CheatSheet
Here’s a tip!
As you might have seen already, creating and editing YAML files is a bit difficult, especially in the CLI. During the exam, you might find it difficult to copy and paste YAML files from the browser to the terminal. Using the kubectl run command can help in generating a YAML template. And sometimes, you can even get away with just the kubectl run command without having to create a YAML file at all. For example, if you were asked to create a pod or deployment with a specific name and image, you can simply run the kubectl run command.
Use the below set of commands and try the previous practice tests again, but this time, try to use the below commands instead of YAML files. Try to use these as much as you can going forward in all exercises.
Reference (Bookmark this page for the exam. It will be very handy):
https://kubernetes.io/docs/reference/kubectl/conventions/
Create an NGINX Pod
kubectl run nginx --image=nginx Generate POD Manifest YAML file (-o yaml). Don’t create it(–dry-run)
kubectl run nginx --image=nginx --dry-run=client -o yaml Create a deployment
kubectl create deployment --image=nginx nginx Generate Deployment YAML file (-o yaml). Don’t create it(–dry-run)
kubectl create deployment --image=nginx nginx --dry-run=client -o yaml Generate Deployment YAML file (-o yaml). Don’t create it(–dry-run) and save it to a file.
kubectl create deployment --image=nginx nginx --dry-run=client -o yaml > nginx-deployment.yaml Make necessary changes to the file (for example, adding more replicas) and then create the deployment.
kubectl create -f nginx-deployment.yaml OR
In k8s version 1.19+, we can specify the –replicas option to create a deployment with 4 replicas.
kubectl create deployment --image=nginx nginx --replicas=4 --dry-run=client -o yaml > nginx-deployment.yaml
kubectl get deployment knative-operator -n knative-operator --show-labels
kubectl get deployment operator-webhook -n knative-operator --show-labels
kubectl get deployments -n knative-operator --show-labels
kubectl get deployment knative-operator -n knative-operator -o yaml | grep -A 5 "labels:"
kubectl get deployment operator-webhook -n knative-operator -o yaml | grep -A 5 "labels:"
kubectl get deployments -n knative-operator \
-o custom-columns=NAME:.metadata.name,APP:.metadata.labels.app,ENV:.metadata.labels.environment