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23-Practice-Test-Imperative-Commands.md

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Practice Test - Imperative Commands

Solutions for Practice Test - Imperative Commands

  • Run the command kubectl run nginx-pod --image=nginx:alpine.

    $ kubectl run nginx-pod --image=nginx:alpine

  • Run the command kubectl run redis --image=redis:alpine -l tier=db.

    $ kubectl run redis --image=redis:alpine -l tier=db

  • Run the command kubectl expose pod redis --port=6379 --name redis-service.

    $ kubectl expose pod redis --port=6379 --name redis-service

  • Run the command kubectl create deployment webapp --image=kodekloud/webapp-color. Then scale the webapp to 3 using command kubectl scale deployment/webapp --replicas=3.

    $ kubectl create deployment webapp --image=kodekloud/webapp-color
$ kubectl scale deployment/webapp --replicas=3

  • Run the command kubectl run custom-nginx --image=nginx --port=8080.

    $ kubectl run custom-nginx --image=nginx --port=8080

  • Run the command kubectl create ns dev-ns.

    $ kubectl create ns dev-ns

  • Run the command to create a deployment.

    Step 1: Create the deployment YAML file
$ kubectl create deployment redis-deploy --image redis --namespace=dev-ns --dry-run=client -o yaml > deploy.yaml
$ kubectl create -f deploy.yaml

Step 2: Edit the YAML file and add update the replicas to 2.

Step 3: Run kubectl apply -f deploy.yaml to create the deployment in the dev-ns namespace.
$ kubectl apply -f deploy.yaml

You can also use kubectl scale deployment or kubectl edit deployment to change the number of replicas once the object has been created.
$ kubectl edit deployment redis-deploy
$ kubectl scale deployment/redis-deploy --replicas=2 --namespace=dev-ns

In v1.19, kubectl create deployment supports "--replicas" flag to increase the count number.
$ kubectl create deployment redis-deploy --image=redis --namespace=dev-ns --replicas=2

  • First create a YAML file for both the pod and service like this: kubectl run httpd --image=httpd:alpine --port=80 --expose.

    $ kubectl run httpd --image=httpd:alpine --port=80 --expose