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1. Contain the appliance and establish a trusted path
Use your incident-response process to isolate or disable the appliance. Do not use it to administer the affected clusters while its integrity is in doubt. From a trusted host, with a trusted administrator account and communication channel, establish access to each cluster through its supported management path.
Preserve available appliance and Kubernetes audit evidence before routine cleanup or recovery changes remove it. Kubernetes’ Securing a Cluster guidance recommends enabling audit logging and archiving audit files on a secure server. If audit logging was not enabled or records are incomplete, do not treat the absence of an event as proof that access did not occur.
2. Find out what the appliance could reach
Build an inventory from the appliance’s configuration, file stores, logs, permissions, backup locations, and the cluster-side access granted to its identities. Distinguish credentials it stored from credentials it could read or obtain through its administrative privileges. Scope every cluster the appliance managed, not just the one where suspicious activity first appeared.
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- Cluster administration: kubeconfigs and client certificates used by appliance operators or automation.
- Control-plane and data-store access: API server and etcd client credentials, along with any access to etcd itself.
- Trust and signing material: cluster CA private keys and service-account signing keys. Exposure of these keys has different consequences from exposure of a single issued credential.
- Bootstrap and workload identity: bootstrap tokens, service-account tokens used by external integrations, and credentials stored in workload configuration.
- Connected systems: identity-provider credentials, cloud credentials, and tokens or keys for integrations managed through the appliance.
- Recovery copies: appliance backups, cluster backups, and etcd snapshots that might contain any of the above.
Kubernetes’ PKI certificates and requirements documentation maps the server and client certificate roles; use it to identify what each discovered certificate is for rather than treating every certificate as interchangeable. Treat direct etcd access as especially consequential: Kubernetes’ API Server Bypass Risks documentation says it can disclose or modify etcd data without Kubernetes admission control or audit logging. The Securing a Cluster documentation states: “Write access to the etcd backend for the API is equivalent to gaining root on the entire cluster.”
3. Choose the response by credential type
Prioritize confirmed exposure and the cluster’s actual authentication design. Record for each credential who issued it, what it can access, where it is used, how it can be disabled or replaced, and how you will verify that clients have moved to the replacement.
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| Credential or key | Response consideration |
|---|---|
| External identity-provider or integration credential | Disable or replace it using the issuer’s or integration’s supported process. Update dependent clients and verify they authenticate with the replacement. |
| Bootstrap token | Revoke or remove its authorization if it remains active and is exposed. Kubernetes recommends revoking bootstrap tokens after setup. |
| Service-account token used outside the cluster | Rotate tokens used by external integrations and update those integrations. Kubernetes recommends short credential lifetimes and frequent rotation in these cases; use bound service-account tokens where applicable. |
| Issued Kubernetes client certificate | Plan replacement with the issuing CA and identify every client that must receive the new certificate. In Kubernetes’ built-in X.509 client-certificate model, an individual certificate cannot be individually revoked. |
| CA private key or service-account signing key | Treat as a trust or signing-key incident, not routine leaf-certificate renewal. A replacement must account for the systems and identities that trust or use the key. |
| etcd credentials or direct etcd access | Assess potential disclosure or modification of cluster data and the integrity of recovery copies. Restore or rebuild only from material whose trustworthiness has been established. |
4. Use the workflow for your cluster distribution
The relevant procedure depends on who manages the cluster lifecycle and signing keys, whether the exposure is an issued credential or a trust root, which clients need new credentials, and what availability impact a change may have. Do not choose a procedure just because it has “rotate” in its name.
| Environment | What the documented workflow establishes | Operational implication |
|---|---|---|
| kubeadm | kubeadm certs renew renews supported certificates using existing CA material; kubeadm certs renew all requests renewal of all of them. kubeadm does not support CA rotation or replacement out of the box. |
In a replicated control plane, run renewal on all control-plane nodes. Restart affected control-plane static Pods because dynamic reload is not supported for all components. Renewal does not invalidate the existing CA or resolve exposure of its private key. |
| kOps | kOps documents a separate procedure for rotating CA and service-account keysets. | Follow the procedure for the deployed kOps environment; do not substitute kubeadm steps. |
| Google Kubernetes Engine (GKE) with customer-managed control-plane CAs and keys | Google documents a provider-specific rotation procedure and recommends validating the process before an incident. | Use the applicable GKE workflow and account for its provider-managed behavior rather than assuming self-managed control-plane operations apply. |
For kubeadm clusters, certificate renewal is appropriate only when the CA material is trusted and the incident calls for renewing supported certificates. If CA material may be compromised, renewal under that same CA does not establish a new trust root. Re-keying a CA can affect availability and requires a tested plan for replacing trust and credentials across the cluster’s clients and components. The Kubernetes documentation does not provide a universal CA-rotation command sequence for kubeadm.
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5. Validate the change and protect recovery material
Before closing the response, verify the outcome from a trusted administrative path. Check that expected administrators, control-plane components, workloads, and integrations can authenticate; where an issuer supports revocation, confirm that obsolete credentials no longer work. Review audit and other available logs for unexpected access after the change, and preserve relevant records securely.
Assess whether snapshots or backups could reintroduce exposed credentials or untrusted state. Kubernetes recommends protecting backups, encrypting them, and using encryption at rest for API data. Confirm recovery material is trusted before restoring it; an unverified backup can bring the compromised credentials back into service.
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