Hands-On Microservices with Kubernetes

Invoking serverless functions

Once a serverless function is deployed in the cluster, it will be dormant. There will be a controller that runs constantly ready to invoke or trigger functions. The controller should take very few resources and just listen for incoming requests or events to trigger functions. In Kubernetes, if you need to invoke functions from outside the cluster, there will probably be some additional ingress configuration. However, the most common use case is to invoke functions internally and expose a fully-fledged service to the world.

Now that we understand what serverless functions are all about, let's add some serverless function capabilities to Delinkcious.