Argo/apps/templates/cert-manager.yaml

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: cert-manager
  namespace: argo-cd
  finalizers:
    - resources-finalizer.argocd.argoproj.io
spec:
  destination:
    server: https://kubernetes.default.svc
    namespace: cert-manager
  project: default
  source:
    chart: cert-manager
    helm:
      values: |

        prometheus:
          enabled: false

        extraArgs:
          - --enable-certificate-owner-ref=true

    repoURL: https://charts.jetstack.io
    targetRevision: 1.10.1

  syncPolicy:
    automated:
      prune: true
      selfHeal: true

---
apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
  name: roxedus.com-cloudflare
  namespace: cert-manager
spec:
  acme:
    server: https://acme-staging-v02.api.letsencrypt.org/directory
    privateKeySecretRef:
      name: cloudflare-issuer-account-key
    solvers:
    - dns01:
        cloudflare:
          apiTokenSecretRef:
            name: cloudflare-api-token-secret
            key: CLOUDFLARE_API_KEY
      selector:
        dnsNames:
        - 'roxedus.com'
        - '*.roxedus.com'
# ---
# apiVersion: cert-manager.io/v1
# kind: Certificate
# metadata:
#   name: test-roxedus-com
#   namespace: default
# spec:
#   # Secret names are always required.
#   secretName: example-com-tls
#   commonName: test.roxedus.com
#   dnsNames:
#     - test.roxedus.com
#   issuerRef:
#     name: roxedus.com-cloudflare
#     # We can reference ClusterIssuers by changing the kind here.
#     # The default value is Issuer (i.e. a locally namespaced Issuer)
#     kind: ClusterIssuer
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    # add an annotation indicating the issuer to use.
    cert-manager.io/acme-challenge-type: dns01
    cert-manager.io/cluster-issuer: roxedus.com-cloudflare
  name: myingress
  namespace: default
spec:
  rules:
  - host: test.example.com
    http:
      paths:
      - pathType: Prefix
        path: /
        backend:
          service:
            name: myservice
            port:
              number: 80
  tls: # < placing a host in the TLS config will determine what ends up in the cert's subjectAltNames
  - hosts:
    - test.roxedus.com
    secretName: test-roxedus-com-cert # < cert-manager will store the created certificate in this secret.