在我们正常安装kubernetes1.18.6之后，可能会出现一下错误：

[root@k8s-master manifests]# kubectl get cs
NAME                 STATUS      MESSAGE                                                                                     ERROR
scheduler            Unhealthy   Get http://127.0.0.1:10251/healthz: dial tcp 127.0.0.1:10251: connect: connection refused
controller-manager   Unhealthy   Get http://127.0.0.1:10252/healthz: dial tcp 127.0.0.1:10252: connect: connection refused
etcd-0               Healthy     {"health":"true"}

出现这种情况，是/etc/kubernetes/manifests下的kube-controller-manager.yaml和kube-scheduler.yaml设置的默认端口是0，在文件中注释掉就可以了

kube-controller-manager.yaml文件修改：注释掉27行

 1 apiVersion: v1
  2 kind: Pod
  3 metadata:
  4   creationTimestamp: null
  5   labels:
  6     component: kube-controller-manager
  7     tier: control-plane
  8   name: kube-controller-manager
  9   namespace: kube-system
 10 spec:
 11   containers:
 12   - command:
 13     - kube-controller-manager
 14     - --allocate-node-cidrs=true
 15     - --authentication-kubeconfig=/etc/kubernetes/controller-manager.conf
 16     - --authorization-kubeconfig=/etc/kubernetes/controller-manager.conf
 17     - --bind-address=127.0.0.1
 18     - --client-ca-file=/etc/kubernetes/pki/ca.crt
 19     - --cluster-cidr=10.244.0.0/16
 20     - --cluster-name=kubernetes
 21     - --cluster-signing-cert-file=/etc/kubernetes/pki/ca.crt
 22     - --cluster-signing-key-file=/etc/kubernetes/pki/ca.key
 23     - --controllers=*,bootstrapsigner,tokencleaner
 24     - --kubeconfig=/etc/kubernetes/controller-manager.conf
 25     - --leader-elect=true
 26     - --node-cidr-mask-size=24
 27   #  - --port=0
 28     - --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.crt
 29     - --root-ca-file=/etc/kubernetes/pki/ca.crt
 30     - --service-account-private-key-file=/etc/kubernetes/pki/sa.key
 31     - --service-cluster-ip-range=10.1.0.0/16
 32     - --use-service-account-credentials=true

kube-scheduler.yaml配置修改：注释掉19行

 1 apiVersion: v1
  2 kind: Pod
  3 metadata:
  4   creationTimestamp: null
  5   labels:
  6     component: kube-scheduler
  7     tier: control-plane
  8   name: kube-scheduler
  9   namespace: kube-system
 10 spec:
 11   containers:
 12   - command:
 13     - kube-scheduler
 14     - --authentication-kubeconfig=/etc/kubernetes/scheduler.conf
 15     - --authorization-kubeconfig=/etc/kubernetes/scheduler.conf
 16     - --bind-address=127.0.0.1
 17     - --kubeconfig=/etc/kubernetes/scheduler.conf
 18     - --leader-elect=true
 19   #  - --port=0

然后三台机器均重启kubelet

[root@k8s-master ]# systemctl restart kubelet.service

再次查看，就正常啦

[root@k8s-master manifests]# kubectl get cs
NAME                 STATUS    MESSAGE             ERROR
scheduler            Healthy   ok
controller-manager   Healthy   ok
etcd-0               Healthy   {"health":"true"}