Solution Taints And Tolerations

• How many nodes exist on the system:

  kubectl get nodes
  

• Do any taints exist?
  • Use kubectl describe node <node_name>
• How to create a taint on Node01:

  kubectl taint node node01 spray=mortein:NoSchedule
  

• To check help, use kubectl taint --help and there are multiple examples there.
  • Key is spray. Value is mortein and the Effect is NoSchedule
• Can then check the above under Taints from kubectl describe ~
• Create a pod with kubectl run <pod> --image=nginx
• Cannot specify Toleration Imperatively in the command line.
• Then we do the following to generate a yaml file for the pod:

  kubectl run bee --image=nginx --dry-run=client -o yaml > bee.yaml
  

• Then edit the bee.yaml file with these tolerations:

  tolerations:
       - key: spray
         value: mortein
         effect: NoSchedule
         operator: Equal
  

• Then create the image: kubectl create -f bee.yaml
• Check for all pods and which nodes they are assigned to with kubectl get pods -o wide
• To remove a taint:

  kubectl taint node controlplane node-role.kubernetes.io/master:NoSchedule-