Hey Steffen, There are couple of ways to do it AFAIK. What we did for our custom UserStorageProvider was to setup a datasource configuration in the existing keycloak datatsources configuration. In the <datasources> section of the standalone.xml you have to add following. We are using an external Postgres DB so my config looks like: <datasource jndi-name="java:jboss/datasources/yourDB" pool-name="yourDB" enabled="true" use-java-context="true"> <connection-url>jdbc:postgresql://<ip_or_host_of_your_external DB>:5432/yourDB</connection-url> <driver>postgresql</driver> <security> <user-name>postgres</user-name> <password>postgres</password> </security> </datasource> Then in the <drivers> section (when it is not already defined) you need to add the driver you use. In my case it is Postgres: <driver name="postgresql" module="org.postgresql.jdbc"> <xa-datasource-class>org.postgresql.xa.PGXADataSource</xa-datasource-class> </driver> In your custom UserStorageProviderFactory ideally in the constructor you can lookup for the datasource: public UserStorageProviderFactory() throws NamingException { InitialContext context = new InitialContext(); dataSource = (DataSource) context.lookup("java:jboss/datasources/yourDB"); try { log.info("datasource: " + dataSource.toString()); log.info("WORKING: " + dataSource.getConnection().isValid(3000)); } catch (SQLException e) { e.printStackTrace(); } } In the create method of your custom factory you can pass the Connection object to your UserStorageProvider: public UserStorageProvider create(KeycloakSession keycloakSession, ComponentModel componentModel) { try { return new UserStorageProvider(keycloakSession, componentModel, dataSource.getConnection()); } catch (SQLException e) { throw new RuntimeException("Could not get a connection for DB"); } } In your provider class you can use this connection to do the lookup for users etc. I hope this helps. Best, Soner