my_proj/deployment lab.txt at master · sjha1010/my_proj · GitHub

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deployment lab commnads
Create the Deployment by running the following command:

kubectl apply -f https://k8s.io/examples/controllers/nginx-deployment.yaml

kubectl get deloyment

To see the Deployment rollout status, run kubectl rollout status deployment/nginx-deployment.

The output is similar to:

Waiting for rollout to finish: 2 out of 3 new replicas have been updated...
deployment "nginx-deployment" successfully rolled out

To see the ReplicaSet (rs) created by the Deployment, run kubectl get rs. The output is similar to this:

NAME                          DESIRED   CURRENT   READY   AGE
nginx-deployment-75675f5897   3         3         3       18s

To see the labels automatically generated for each Pod, run kubectl get pods --show-labels


-------------------lab2

Let's update the nginx Pods to use the nginx:1.16.1 image instead of the nginx:1.14.2 image.

kubectl set image deployment.v1.apps/nginx-deployment nginx=nginx:1.16.1
or use the following command:

kubectl set image deployment/nginx-deployment nginx=nginx:1.16.1

Alternatively, you can edit the Deployment and change .spec.template.spec.containers[0].image from nginx:1.14.2 to nginx:1.16.1:

kubectl edit deployment/nginx-deployment

To see the rollout status, run:

kubectl rollout status deployment/nginx-deployment

----------------------------------------------

Lab3
Suppose that you made a typo while updating the Deployment, by putting the image name as nginx:1.161 instead of nginx:1.16.1:


kubectl set image deployment/nginx-deployment nginx=nginx:1.161


The rollout gets stuck. You can verify it by checking the rollout status:


kubectl rollout status deployment/nginx-deployment


Press Ctrl-C to stop the above rollout status watch

kubectl get rs


Looking at the Pods created, you see that 1 Pod created by new ReplicaSet is stuck in an image pull loop.

kubectl get pods

Get the description of the Deployment:

kubectl describe deployment


Checking Rollout History of a Deployment

First, check the revisions of this Deployment:

kubectl rollout history deployment/nginx-deployment


To see the details of each revision, run:

kubectl rollout history deployment/nginx-deployment --revision=2


Rolling Back to a Previous Revision

Now you've decided to undo the current rollout and rollback to the previous revision:

kubectl rollout undo deployment/nginx-deployment


Alternatively, you can rollback to a specific revision by specifying it with --to-revision:

kubectl rollout undo deployment/nginx-deployment --to-revision=2


Check if the rollback was successful and the Deployment is running as expected, run:

kubectl get deployment nginx-deployment

------------------------------------

lab 4

You can scale a Deployment by using the following command:

kubectl scale deployment/nginx-deployment --replicas=10

kubectl autoscale deployment/nginx-deployment --min=10 --max=15 --cpu-percent=80