In this section, we'll revisit our ticketing service: a kiosk web service as frontend, providing interface for get/put tickets. There is a Redis acting as cache, to manage how many tickets we have. Redis also acts as a publisher/subscriber channel. Once a ticket is sold, kiosk will publish an event into it. Subscriber is called recorder, which will write a timestamp and record it to the MySQL database. Please refer to the last section in Chapter 2, DevOps with Container for the detailed Dockerfile and Docker compose implementation. We'll use Deployment, Service, Secret, Volume, and ConfigMap objects to implement this example in Kubernetes. Source code can be found at https://github.com/DevOps-with-Kubernetes/examples/tree/master/chapter3/3-3_kiosk.
We'll need four kinds of pods. Deployment is...
