K8s-JsonPath.txt

JSON PATH: https://kubernetes.io/docs/reference/kubectl/jsonpath/

$ —> root element

K get po -o json

Example:
K get po -o=jsonpath=‘{.items[0].spec.containers[0].image}’

{“\n”}. New Line
{“”\t} Tab

K get po -o=jsonpath=‘{.items[*].metadata.name} {“\n”} {.items[*].status.capacity.cpu}’

For each item is range.

‘{range .items[*]}
        {.metadata.name}{“\t”} {.status.capacity.cpu} {“\n”}
{end}’


#Customer columns:
K get nodes -o=custom-colums=<COLUMN NAME>: <JSON PATH>

K get nodes -o=custom-colums=NODE: .metadata.name
Note : we don’t need .items as custom columns think the query is for all the elements in the list



#More columns can be added by coma.
K get nodes -o=custom-columns=NODE: .metadata.name,CPU:.status.capacity.cpu

#Sort option
K get nodes —sort-by= .metada.name
K get nodes —sort-by= .status.capacity.cpu

kubectl get nodes -o=jsonpath="{.items[*]['status.nodeInfo.osImage']}"


kubectl get pv --sort-by=.spec.capacity.storage -o=custom-columns=NAME:.metadata.name,CAPACITY:.spec.capacity.storage
kubectl get pv --sort-by=.spec.capacity.storage -o=custom-columns=NAME:.metadata.name,CAPACITY:.spec.capacity.storage

K get deploy —sort-by=.metadata.name -o=custom-columns=DEPLOYMENT:.metadata.name,CONTAINER_IMAGE:.spec.template.spec.containers.image, READY_REPLICAS:.status.readyReplicas