Kubernetes resource requests/limits based on time plan

We can define memory and cpu requests/limits for pods, it is not a problem. Is it possible to define different memory and cpu requests/limits based on time plan? I think about something like that:

8AM - 8PM
 - CPU request 0.5, limit 2
 - RAM request 1Gi, limit 2Gi
8:01PM - 7:59AM
 - CPU request 0.1, limit 0.5
 - RAM request 500Mi, limit 1Gi

It can help us with tuning of performance based on e.g. high performance real-time processing during the day and lower performance the same pods during the night. Did you solve similar challenge?

This is not something supported by kubernetes core.

This has been discussed many times (here or there for example)

I can see two ways of solving this challenge :

• Using a cronJob and an image that embeds a kubectl binary to patch up/down your ressources

apiVersion: batch/v2alpha1
kind: CronJob
metadata:
  name: patch-memory
spec:
  schedule: "0 8 * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: scale
            image: <your-repo>/kubectl:<tag>
            command:
            - kubectl.sh
            - kubectl
            - patch
            - deployment
            - <your deployment>
            - --patch 
            - '{"spec": {"template": {"spec": {"containers": [{"name": "<your container>": {"resources": {"requests": {"memory": "XXXMi" }}}}]}}}}'
          restartPolicy: OnFailure

• Using a custom controler like this one or this one or others you can find online. I have no experience using those projects myself.

You could also consider using Horizontal Pod Autoscaling : This allows you to add more pod on a deployment or statefulsets based on resources usage.

On another hand, you could also use VPA. This will dynamically set resources requests/limits on your workload based on their resources usage - not in a cron style like you mentioned