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ImperativeDeployment.md

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Outline

1. Deploying a http-based application
2. Scaling Up & Down the Deployment
3. Rollout & Rollback a Deployment
4. Witness Desired State Management (Self Healing)

1. Deploying a http-based application
  • create a namespace 
    kubectl create namespace <your_desired_name>
  • permanently save the namespace for all subsequent kubectl commands in that context 
    kubectl config set-context --current --namespace demo
  • deploy a containerized http-based ping-pong application 
    kubectl create deployment ping-pong --image=pavankumar6/ping-pong:v1
  • list the pods 
    kubectl get pods
  • expose the application outside the cluster for accessing it 
    kubectl expose deployment ping-pong --type="NodePort" --port=8080
  • list the exposed service and check NodePort 
    kubectl get service ping-pong
  • get the EXTERNAL-IP of the underlying node 
    kubectl get nodes -owide
  • acccess the ping-pong application from your browser with the IP & Port obtained from above 
    http://<EXTERNAL_IP>:<NODE_PORT>/ping
http://<EXTERNAL_IP>:<NODE_PORT>/version

2. Scaling Up & Down the Deployment
  • scale up the deployment 
    kubectl scale deployment ping-pong --replicas=4
  • list the pods of the scaled up deployment 
    kubectl get pods

3 a. Rollout a Deployment

  • add runtime variable to the deployment

    kubectl set env deployment ping-pong COLOR=blue

  • access the updated deployment at http://<EXTERNAL_IP>:<NODE_PORT>/color

  • deploy a new version of the ping-pong application

    kubectl set image deployment/ping-pong ping-pong=pavankumar6/ping-pong:v2

  • access the new version of the deployment at http://<EXTERNAL_IP>:<NODE_PORT>/version

3 b. Rollback a Deployment
  • rollback of the ping-pong application deployment 
    kubectl rollout undo deployment ping-pong
  • access the rolled back version of the deployment at http://<EXTERNAL_IP>:<NODE_PORT>/version

4. Witness Desired State by Deleting a Pod
  • Delete any of the pod 
    kubectl get pods

kubectl delete pod <POD_NAME>

kubectl get pods