I figured out how add a DigitalOcean Cluster to GitLab.
The steps I took (set up your kubectl to use your DigitalOcean Cluster first):

create a new namespace
kubectl create namespace gitlabkubesandbox
switch to that new namespace
kubectl config set-context $(kubectl config current-context) --namespace=gitlabkubesandbox
create a service account
kubectl create -f - <<EOF
apiVersion: v1
kind: ServiceAccount
metadata:
name: gitlab
EOF
make the new service account cluster admin
kubectl create clusterrolebinding gitlab-cluster-admin-binding --clusterrole=cluster-admin --serviceaccount=gitlabkubesandbox:gitlab
describe the new service account
kubectl describe serviceAccounts gitlab
get the secret
kubectl describe secret [secret name found in the response form above]
copy the token
start the dashboard
kubectl proxy
open the dashboard in your browser
http://localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/
switch to the namespace “gitlabkubesandbox”
go to secrets => the secret from above

Values for GitLab:
Kubernetes cluster name: whatever
API URL: cluster server from the kubeconfig.yml
CA Certificate: ca.crt from the Dashboard
Token: token from the Dashboard
Project namespace: gitlabkubesandbox
Check RBAC-enabled when adding the Cluster to GitLab.

Done!

For installing Helm, described rights was not enough for me. I have to do this:

### http://centosquestions.com/kubernetes-error-namespaces-gitlab-managed-apps-forbidden-user-systemserviceaccountgitlab-managed-appsgitlab-sa-cannot-get-namespaces-namespace-gitlab-managed-apps/
kubectl create clusterrolebinding permissive-binding --clusterrole=cluster-admin --user=admin --user=kubelet --group=system:serviceaccounts

Hey there - would the below two commands help?

# Get server
echo $(kubectl config view | grep server | cut -f 2- -d ":" | tr -d " ")

# Get server token
echo $(kubectl describe secret $(kubectl get secrets | grep default | cut -f1 -d ' ') | grep -E '^token' | cut -f2 -d':' | tr -d '\t')

Just copy what shows in the terminal when you run those. May be applicable to you.

https://kubernetes.io/docs/tasks/administer-cluster/access-cluster-api/#without-kubectl-proxy

Hi John, thanks for your help.

I am using the OD <beta> kubernetes. I managed to enter on the console and when I run the kubectl config view, everything is empty…

I’m sorry but I don’t have too much experience with Kubernetes.

Thanks,
David

I have create a small project under https://devops.ck99.io/ck/gitlab-kubernetes-setup

This contains a summary in a script “setup.sh” with all the steps discussed here.

If you are getting a Kubernetes Error 401 it means your Token is incorrect as it was in my case. Here I was using a token from an API tab in the Dashboard BUT should really create the Token by command line like recommended. After generating a user and a token using kubectl commands and changing the Token the installation of Helm worked perfectly.
Hope it helps!