Create Cluster Issuer

Create a YAML file clusterissuer-letsencrypt.

nano clusterissuer-letsencrypt.yaml

Copy and paste the following YAML contents.

apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
  name: letsencrypt-prod
spec:
  acme:
    email: [e-mail]
    privateKeySecretRef:
      name: letsencrypt-prod
    server: https://acme-v02.api.letsencrypt.org/directory
    solvers:
      - http01:
          ingress:
            class: nginx

After pasting the syntax, save the file by pressing Ctrl + O, then press the Enter key and exit the editor by pressing Ctrl + X. The next step is to apply for a cluster issuer.

kubectl apply -f clusterissuer-letsencrypt.yaml