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09-Node-Affinity.md

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Node Affinity

In this section, we will talk about "Node Affinity" feature in kubernetes.

The primary feature of Node Affinity is to ensure that the pods are hosted on particular nodes.

  • With Node Selectors we cannot provide the advance expressions.

    apiVersion: v1
kind: Pod
metadata:
 name: myapp-pod
spec:
 containers:
 - name: data-processor
   image: data-processor
 nodeSelector:
  size: Large

    ns-old

    apiVersion: v1
kind: Pod
metadata:
 name: myapp-pod
spec:
 containers:
 - name: data-processor
   image: data-processor
 affinity:
   nodeAffinity:
     requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: size
            operator: In
            values: 
            - Large
            - Medium

    na

    apiVersion: v1
kind: Pod
metadata:
 name: myapp-pod
spec:
 containers:
 - name: data-processor
   image: data-processor
 affinity:
   nodeAffinity:
     requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: size
            operator: NotIn
            values: 
            - Small

    na1

    apiVersion: v1
kind: Pod
metadata:
 name: myapp-pod
spec:
 containers:
 - name: data-processor
   image: data-processor
 affinity:
   nodeAffinity:
     requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: size
            operator: Exists

    na2

Node Affinity Types

  • Available

    • requiredDuringSchedulingIgnoredDuringExecution
    • preferredDuringSchedulingIgnoredDuringExecution

  • Planned

    • requiredDuringSchedulingRequriedDuringExecution
    • preferredDuringSchedulingRequiredDuringExecution

    nat

Node Affinity Types States

nats

nats1

K8s Reference Docs