CKA labs node affinity question

Kubernetes
#1

in your CKA labs of node affinity there is question of Set Node Affinity to the deployment to place the pods on node01 only.

Name: blue
Replicas: 3
Image: nginx
NodeAffinity: requiredDuringSchedulingIgnoredDuringExecution
Key: color
values: blue

but i tried to do with ```
preferredDuringSchedulingIgnoredDuringExecution and i use this yaml file:

apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: blue
name: blue
spec:
replicas: 3
selector:
matchLabels:
app: blue
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: blue
spec:
containers:
- image: nginx
name: nginx

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

    resources: {}

status: {}

but i ran this command : kubectl create -f blue-deploy.yaml
error: error validating “blue-deploy.yaml”: error validating data: [ValidationError(Deployment.spec.template.spec.affinity.nodeAffinity.preferredDuringSchedulingIgnoredDuringExecution): invalid type for io.k8s.api.core.v1.NodeAffinity.preferredDuringSchedulingIgnoredDuringExecution: got “map”, expected “array”, ValidationError(Deployment.spec.template.spec.affinity): unknown field “resources” in io.k8s.api.core.v1.Affinity]; if you choose to ignore these errors, turn validation off with --validate=false

It give above error

Screenshot from 2021-09-21 16-05-56
Screenshot from 2021-09-21 16-05-561329×1015 105 KB

#2

Hello, @anu
You can check the available Solution for this.

#3

yes i have check but still not work

#4

hmm, any different error? or facing same error?

#5

same error i got but i ran this

#6

actually i not set label color=blue i want to check this that with ```
preferredDuringSchedulingIgnoredDuringExecution

it will take  or not
#7

iam waiting for the solution

#8

Please, check the steps in the attached gif
Aff

#9

the gif that you share with requiredDuringSchedulingIgnoredDuringExecution it’s already working as you told before i want with not set label color=blue i want to check this that with ```
preferredDuringSchedulingIgnoredDuringExecution instead of required
could you please share this

#10

That nodeSelectorTerms field is not under the preferredDuringSchedulingIgnoredDuringExecution, it’s only available under the requiredDuringSchedulingIgnoredDuringExecution.
Please find the attached screenshot.

user-220
user-2201283×643 26.9 KB

Under the preferredDuringSchedulingIgnoredDuringExecution, there are only two fields:

  1. preference
  2. weight

user-219
user-2191299×733 33.9 KB

#11 
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: blue
  name: blue
spec:
  replicas: 3
  selector:
    matchLabels:
      app: blue
  template:
    metadata:
      labels:
        app: blue
    spec:
      containers:
      - image: nginx
        name: nginx
      affinity:
        nodeAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
            - weight: 1
              preference:
                matchExpressions:
                - key: color
                  operator: In
                  values:
                  - blue