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Version: v2.6

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.

note

These installation instructions assume you are using Helm 3.

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:

note

New in v2.6.4, cert-manager versions 1.6.2 and 1.7.1 are compatible. We recommend v1.7.x because v 1.6.x will reach end-of-life on March 30, 2022.

kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.7.1/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:

helm upgrade --install cert-manager jetstack/cert-manager \
--namespace cert-manager --version v1.7.1 \
--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: