After taking a detour to get our feet wet on dynamically configuring applications using ConfigMap, we will return to our regularly-scheduled program by deploying the rest of the guestbook application. You will see the concepts of Deployment, Replica Sets, and Pods repeated again for the backends and frontends. We will introduce another key concept called Service. You might have also noticed the power of protocols and Docker images. Even though we switched to a different image for redis-master, we have an expectation that the rest of the implementation should go through without any hitches.
Fully deploying of the sample guestbook application
Exposing the Redis master service
With plain Docker, the exposed port is constrained...