Quickstart: Kubernetes on Digital Ocean

Quickstart: Kubernetes on Digital Ocean


Surely this can be applied to other managed Kubernetes Services. But this is a quick guide for what to do after you spin up a Kubernetes Cluster with Digital Ocean’s managed offering.

First Steps

Follow Digital Ocean’s quickstart: https://www.digitalocean.com/docs/kubernetes/quickstart/

Download the kubectl config and put it at ~/.kube/config. You can run these commands then open the config to paste the contents:

mkdir -p ~/.kube && \
chmod 770 ~/.kube && \
touch ~/.kube/config && \
chmod 660 ~/.kube/config

Useful tools

Install Helm

Helm makes deployments as easy as they can be with Kubernetes. They have tons of charts.

  1. Create a a YAML file with this content to create RBAC (a service account) objects for Helm:
apiVersion: v1
kind: ServiceAccount
  name: tiller
  namespace: kube-system
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
  name: tiller
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
  - kind: ServiceAccount
    name: tiller
    namespace: kube-system

Note: This is risky in terms of security as it gives Helm the cluster-admin role. You have been warned.

  1. Create and init Helm:
kubectl create -f /path/to/above/yaml/file && \
helm init --service-account tiller --upgrade && \
helm version

You should get output like this (focus on the server bit):

Client: &version.Version{SemVer:"v2.11.0", GitCommit:"2e55dbe1fdb5fdb96b75ff144a339489417b146b", GitTreeState:"clean"}
Server: &version.Version{SemVer:"v2.11.0", GitCommit:"2e55dbe1fdb5fdb96b75ff144a339489417b146b", GitTreeState:"clean"}

Install The Kubernetes Dashboard

  1. Create RBAC objects for the dashboard:
kubectl create serviceaccount --namespace kube-system kubernetes-dashboard && \
kubectl create clusterrolebinding --namespace kube-system kubernetes-dashboard --clusterrole=cluster-admin --serviceaccount=default:kubernetes-dashboard && \
kubectl describe secret $(kubectl get secret | grep cluster-admin-dashboard | awk '{print $1}')

More info here

  1. Use Helm to install the dashboard:
helm install --name kubernetes-dashboard --namespace kube-system stable/kubernetes-dashboard
  1. Verify the release is installed by running:
helm ls

You should see this:

kubernetes-dashboard	1       	Sat Nov  3 02:26:32 2018	DEPLOYED	kubernetes-dashboard-0.7.5	1.10.0     	kube-system
  1. Open a local a proxy tunnel in it’s own tty:
kubectl proxy
  1. Connect to the dashboard in your browser: http://localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/
  2. Obtain a token through the CLI to use to authenticate to the dashboard. Follow instructions here: https://github.com/kubernetes/dashboard/wiki/Access-control#bearer-token The name of the secret is partly dynamically generated. The command I ran to obtain my secret was:
kubectl -n kube-system describe secret kubernetes-dashboard-token-stdb2


Kubewatch is a cool tool that’ll send you alerts about changes in your cluster, through Slack.