I have a daily k8s cron job, I need to have unique id for every created job, which is same on job restart in case of job failure. Example:
2021-04-10, restarts:0, id = 1234 -> failed
2021-04-10, restarts:1, id = 1234 -> failed
2021-04-10, restarts:2, id = 1234 -> failed
2021-04-11, restarts:0, id 1235 -> failed
2021-04-11, restarts:1, id 1235 -> failed
2021-04-12, restarts:0, id 1236 -> success
2021-04-13, restarts:0, id 1237 -> success
Is there a way I generate such a variable ?
Is there a way I generate such a variable ?
Yes, with usage of UID. Every object created over the whole lifetime of a Kubernetes cluster has a distinct UID. It is intended to distinguish between historical occurrences of similar entities.
This UID then can be expose as environment variable and injected into your pod:
apiVersion: batch/v1beta1
kind: CronJob
metadata:
name: hello
spec:
schedule: "*/1 * * * *"
jobTemplate:
spec:
template:
spec:
containers:
- name: hello
image: busybox
imagePullPolicy: IfNotPresent
env:
- name: MY_UID
valueFrom:
fieldRef:
fieldPath: metadata.uid
command:
- /bin/sh
- -c
- date; echo $MY_UID
restartPolicy: OnFailure
And here you have printed out the unique UID:
ā ~ k logs hello-1618817040-4jkpx
Mon Apr 19 07:24:02 UTC 2021
f9060e34-a4e8-40d2-b459-6029b07e4fe7
You can use it directly or you can hash it and make it into any datatype you want.