= Docker images for Kubernetes Application Upgrade

== Docker Container

. Build Docker images:

  docker image build -t arungupta/app-upgrade:v1 app-v1
  docker image build -t arungupta/app-upgrade:v2 app-v2

. Run Docker container:

  docker container run -d -p 8080:8080 arungupta/app-upgrade:v1
  docker container run -d -p 8081:8080 arungupta/app-upgrade:v2

. Access v1 application:

  curl http://localhost:8080
  Hello World!

. Access v2 application:

  $ curl http://localhost:8081
  Howdy World!

== Kubernetes

. Run pod:

  kubectl run app-v1 --image=arungupta/app-upgrade:v1
  kubectl run app-v2 --image=arungupta/app-upgrade:v2

. Publish service:

  kubectl expose deployment/app-v1 --target-port=8080 --port=8080 --name=app-v1
  kubectl expose deployment/app-v2 --target-port=8080 --port=8081 --name=app-v2

. Access v1 application (on minikube):

  curl http://localhost:8080
  Hello World!
+
For a Kubernetes cluster running on AWS, you need to run proxy and access the application using http://localhost:8001/api/v1/proxy/namespaces/default/services/app-v1/.
+
. Access v2 application:

  curl http://localhost:8081
  Howdy World!