Files
zitadel/apps
Max PeintnerandGitHub ceba26f434 fix(login): verify API credentials at startup instead of in readiness probe (#12742)
# Which Problems Are Solved

The Login V2 readiness endpoint `/ui/v2/login/ready` performs an
authenticated `SettingsService.GetGeneralSettings` call on every
invocation.

This only affects self-hosted Login V2 deployments that probe the
endpoint periodically, for example via the Helm chart's readiness and
startup probes, the Docker `HEALTHCHECK`, or a custom HTTP probe. In
those setups every login replica continuously issues authenticated API
calls that pass through the access-log interceptor and are treated as
regular authenticated requests of the instance, although they are only
probe traffic. The login hosted by ZITADEL Cloud is not affected, and
neither are self-hosted deployments that do not probe `/ready`.

Independent of the counting, validating credentials on every probe is
unusual: readiness probes are meant to report whether a replica can
serve traffic, while configuration errors such as invalid credentials
are better caught once at startup.

# How the Problems Are Solved

The readiness endpoint now only checks that the ZITADEL API is reachable
and ready, using the API's unauthenticated `/debug/ready` endpoint. That
endpoint is served outside the access-log and quota interceptors, so
probe traffic is no longer recorded. `CUSTOM_REQUEST_HEADERS` are
applied to the readiness request as they are to gRPC requests.

The credential check moves to process startup: `register()` in
`instrumentation.ts` calls the new `verifyApiCredentials()` once, using
the same auth and transport path as real requests. If the API rejects
the credentials (`Unauthenticated`/`PermissionDenied`) or no credentials
are configured, the process exits with a clear error so misconfiguration
is visible immediately. If the API is not reachable at startup, a
warning is logged and the process continues; reachability remains the
job of the readiness probe and `ZITADEL_API_AWAITINITIALCONN`. Unit
tests cover the readiness route, the credential check result mapping,
and the startup behavior of `register()`.

No changes to the Helm chart or Dockerfile are required. Self-hosted
deployments pick up the fix with the next login image; until then, the
probe interval can be increased to reduce the number of calls.
2026-09-15 11:27:35 +00:00
..