images

Docker images for Kubernetes Application Upgrade

Docker Container

1. Build Docker images:

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

2. 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

3. Access v1 application:

   curl http://localhost:8080
   Hello World!

4. Access v2 application:

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

Kubernetes

1. Run pod:

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

2. 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

3. 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/.

4. Access v2 application:

   curl http://localhost:8081
   Howdy World!