example-issuer.yaml

# create secret with custom-ca
apiVersion: cert-manager.io/v1
kind: Issuer
metadata:
  name: selfsigned
  namespace: istio-system
spec:
  ca:
    secretName: custom-ca-example-com
---
# Request a self-signed certificate from our Issuer; this will function as our
# issuing root certificate when we pass it into a CA Issuer.

# It's generally fine to issue root certificates like this one with long lifespans;
# the certificates which istio-csr issues will be much shorter lived.
apiVersion: cert-manager.io/v1
kind: Certificate
metadata:
  name: istio-ca
  namespace: istio-system
spec:
  isCA: true
  duration: 87600h # 10 years
  secretName: istio-ca
  commonName: istio-ca
  privateKey:
    algorithm: ECDSA
    size: 256
  subject:
    organizations:
    - cluster.local
    - cert-manager
  issuerRef:
    name: selfsigned
    kind: Issuer
    group: cert-manager.io
---
# Create a CA issuer using our root. This will be the Issuer which istio-csr will use.
apiVersion: cert-manager.io/v1
kind: Issuer
metadata:
  name: istio-ca
  namespace: istio-system
spec:
  ca:
    secretName: istio-ca