Manually trigger kubernetes cronjob fails - kubernetes

Question

My k8s version:
kubectl version
Client Version: version.Info{Major:"1", Minor:"22", GitVersion:"v1.22.2", GitCommit:"8b5a19147530eaac9476b0ab82980b4088bbc1b2", GitTreeState:"clean", BuildDate:"2021-09-15T21:38:50Z", GoVersion:"go1.16.8", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"20+", GitVersion:"v1.20.7-eks-d88609", GitCommit:"d886092805d5cc3a47ed5cf0c43de38ce442dfcb", GitTreeState:"clean", BuildDate:"2021-07-31T00:29:12Z", GoVersion:"go1.15.12", Compiler:"gc", Platform:"linux/amd64"}
WARNING: version difference between client (1.22) and server (1.20) exceeds the supported minor version skew of +/-1
My cronjob file:
apiVersion: batch/v1beta1
kind: CronJob
metadata:
labels:
app: git-updater
name: git-updater
namespace: my-ns
spec:
concurrencyPolicy: Replace
failedJobsHistoryLimit: 2
jobTemplate:
spec:
template:
metadata:
labels:
app: git-updater
name: git-updater
spec:
containers:
- args:
- sh
- -c
- apk add --no-cache git openssh-client && cd /repos && ls -d */*.git/
| while read dir; do cd /repos/$dir; git gc; git fetch --prune; done
image: alpine
name: updater
volumeMounts:
- mountPath: test
name: test
- mountPath: test
name: test
restartPolicy: Never
volumes:
- persistentVolumeClaim:
claimName: pvc
name: repos
schedule: '#daily'
successfulJobsHistoryLimit: 4
...
When I create the job from file, all goes well:
kubectl -n my-ns create -f git-updater.yaml
cronjob.batch/git-updater created
But I would like to trigger it manually just for testing purposes, so I do:
kubectl -n my-ns create job --from=cronjob/git-updater test-job
error: unknown object type *v1beta1.CronJob
Which is strange because I have just been able to create it from file.
In another similar post it was suggested to switch from ApiVersion v1beta1 to v1.... but when I do so then I get:
kubectl -n my-ns create -f git-updater.yaml
error: unable to recognize "git-updater.yaml": no matches for kind "CronJob" in version "batch/v1"
I am a little stuck here, how can I test my newly and successfully created CronJob?

Answer 1

That's your v1.20 cluster version, that doing that.
Short answer is you should upgrade cluster to 1.21, where cronjobs works more or less stable.
Check
no matches for kind "CronJob" in version "batch/v1" , especially comment
One thing is the api-version, another one is in which version the
resource you are creating is available. By version 1.19.x you do have
batch/v1 as an available api-resource, but you don't have the resource
CronJob under it.
Kubernetes Create Job from Cronjob not working
I have an 1.20.9 GKE cluster and face the same issue as you
$kubectl version
Client Version: version.Info{Major:"1", Minor:"22", GitVersion:"v1.22.2", GitCommit:"8b5a19147530eaac9476b0ab82980b4088bbc1b2", GitTreeState:"clean", BuildDate:"2021-09-15T21:38:50Z", GoVersion:"go1.16.8", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"20+", GitVersion:"v1.20.9-gke.1001", GitCommit:"1fe18c314ed577f6047d2712a9d1c8e498e22381", GitTreeState:"clean", BuildDate:"2021-08-23T23:06:28Z", GoVersion:"go1.15.13b5", Compiler:"gc", Platform:"linux/amd64"}
WARNING: version difference between client (1.22) and server (1.20) exceeds the supported minor version skew of +/-1
cronjob.batch/git-updater created
$kubectl -n my-ns create job --from=cronjob/git-updater test-job
error: unknown object type *v1beta1.CronJob
At the same time, your cronjob yaml perfectly works with apiVersion: batch/v1 on 1.21 GKE one.
$kubectl version
Client Version: version.Info{Major:"1", Minor:"22", GitVersion:"v1.22.2", GitCommit:"8b5a19147530eaac9476b0ab82980b4088bbc1b2", GitTreeState:"clean", BuildDate:"2021-09-15T21:38:50Z", GoVersion:"go1.16.8", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.3-gke.2001", GitCommit:"77cdf52c2a4e6c1bbd8ae4cd75c864e9abf4c79e", GitTreeState:"clean", BuildDate:"2021-08-20T18:38:46Z", GoVersion:"go1.16.6b7", Compiler:"gc", Platform:"linux/amd64"}
$kubectl -n my-ns create -f cronjob.yaml
cronjob.batch/git-updater created
$ kubectl -n my-ns create job --from=cronjob/git-updater test-job
job.batch/test-job created
$kubectl describe job test-job -n my-ns
Name: test-job
Namespace: my-ns
Selector: controller-uid=ef8ab972-cff1-4889-ae11-60c67a374660
Labels: app=git-updater
controller-uid=ef8ab972-cff1-4889-ae11-60c67a374660
job-name=test-job
Annotations: cronjob.kubernetes.io/instantiate: manual
Parallelism: 1
Completions: 1
Start Time: Tue, 02 Nov 2021 17:54:38 +0000
Pods Statuses: 1 Running / 0 Succeeded / 0 Failed
...
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal SuccessfulCreate 16m job-controller Created pod: test-job-vcxx9