I have a running k8s deployment, with one container.

I want to deploy 10 more containers, with a few differences in the deployment manifest (i.e command launched, container name, ...).

Rather than create 10 more .yml files with the whole deployment, I would prefer use templating. What can I do to achieve this ?

---
apiVersion: v1
kind: CronJob
metadata:
  name: myname
  labels:
    app.kubernetes.io/name: myname
spec:
  schedule: "*/10 * * * *"
  jobTemplate:
    spec:
      template:
        metadata:
          labels:
            app.kubernetes.io/name: myname
        spec:
          serviceAccountName: myname
          containers:
            - name: myname
              image: 'mynameimage'
              imagePullPolicy: IfNotPresent
              command: ["/my/command/to/launch"]
          restartPolicy: OnFailure

CodePudding user response：

Kustomize seems to be the go-to tool for templating, composition, multi-environment overriding, etc, in kubernetes configs. And it's built directly into kubectl now as well.

Specifically, I think you can achieve what you want by using the bases and overlays feature. Setup a base which contains the common structure and overlays which contain specific overrides.

CodePudding user response：

Either you can use Helm or Kustomize. Both are templating tools and help you to achieve your goal

CodePudding user response：

You can either specify a set of containers to be created you can do that like this:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: container1
        image: your-image
      - name: container2
        image: your-image
      - name: container3
        image: your-image

and you can repeat that container definition as many times as you want.

The other way around is to use a templating engine like helm/kustomize as mentioned above.