Get Ready status using kubectl -o=jsonpath - kubernetes

Question

I was trying to get the Ready status of pods by using -o=jsonpath.
To be more clear of what I want, I would like to get the value 1/1 of the following example using -o=jsonpath.
NAME READY STATUS RESTARTS AGE
some_pod 1/1 Running 1 34d
I have managed to get some information such as the pod name or namespace.
kubectl get pods --all-namespaces -o=jsonpath='{range .items[*]}{"\n"}{.metadata.namespace}{"\t"}{.metadata.name}{"\t"}{end}'
And I get somthing like:
some_namespace1 pod_name1
However, I don't know how to get the Ready status. What I would like to have is an aoutput similar to this:
some_namespace1 pod_name1 1/1
I know I can use bash commands like cut:
kubectl get pods --all-namespaces| tail -1 | cut -d' ' -f8
However, I would like to get it by using kubectl

Answer 1

You can get all the pods status using the following command:
kubectl get pods -o jsonpath={.items[*].status.phase}
Similar commands you can use for the name
kubectl get pods -o jsonpath={.items[*].metadata.name}
EDIT:
You need to compare the .status.replicas and .status.readyReplicas to get how many ready replicas are there.

Answer 2

I think this isn't directly reported in the Kubernetes API.
If you kubectl get pod ... -o yaml (or -o json) you'll get back an object matching a List (not included in the API docs) where each item is a Pod in the Kubernetes API, and -o jsonpath values follow that object structure. In particular a PodStatus has a list of ContainerStatus, each of which may or may not be ready, but the API itself doesn't return the counts as first-class fields.
There are a couple of different JSONPath implementations. I think Kubernetes only supports the syntax in the Kubernetes documentation, which doesn't include any sort of "length" function. (The original JavaScript implementation and a ready Googlable Java implementation both seem to, with slightly different syntax.)
The best I can come up with playing with this is to report all of the individual container "ready" statuses
kubectl get pods \
-o $'jsonpath={range .items[*]}{.metadata.name}\t{.status.containerStatuses[*].ready}\n{end}'
($'...' is bash/zsh syntax) but this still requires some post-processing to get back the original counts.