Deploying a kubernetes job via helm

Question

I am new to helm and I have tried to deploy a few tutorial charts. Had a couple of queries:

1. I have a Kubernetes job which I need to deploy. Is it possible to deploy a job via helm?

2. Also, currently my kubernetes job is deployed from my custom docker image and it runs a bash script to complete the job. I wanted to pass a few parameters to this chart/job so that the bash commands takes the input parameters. That's the reason I decided to move to helm because it provided a more flexibility. Is that possible?

Answer 1

You can use Helm Hooks to run jobs. Depending on how you set up your annotations you can run a different type of hook (pre-install, post-install, pre-delete, post-delete, pre-upgrade, post-upgrade, pre-rollback, post-rollback, crd-install). An example from the doc is as follows:

apiVersion: batch/v1
kind: Job
metadata:
  name: "{{.Release.Name}}"
  labels:
    app.kubernetes.io/managed-by: {{.Release.Service | quote }}
    app.kubernetes.io/instance: {{.Release.Name | quote }}
    helm.sh/chart: "{{.Chart.Name}}-{{.Chart.Version}}"
  annotations:
    # This is what defines this resource as a hook. Without this line, the
    # job is considered part of the release.
    "helm.sh/hook": post-install
    "helm.sh/hook-weight": "-5"
    "helm.sh/hook-delete-policy": hook-succeeded
spec:
  template:
    metadata:
      name: "{{.Release.Name}}"
      labels:
        app.kubernetes.io/managed-by: {{.Release.Service | quote }}
        app.kubernetes.io/instance: {{.Release.Name | quote }}
        helm.sh/chart: "{{.Chart.Name}}-{{.Chart.Version}}"
    spec:
      restartPolicy: Never
      containers:
      - name: post-install-job
        image: "alpine:3.3"
        command: ["/bin/sleep","{{default "10" .Values.sleepyTime}}"]

You can pass your parameters as secrets or configMaps to your job as you would to a pod.