Scaling the Web Frontend and Cleanup

1. Copy the external IP address, and load the page in your browser to view your guestbook. {{< note >}} Try adding some guestbook entries by typing in a message, and clicking Submit. The message you typed appears in the frontend. This message indicates that data is successfully added to Redis through the Services you created earlier. {{< /note >}} ## Scale the Web Frontend You can scale up or down as needed because your servers are defined as a Service that uses a Deployment controller. 1. Run the following command to scale up the number of frontend Pods: ```shell kubectl scale deployment frontend --replicas=5 ``` 1. Query the list of Pods to verify the number of frontend Pods running: ```shell kubectl get pods ``` The response should look similar to this: ``` NAME READY STATUS RESTARTS AGE frontend-85595f5bf9-5df5m 1/1 Running 0 83s frontend-85595f5bf9-7zmg5 1/1 Running 0 83s frontend-85595f5bf9-cpskg 1/1 Running 0 15m frontend-85595f5bf9-l2l54 1/1 Running 0 14m frontend-85595f5bf9-l9c8z 1/1 Running 0 14m redis-follower-dddfbdcc9-82sfr 1/1 Running 0 97m redis-follower-dddfbdcc9-qrt5k 1/1 Running 0 97m redis-leader-fb76b4755-xjr2n 1/1 Running 0 108m ``` 1. Run the following command to scale down the number of frontend Pods: ```shell kubectl scale deployment frontend --replicas=2 ``` 1. Query the list of Pods to verify the number of frontend Pods running: ```shell kubectl get pods ``` The response should look similar to this: ``` NAME READY STATUS RESTARTS AGE frontend-85595f5bf9-cpskg 1/1 Running 0 16m frontend-85595f5bf9-l9c8z 1/1 Running 0 15m redis-follower-dddfbdcc9-82sfr 1/1 Running 0 98m redis-follower-dddfbdcc9-qrt5k 1/1 Running 0 98m redis-leader-fb76b4755-xjr2n 1/1 Running 0 109m ``` ## {{% heading "cleanup" %}} Deleting the Deployments and Services also deletes any running Pods. Use labels to delete multiple resources with one command. 1. Run the following commands to delete all Pods, Deployments, and Services. ```shell kubectl delete deployment -l app=redis kubectl delete service -l app=redis kubectl delete deployment frontend kubectl delete service frontend ``` The response should look similar to this: ``` deployment.apps "redis-follower" deleted deployment.apps "redis-leader" deleted deployment.apps "frontend" deleted service "frontend" deleted ``` 1. Query the list of Pods to verify that no Pods are running: ```shell kubectl get pods ``` The response should look similar to this: ``` No resources found in default namespace. ``` ## {{% heading "whatsnext" %}} * Complete the [Kubernetes Basics](/docs/tutorials/kubernetes-basics/) Interactive Tutorials * Use Kubernetes to create a blog using [Persistent Volumes for MySQL and Wordpress](/docs/tutorials/stateful-application/mysql-wordpress-persistent-volume/#visit-your-new-wordpress-blog) * Read more about [connecting applications with services](/docs/tutorials/services/connect-applications-service/) * Read more about [using labels effectively](/docs/concepts/overview/working-with-objects/labels/#using-labels-effectively)

This section continues the previous instructions and shows how to scale down the number of frontend Pods using `kubectl scale`. Then, it guides the user through cleaning up the deployment by deleting all the Pods, Deployments, and Services related to the Guestbook application using `kubectl delete` with label selectors. Finally, it provides suggestions for further exploration of Kubernetes topics.