlimages/curl:8.11.1, command: ["sleep","infinity"]}]}
---
apiVersion: apps/v1
kind: Deployment
metadata: {name: attacker, namespace: prod, labels: {app: attacker}}
spec:
  replicas: 1
  selector: {matchLabels: {app: attacker}}
  template:
    metadata: {labels: {app: attacker}}
    spec: {containers: [{name: c, image: curlimages/curl:8.11.1, command: ["sleep","infinity"]}]}
EOF

# ---------- Task 2: Ingress TLS ----------
kubectl -n web apply -f - >/dev/null <<'EOF'
apiVersion: apps/v1
kind: Deployment
metadata: {name: hello, namespace: web}
spec:
  replicas: 1
  selector: {matchLabels: {app: hello}}
  template:
    metadata: {labels: {app: hello}}
    spec:
      containers:
        - name: hello
          image: hashicorp/http-echo:1.0
          args: ["-text=hello-tls", "-listen=:5678"]
          ports: [{containerPort: 5678}]
---
apiVersion: v1
kind: Service
metadata: {name: hello, namespace: web}
spec:
  selector: {app: hello}
  ports: [{port: 80, targetPort: 5678}]
EOF

# ---------- Task 4: RBAC least-privilege (over-permissive to fix) ----------
kubectl -n dev apply -f - >/dev/null <<'EOF'
apiVersion: v1
kind: ServiceAccount
metadata: {name: ci-runner, namespace: dev}
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata: {name: ci-runner-role, namespace: dev}
rules:
  - apiGroups: ["*"]
    resources: ["*"]
    verbs: ["*"]        # WAY too broad — task: restrict to get/list/watch on pods & configmaps
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata: {name: ci-runner-rb, namespace: dev}
roleRef: {apiGroup: rbac.authorization.k8s.io, kind: Role, name: ci-runner-role}
subjects: [{kind: ServiceAccount, name: ci-runner, namespace: dev}]
EOF

# ---------- Task 6: automountServiceAccountToken ----------
kubectl -n apps apply -f - >/dev/null <<'EOF'
apiVersion: v1
kind: ServiceAccount
metadata: {name: web-sa, namespace: apps}
---
apiVersion: apps/v1
kind: Deployment
metadata: {name: web, namespace: apps}
spec:
  replicas: 2
  selector: {matchLabels: {app: web}}
  template:
    metadata: {labels: {app: web}}
    spec:
      serviceAccountName: web-sa
      containers: [{name: c, image: nginx:1.27, ports: [{containerPort: 80}]}]
EOF

# ---------- Task 9: Pod Security Admission (violating workload) ----------
kubectl -n restricted-ns apply -f - >/dev/null <<'EOF'
apiVersion: apps/v1
kind: Deployment
metadata: {name: payments, namespace: restricted-ns}
spec:
  replicas: 1
  selector: {matchLabels: {app: payments}}
  template:
    metadata: {labels: {app: payments}}
    spec:
      containers:
        - name: c
          image: nginx:1.27
          securityContext:
            privileged: true              # violates restricted
            allowPrivilegeEscalation: true
EOF

# ---------- Task 13: Trivy image scan (mixed vuln levels) ----------
kubectl -n images apply -f - >/dev/null <<'EOF'
apiVersion: v1
kind: Pod
metadata: {name: legacy-app, namespace: images, labels: {scan: "true"}}
spec:
  containers: [{name: c, image: nginx:1.19.0}]      # old, HIGH/CRITICAL CVEs
---
apiVersion: v1
kind: Pod
metadata: {name: old-debian, namespace: images, labels: {scan: "true"}}
spec:
  containers: [{name: c, image: debian:10}]         # EOL, plenty of CVEs
---
apiVersion: v1
kind: Pod
metadata: {name: clean-app, namespace: images, labels: {scan: "true"}}
spec:
  containers: [{name: c, image: nginx:1.27}]        # relatively clean
EOF

echo "[*] Seed complete. Namespaces: prod web dev apps restricted-ns images sysh runtime"
echo "[*] Note: Kyverno / Falco / gVisor get installed inside their own task setup blocks."