Skip to main content
Version: v2.9 (Preview)

3. Install Rancher

Now that you have a running RKE cluster, you can install Rancher in it. For security reasons all traffic to Rancher must be encrypted with TLS. For this tutorial you are going to automatically issue a self-signed certificate through cert-manager. In a real-world use-case you will likely use Let's Encrypt or provide your own certificate.

Install the Helm CLI

danger

Helm v2 support is deprecated as of the Rancher v2.7 line and will be removed in Rancher v2.9.

Install the Helm CLI on a host where you have a kubeconfig to access your Kubernetes cluster:

curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3
chmod +x get_helm.sh
sudo ./get_helm.sh

Install cert-manager

Add the cert-manager Helm repository:

helm repo add jetstack https://charts.jetstack.io

Create a namespace for cert-manager:

kubectl create namespace cert-manager

Install the CustomResourceDefinitions of cert-manager:

kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/<VERSION>/cert-manager.crds.yaml

And install it with Helm. Note that cert-manager also needs your proxy configured in case it needs to communicate with Let's Encrypt or other external certificate issuers:

note

To see options on how to customize the cert-manager install (including for cases where your cluster uses PodSecurityPolicies), see the cert-manager docs.

helm upgrade --install cert-manager jetstack/cert-manager \
--namespace cert-manager \
--set http_proxy=http://${proxy_host} \
--set https_proxy=http://${proxy_host} \
--set no_proxy=127.0.0.0/8\\,10.0.0.0/8\\,cattle-system.svc\\,172.16.0.0/12\\,192.168.0.0/16\\,.svc\\,.cluster.local

Now you should wait until cert-manager is finished starting up:

kubectl rollout status deployment -n cert-manager cert-manager
kubectl rollout status deployment -n cert-manager cert-manager-webhook

Install Rancher

Next you can install Rancher itself. First, add the Helm repository:

helm repo add rancher-latest https://releases.rancher.com/server-charts/latest

Create a namespace:

kubectl create namespace cattle-system

And install Rancher with Helm. Rancher also needs a proxy configuration so that it can communicate with external application catalogs or retrieve Kubernetes version update metadata:

helm upgrade --install rancher rancher-latest/rancher \
--namespace cattle-system \
--set hostname=rancher.example.com \
--set proxy=http://${proxy_host} \
--set noProxy=127.0.0.0/8\\,10.0.0.0/8\\,cattle-system.svc\\,172.16.0.0/12\\,192.168.0.0/16\\,.svc\\,.cluster.local

After waiting for the deployment to finish:

kubectl rollout status deployment -n cattle-system rancher

You can now navigate to https://rancher.example.com and start using Rancher.

caution

If you don't intend to send telemetry data, opt out telemetry during the initial login. Leaving this active in an air-gapped environment can cause issues if the sockets cannot be opened successfully.

Additional Resources

These resources could be helpful when installing Rancher: