kubernetes：部署仪表板（ui）时出错

Question

I have successfully set up a kubernetes cluster on AWS using kops and the following commands:

$ kops create cluster --name=<my_cluster_name> --state=s3://<my-state-bucket> --zones=eu-west-1a --node-count=2 --node-size=t2.micro --master-size=t2.small --dns-zone=<my-cluster-dns>

$ kops update cluster <my-cluster-name> --yes

The cluster has 1 master and 2 slaves.

I am trying to deploy the dashboard using the following command, as per these guidelines :

$ kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml

1 .

I get the following error:

secret "kubernetes-dashboard-certs" created
serviceaccount "kubernetes-dashboard" created
error: error validating "https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml": error validating data: unknown object type schema.GroupVersionKind{Group:"rbac.authorization.k8s.io", Version:"v1", Kind:"Role"}; if you choose to ignore these errors, turn validation off with --validate=false

2 .

My dashboard is not accessible via https://<my_master_node_public_ip>/ui

Instead, I get the following:

kind    "Status"
apiVersion  "v1"
metadata    {}
status  "Failure"
message "endpoints \"kubernetes-dashboard\" not found"
reason  "NotFound"
details 
name    "kubernetes-dashboard"
kind    "endpoints"
code    404

3 .

After running

kubectl proxy

and trying to access the dashboard via:

http://localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/

as instructed by the relevant guidelines, I have the exact same problem.

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"8", GitVersion:"v1.8.1", GitCommit:"f38e43b221d08850172a9a4ea785a86a3ffa3b3a", GitTreeState:"clean", BuildDate:"2017-10-11T23:27:35Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.11", GitCommit:"b13f2fd682d56eab7a6a2b5a1cab1a3d2c8bdd55", GitTreeState:"clean", BuildDate:"2017-11-25T17:51:39Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}

edit : here is the outcome when turning validation errors off:

$ kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml --validate=false
secret "kubernetes-dashboard-certs" configured
serviceaccount "kubernetes-dashboard" configured
service "kubernetes-dashboard" created
Error from server (BadRequest): error when creating "https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml": Role in version "v1" cannot be handled as a Role: no kind "Role" is registered for version "rbac.authorization.k8s.io/v1"
Error from server (BadRequest): error when creating "https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml": RoleBinding in version "v1" cannot be handled as a RoleBinding: no kind "RoleBinding" is registered for version "rbac.authorization.k8s.io/v1"
Error from server (BadRequest): error when creating "https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml": Deployment in version "v1beta2" cannot be handled as a Deployment: no kind "Deployment" is registered for version "apps/v1beta2"

Answer 1

The problem is that you're provisioning a Kubernetes 1.7 cluster with kops and using a dashboard manifest file for Kubernetes 1.8 so try the following (nuke the current deployment first), then:

$ kops create cluster --kubernetes-version="1.8.1" --name=<my_cluster_name> --state=s3://<my-state-bucket> --zones=eu-west-1a --node-count=2 --node-size=t2.micro --master-size=t2.small --dns-zone=<my-cluster-dns>

As pointed out by pkaramol , alternatively to above you can upgrade kops to 1.8 and it should also work.

Note that in any case, in order to get to the dashboard, do:

$ kubectl proxy

... and then the dashboard should be accessible via http://localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/