In this hands-on lab, you will be presented with a three-node cluster. You will need to deploy your application, so you can begin serving your end users. You will deploy the image from linuxacademycontent/kubeserve:v1 and then verify the deployment was successful. Once your application is running and serving clients, you will perform a rolling update, making sure the rollout is successful and there is no downtime for your end users. You will make use of the kubectl command line tool to perform all operations, in combination with the `set image` command to perform the rolling update to the new version. When you have verified the end users are now using version 2 of the app versus version 1, you may consider this hands-on lab complete.
Successfully complete this lab by achieving the following learning objectives:
- Create and roll out version 1 of the application, and verify a successful deployment.
Use the following YAML named
kubeserve-deployment.yamlto create your deployment:
apiVersion: apps/v1 kind: Deployment metadata: name: kubeserve spec: replicas: 3 selector: matchLabels: app: kubeserve template: metadata: name: kubeserve labels: app: kubeserve spec: containers: - image: linuxacademycontent/kubeserve:v1 name: app
Use the following command to create the deployment:
kubectl apply -f kubeserve-deployment.yaml --record
Use the following command to verify the deployment was successful:
kubectl rollout status deployments kubeserve
Use the following command to verify the app is at the correct version:
kubectl describe deployment kubeserve
- Scale up the application to create high availability.
Use the following command to scale up your application to five replicas:
kubectl scale deployment kubeserve --replicas=5
Use the following command to verify the additional replicas have been created:
kubectl get pods
- Create a service, so users can access the application.
Use the following command to create a service for your deployment:
kubectl expose deployment kubeserve --port 80 --target-port 80 --type NodePort
Use the following command to verify the service is present and collect the cluster IP:
kubectl get services
Use the following command to verify the service is responding:
- Perform a rolling update to version 2 of the application, and verify its success.
Use this curl loop command to see the version change as you perform the rolling update:
while true; do curl http://<ip-address-of-the-service>; done
Use this command to perform the update (while the curl loop is running):
kubectl set image deployments/kubeserve app=linuxacademycontent/kubeserve:v2 --v 6
Use this command to view the additional ReplicaSet created during the update:
kubectl get replicasets
Use this command to verify all pods are up and running:
kubectl get pods
Use this command to view the rollout history:
kubectl rollout history deployment kubeserve