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Aleksei Sviridkin
df85632c89
The vendored chart defaults webhook.securePort to 10250, which is the port the kubelet serves on. Upstream picks that value deliberately, for GKE private clusters where apiservers may reach nodes only on 443 and 10250; it is free of consequence there and unsafe here. When a connection to the webhook Service resolves to a node IP instead of a Pod IP, it reaches the kubelet, which completes the TLS handshake with its node serving certificate. The apiserver then rejects every cert-manager admission call in the cluster with x509: certificate is valid for <node>, not cert-manager-webhook.cozy-cert-manager.svc and, because the webhook is failurePolicy: Fail, that stalls platform bootstrap. The certificate is valid; it is simply the wrong server's. The error names cert-manager and points away from the routing layer that actually failed, which makes a rare misroute expensive to diagnose. Serve on 10260 instead, the port upstream's troubleshooting guide prescribes for this exact error. It documents the failure on EKS Fargate, where a microVM forwards every port to the pod except the one its own kubelet already holds; the cause there is understood and ours is not, but the shape is the same, down to the certificate that comes back naming the node. What the fix needs of the port is that nothing answers on it in a node's network namespace, and nothing in the platform does. The same misroute is then refused at connect time, which is an honest and immediately diagnosable error. This does not prevent the misroute, whose cause is unestablished; it removes the collision that turns one into a cluster-wide failure attributed to the wrong component. The Service targets the container port by name, so it follows the change without an edit, and a rolling update resolves the old and new ports per Pod rather than dropping the endpoint. Tests pin the listener flag together with the advertised containerPort so the two cannot drift apart. Assisted-By: Claude <noreply@anthropic.com> Signed-off-by: Aleksei Sviridkin <f@lex.la>