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08-Node-Selectors.md

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Node Selectors

In this section, we will take a look at Node Selectors in Kubernetes

We add new property called Node Selector to the spec section and specify the label.

  • The scheduler uses these labels to match and identify the right node to place the pods on. 
    apiVersion: v1
kind: Pod
metadata:
 name: myapp-pod
spec:
 containers:
 - name: data-processor
   image: data-processor
 nodeSelector:
  size: Large

nsel

  • To label nodes

    Syntax

    $ kubectl label nodes <node-name> <label-key>=<label-value>

    Example

    $ kubectl label nodes node-1 size=Large

ln

  • To create a pod definition 
    apiVersion: v1
kind: Pod
metadata:
 name: myapp-pod
spec:
 containers:
 - name: data-processor
   image: data-processor
 nodeSelector:
  size: Large

    $ kubectl create -f pod-definition.yml

nsel

Node Selector - Limitations

  • We used a single label and selector to achieve our goal here. But what if our requirement is much more complex.

nsl

  • For this we have Node Affinity and Anti Affinity

K8s Reference Docs