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Troubleshooting

Common failures, what causes them, and how to fix them.

The login page looks like default Keycloak (not branded)

The schuly theme jar isn't loaded, or the realm isn't using it.

  • Confirm the realm's loginTheme is schuly (realms/schuly-realm.json).
  • If you changed theme code, rebuild the image - the theme is baked in at build time, not loaded at runtime: docker compose -f compose.dev.yml up --build. See Theme development.

Infinite redirects, "HTTPS required", or wrong URLs in the browser

Keycloak doesn't know its public URL or isn't trusting the proxy headers.

  • Set KC_HOSTNAME to the full public URL (e.g. https://auth.schuly.dev).
  • Behind a TLS-terminating proxy, set KC_PROXY_HEADERS=xforwarded and KC_HTTP_ENABLED=true, and make sure the proxy forwards X-Forwarded-* headers.
  • See Self-hosting the full stack.

Realm edits to the JSON don't show up

The realm is imported only on the first start; afterwards an existing realm is left as-is.

  • Local dev: reset the data volume to re-import - docker compose -f compose.dev.yml down -v && docker compose -f compose.dev.yml up --build.
  • Production: the realm already exists in Postgres; apply changes in the admin console and snapshot them back with the export script (see Realm management). Don't expect the bundled JSON to overwrite a live realm.

Health check fails / can't reach /health

Health and metrics are on the management port 9000, not 8080.

  • Hit http://<host>:9000/health/ready from inside the network (it's intentionally not proxied to the internet).

The bootstrap admin can't log in

KC_BOOTSTRAP_ADMIN_USERNAME / KC_BOOTSTRAP_ADMIN_PASSWORD only create an account on the first start of a fresh database. If the database already had an admin, those variables do nothing - use the existing admin, or reset via the admin REST API.

Database connection errors on startup

  • Verify KC_DB_URL, KC_DB_USERNAME, KC_DB_PASSWORD and that Postgres is reachable and accepting connections (wait for its healthcheck before Keycloak starts).
  • The image is built for Postgres only - don't override KC_DB.

New users aren't prompted for 2FA / passkey questions

2FA enrollment behavior is defined by the browser-2fa flow and required actions - see the 2FA section in Realm management, including the migration note for pre-existing users.