index.md

[GSP305] Scale Out and Update a Containerized Application on a Kubernetes Cluster

GSP305

---

Time: 1 hour
Difficulty: Intermediate
Price: 5 Credits

Quest: Cloud Architecture: Design, Implement, and Manage

Last updated: May 25, 2023

---

Challenge scenario

You are taking over ownership of a test environment and have been given an updated version of a containerized test application to deploy. Your systems' architecture team has started adopting a containerized microservice architecture. You are responsible for managing the containerized test web applications. You will first deploy the initial version of a test application, called echo-app to a Kubernetes cluster called echo-cluster in a deployment called echo-web.

Before you get started, open the navigation menu and select Cloud Storage. The last steps in the Deployment Manager script used to set up your environment creates a bucket.

Refresh the Storage browser until you see your bucket. You can move on once your Console resembles the following:

Check to make sure your GKE cluster has been created before continuing. Open the navigation menu and select Kubernetes Engine > Clusters.

Continue when you see a green checkmark next to echo-cluster:

To deploy your first version of the application, run the following commands in Cloud Shell to get up and running:

gcloud container clusters get-credentials echo-cluster --zone=us-central1-a

kubectl create deployment echo-web --image=gcr.io/qwiklabs-resources/echo-app:v1

kubectl expose deployment echo-web --type=LoadBalancer --port 80 --target-port 8000

Your challenge

You need to update the running echo-app application in the echo-web deployment from the v1 to the v2 code you have been provided. You must also scale out the application to 2 instances and confirm that they are all running.

1. Check that there is a tagged image in gcr.io for echo-app:v2.

   mkdir echo-web
   cd echo-web
   gsutil cp -r gs://$DEVSHELL_PROJECT_ID/echo-web-v2.tar.gz .
   tar -xzf echo-web-v2.tar.gz
   rm echo-web-v2.tar.gz
   docker build -t echo-app:v2 .
   docker tag echo-app:v2 gcr.io/$DEVSHELL_PROJECT_ID/echo-app:v2
   docker push gcr.io/$DEVSHELL_PROJECT_ID/echo-app:v2

2. Echo-app:v2 is running on the Kubernetes cluster.

   Deploy the first version of the application.

   gcloud container clusters get-credentials echo-cluster --zone=us-central1-a
   kubectl create deployment echo-web --image=gcr.io/qwiklabs-resources/echo-app:v1
   kubectl expose deployment echo-web --type=LoadBalancer --port 80 --target-port 8000

   Edit the deployment.apps file.

   kubectl edit deploy echo-web

   Start the editor by type i. Change image=...:v1 to image=...:v2.

   image=gcr.io/qwiklabs-resources/echo-app:v2

   Save the deployment.apps file, hit ESC then type :wq and Enter.

3. The Kubernetes cluster deployment reports 2 replicas.

   kubectl scale deployment echo-web --replicas=2

4. The application must respond to web requests with V2.0.0.

   kubectl expose deployment echo-web --type=LoadBalancer --port 80 --target-port 8000
   
   kubectl get svc

Congratulations!

<= PREV (GSP304) NEXT (GSP306) =>

HOME