Multiple schedulers - Kubernetes

 1. What is the name of the POD that deploys the default kubernetes scheduler in this environment?

-master $ kubectl get pods --namespace=kube-system

NAME                                      READY   STATUS             RESTARTS   AGE

coredns-66bff467f8-dbnft                  1/1     Running            0          43m

coredns-66bff467f8-gq8nw                  1/1     Running            0          43m

etcd-master                               1/1     Running            0          43m

katacoda-cloud-provider-58f89f7d9-t978s   0/1     CrashLoopBackOff   13         43m

kube-apiserver-master                     1/1     Running            0          43m

kube-controller-manager-master            1/1     Running            0          43m

kube-flannel-ds-amd64-4xjbh               1/1     Running            0          43m

kube-flannel-ds-amd64-xs95v               1/1     Running            1          42m

kube-keepalived-vip-bchtm                 1/1     Running            0          42m

kube-proxy-4qblt                          1/1     Running            0          42m

kube-proxy-dswp9                          1/1     Running            0          43m

kube-scheduler-master                     1/1     Running            0          43m

Based on these , the answer seems to be kube-schdeuler-master.

2.What is the image used to deploy the kubernetes scheduler? Inspect the kubernetes scheduler pod and identify the image

master $ kubectl describe pod --namespace=kube-system kube-scheduler-master | grep -i image

    Image:         k8s.gcr.io/kube-scheduler:v1.18.0

    Image ID:      docker-pullable://k8s.gcr.io/kube-scheduler@sha256:33063bc856e99d12b9cb30aab1c1c755ecd458d5bd130270da7c51c70ca10cf6

Deploy an additional scheduler to the cluster following the given specification.

Use the manifest file used by kubeadm tool. Use a different port than the one used by the current one.

kube-apiserver.yaml           kube-scheduler.yaml

master $ vi /etc/kubernetes/manifests/kube-scheduler.yaml

master $ vi /var/answers/my-scheduler.yaml

master $ cp /etc/kubernetes/manifests/kube-scheduler.yaml my-scheduler.yaml

master $ vi my-scheduler.yaml

Make few changes like name, port number and save it.

master $ vi my-scheduler.yaml

master $ vi my-scheduler.yaml

master $ kubectl apply -f my-scheduler.yaml

A pod definition file is given. Use it to create a POD with with the new custom scheduler. File is located at /root/nginx-pod.yaml

-- Go to the yaml file and under spec section add schedulerName: my-custom-scheduler

and then run kubectl apply -f /root/nginx.yaml