A minimal keycloak-server.properties just enough to have Keycloak.X running

keycloak-server.properties

admin.realm = master

hostname.provider = request
hostname.fixed.hostname = localhost
hostname.fixed.httpPort= -1
hostname.fixed.httpsPort= -1

eventsListener.jboss-logging.success-level=debug
eventsListener.jboss-logging.error-level=warn

connectionsJpa.default.url=jdbc:postgresql:keycloak
connectionsJpa.default.driver=org.postgresql.Driver
connectionsJpa.default.user=keycloak
connectionsJpa.default.password=keycloak

eventsStore.provider=jpa
realm.provider=jpa
user.provider=jpa
userFederatedStorage.provider=jpa
userSessionPersister.provider=jpa
authorizationPersister.provider=jpa
                                 
userCache.enabled=true
                                 
timer.provider=basic

theme.staticMaxAge=2592000
theme.cacheTemplates=true
theme.cacheThemes=true

scheduled.interval=900