Helm, the package manager for Kubernetes, is a useful tool to install, upgrade and manage applications on a Kubernetes cluster. We will be using Helm to install and manage JupyterHub on our cluster.
The simplest way to install helm is to run Helm's installer script at a terminal:
curl https://raw.githubusercontent.com/kubernetes/helm/master/scripts/get | bash
Alternative methods for helm installation exist if you prefer to install without using the script.
After installing helm on your machine, initialize helm on your Kubernetes cluster. At the terminal, enter:
kubectl --namespace kube-system create sa tiller kubectl create clusterrolebinding tiller --clusterrole cluster-admin --serviceaccount=kube-system:tiller helm init --service-account tiller
This command only needs to run once per Kubernetes cluster.
You can verify that you have the correct version and that it installed properly by running:
helm version
It should provide output like
Client: &version.Version{SemVer:"v2.4.1", GitCommit:"46d9ea82e2c925186e1fc620a8320ce1314cbb02", GitTreeState:"clean"} Server: &version.Version{SemVer:"v2.4.1", GitCommit:"46d9ea82e2c925186e1fc620a8320ce1314cbb02", GitTreeState:"clean"}
Make sure you have at least version 2.4.1!
Ensure that tiller is secure from access inside the cluster:
kubectl --namespace=kube-system patch deployment tiller-deploy --type=json --patch='[{"op": "add", "path": "/spec/template/spec/containers/0/command", "value": ["/tiller", "--listen=localhost:44134"]}]'
Congratulations. Helm is now set up. The next step is to install JupyterHub <setup-jupyterhub>!