96 lines
3.4 KiB
Markdown
96 lines
3.4 KiB
Markdown
|
# 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.
|