# T02 — K8s Foundations

Phase 1 of NK-WP-0001: namespaces, NetworkPolicies, cert-manager, StorageClass.

## Prerequisites

- K3s cluster running (ThreePhoenix HA or single-node dev)
- T01 Phase 0a complete (KeePassXC vault populated, ops bundle exported)
- `kubectl` configured with cluster access

## Apply order

```bash
# 1. Install cert-manager (if not already on cluster)
helm repo add jetstack https://charts.jetstack.io
helm repo update
helm install cert-manager jetstack/cert-manager \
  --namespace cert-manager --create-namespace \
  --set crds.enabled=true

# Wait for cert-manager to be ready
kubectl rollout status deployment/cert-manager -n cert-manager

# 2. Create namespaces
kubectl apply -f namespaces/namespaces.yaml

# 3. Apply NetworkPolicies
kubectl apply -f network-policies/netpol-sso.yaml
kubectl apply -f network-policies/netpol-mfa.yaml
kubectl apply -f network-policies/netpol-databases.yaml

# 4. Create ClusterIssuers
#    Edit issuers.yaml first: replace ACME_EMAIL with your address
kubectl apply -f cert-manager/issuers.yaml

# 5. Verify cert-manager with test certificate
kubectl apply -f cert-manager/test-certificate.yaml
kubectl wait --for=condition=Ready certificate/selfsigned-test \
  -n cert-manager-test --timeout=60s
kubectl delete namespace cert-manager-test

# 6. Verify StorageClass
kubectl apply -f storage/verify-pvc.yaml
kubectl wait --for=condition=Ready pod/storage-test \
  -n storage-test --timeout=60s
kubectl logs -n storage-test storage-test
kubectl delete namespace storage-test

# 7. Run the full verification script
chmod +x verify-t02.sh
./verify-t02.sh
```

## NetworkPolicy design

All three namespaces follow a default-deny-all posture. Only the minimal
required paths are opened:

| Source | Destination | Port | Purpose |
|--------|-------------|------|---------|
| Traefik (kube-system) | Keycloak (sso) | 8080 | OIDC/SAML ingress |
| Traefik (kube-system) | privacyIDEA (mfa) | 8080 | MFA portal ingress |
| Keycloak (sso) | privacyIDEA (mfa) | 8080 | Provider API calls |
| Keycloak (sso) | PostgreSQL (databases) | 5432 | DB |
| privacyIDEA (mfa) | PostgreSQL (databases) | 5432 | DB |
| CNPG operator (cnpg-system) | PostgreSQL (databases) | 5432/9187 | Operator + metrics |
| All pods | kube-dns (kube-system) | 53 | DNS resolution |
| CNPG pods | K8s API | 6443 | Status updates |

## Verifying denied paths (manual)

After applying NetworkPolicies, confirm that illegal paths are blocked:

```bash
# Test: Keycloak → databases direct (should be ALLOWED)
kubectl run test-allowed -n sso --rm -it --image=busybox --restart=Never \
  -- nc -zv net-kingdom-pg-rw.databases.svc.cluster.local 5432

# Test: mfa → sso (should be DENIED — privacyIDEA must not reach Keycloak directly)
kubectl run test-denied -n mfa --rm -it --image=busybox --restart=Never \
  -- nc -zv -w3 keycloak.sso.svc.cluster.local 8080

# Test: databases → sso (should be DENIED — DB pods must not initiate connections)
kubectl run test-denied2 -n databases --rm -it --image=busybox --restart=Never \
  -- nc -zw3 keycloak.sso.svc.cluster.local 8080
```

## Notes

- `net-kingdom/component` labels on namespaces are used by NetworkPolicy
  `namespaceSelector` rules. Do not remove them.
- `cnpg.io/cluster: net-kingdom-pg` in `netpol-databases.yaml` must match
  the name of the CloudNativePG `Cluster` CR you create in T03.
- The `letsencrypt-prod` ClusterIssuer requires public DNS and port 80 open
  to Let's Encrypt servers. Update `ACME_EMAIL` before applying.