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Deploy dashboard on Kubernetes (k8s) v1.22

1. Install kubectl on control server

1.1 Install kubectl

cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg

exclude=kubelet kubeadm kubectl
EOF

yum install -y kubectl --disableexcludes=kubernetes

1.2 Create ~/.kube/config file

mkdir -p ~/.kube
scp echo@master01.k8s:~/.kube/config ~/.kube/config

1.3 Check the kubectl version

kubectl version --short

Output:

Client Version: v1.22.1
Server Version: v1.22.1

2. Deploy dashborad

2.1 Deploy dashborad

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.3.1/aio/deploy/recommended.yaml

Output:

namespace/kubernetes-dashboard created
serviceaccount/kubernetes-dashboard created
service/kubernetes-dashboard created
secret/kubernetes-dashboard-certs created
secret/kubernetes-dashboard-csrf created
secret/kubernetes-dashboard-key-holder created
configmap/kubernetes-dashboard-settings created
role.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrole.rbac.authorization.k8s.io/kubernetes-dashboard created
rolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
deployment.apps/kubernetes-dashboard created
service/dashboard-metrics-scraper created
Warning: spec.template.metadata.annotations[seccomp.security.alpha.kubernetes.io/pod]: deprecated since v1.19; use the "seccompProfile" field instead
deployment.apps/dashboard-metrics-scraper created

2.2 Check the pods & services

kubectl get pod -n kubernetes-dashboard; echo; kubectl get svc -n kubernetes-dashboard

Output:

NAME                                         READY   STATUS    RESTARTS   AGE
dashboard-metrics-scraper-856586f554-tgrhf   1/1     Running   0          5m25s
kubernetes-dashboard-67484c44f6-zzc8m        1/1     Running   0          5m27s

NAME                        TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
dashboard-metrics-scraper   ClusterIP   10.108.194.211   <none>        8000/TCP   5m29s
kubernetes-dashboard        ClusterIP   10.109.50.222    <none>        443/TCP    5m33s

3. Expose dashboard using NodePort

3.1 Reconfigure kubernetes-dashboard servcie

Reconfigure kubernetes-dashboard servcie with fixed nodePort 32700

cat << EOF | kubectl apply -f -
kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  type: NodePort
  ports:
    - port: 443
      targetPort: 8443
      nodePort: 32700
  selector:
    k8s-app: kubernetes-dashboard
EOF

Output:

service/kubernetes-dashboard configured

3.2 Check the services

kubectl get svc -n kubernetes-dashboard

Output:

NAME                        TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)         AGE
dashboard-metrics-scraper   ClusterIP   10.108.194.211   <none>        8000/TCP        141m
kubernetes-dashboard        NodePort    10.109.50.222    <none>        443:32700/TCP   141m

4. Create a ServiceAccount

Create a root service account my-dashboard-sa like this

# Create the service account in the current namespace 
# (we assume default)
kubectl create serviceaccount my-dashboard-sa
# Give that service account root on the cluster
kubectl create clusterrolebinding my-dashboard-sa \
  --clusterrole=cluster-admin \
  --serviceaccount=default:my-dashboard-sa

Get the token in that service account

# Find the secret that was created to hold the token for the SA
tokenname=`kubectl get secrets | grep my-dashboard-sa-token | awk '{print $1}'`
# Show the contents of the secret to extract the token
kubectl describe secret $tokenname | awk '$1=="token:"{print $2}'

5. Access the dashboard in a web browser

Now we can visit the dashboard via https://master01.k8s:32700/ in a web browser.
And put that token in the login screen for authentication.

Reference