Creating admin user to access Kubernetes dashboard

Kan Rangsan
Mar 13, 2019 · 2 min read

The newly created kubernetes cluster (version 1.13.4) I built cannot use kube admin config to access the dashboard. The error said Not enough data to create auth info structure. This github closed issue explain well enough why it doesn’t work. In this guide, I’ll show how to create simple admin user using Service Account, grant it the admin permission then use the token to access the kubernetes dashboard.

Error when use admin.conf file to log in K8S dashboard
  1. Create Admin Service Account

Create below snippet code to dashboard-adminuser.ymland run the kubectl apply command

dashboard-adminuser.yml
$ kubectl apply -f dashboard-adminuser.yml
serviceaccount/admin-user created

2. Create ClusterRoleBinding

In most case, the cluster-admin role should be already exist in the cluster. We can use it and create only ClusterRoleBinding. Copy below code to admin-role-binding.ymlfile and run kubectl apply command.

admin-role-binding.yml
$ kubectl apply -f admin-role-binding.yml
clusterrolebinding.rbac.authorization.k8s.io/admin-user created

3. Get Token

Now we’re ready to get the token from admin-user by following command.

kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk '{print $1}')

The result will look like this.

Name:         admin-user-token-bmmrdNamespace:    kube-system
Labels: <none>
Annotations: kubernetes.io/service-account.name: admin-user
kubernetes.io/service-account.uid: a164478c-4545-11e9-a69b-0800276c3e95
Type: kubernetes.io/service-account-token
Data
====
ca.crt: 1025 bytes
namespace: 11 bytes
token: <your token will be shown here>

Copy the token value and paste it into form then click sign in. You’ll be able to login with admin permission.

Check out more details about Kubernetes authentication and authorization.

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