03-Advance-Kubectl-Commands.md

Advance Kubectl Commands

• Take me to the Lecture

• To get the output of kubectl in a json format:

  kubectl get nodes -o json
  

  kubectl get pods -o json 
  

  

• To get the image name used by pod via json path query:

  kubectl get pods -o=jsonpath='{.items[0].spec.containers[0].image}'
  

• To get the names of node in the cluster:

  kubectl get pods -o=jsonpath='{.items[*].metadata.name}'
  

  

• To get the architecture of node in the cluster:

  kubectl get pods -o=jsonpath='{.items[*].status.nodeInfo.architecture}'
  

• To get the count of the cpu of node in the cluster:

  kubectl get pods -o=jsonpath='{.items[*].status.status.capacity.cpu}'
  

Loops - Range

• To print the output in a separate column (one column with node name and other with CPU count):

  kubectl get nodes -o=custom-columns=NODE:.metadata.name ,CPU:.status.capacity.cpu
  

  

• Kubectl comes with a sort by property which can be combined with json path query to sort by name or CPU count

  kubectl get nodes --sort-by=.metadata.name
  

  

  kubectl get nodes --sort-by=..status.capacity.cpu