Kubernetes bash scheduler

This is a really bad idea

I made it because it was helpful for me to learn 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 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