Get the apiVersion in Kubernetes
Everytime I have to create a manifest I stumble onto identifying which resource I have to do for apiVersion. For some of them things I could probably figure it out but I’d rather not just guess it.
The format is api_group/version (unless you are working with resource in the core API group, in which case you omit the api_group portion).
Let’s find the api group
We will run kubectl api-resources:
➜ ~ kubectl api-resources
NAME SHORTNAMES APIGROUP NAMESPACED KIND
bindings true Binding
componentstatuses cs false ComponentStatus
configmaps cm true ConfigMap
endpoints ep true Endpoints
events ev true Event
limitranges limits true LimitRange
namespaces ns false Namespace
nodes no false Node
persistentvolumeclaims pvc true PersistentVolumeClaim
persistentvolumes pv false PersistentVolume
pods po true Pod
Output truncated to avoid the really long output
In the third column, APIGROUP. If, for example, you’re creating a manifest for a new Deployment you could grep the output of kubectl api-resources and see that the API group is apps.
Let’s find the API group version
Because we now know the APIGROUP we will just get the version by using grep.
$ kubectl api-versions | grep -E "^apps/"
apps/v1
The result is the version we need.
Result
We are now ready to put the apiVersion for the Deployment in the cluster.
kind: Deployment
apiVersion: apps/v1
...
No more guessing the API version!