Kubernetes CKA sample exam question 17 with answer

Question
Taint the worker node node01 with details provided below.
Create a pod called dev-pod-nginx using image nginx, make sure that workloads are not scheduled to this worker node (node01).
Create another pod called prod-pod-nginx using image nginx with toleration to be scheduled on node01.
Details:
key: env_type
value: production
operator: Equal
Effect: NoSchedule

Answer
Get environment details:

kubectl get nodes
kubectl describe node controlplane | greo -i taint
kubectl describe node node01 | greo -i taint

We can see that there are no taints set on the nodes.
Now, taint node01:

kubectl taint node node01 env_type=production:NoSchedule

Verify:

kubectl describe node node01 | greo -i taint

Run dev pod:

kubectl run dev-pod-nginx --image=nginx

See, where it is running:

kubectl get po dev-pod-nginx -o wide

we can see that it is scheduled on controlplane
Generate YAML for prod pod:

kubectl run prod-pod-nginx --image=nginx --dry-run=client -o yaml > prod.yaml

Open prod.yaml and modify it in this way:

apiVersion: v1
kind: Pod
metadata:
  labels:
    run: prod-pod-nginx
  name: prod-pod-nginx
spec:
  tolerations:
  - key: "env_type"
    operator: "Equal"
    value: "production"
    effect: "NoSchedule"
  containers:
  - image: nginx
    name: prod-pod-nginx

Apply and check if the pod is running on node01:

kubectl apply -f prod.yaml
kubectl get po prod-pod-nginx -o wide

we can see that the pod prod-pod-nginx is running on node01