cert-manager_ca.yml

---
apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
  name: selfsigned-ca-issuer
spec:
  selfSigned: {}
---
apiVersion: cert-manager.io/v1
kind: Certificate
metadata:
  name: selfsigned-ca
  namespace: cert-manager
spec:
  isCA: true
  commonName: selfsigned-ca
  secretName: root-secret
  privateKey:
    algorithm: ECDSA
    size: 256
  issuerRef:
    name: selfsigned-ca-issuer
    kind: ClusterIssuer
    group: cert-manager.io

下記の投稿むけ。

Tanzu Mission Control Self-Managed 自宅ラボ構築。Part-04 cert-manager のインストール
https://vm.gowatana.jp/entry/2023/08/08/022352