as a preparation I'll tell what I know
When I run kubectl logs --previous <pod_name> I'll get last 20lines of logs before restart and timestamp when than happened, but I wanted to have that timestamp displayed when I run kubectl get pods as an additional column.
The kube docs on how to create custom columns show that
kubectl get pods <my_pod_name -o custom-columns=NAME:.metadata.name,RSRC:.metadata.resourceVersion
NAME RSRC
submit-queue 610995
but my question is where is this metadata/spec stored??? where can I list all possible metadata so I know what column to search or write, and same for spec and any other possible column
I know I can look at the pod with kubectl describe pod <pod> but how do I translate fields there to this .metadata.name format ?
Part of my descirbe looks like so
MacBook-Pro% kubectl describe pod xxx
Name: xxx
Namespace: xx
Priority: 0
Node: myname/myip
Start Time: Tue, 23 Feb 2021 11:37:01 +0100
Labels: app=xx
app.kubernetes.io/instance=xx
app.kubernetes.io/managed-by=Helm
app.kubernetes.io/name=xx
env=xx
helm.sh/chart=xx
pod-template-hash=yy
Annotations: kubectl.kubernetes.io/restartedAt: 2020-10-23T11:21:09+02:00
Status: Running
IP: 10.xx
IPs:
IP: 10.xx
Controlled By: ReplicaSet/xxx
Containers:
my_app:
Container ID: docker://xxxx
Image: gcr.ioxxxx
Image ID: docker-pullable://gcrxxx
Port: 8080/TCP
Host Port: 0/TCP
State: Running
Started: Fri, 12 Mar 2021 11:34:42 +0100
Last State: Terminated
Reason: Error
Exit Code: 143
Started: Fri, 05 Mar 2021 12:34:58 +0100
Finished: Fri, 12 Mar 2021 11:34:41 +0100
any thought how to get to Last State.Finished field ?
Would appreciate any help, thanks.
You can use kubectl get pod -o yaml to view your POD resource in the YAML format (or -o json if you prefer).
In this format, you can see the metadata keys and values. e.g.:
$ kubectl get po -o yaml my-nginx-5b56ccd65f-4vmms | head -n 5
apiVersion: v1
kind: Pod
metadata:
creationTimestamp: "2021-03-09T15:19:38Z"
generateName: my-nginx-5b56ccd65f-
You can also use kubectl explain pod to list and describe all possible fields associated with the pod API resource. It's possible to get the documentation of a specific field of a resource (e.g., kubectl explain pods.status.containerStatuses).
To get the Last State.Finished value you can use:
$ kubectl get pods my-nginx-5b56ccd65f-4vmms -o custom-columns=NAME:.metadata.name,FINISHED:.status.containerStatuses[*].lastState.terminated.finishedAt
NAME FINISHED
my-nginx-5b56ccd65f-4vmms 2021-03-09T15:35:45Z