I'm trying to deploy Kubernetes Web UI as described here: https://kubernetes.io/docs/tasks/access-application-cluster/web-ui-dashboard/
My system configuration is as follows:
$ uname -a
Linux debian 4.19.0-6-amd64 #1 SMP Debian 4.19.67-2+deb10u2 (2019-11-11) x86_64 GNU/Linux
$ /usr/bin/qemu-system-x86_64 --version
QEMU emulator version 3.1.0 (Debian 1:3.1+dfsg-8+deb10u3)
Copyright (c) 2003-2018 Fabrice Bellard and the QEMU Project developers
$ minikube version
minikube version: v1.5.2
commit: 792dbf92a1de583fcee76f8791cff12e0c9440ad-dirty
$ kubectl version
Client Version: version.Info{Major:"1", Minor:"16", GitVersion:"v1.16.3", GitCommit:"b3cbbae08ec52a7fc73d334838e18d17e8512749", GitTreeState:"clean", BuildDate:"2019-11-13T11:23:11Z", GoVersion:"go1.12.12", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"16", GitVersion:"v1.16.2", GitCommit:"c97fe5036ef3df2967d086711e6c0c405941e14b", GitTreeState:"clean", BuildDate:"2019-10-15T19:09:08Z", GoVersion:"go1.12.10", Compiler:"gc", Platform:"linux/amd64"}
After starting the minukube cluster minikube start
I created a Service Account and ClusterRoleBinding as described here: https://github.com/kubernetes/dashboard/blob/master/docs/user/access-control/creating-sample-user.md
$ nano dashboard-adminuser.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: admin-user
namespace: kubernetes-dashboard
$ kubectl apply -f dashboard-adminuser.yaml
$ nano dashboard-adminuser.yaml
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
$ kubectl apply -f dashboard-adminuser.yaml
Now I execute:
$ kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta6/aio/deploy/recommended.yaml
or
$ kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/master/aio/deploy/recommended.yaml
and get the following output:
namespace/kubernetes-dashboard configured
serviceaccount/kubernetes-dashboard configured
service/kubernetes-dashboard configured
secret/kubernetes-dashboard-certs configured
secret/kubernetes-dashboard-csrf configured
secret/kubernetes-dashboard-key-holder configured
configmap/kubernetes-dashboard-settings configured
role.rbac.authorization.k8s.io/kubernetes-dashboard configured
clusterrole.rbac.authorization.k8s.io/kubernetes-dashboard configured
rolebinding.rbac.authorization.k8s.io/kubernetes-dashboard configured
deployment.apps/kubernetes-dashboard configured
service/dashboard-metrics-scraper configured
deployment.apps/dashboard-metrics-scraper configured
The ClusterRoleBinding "kubernetes-dashboard" is invalid: roleRef: Invalid value: rbac.RoleRef{APIGroup:"rbac.authorization.k8s.io", Kind:"ClusterRole", Name:"kubernetes-dashboard"}: cannot change roleRef
What happened and how to fix it?
Just reproduced.
1) created namespace, ServiceAccount and ClusterRolebinding
cat dashboard-adminuser.yaml
---
apiVersion: v1
kind: Namespace
metadata:
name: kubernetes-dashboard
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: admin-user
namespace: kubernetes-dashboard
---
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
2) apply it
kubectl apply -f dashboard-adminuser.yaml
namespace/kubernetes-dashboard created
serviceaccount/admin-user created
clusterrolebinding.rbac.authorization.k8s.io/admin-user unchanged
3) Install dashboard
kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta6/aio/deploy/recommended.yaml
namespace/kubernetes-dashboard unchanged
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
deployment.apps/dashboard-metrics-scraper created
The error "cannot change roleRef" was referring to the fact that the ClusterRoleBinding already existed.
Try deleting the existing ClusterRoleBinding kubernetes-dashboard
Run below to delete existing:
kubectl delete clusterrolebinding kubernetes-dashboard
After that try installing again. Let us know if that resolves the issue.
I'm getting this error too, solved by running dashboard through minikube:
minikube dashboard
Output:
Verifying dashboard health ...
Launching proxy ...
Verifying proxy health ...
Opening http://127.0.0.1:34653/api/v1/namespaces/kubernetes-dashboard/services/http:kubernetes-dashboard:/proxy/ in your default browser...
issue is you missed this note :
NOTE: apiVersion of ClusterRoleBinding resource may differ between Kubernetes versions.
Prior to Kubernetes v1.8 the apiVersion was rbac.authorization.k8s.io/v1beta1.
This should solve this problem.
this issue talks about same problem. specifically this comment. talks about
Role bindings are immutable
Cause here is
dashboard-adminuser.yaml
sets roleRef.
and
yaml file you are applying later has roleRef in same namespace.
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kubernetes-dashboard
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: kubernetes-dashboard
subjects:
- kind: ServiceAccount
name: kubernetes-dashboard
namespace: kubernetes-dashboard
Run:
kubectl delete clusterrolebinding kubernetes-dashboard
...AFTER the apply -f command, not before.