# Problem Description:
How to resolve scheduler and controller-manager unhealthy state in Kubernetes

# Symptom:
$ kubectl get cs / kubectl get componentstatuses
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME                 STATUS      MESSAGE                                                              ERROR
controller-manager   Unhealthy   Get "http://127.0.0.1:10252/healthz": dial tcp 127.0.0.1:10252: connect: connection refused
scheduler            Unhealthy   Get "http://127.0.0.1:10251/healthz": dial tcp 127.0.0.1:10251: connect: connection refused
etcd-0               Healthy     {"health":"true"}

# Solution:
Modify the following files on all master nodes:

$ sudo vi /etc/kubernetes/manifests/kube-scheduler.yaml
Clear the line (spec->containers->command) containing this phrase: - --port=0

$ sudo vi /etc/kubernetes/manifests/kube-controller-manager.yaml
Clear the line (spec->containers->command) containing this phrase: - --port=0

$ sudo systemctl restart kubelet.service