keycloak-server.json
{
    "admin": {
        "realm": "keycloak-admin"
    },
    "audit": {
        "provider": "jpa"
    },
    "model": {
        "provider": "jpa"
    },
    "timer": {
        "provider": "basic"
    },
    "theme": {
        "default": "keycloak",
        "dir": "${jboss.server.config.dir}/themes"
    },
    "login-forms": {
        "provider": "freemarker"
    },
    "account": {
        "provider": "freemarker"
    },
    "email": {
        "provider": "freemarker"
    },
    "scheduled": {
        "interval": 900
    }
}