I am really new on kubernetes. I created a kubernetes cluster with this guide using kubeadm. The cluster consists of one master node and two nodes. Since I want to access the kubernetes web UI via master apiserver (by browser on my laptop), I modified /etc/kubernetes/manifests/kube-apiserver.yaml following these K8 WebUI, Access control. What I did is that I added the following args in /etc/kubernetes/manifests/kube-apiserver.yaml:

- --authentication-mode=basic
- --basic-auth-file=/etc/kubernetes/auth.csv
- hostPath:
  path: /etc/kubernetes/auth.csv
  name: kubernetes-dashboard
- mountPath: /etc/kubernetes/auth.csv
  name: kubernetes-dashboard
  readOnly: true

I have password and user name in auth.csv file. However, after I modified the .yaml file, my kube-apiserver process crashed. I checked by running ps -aux|grep kube to know which processes were running. The result was kube-scheduler,kube-controller-manager,/usr/bin/kubelet were all running but kube-apiserver process was not found. I was wondering what is a graceful way to restart kubernetes and let my cluster come back to the state immediately before changing the .yaml.

In addition, I will appreciate if someone could show me the exact steps to adding username/passwd authentication so that I can access Kubernetes Dashboad UI via browser on my laptop, Or any other way that can help me view the K8 Web UI on my mac laptop. I found a similar question similar question, but i still can not make it.

The environment:

• Three ubuntu 16 server: one master two nodes
• Kubernetes version 1.9
• I can SSH to the three machines and have root privilege.

update: the kube-apiserver.yaml file attached.

apiVersion: v1
kind: Pod
metadata:
  annotations:
    scheduler.alpha.kubernetes.io/critical-pod: ""
  creationTimestamp: null
  labels:
    component: kube-apiserver
    tier: control-plane
  name: kube-apiserver
  namespace: kube-system
spec:
  containers:
  - command:
    - kube-apiserver
    - --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.crt
    - --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.crt
    - --insecure-port=0
    - --advertise-address=172.16.28.125
    - --kubelet-client-certificate=/etc/kubernetes/pki/apiserver-kubelet-client.crt
    - --secure-port=6443
    - --enable-bootstrap-token-auth=true
    - --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
    - --requestheader-group-headers=X-Remote-Group
    - --requestheader-allowed-names=front-proxy-client
    - --service-account-key-file=/etc/kubernetes/pki/sa.pub
    - --client-ca-file=/etc/kubernetes/pki/ca.crt
    - --tls-private-key-file=/etc/kubernetes/pki/apiserver.key
    - --kubelet-client-key=/etc/kubernetes/pki/apiserver-kubelet-client.key
    - --allow-privileged=true
    - --requestheader-username-headers=X-Remote-User
    - --requestheader-extra-headers-prefix=X-Remote-Extra-
    - --service-cluster-ip-range=10.96.0.0/12
    - --admission-control=Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota
    - --tls-cert-file=/etc/kubernetes/pki/apiserver.crt
    - --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client.key
    - --authorization-mode=Node,RBAC
    - --etcd-servers=http://127.0.0.1:2379
    - --authentication-mode=basic
    - --basic-auth-file=/etc/kubernetes/auth.csv
    image: gcr.io/google_containers/kube-apiserver-amd64:v1.9.4
    livenessProbe:
      failureThreshold: 8
      httpGet:
        host: 172.16.28.125
        path: /healthz
        port: 6443
        scheme: HTTPS
      initialDelaySeconds: 15
      timeoutSeconds: 15
    name: kube-apiserver
    resources:
      requests:
        cpu: 250m
    volumeMounts:
    - mountPath: /etc/kubernetes/pki
      name: k8s-certs
      readOnly: true
    - mountPath: /etc/ssl/certs
      name: ca-certs
      readOnly: true
    - mountPath: /etc/pki
      name: ca-certs-etc-pki
      readOnly: true
    - mountPath: /etc/kubernetes/auth.csv
      name: kubernetes-dashboard
      readOnly: true
  hostNetwork: true
  volumes:
  - hostPath:
      path: /etc/kubernetes/pki
      type: DirectoryOrCreate
    name: k8s-certs
  - hostPath:
      path: /etc/ssl/certs
      type: DirectoryOrCreate
    name: ca-certs
  - hostPath:
      path: /etc/pki
      type: DirectoryOrCreate
    name: ca-certs-etc-pki
  - hostPath:
      path: /etc/kubernetes/auth.csv
    name: kubernetes-dashboard
status: {}