Installation instructions can be found here.
Run:
kubectl apply -f https://raw.githubusercontent.com/jetstack/cert-manager/release-0.8/deploy kubectl label namespace cert-manager certmanager.k8s.io/disable-validation="true"
If there is no namespace, then create it.
Add the HELM repository and update:
helm repo add jetstack https://charts.jetstack.io helm repo update
Install Cert Manager using HELM:
helm install \ --name cert-manager \ --namespace cert-manager \ --version v0.8.1 \ jetstack/cert-manager