I'm completely new to Kubernetes, I'm a bit lost of were to search. I would like to have blue-green deployment between with a web application solution. I've been told that the blue pods are destroyed when there is no user session anymore associated to the blue pods. Is this right? In some web pages I'm reading that there is a flip between one and the other. Is it mandatory to use the session? In my case I've got a stateless application
Blue Green Deployment
Blue Green deployment is not a standard feature in Kubernetes. That means that there are many different 3rd party products for this, or patterns. And all products and pattern differ in how they do this.
Example: Zero-downtime Deployment in Kubernetes with Jenkins is using two Deployment with different labels and update the Service to point to the other service for switching. It is not the easiest strategy to get right.
Stateless
In my case I've got a stateless application
This is great! With a stateless app, is is much easier to get the deployment strategy as you want.
Default Deployment Strategy
The default deployment strategy for Deployment (stateless workload) is Rolling Deployment and if that fits your needs, it is the easiest deployment strategy to use.