Practice Test - Node Affinity

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Solutions to practice test - node affinity

Run the command 'kubectl describe node node01' and count the number of labels under Labels Section.
```
$ kubectl describe node node01
```
Run the command 'kubectl describe node node01' and see the label section
```
$ kubectl describe node node01
```
Run the command 'kubectl label node node01 color=blue'.
```
$ kubectl label node node01 color=blue
```

Run the below commands

$ kubectl create deployment blue --image=nginx
$ kubectl scale deployment blue --replicas=6

Check if master and node01 have any taints on them that will prevent the pods to be scheduled on them. If there are no taints, the pods can be scheduled on either node.
```
$ kubectl describe nodes|grep -i taints
$ kubectl get pods -o wide
```

Answer file at /var/answers/blue-deployment.yaml

$ kubectl edit deployment blue

Add the below under the template.spec section

affinity:
    nodeAffinity:
        requiredDuringSchedulingIgnoredDuringExecution:
          nodeSelectorTerms:
          - matchExpressions:
            - key: color
              operator: In
              values:
              - blue

Run the command 'kubectl get pods -o wide' and see the Node column
```
$ kubectl get pods -o wide
```

Answer file at /var/answers/red-deployment.yaml Add the below under the template.spec section

affinity:
     nodeAffinity:
       requiredDuringSchedulingIgnoredDuringExecution:
         nodeSelectorTerms:
         - matchExpressions:
           - key: node-role.kubernetes.io/master
             operator: Exists

$ kubectl create -f red-deployment.yaml

$ kubectl get pods -o wide