Configuring and initializing Helm Tiller

To make use of Helm, you must have a Kubernetes cluster. Ensure you can access your cluster using kubectl.

Helm consists of two parts, the helm client and a tiller server inside Kubernetes.

Note

: If you are not able to run tiller in your cluster, for example on OpenShift, it is possible to use tiller locally and avoid deploying it into the cluster. This should only be used when Tiller cannot be normally deployed.

Initialize Helm and Tiller

Tiller is deployed into the cluster and interacts with the Kubernetes API to deploy your applications. If role based access control (RBAC) is enabled, Tiller will need to be granted permissions to allow it to talk to the Kubernetes API.

If RBAC is not enabled, skip to initalizing Helm.

If you are not sure whether RBAC is enabled in your cluster, or to learn more, read through our RBAC documentation.

Preparing for Helm with RBAC

Helm's Tiller will need to be granted permissions to perform operations. These instructions grant cluster wide permissions, however for more advanced deployments permissions can be restricted to a single namespace. To grant access to the cluster, we will create a new tiller service account and bind it to the cluster-admin role.

Create a file rbac-config.yaml with the following contents:

apiVersion: v1
kind: ServiceAccount
metadata:
  name: tiller
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: tiller
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
  - kind: ServiceAccount
    name: tiller
    namespace: kube-system

Next we need to connect to the cluster and upload the RBAC config.

Upload the RBAC config

Some clusters require authentication to use kubectl to create the Tiller roles.

Upload the RBAC config as an admin user (GKE)

For GKE, you need to grab the admin credentials:

gcloud container clusters describe <cluster-name> --zone <zone> --project <project-id> --format='value(masterAuth.password)'

This command will output the admin password. We need the password to authenticate with kubectl and create the role.

kubectl --username=admin --password=xxxxxxxxxxxxxx create -f rbac-config.yaml

Upload the RBAC config (Other clusters)

For other clusters like Amazon EKS, you can directly upload the RBAC configuration.

kubectl create -f rbac-config.yaml

Initialize Helm

Deploy Helm Tiller with a service account

helm init --service-account tiller

If your cluster previously had Helm/Tiller installed, run the following to ensure that the deployed version of Tiller matches the local Helm version:

helm init --upgrade --service-account tiller

Patching Helm Tiller for EKS

Helm Tiller requires a flag to be enabled to work properly on EKS:

kubectl -n kube-system patch deployment tiller-deploy -p '{"spec": {"template": {"spec": {"automountServiceAccountToken": true}}}}'

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