Does Kubernetes GET API actually support fieldSelector parameter to query values of array fields?
For example, I have a Pod like:
apiGroup: v1
kind: Pod
metadata:
ownerReferences:
- apiVersion: apps/v1
blockOwnerDeletion: true
controller: true
kind: ReplicaSet
name: grpc-ping-r7f8r-deployment-54d688d777
uid: 262bab1a-1c79-11ea-8e23-42010a800016Can I do something like:
kubectl get pods --field-selector 'metadata.ownerReferences.uid=262bab1a-1c79-11ea-8e23-42010a800016'This command fails (field label not supported: metadata.ownerReferences.uid). I suspect the reason is that ownerReferences is an array field itself. I've also tried, but didn't work:
metadata.ownerReferences[*].uid=metadata.ownerReferences[].uid=I might try client-go SDK for Kubernetes API, but I suspect it won't work for the same reason.
Is there a server-side way to query by this? Thanks much.
The --field-selector only works with some limited fields.
Which contains:
"metadata.name",
"metadata.namespace",
"spec.nodeName",
"spec.restartPolicy",
"spec.schedulerName",
"spec.serviceAccountName",
"status.phase",
"status.podIP",
"status.podIPs",
"status.nominatedNodeName"But you can perform the task by using jq. Here is a command that I used for listing all ready nodes. It demonstrates the use of array fields that you're looking for.
$ kubectl get nodes -o json | jq -r '.items[] | select(.status.conditions[] | select(.type=="Ready" and .status=="True")) | .metadata.name '
master-0
node-1
node-3