Create a job

 

Create a job but ensure that it will be automatically terminated by kubernetes if it takes more than 30 seconds to execute

show

kubectl create job busybox --image=busybox --dry-run=client -o yaml -- /bin/sh -c 'while true; do echo hello; sleep 10;done' > job.yaml
vi job.yaml

Add job.spec.activeDeadlineSeconds=30

apiVersion: batch/v1
kind: Job
metadata:
  creationTimestamp: null
  labels:
    run: busybox
  name: busybox
spec:
  activeDeadlineSeconds: 30 # add this line
  template:
    metadata:
      creationTimestamp: null
      labels:
        run: busybox
    spec:
      containers:
      - args:
        - /bin/sh
        - -c
        - while true; do echo hello; sleep 10;done
        image: busybox
        name: busybox
        resources: {}
      restartPolicy: OnFailure
status: {}

Create the same job, make it run 5 times, one after the other. Verify its status and delete it

show

kubectl create job busybox --image=busybox --dry-run=client -o yaml -- /bin/sh -c 'echo hello;sleep 30;echo world' > job.yaml
vi job.yaml

Add job.spec.completions=5

apiVersion: batch/v1
kind: Job
metadata:
  creationTimestamp: null
  labels:
    run: busybox
  name: busybox
spec:
  completions: 5 # add this line
  template:
    metadata:
      creationTimestamp: null
      labels:
        run: busybox
    spec:
      containers:
      - args:
        - /bin/sh
        - -c
        - echo hello;sleep 30;echo world
        image: busybox
        name: busybox
        resources: {}
      restartPolicy: OnFailure
status: {}

kubectl create -f job.yaml

Verify that it has been completed:

kubectl get job busybox -w # will take two and a half minutes
kubectl delete jobs busybox

Create the same job, but make it run 5 parallel times

show

vi job.yaml

Add job.spec.parallelism=5

apiVersion: batch/v1
kind: Job
metadata:
  creationTimestamp: null
  labels:
    run: busybox
  name: busybox
spec:
  parallelism: 5 # add this line
  template:
    metadata:
      creationTimestamp: null
      labels:
        run: busybox
    spec:
      containers:
      - args:
        - /bin/sh
        - -c
        - echo hello;sleep 30;echo world
        image: busybox
        name: busybox
        resources: {}
      restartPolicy: OnFailure
status: {}

kubectl create -f job.yaml
kubectl get jobs

It will take some time for the parallel jobs to finish (>= 30 seconds)

kubectl delete job busybox