Kubernetes Commands

Question 1

GCloud command to retrieve credentials that provides permissions to execute kubectl commands on a GCP cluster.

(Must be run at least once per cluster, does not need to be called a second time unless you lose credentials from your $HOME/.kube/config directory)

Answer 1

gcloud container clusters get-credentials [CLUSTER_NAME] –zone [ZONE_NAME]

Question 2

kubectl command that lists all pods in the namespace

Answer 2

kubectl get pods

Question 3

declarative kubectl deploy command using a manifest file?

Answer 3

kubectl apply -f [DEPLOYMENT_FILE]

Question 4

imperative kubectl deploy command

Answer 4

kubectl run [DEPLOYMENT_NAME]

• -image
• -replicas
• -labels
• -port
• -generator (specifies api version)
• -save-config (saves config for future use)

Question 5

Describe the steps create a kubernetes deployment using the GCP console.

Answer 5

console.cloud.google.com > Hamburger (top left) > Kubernetes Engine (Compute) > Workloads > Deploy > provide the repo or use an existing container > Deploy

Question 6

What is the command for autoscaling a deployment between a minimum and maximum number of pods?

Why would you need to autoscale a deployment?

Answer 6

kubectl autoscale deployment [DEPLOYMENT_NAME]

• -min=5
• -max=15
• -cpu-percent=75

You would want to autoscale a deployment so as not to exceed the bounds of your resources for billing or performance of prod resources.

Question 7

What is the command for rolling back a deployment?

Answer 7

kubectl rollout undo deployment [deployment_name]

Question 8

What are the commands for a canary style deployment?

Answer 8

kubectl apply -f my-app-v2.yaml
kubectl scale deploy/my-app-v2 -replicas=5
kubectl delete -f my-app-v1.yaml

Question 9

What is the command to view the rollout history?

Answer 9

kubectl rollout history deployment [deployment_name] –revision=2

Question 10

What is the command to rollback to a specific version?

Answer 10

kubectl rollout undo deployment [deployment_name] –revision=2

Question 11

How do you rollback using the cloud console?

Answer 11

You can’t. The cloud console doesn’t have a direct rollback feature.
You can gcloud authenticate using:
gcloud container clusters get-credentials [CLUSTER_NAME] –zone [ZONE_NAME]

Then use any of the following to rollback:
kubectl rollout undo deployment [deployment_name]

kubectl rollout undo deployment [deployment_name] –revision=2

Question 12

What is the command to pause a rollout of a deployment?

Why would you need to pause a deployment?

Answer 12

kubectl rollout pause deployment [deployment_name]

A deployment should be paused if you see issues arise and suspect the deployment is linked to those issues being logged in metrics, analytics, or logs.

Question 13

What is the command to resume a deployment?

Answer 13

kubectl rollout resume deployment [deployment_name]

Question 14

What is the command to delete a deployment?

Answer 14

kubectl delete deployment [deployment_name]

Question 15

Using the gcp console, how do you scale a kubernetes deployment?

Answer 15

console.cloud.google.com > Navigation (top left Hamburger) > Kubernetes Engine > Workloads > click a deployment > Actions > Scale > enter a number > click Scale

Question 16

kubectl command for updating a container image?

Answer 16

kubectl set image
[deployment_version]/[deployment_name]
[image_name]=[image_name]:[image_version] –record

Question 17

kubectl command for deleting an object

Answer 17

kubectl delete [type] [object-name]