certctl/deploy/helm/certctl/README.md

certctl Helm Chart

Production-ready Helm chart for deploying certctl on Kubernetes. Wires up the certctl server (Deployment), PostgreSQL (StatefulSet with PVC), and the agent (DaemonSet — one per node) on a private cluster, with health probes, security contexts, and optional Ingress.

Quick install

helm install certctl deploy/helm/certctl/ \
  --create-namespace --namespace certctl \
  --set server.auth.apiKey="$(openssl rand -base64 32)" \
  --set postgresql.auth.password="$(openssl rand -base64 24)"

This brings up:

• <release>-server Deployment (HTTPS-only on port 8443; TLS 1.3)
• <release>-postgres StatefulSet (PostgreSQL 16-alpine, 1 replica, 10Gi PVC by default)
• <release>-agent DaemonSet (polls server, generates ECDSA P-256 keys locally)
• Service objects, optional Ingress, and ServiceAccount with RBAC

See values.yaml for the full configuration surface — issuer settings, target connectors, scheduler intervals, notifier credentials, and resource requests/limits all live there.

Operational notes

Postgres password rotation — read this before changing postgresql.auth.password

The trap. postgresql.auth.password is bound to pg_authid exactly once — when the StatefulSet's PVC is provisioned and initdb runs. The official postgres:16-alpine image only runs initdb when /var/lib/postgresql/data is empty, so on every subsequent rollout the POSTGRES_PASSWORD env var is read into the container but ignored by postgres itself. The certctl-server container also picks up the new value (via the database URL helper template), so the two halves diverge: server presents the new password, postgres still expects the old one.

Symptom. The certctl-server pod's startup log shows:

failed to ping database: postgres rejected the configured credentials
(SQLSTATE 28P01 — invalid_password). If you recently rotated POSTGRES_PASSWORD ...

That diagnostic is emitted by internal/repository/postgres/db.go::wrapPingError — it points operators at the two remediation paths below.

Remediation, non-destructive (preferred for any environment with real data):

# 1. Rotate the password in postgres directly
kubectl -n certctl exec -it <release>-postgres-0 -- \
  psql -U certctl -c "ALTER ROLE certctl PASSWORD '<new-password>';"

# 2. Update the secret / Helm values to the same value
helm upgrade <release> deploy/helm/certctl/ \
  --reuse-values \
  --set postgresql.auth.password='<new-password>'

# 3. Bounce the certctl-server pod so it re-reads the secret
kubectl -n certctl rollout restart deployment/<release>-server

Remediation, destructive (DESTROYS ALL CERTCTL DATA — only acceptable on dev/demo clusters):

helm uninstall <release> -n certctl
kubectl -n certctl delete pvc -l \
  app.kubernetes.io/name=certctl,app.kubernetes.io/component=postgres
helm install <release> deploy/helm/certctl/ \
  --namespace certctl \
  --set postgresql.auth.password='<new-password>'

The PVC re-creates empty, initdb runs on first boot of the new postgres pod, and pg_authid is seeded with the new password.

Why we don't fix this in the chart. The env-vs-pg_authid divergence is intrinsic to how the upstream postgres image bootstraps — initdb is run-once-per-empty-data-dir, and there is no upstream-supported way to make subsequent boots re-seed pg_authid from POSTGRES_PASSWORD. The ergonomic answer is the runtime diagnostic plus this operational note.

Cross-references. Same root cause is documented for the docker-compose path in docs/quickstart.md (Warning callout after the cp .env.example .env block) and in deploy/ENVIRONMENTS.md (Stateful volume — first-boot password binding section). The runtime diagnostic itself lives in internal/repository/postgres/db.go::wrapPingError with regression coverage in internal/repository/postgres/db_test.go.

Server API key rotation

Unlike the postgres password, server.auth.apiKey accepts a comma-separated list, so zero-downtime rotation is straightforward:

# 1. Add the new key alongside the old
helm upgrade <release> deploy/helm/certctl/ \
  --reuse-values \
  --set server.auth.apiKey='new-key,old-key'

# 2. Roll your agents / clients over to the new key

# 3. Remove the old key
helm upgrade <release> deploy/helm/certctl/ \
  --reuse-values \
  --set server.auth.apiKey='new-key'

TLS certificate sourcing

By default the chart provisions a self-signed cert via the same init-container pattern as the docker-compose deploy. For production, supply an operator-managed Secret (cert-manager, internal CA, etc.) — see docs/tls.md for the full provisioning matrix and docs/upgrade-to-tls.md for upgrade-from-HTTP procedures.

Disabling embedded postgres

If you have an existing PostgreSQL cluster, disable the embedded one and point at it directly:

helm install certctl deploy/helm/certctl/ \
  --set postgresql.enabled=false \
  --set server.databaseUrl='postgres://certctl:<pw>@my-pg-host:5432/certctl?sslmode=require'

The volume-trap section above does not apply to this configuration — your postgres operator (or cloud DB) handles password rotation, and you control pg_authid directly.

Uninstall

helm uninstall <release> -n certctl
# Optional — also delete the postgres PVC (DESTROYS DATA):
kubectl -n certctl delete pvc -l \
  app.kubernetes.io/name=certctl,app.kubernetes.io/component=postgres

By default helm uninstall retains the StatefulSet's PVCs, so reinstalling with the same release name preserves the database. If you've changed postgresql.auth.password in your values between uninstall and reinstall, you'll hit the trap on the reinstall — apply the non-destructive remediation above, or also delete the PVC.