10-Labels and selectors

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LABELS and selectors

kubectl get pods --show-labels

command to select the pods based on the labes - kubectl get pods --selector <key>=<value>,<key2>=<value2>  ex - kubectl get pods --selector resion=US  or
   kubectl get pods -l <key>=<value>,<key2>=<value2>
   
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NODE LABEL AND SELECTORS
 command to add a label to node - kubectl label nodes <node-name> <key>=<value> example = kubectl label nodes node01 size=large
 command to show labels ona  node - kubectl get nodes <node-name> --shoe-labels or kubectl descibe node<nodename> |grep -i labels
 
 if node selector is set to a pod then the pod will be launched in the node with label of the node selector
 yaml to to cretae a pod with nodeSelector (cat > pod-definition.yaml)
 
 apiVersion: v1
 kind: Pod
 metadata:
    name:webapp-pod
	labels:
	   user: hari
spec:
   containers:
      - name: hari-container
        image: nginx
   nodeSelector:
      size: large  

limitaion of nodeSelector - we cannot say a pod to launch on nodes that doesnt have size=large, we can only say on which node the pod can be launched
 	  
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