I have a group of EC2 instances that will update their configurations based on changes made to specific parameters in Parameter Store. Whenever an instance is deployed, a startup script will read parameter values to know whether to enable or disable certain functionality. These instances get deployed on a periodic basis, so reacting to parameter store changes happen fairly often.
I would like to control the configurations of Lambda Functions (mainly environment variables and Layers) in a similar way - reacting to changes from Parameter Store. However, these Lambda Functions are not deployed in a standard way, so no startup script is included at the moment. These Lambda Functions will not be periodically deployed either.
I would like a suggestion for an appropriate way to implement this functionality. My first thought would be to create an Eventbridge Lambda Function that reacts to specific events in parameter store, though I don't have too much experience with Eventbridge, so I'm not too sure if this is possible.
Alternatively, if there is a better approach to controlling Lambda Functions configurations, that would be nice to know as well.