16-CUSTOM SCHEDULER

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CUSTON SCHEDULER
command to get a yaml from running pod - kubectl -n <namespace> get <resource type> <resource Name> -o yaml

example yaml to create a custom scheduler - (cat > scheduler-definition.yaml)

apiVersion: v1
kind: Pod
metadata:
  name: my-scheduler (scheduler name)
  namespace: kube-system
spec:
  containers:
  - command:
    - kube-scheduler
    - --authentication-kubeconfig=/etc/kubernetes/scheduler.conf
    - --authorization-kubeconfig=/etc/kubernetes/scheduler.conf
    - --bind-address=127.0.0.1
    - --kubeconfig=/etc/kubernetes/scheduler.conf
    - --leader-elect=false
    - --scheduler-name=my-scheduler (scheduler name)
    - --lock-object-namespace=my-scheduler (scheduler name)
    image: k8s.gcr.io/kube-scheduler:v1.20.0
    imagePullPolicy: IfNotPresent
    name: kube-scheduler-mine


yaml file to create a pod using custom scheduler-definition

apiVersion: v1
kind: Pod
metadata:
  name: nginx
spec:
  containers:
  - image: nginx
    name: nginx
  schedulerName: my-scheduler
  
  reference links - 
  
  Please check the following:

https://github.com/kubernetes/community/blob/master/contributors/devel/sig-scheduling/scheduler.md

https://kubernetes.io/blog/2017/03/advanced-scheduling-in-kubernetes/

https://jvns.ca/blog/2017/07/27/how-does-the-kubernetes-scheduler-work/

https://stackoverflow.com/questions/28857993/how-does-kubernetes-scheduler-work

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