틀린 문제 # Node Affinity

문제1

Set Node Affinity to the blue deployment to place the pods on node01 only.

Ensure that node01 has the label color=blue.

Requirements:

• Use requiredDuringSchedulingIgnoredDuringExecution node affinity
• Key: color
• Value: blue

If the label is not already set, apply it to node01 before updating the deployment.

---

✅ 1. node01에 color=blue 라벨 적용

kubectl label node node01 color=blue --overwrite

 

kubectl get node node01 --show-labels

 

→ color=blue 가 보이면 정상

---

✅ 2. blue Deployment에 Node Affinity 설정 추가

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

 

완성본

apiVersion: apps/v1
kind: Deployment
metadata:
  annotations:
    deployment.kubernetes.io/revision: "2"
  creationTimestamp: "2025-12-04T04:34:20Z"
  generation: 2
  labels:
    app: blue
  name: blue
  namespace: default
  resourceVersion: "4160"
  uid: c832f99c-0adc-4770-b684-db63eae9653d
spec:
  progressDeadlineSeconds: 600
  replicas: 3
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: blue
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: blue
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: color
                operator: In
                values:
                - blue
      containers:
      - image: nginx
        imagePullPolicy: Always
        name: nginx
        resources: {}
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 30
status:
  availableReplicas: 3
  conditions:
  - lastTransitionTime: "2025-12-04T04:34:27Z"
    lastUpdateTime: "2025-12-04T04:34:27Z"
    message: Deployment has minimum availability.
    reason: MinimumReplicasAvailable
    status: "True"
    type: Available
  - lastTransitionTime: "2025-12-04T04:34:20Z"
    lastUpdateTime: "2025-12-04T04:51:59Z"
    message: ReplicaSet "blue-56f4cbb9f6" has successfully progressed.
    reason: NewReplicaSetAvailable
    status: "True"
    type: Progressing
  observedGeneration: 2
  readyReplicas: 3
  replicas: 3
  updatedReplicas: 3

 

문제 2

Create a new deployment named red with the nginx image and 2 replicas, and ensure it gets placed on the controlplane node only.

Use the label key - node-role.kubernetes.io/control-plane - which is already set on the controlplane node.

 

Name: red
Replicas: 2
Image: nginx
NodeAffinity: requiredDuringSchedulingIgnoredDuringExecution
Key: node-role.kubernetes.io/control-plane
Use the right operator

 

---

✅ 요구사항 정리

• Deployment 이름: red
• replica: 2
• 이미지: nginx
• 스케줄링 위치: controlplane 노드 ONLY
• 이미 controlplane 노드에는 다음 라벨이 있음:
  node-role.kubernetes.io/control-plane=""
• NodeAffinity는 requiredDuringSchedulingIgnoredDuringExecution
• key는 node-role.kubernetes.io/control-plane
• value가 없으므로 operator는 Exists 사용해야 함

 

kubectl create deployment red --image=nginx --replicas=2

kubectl edit deployment red

apiVersion: apps/v1
kind: Deployment
metadata:
  annotations:
    deployment.kubernetes.io/revision: "2"
  creationTimestamp: "2025-12-04T05:04:52Z"
  generation: 2
  labels:
    app: red
  name: red
  namespace: default
  resourceVersion: "5637"
  uid: a36e8449-bc6c-4ecd-9f30-0abfa84f4c8d
spec:
  progressDeadlineSeconds: 600
  replicas: 2
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: red
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: red
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: node-role.kubernetes.io/control-plane
                operator: Exists
      containers:
      - image: nginx
        imagePullPolicy: Always
        name: nginx
        resources: {}
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 30
status:
  availableReplicas: 2
  conditions:
  - lastTransitionTime: "2025-12-04T05:04:54Z"
    lastUpdateTime: "2025-12-04T05:04:54Z"
    message: Deployment has minimum availability.
    reason: MinimumReplicasAvailable
    status: "True"
    type: Available
  - lastTransitionTime: "2025-12-04T05:04:52Z"
    lastUpdateTime: "2025-12-04T05:08:27Z"
    message: ReplicaSet "red-5557c78dc8" has successfully progressed.
    reason: NewReplicaSetAvailable
    status: "True"
    type: Progressing
  observedGeneration: 2
  readyReplicas: 2
  replicas: 2
  updatedReplicas: 2