Kubernetes Operator

Tool availability: some MCP tools named here live in the full toolset profile — if one is not advertised on this connection, tell the user to reconnect the MCP server with ?toolsets=full (or use the cpln CLI fallback). Reads and deletes work on every profile via the generic list_resources / get_resource / delete_resource tools.

The operator (Helm chart cpln-operator) runs in any Kubernetes cluster and reconciles cpln.io/v1 custom resources, plus labeled native Secrets, against the platform on a 30-second loop. Reach for it only when resources must live in Git and be reconciled from a cluster (ArgoCD/Flux); for direct provisioning prefer the typed MCP tools, and for pipeline-driven YAML prefer cpln apply (gitops-cicd skill). The recurring failure is manifest shape: org, gvc, and description sit at the top level next to `spec`, not inside it — author the spec block with mcp__cpln__get_resource_schema, or skip hand-writing entirely by exporting with -o crd.

Install

cert-manager is a hard requirement (the chart ships a self-signed Issuer whose certificate backs the operator's mutating webhook), then the chart, then per-org auth:

kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.16.3/cert-manager.yaml
kubectl wait --for=condition=Available deployment --all -n cert-manager --timeout=300s

helm repo add cpln https://controlplane-com.github.io/k8s-operator
helm install cpln-operator cpln/cpln-operator -n controlplane --create-namespace
kubectl get pods -n controlplane -l app=operator

cpln operator install --serviceaccount k8s-operator --org ORG

cpln operator install configures auth only (the Helm step deploys the operator): it gets-or-creates the service account, adds it to a group (--serviceaccount-group, default superusers — any other group prints a warning), mints a new key, and applies a Secret named after the org in the controlplane namespace. Re-running with the same --serviceaccount is a no-op; a different name replaces the secret with a fresh key; an org-named secret the operator does not own aborts the install. --export prints the Secret YAML for Git instead of applying it — but still creates the service account and key on the platform.

Manual equivalent (one secret per org; multiple orgs = multiple secrets):

apiVersion: v1
kind: Secret
metadata:
  name: ORG                    # must equal the org name
  namespace: controlplane
  labels:
    app.kubernetes.io/managed-by: cpln-operator   # required — the operator only sees labeled Secrets
data:
  token: BASE64_KEY            # echo -n "KEY" | base64; the CLI also stamps a cpln/serviceaccount annotation it uses to detect reuse

Tokens are cached in memory per org and never re-read — after rotating a key, kubectl rollout restart deployment/operator -n controlplane. Helm values of note: env.MANAGE_KINDS (comma list restricting which kinds get controllers), env.RECONCILE_INTERVAL_SECONDS (default 30), env.CPLN_API_URL.

CRD shape

apiVersion: cpln.io/v1
kind: workload            # kind names are lowercase
metadata:
  name: my-app            # cluster name; annotation cpln.io/name-replacement overrides the platform name
  namespace: default
  annotations:
    cpln.io/resource-policy: keep   # optional: deleting this CR then leaves the platform resource intact
org: ORG                  # required on every CR — there is no default org
gvc: GVC                  # required for gvc-scoped kinds: workload, identity, volumeset
description: my app       # top level, like tags
spec:                     # exact platform spec
  type: serverless
  containers:
    - name: main
      image: nginx:latest
      port: 80

Org-scoped kinds: agent, auditctx, cloudaccount, domain, group, gvc, ipset, location, org, policy, serviceaccount. GVC-scoped: workload, identity, volumeset. Secrets are native v1 Secrets, not CRDs (a cpln.io/v1 secret CRD exists but is operator-internal — it holds sync status for native Secrets; never author it). An mk8scluster CRD ships but the platform API has no matching endpoint, so mk8s clusters cannot be operator-managed. Recommended layout: one namespace per GVC for gvc-scoped kinds, one per org for org-scoped kinds.

Secrets (native v1 Secrets)

apiVersion: v1
kind: Secret
type: opaque               # the platform secret type, lowercase: opaque, aws, azure-connector, azure-sdk, dictionary, docker, ecr, gcp, keypair, nats-account, tls, userpass
metadata:
  name: my-secret
  namespace: default       # any namespace EXCEPT controlplane (everything there is skipped as operator config)
  labels:
    app.kubernetes.io/managed-by: cpln-operator   # required — unlabeled Secrets are invisible to the operator
  annotations:
    cpln.io/org: ORG       # required — selects the org and its auth secret
data:                      # keys mirror the platform secret's data object
  payload: c2VjcmV0LXZhbHVl
  encoding: cGxhaW4=       # opaque only: plain | base64

For azure-sdk, docker, and gcp the platform payload is a single string — put it under one value key. Platform tags ride as cpln.io/-prefixed annotations. Each synced Secret gets a companion secrets.cpln.io CR (same name) carrying sync status and cpln.io/sync-health-status / cpln.io/sync-health-message annotations — check it when a Secret will not sync.

How sync behaves

• A mutating webhook stamps every CR (and labeled Secret) with the cpln.io/sync-protection finalizer; namespaces labeled skip-webhook: "true" are exempt.
• Local edit (metadata.generation changed): the operator PUTs the CR to the platform — local state wins.
• No local edit: every cycle it pulls platform state into the CR, so console edits appear as CR changes. Under ArgoCD selfHeal that registers as drift, Argo restores the Git version, and the operator pushes it back — Git wins over console edits.
• Deleted on the platform: the CR is deleted from the cluster (with selfHeal, Argo re-applies it and the operator re-creates the platform resource).
• CR deleted: the platform resource is deleted too, unless annotated cpln.io/resource-policy: keep. Deletes blocked by dependent resources retry each cycle — delete children first.
• Failures land in status.operator.validationError with the platform error, and retry with exponential backoff (capped at 30s). status.phase is Ready, Pending, Unhealthy, or Suspended; the platform's own status fields (endpoints, health) are merged into the CR status.
• Workloads additionally stream live deployment state over WebSocket into read-only child CRs: kubectl get deployments.cpln.io (named LOCATION.WORKLOAD), plus deploymentversions, containerstatuses, and jobexecutionstatuses for cron; volumesets get volumesetstatuslocations and persistentvolumestatuses. Children are owner-referenced and garbage-collected with the parent.

Exporting existing resources

CRD export is CLI/console-only — no MCP tool emits CRD YAML. Discover and inspect with mcp__cpln__list_resources / mcp__cpln__get_resource, then:

cpln workload get my-app --gvc GVC --org ORG -o crd > workload.yaml
cpln gvc get -o crd --org ORG > all-gvcs.yaml        # no name = whole collection, --- separated

In the console, every resource has Export, and the create flow has Preview, with a "K8s CRD" option. System fields are stripped and tags become annotations. Secret export embeds the revealed payload (base64-encoded, not encrypted) and needs the reveal permission — treat the output as sensitive.

ArgoCD

Works without special configuration: point an Application at a Git path of CRD manifests (or a Helm chart templating them). The chart patches the ArgoCD ConfigMap with per-kind health checks — CR status.phase and validationError surface as Argo health — when the argocd namespace exists at install time; if Argo came later, run helm upgrade cpln-operator cpln/cpln-operator.

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata: { name: cpln-resources, namespace: argocd }
spec:
  project: default
  destination: { server: https://kubernetes.default.svc, namespace: NAMESPACE }
  source: { repoURL: "https://github.com/ORG/REPO.git", path: cpln-crds, targetRevision: main }
  syncPolicy:
    automated:
      prune: true      # manifest removed from Git = platform resource deleted (honor resource-policy keep)
      selfHeal: true   # console edits revert to Git

Uninstall

cpln operator uninstall --org ORG removes only the auth secret. Before helm uninstall cpln-operator -n controlplane, decide the fate of synced resources: annotate CRs cpln.io/resource-policy: keep (or delete the CRs you want gone first) — once the operator is gone nothing clears the cpln.io/sync-protection finalizer, so leftover CRs stick in Terminating until you strip it (kubectl patch ... -p '{"metadata":{"finalizers":null}}'). Platform resources whose CRs were never deleted survive uninstall.

Verify

• kubectl get workloads -o yaml — status.phase: Ready and no status.operator.validationError.
• cpln workload get my-app --gvc GVC --org ORG — the platform side exists and matches.
• kubectl logs -n controlplane -l app=operator -f — watch a sync round-trip.

Troubleshooting

Quick reference

Related skills

• gitops-cicd — pipelines with CPLN_TOKEN + cpln apply; choose it over the operator when no cluster-side reconciler is wanted.
• iac-terraform-pulumi — the Terraform/Pulumi alternative for declarative management.
• mk8s-byok — provisioning a Kubernetes cluster to host the operator (and managing mk8s itself).
• workload — the primary skill for what goes inside a workload spec.

Documentation

• Kubernetes Operator Reference
• Operator Install Guide
• Operator source and issues