How to Fire a Script On User Login

Getting advice
1

I want Keycloak to fire a script - say startup a docker container - when a user logs in. What is the easiest way to achieve this?

2

You can implement an event listener, listening to the LOGIN event which does anything, e.g. sending a message to another system, where the container can be started…

3

It seems like the only way to do that is custom Java code then?

4

Using what is built in to Keycloak, yes.

There is an extension we built that allows loading of JS scripts at runtime that can be run as event listener GitHub - p2-inc/keycloak-events: Useful Keycloak event listener implementations and utilities.