https://github.com/rothgar/bashscheduler

Kubernetes scheduler written in less than 100 lines of bash :grimacing: :laughing:
https://github.com/rothgar/bashscheduler

kubernetes

Last synced: 3 months ago
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Kubernetes scheduler written in less than 100 lines of bash :grimacing: :laughing:

• Host: GitHub
• URL: https://github.com/rothgar/bashscheduler
• Owner: rothgar
• Created: 2016-07-28T19:49:16.000Z (over 8 years ago)
• Default Branch: main
• Last Pushed: 2023-02-10T04:40:47.000Z (almost 2 years ago)
• Last Synced: 2024-06-10T02:35:57.046Z (7 months ago)
• Topics: kubernetes
• Language: Shell
• Homepage:
• Size: 120 KB
• Stars: 183
• Watchers: 5
• Forks: 18
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
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Kubernetes bash scheduler

============

### This is a really bad idea

I made it because it was helpful for me to learn :bowtie:

I hope you learn something too.

## How to run it 

Please don't ever use this on a production kubernetes cluster!!!

Run it against a local [kind](https://kind.sigs.k8s.io/) cluster.

```

kind create cluster

```

Create pods that use the custom scheduler.

```

kubectl apply -f https://raw.githubusercontent.com/rothgar/bashScheduler/main/nginx.deploy.yaml

```

You should see nginx pods with Pending status

```

NAME                     READY   STATUS    RESTARTS   AGE

nginx-56dcc974bc-8ss4m   0/1     Pending   0          49m                                              

nginx-56dcc974bc-94ltw   0/1     Pending   0          49m                                              

nginx-56dcc974bc-tnz6s   0/1     Pending   0          49m 

```

Then proxy your localhost to the kubernetes api server

```

kubectl proxy

Starting to serve on 127.0.0.1:8001

```

Now in a new terminal run

```

curl -sL https://raw.githubusercontent.com/rothgar/bashScheduler/main/scheduler.sh | bash

```

You should see similar output to

```

Assigned nginx-56dcc974bc-8ss4m to kind-control-plane

Assigned nginx-56dcc974bc-94ltw to kind-control-plane

Assigned nginx-56dcc974bc-tnz6s to kind-control-plane

```

Look at the code and see what it's doing.

Uncomment `set -x` to see all the commands run.

Have fun :shipit: