ArgoCD with nginx ingress and cert manager not working - ssl

Question

I am trying to expose ArgoCD using ingress and cert-manager in GKE cluster(version 1.21.5-gke.1302) but the certificate is not issued.
Steps to reproduce:
Install cert-manager applying this yaml
Install nginx ingress-controller with helm running:
helm install my-release nginx-stable/nginx-ingress
Create clusterIssuer applying the following:
apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
name: letsencrypt-cluster-issuer
spec:
acme:
email: example#email.com
server: https://acme-v02.api.letsencrypt.org/directory
privateKeySecretRef:
name: letsencrypt-cluster-issuer-key
solvers:
- http01:
ingress:
class: nginx
Applied ingress using this guide and the file:
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: argocd-server-ingress
namespace: argocd
annotations:
cert-manager.io/cluster-issuer: letsencrypt-prod
kubernetes.io/ingress.class: nginx
kubernetes.io/tls-acme: "true"
nginx.ingress.kubernetes.io/ssl-passthrough: "true"
# If you encounter a redirect loop or are getting a 307 response code
# then you need to force the nginx ingress to connect to the backend using HTTPS.
#
nginx.ingress.kubernetes.io/backend-protocol: "HTTPS"
spec:
rules:
- host: argocd.example.com
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: argocd-server
port:
name: https
tls:
- hosts:
- argocd.example.com
secretName: argocd-secret # do not change, this is provided by Argo CD
Map the ip of ingress-controller to your host name.
Expected behaviour: I was expecting a certificate to be created successfully and have access to the app.
Current status:
Certificate describe gives me this:
Conditions:
Last Transition Time: 2022-01-18T14:10:14Z
Message: Existing issued Secret is not up to date for spec: [spec.dnsNames]
Observed Generation: 3
Reason: SecretMismatch
Status: False
Type: Ready
Last Transition Time: 2022-01-18T14:10:14Z
Message: Issuing certificate as Secret was previously issued by Issuer.cert-manager.io/
Observed Generation: 1
Reason: IncorrectIssuer
Status: True
Type: Issuing
Next Private Key Secret Name: argocd-secret-ccjtv
Not After: 2023-01-18T13:39:24Z
Not Before: 2022-01-18T13:39:24Z
Renewal Time: 2022-09-18T21:39:24Z
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Requested 16m cert-manager Created new CertificateRequest resource "argocd-secret-qm469"
Normal Requested 15m cert-manager Created new CertificateRequest resource "argocd-secret-9ctn4"
Normal Reused 7m19s (x2 over 45h) cert-manager Reusing private key stored in existing Secret resource "argocd-secret"
Finally I can access the provided url by the challenge but status is pending with reason:
Waiting for HTTP-01 challenge propagation: failed to perform self check GET request
Does anyone have any idea what might be wrong? It would be highly appreciated.
Thanks!

Answer 1

Looks like you have a different name for cluster issue in your ingress rule for ArgoCD.
From your example in the ClusterIssuer manifest:
apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
name: letsencrypt-cluster-issuer
And from ingress rule
annotations:
cert-manager.io/cluster-issuer: letsencrypt-prod

Answer 2

I think you need to specify:
apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
name: letsencrypt-cluster-issuer
spec:
acme:
email: example#email.com
server: https://acme-v02.api.letsencrypt.org/directory
privateKeySecretRef:
name: argocd-secret # HERE use secrets created by ArgoCD
solvers:
- http01:
ingress:
class: nginx