Add the Serval API and controller for the non-cluster host gateway#5067
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The nonclusterhost controller renders the serval gateway when the NonClusterHost resource has spec.typhaEndpoint unset; when it is set, the legacy calico-typha-noncluster-host deployment renders as before. There is no Serval CR, CRD, or controller — NonClusterHost is the sole resource for the feature. Both modes share one host identity (the tigera-noncluster-host ServiceAccount) and one Typha server keypair (typha-certs-noncluster-host, reused by serval's in-process Typha), so switching modes adds no identity or secret and BYO typha certs keep working. A single HostEndpoint-count autoscaler (extracted into a shared typhaautoscaler package) scales both the serval and calico-typha-noncluster-host deployments to the same replica count; only one exists at a time. The fluent-bit log-ingestion input and CSR signing are gated on NonClusterHost presence. Also syncs the felixconfigurations CRDs from calico master. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Description
New feature. Adds the
ServalAPI (operator.tigera.io/v1) and controller. Serval is a layer-7 gateway that becomes the single entrypoint for non-cluster hosts: one HTTPS endpoint serving the impersonating kube-apiserver proxy, the log ingestion routes, and a WebSocket tunnel that carries the felix-typha sync connection. It supersedes the deprecatedNonClusterHostresource;NonClusterHostkeeps working unchanged as a legacy mode until a later removal release.The controller renders the gateway Deployment (combined calico image,
controlPlaneReplicaswith pod anti-affinity,enableServiceLinks: false), a ClusterIP Service, an operator-issued TLS keypair including the external endpoint SAN, RBAC (impersonation, TokenReview/SubjectAccessReview create,geton serviceaccounts for the Tigera-JWT authenticator), and allow-tigera network policies. The fluent-bit input policy admits serval as a source, and the host ClusterRole gains read onservals.Testing: render unit tests, plus end-to-end validation of the rendered object shapes on a kubeadm Enterprise cluster with a Rocky 9 non-cluster host (felix in sync through the tunnel, apiserver proxy serving the cert-init and token-minting flows, logs flowing to linseed).
Companion PR (calico-private): https://github.com/tigera/calico-private/pull/12765
Design: tigera/designs
2026/serval-non-cluster-host-gatewayRelease Note
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