I just upgraded kubeadm and kubelet to v1.8.0. And install the dashboard following the official document.
$ kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml
After that, I started the dashboard by running
$ kubectl proxy --address="192.168.0.101" -p 8001 --accept-hosts='^*$'
Then fortunately, I was able to access the dashboard thru http://192.168.0.101:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/
I was redirected to a login page like this which I had never met before. It looks like that there are two ways of authentication.
I tried to upload the /etc/kubernetes/admin.conf
as the kubeconfig but got failed. Then I tried to use the token I got from kubeadm token list
to sign in but failed again.
The question is how I can sign in the dashboard. It looks like they added a lot of security mechanism than before. Thanks.
This question is related to
kubernetes
dashboard
You need to follow these steps before the token authentication
Create a Cluster Admin service account
kubectl create serviceaccount dashboard -n default
Add the cluster binding rules to your dashboard account
kubectl create clusterrolebinding dashboard-admin -n default --clusterrole=cluster-admin --serviceaccount=default:dashboard
Get the secret token with this command
kubectl get secret $(kubectl get serviceaccount dashboard -o jsonpath="{.secrets[0].name}") -o jsonpath="{.data.token}" | base64 --decode
Choose token authentication in the Kubernetes dashboard login page
Now you can able to login
add
type: NodePort for the Service
And then run this command:
kubectl apply -f kubernetes-dashboard.yaml
Find the exposed port with the command :
kubectl get services -n kube-system
You should be able to get the dashboard at http://hostname:exposedport/ with no authentication
A self-explanatory simple one-liner to extract token for kubernetes dashboard login.
kubectl describe secret -n kube-system | grep deployment -A 12
Copy the token and paste it on the kubernetes dashboard under token sign in option and you are good to use kubernetes dashboard
If you don't want to grant admin permission to dashboard service account, you can create cluster admin service account.
$ kubectl create serviceaccount cluster-admin-dashboard-sa
$ kubectl create clusterrolebinding cluster-admin-dashboard-sa \
--clusterrole=cluster-admin \
--serviceaccount=default:cluster-admin-dashboard-sa
And then, you can use the token of just created cluster admin service account.
$ kubectl get secret | grep cluster-admin-dashboard-sa
cluster-admin-dashboard-sa-token-6xm8l kubernetes.io/service-account-token 3 18m
$ kubectl describe secret cluster-admin-dashboard-sa-token-6xm8l
I quoted it from giantswarm guide - https://docs.giantswarm.io/guides/install-kubernetes-dashboard/
To get the token in a single oneliner:
kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | awk '/^deployment-controller-token-/{print $1}') | awk '$1=="token:"{print $2}'
This assumes that your ~/.kube/config is present and valid. And also that kubectl config get-contexts
indicates that you are using the correct context (cluster and namespace) for the dashboard you are logging into.
I derived this answer from what I learned from @silverfox's answer. That is a very informative write up. Unfortunately it falls short of telling you how to actually put the information into practice. Maybe I've been doing DevOps too long, but I think in shell. It's much more difficult for me to learn or teach in English.
Here is that oneliner with line breaks and indents for readability:
kubectl -n kube-system describe secret $(
kubectl -n kube-system get secret | \
awk '/^deployment-controller-token-/{print $1}'
) | \
awk '$1=="token:"{print $2}'
There are 4 distinct commands and they get called in this order:
deployment-controller-token-
(which is the pod name)All the previous answers are good to me. But a straight forward answer on my side would come from https://github.com/kubernetes/dashboard/wiki/Creating-sample-user#bearer-token. Just use kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk '{print $1}')
. You will have many values for some keys (Name
, Namespace
, Labels
, ..., token
). The most important is the token
that corresponds to your name. copy that token and paste it in the token box. Hope this helps.
The skip login has been disabled by default due to security issues. https://github.com/kubernetes/dashboard/issues/2672
in your dashboard yaml add this arg
- --enable-skip-login
to get it back
Combining two answers: 49992698 and 47761914 :
# Create service account
kubectl create serviceaccount -n kube-system cluster-admin-dashboard-sa
# Bind ClusterAdmin role to the service account
kubectl create clusterrolebinding -n kube-system cluster-admin-dashboard-sa \
--clusterrole=cluster-admin \
--serviceaccount=kube-system:cluster-admin-dashboard-sa
# Parse the token
TOKEN=$(kubectl describe secret -n kube-system $(kubectl get secret -n kube-system | awk '/^cluster-admin-dashboard-sa-token-/{print $1}') | awk '$1=="token:"{print $2}')
Source: Stackoverflow.com