Lab 2.4 - Setup the Kubernetes UI¶

Important

The following commands need to be run on the master only.

Note

You have two options to install the UI:

Run the included script from the cloned git repo.
Manually run each command.

Both options are included below.

“git” the demo files

Note

These files should be here by default, if NOT run the following commands.

git clone https://github.com/f5devcentral/f5-agility-labs-containers.git ~/agilitydocs

cd ~/agilitydocs/kubernetes

Run the following commands to configure the UI

Note

A script is included in the cloned git repo from the previous step. In the interest of time you can simply use the script.

cd /home/ubuntu/agilitydocs/kubernetes

./create-kube-dashboard

or run through the following steps:

kubectl create serviceaccount kubernetes-dashboard -n kube-system

kubectl create clusterrolebinding kubernetes-dashboard --clusterrole=cluster-admin --serviceaccount=kube-system:kubernetes-dashboard

Warning

These commands create a service account with full admin rights. In a typical deployment this would be overkill.

Create a file called kube-dashboard.yaml with the following content:

# ------------------- Dashboard Deployment ------------------- #

kind: Deployment
apiVersion: apps/v1beta2
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kube-system
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: kubernetes-dashboard
  template:
    metadata:
      labels:
        k8s-app: kubernetes-dashboard
    spec:
      containers:
      - name: kubernetes-dashboard
        image: k8s.gcr.io/kubernetes-dashboard-amd64:v1.10.0
        ports:
        - containerPort: 9090
          protocol: TCP
        args:
          # Uncomment the following line to manually specify Kubernetes API server Host
          # If not specified, Dashboard will attempt to auto discover the API server and connect
          # to it. Uncomment only if the default does not work.
          # - --apiserver-host=http://my-address:port
        volumeMounts:
          # Create on-disk volume to store exec logs
        - mountPath: /tmp
          name: tmp-volume
        livenessProbe:
          httpGet:
            path: /
            port: 9090
          initialDelaySeconds: 30
          timeoutSeconds: 30
      volumes:
      - name: tmp-volume
        emptyDir: {}
      serviceAccountName: kubernetes-dashboard
      # Comment the following tolerations if Dashboard must not be deployed on master
      tolerations:
      - key: node-role.kubernetes.io/master
        effect: NoSchedule

---
# ------------------- Dashboard Service ------------------- #

kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kube-system
spec:
  ports:
  - port: 80
    targetPort: 9090
  type: NodePort
  selector:
    k8s-app: kubernetes-dashboard

Apply Kubernetes manifest file:

kubectl apply -f kube-dashboard.yaml

To access the dashboard, you need to see which port it is listening on. You can find this information with the following command:
```
kubectl describe svc kubernetes-dashboard -n kube-system
```
Note

In our service we are assigned port “30156” (NodePort), you’ll be assigned a different port.

We can now access the dashboard by connecting to the following uri http://10.1.10.21:30156

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