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Phase 4 structural (commit 633e440) moved 6 connector files into the
new docs/reference/connectors/ subdirectory but didn't update all
inter-doc references for the new path layout. Phase 11 caught the
high-traffic ones; this sweep gets the rest, found by the Phase 4
follow-on verification pass.
Mappings applied (relative to docs/reference/connectors/):
deployment-atomicity.md → ../deployment-model.md
deployment-vendor-matrix.md → ../vendor-matrix.md
architecture.md → ../architecture.md
est.md → ../protocols/est.md
scep-intune.md → ../protocols/scep-intune.md
async-polling.md → ../protocols/async-ca-polling.md
quickstart.md → ../../getting-started/quickstart.md
demo-advanced.md → ../../getting-started/advanced-demo.md
legacy-est-scep.md → ../protocols/scep-server.md
connectors.md → index.md
Plus prose backtick references (`docs/architecture.md` etc.) updated
to the new subdirectory paths.
Files touched: apache, f5, iis, k8s, nginx, index. 33 line changes.
Full link-check across docs/reference/connectors/*.md is now clean
(0 broken inter-doc references).
123 lines
4.0 KiB
Markdown
123 lines
4.0 KiB
Markdown
# Kubernetes Secrets Connector — Operator Deep-Dive
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> Last reviewed: 2026-05-05
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>
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> Per Phase 14 of the deploy-hardening II master bundle. For the
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> connector-development context (interface contract, registry, atomic
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> deploy primitive shared across all targets), see the
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> [connector index](index.md).
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## Overview
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The K8s connector (`internal/connector/target/k8ssecret/`) deploys
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TLS certs into `kubernetes.io/tls` Secrets. Atomic at the API
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server level (Update is transactional); the post-deploy verify
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SHA-256-compares the returned Secret data against deployed bytes
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(defends against admission webhooks that modify cert data).
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## Vendor versions tested
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- **Kubernetes 1.28 LTS**
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- **Kubernetes 1.30**
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- **Kubernetes 1.31** (current stable)
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## Per-quirk operator guidance
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### Kubelet sync wait contract
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`TestVendorEdge_K8s_KubeletSyncWaitContract_DefaultTimeout60s_E2E`
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After Secret update, kubelet projects new cert bytes into
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pod-mounted volumes. Default sync interval ~60s. The connector
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waits up to `CERTCTL_K8S_DEPLOY_KUBELET_SYNC_TIMEOUT` (default
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60s).
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**Operator action:** for slow clusters (large pod count, slow
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node DNS), tune the env var upward. For fast clusters, the
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default is fine.
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### Admission webhook mutation
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`TestVendorEdge_K8s_AdmissionWebhookModifiesSecretData_DeployDetectsViaSHA256Compare_E2E`
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Some admission webhooks (Vault Agent Injector, OPA Gatekeeper)
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mutate Secret data on Update. The connector pulls the Secret
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back after Update and SHA-256-compares against deployed bytes.
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Mismatch surfaces as deploy failure.
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### Multi-version API stability
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`TestVendorEdge_K8s_K8s128LTS_vs_130_vs_131_SecretAPIContractStable_E2E`
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`kubernetes.io/tls` Secret schema (data.tls.crt + data.tls.key)
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is stable across 1.28-1.31. No per-version branch needed.
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### Typed vs Opaque Secret
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`TestVendorEdge_K8s_TypedKubernetesIOTLSVsUntypedOpaque_DeployRespectsType_E2E`
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Connector preserves operator-supplied Secret type. Typed
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`kubernetes.io/tls` is the canonical form; untyped `Opaque` is
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preserved for operators with legacy automation that expects it.
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### Cert-manager interop
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`TestVendorEdge_K8s_CertManagerInterop_RawSecretVsCertificateCRD_E2E`
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Connector targets raw Secrets, NOT cert-manager `Certificate` CRs.
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Operators using cert-manager should NOT also point certctl at the
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same Secret name (cert-manager will overwrite). Documented
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coexistence: certctl handles non-cert-manager Secrets;
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cert-manager handles its own.
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### Multi-namespace
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`TestVendorEdge_K8s_MultiNamespaceDeploy_DeployUpdatesCorrectNamespace_E2E`
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Connector targets the configured `Namespace` only. Cross-namespace
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deploys require multiple connector entries.
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### RBAC errors
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`TestVendorEdge_K8s_RBACInsufficientPermissions_DeployFailsWithActionableError_E2E`
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Connector surfaces the K8s API's `forbidden: secrets is restricted`
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error verbatim. Operator action: bind a Role with
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`secrets: get,update,create` verbs to the agent's ServiceAccount.
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### Labels + annotations preservation
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`TestVendorEdge_K8s_LabelsAnnotationsPreserved_E2E`
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Connector merges (not replaces) operator-supplied metadata. Custom
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labels/annotations on the Secret survive cert rotation.
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### Pod-mounted Secret rollover
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`TestVendorEdge_K8s_PodMountedSecretRollover_E2E`
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When a pod mounts the Secret as a volume, kubelet projects new
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cert bytes into the pod's filesystem after sync. Pods watching
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the file (via inotify or polling) pick up the new cert without
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restart.
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### Immutable Secret flag
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`TestVendorEdge_K8s_ImmutableSecretFlag_E2E`
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K8s Secrets can be marked `immutable: true` for performance.
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Update fails with actionable error; operator must drop the flag,
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update, then re-apply if desired.
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## V3-Pro deferrals
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- cert-manager `Certificate` CR interop as first-class deploy
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target (V3-Pro: certctl as cert-manager external issuer).
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- Multi-cluster federation (deploy a single cert across N
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clusters with single connector entry).
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## Related docs
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- [Atomic deploy + post-verify + rollback](../deployment-model.md)
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- [Vendor compatibility matrix](../vendor-matrix.md)
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