https://github.com/satyamsundaram/k8s-deployment-scaler-cron

https://github.com/satyamsundaram/k8s-deployment-scaler-cron

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• Host: GitHub
• URL: https://github.com/satyamsundaram/k8s-deployment-scaler-cron
• Owner: satyamsundaram
• Created: 2023-08-13T17:04:20.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2023-08-13T17:07:24.000Z (over 1 year ago)
• Last Synced: 2024-04-09T14:50:33.850Z (9 months ago)
• Language: Python
• Size: 1.95 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
### About

- here we have a demo of an nginx deployment in a kubernetes cluster

- which is scaled up to 2 replicas at 10:30 AM daily (UTC) and scaled down to 1 replica at 11:30 AM daily (UTC)

- with the help of cronjobs which also run in the same cluster and same namespace as the deployment

- these cronjobs make use of the k8s service account to communicate with the k8s API and

- use a python script which is available as a docker image on docker.io as **satyamsundaram01/scaler_script** to scale deployments

### How to run

- clone this repo

To use your own docker image, change the image name in the cronjob yaml files and build and push your image to docker.io:

```

cd scaler_script

docker build -t / .

docker login

docker push /

```

Apply the yaml files in the following order:

```

# create nginx-deployment

kubectl apply -f nginx-deployment.yaml

# create service account, role and role binding

kubectl apply -f serviceaccount.yaml

kubectl apply -f role.yaml

kubectl apply -f rolebinding.yaml

# scale up cron job, triggers at 10:30 AM daily (UTC)

kubectl apply -f scaleupcron.yaml

# scale down cron job, triggers at 11:30 AM daily (UTC)

kubectl apply -f scaledowncron.yaml

(we can trigger the cron jobs manually to test them)

```

And, there you have it, a deployment which scales up and down at a scheduled time daily.

You can modify this for your own use case.