Creating sample user

In this guide, we will find out how to create a new user using Service Account mechanism of Kubernetes, grant this user admin permissions and login to Dashboard using bearer token tied to this user.

IMPORTANT: Make sure that you know what you are doing before proceeding. Granting admin privileges to Dashboard's Service Account might be a security risk.

Copy following snippets for ServiceAccount and ClusterRoleBinding to new manifest file like dashboard-adminuser.yamland use kubectl apply -f dashboard-adminuser.yaml to create them.

Create Service Account

We are creating Service Account with name admin-user in namespace kubernetes-dashboard first.

apiVersion: v1

kind: ServiceAccount

metadata:

  name: admin-user

  namespace: kubernetes-dashboard

Create ClusterRoleBinding

In most cases after provisioning our cluster using kops or kubeadm or any other popular tool, the ClusterRole admin-Role already exists in the cluster. We can use it and create only ClusterRoleBinding for our ServiceAccount.

NOTE: apiVersion of ClusterRoleBinding resource may differ between Kubernetes versions. Prior to Kubernetes v1.8the apiVersion was rbac.authorization.k8s.io/v1beta1.

apiVersion: rbac.authorization.k8s.io/v1

kind: ClusterRoleBinding

metadata:

  name: admin-user

roleRef:

  apiGroup: rbac.authorization.k8s.io

  kind: ClusterRole

  name: cluster-admin

subjects:

- kind: ServiceAccount

  name: admin-user

  namespace: kubernetes-dashboard

Bearer Token

Now we need to find token we can use to log in. Execute following command:

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

It should print something like:

Name:         admin-user-token-v57nw

Namespace:    kubernetes-dashboard

Labels:       <none>

Annotations:  kubernetes.io/service-account.name: admin-user

              kubernetes.io/service-account.uid: 0303243c-4040-4a58-8a47-849ee9ba79c1

Type:  kubernetes.io/service-account-token

Data

====

ca.crt:     1066 bytes

namespace:  20 bytes

token:      eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.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.Z2JrQlitASVwWbc-s6deLRFVk5DWD3P_vjUFXsqVSY10pbjFLG4njoZwh8p3tLxnX_VBsr7_6bwxhWSYChp9hwxznemD5x5HLtjb16kI9Z7yFWLtohzkTwuFbqmQaMoget_nYcQBUC5fDmBHRfFvNKePh_vSSb2h_aYXa8GV5AcfPQpY7r461itme1EXHQJqv-SN-zUnguDguCTjD80pFZ_CmnSE1z9QdMHPB8hoB4V68gtswR1VLa6mSYdgPwCHauuOobojALSaMc3RH7MmFUumAgguhqAkX3Omqd3rJbYOMRuMjhANqd08piDC3aIabINX6gP5-Tuuw2svnV6NYQ

Now copy the token and paste it into Enter token field on login screen.

Click Sign in button and that's it. You are now logged in as an admin.

In order to find out more about how to grant/deny permissions in Kubernetes read official authentication & authorizationdocumentation.

巴特西

kubernetes/dashboard Creating sample user

Creating sample user

Create Service Account

Create ClusterRoleBinding

Bearer Token

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