K
Q

cert-manager: no configured challenge solvers can be used for this challenge

7/2/2021

I followed this instruction to set up a cert manager on my EKS cluster https://cert-manager.io/docs/tutorials/acme/ingress/.

here is my ingress

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: test
  annotations:
    kubernetes.io/ingress.class: "nginx"
    cert-manager.io/issuer: "letsencrypt-staging"
spec:
  tls:
  - hosts:
      - '*.test.com'
    secretName: test-tls
  rules:
    - http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: test-service
                port:
                  number: 80

Here is the issuer. I just copied the config from the instruction

apiVersion: cert-manager.io/v1
kind: Issuer
metadata:
  name: letsencrypt-staging
spec:
  acme:
    server: https://acme-staging-v02.api.letsencrypt.org/directory
    email: info@test.com
    privateKeySecretRef:
      name: letsencrypt-staging
    solvers:
      - http01:
          ingress:
            class: nginx

After deployment, I found the certificate ready state is false

kubectl get certificate
NAME          READY   SECRET        AGE
test-tls   False   test-tls   2m45s

Then I followed this to troubleshoot https://cert-manager.io/docs/faq/troubleshooting/

I ran kubectl describe certificaterequest <request name>, found error Waiting on certificate issuance from order test-tls-xxx: "pending"

then ran kubectl describe order test-tls-xxx, found error Warning Solver 20m cert-manager Failed to determine a valid solver configuration for the set of domains on the Order: no configured challenge solvers can be used for this challenge.

Any idea why it couldn't determine a valid solver? how do I test if solver is working?

-- user3908406
amazon-eks
cert-manager
kubernetes
lets-encrypt

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1 Answer

7/2/2021

It's not working due you are using the staging URL in cluster issuer to verify the image.

Please try with the Production URL.

here a simple and proper example of Clusterissuer and ingress YAML (do note you were trying with staging API https://acme-staging-v02.api.letsencrypt.org/directory if possible use the production server address so it works properly with all browsers)

Example:

apiVersion: cert-manager.io/v1alpha2
kind: ClusterIssuer
metadata:
  name: cluster-issuer-name
  namespace: development
spec:
  acme:
    server: https://acme-v02.api.letsencrypt.org/directory
    email: harsh@example.com
    privateKeySecretRef:
      name: secret-name
    solvers:
    - http01:
        ingress:
          class: nginx-class-name
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: nginx-class-name
    cert-manager.io/cluster-issuer: cluster-issuer-name
    nginx.ingress.kubernetes.io/rewrite-target: /
  name: example-ingress
spec:
  rules:
  - host: sub.example.com
    http:
      paths:
      - path: /api
        backend:
          serviceName: service-name
          servicePort: 80
  tls:
  - hosts:
    - sub.example.com
    secretName: secret-name

Note : When you are trying again please try deleting the old objects like ingress, Clusterissuer first.

Issuer vs ClusterIssuer

An Issuer is a namespaced resource, and it is not possible to issue certificates from an Issuer in a different namespace. This means you will need to create an Issuer in each namespace you wish to obtain Certificates in.

If you want to create a single Issuer that can be consumed in multiple namespaces, you should consider creating a ClusterIssuer resource. This is almost identical to the Issuer resource, however is non-namespaced so it can be used to issue Certificates across all namespaces.

Ref : https://cert-manager.io/docs/concepts/issuer/

Wildcard cert

You can use as per requirement, if you are using issuer you can update the ingress annotation line like 

cert-manager.io/issuer: issuer-name

If you are trying to get the wildcard * certificate you won't be able to get it using HTTP auth method 

solvers:
        - http01:
            ingress:
              class: nginx-class-name

instead of this you have to use the DNS-auth method for wildcard cert. 

solvers:
    - dns01:
        cloudDNS:
          project: my-project
          serviceAccountSecretRef:
            name: prod-clouddns-svc-acct-secret
            key: service-account.json

Read more at : https://cert-manager.io/docs/configuration/acme/dns01/

Ref article to get the wildcard cert : https://medium.com/@harsh.manvar111/wild-card-certificate-using-cert-manager-in-kubernetes-3406b042d5a2

-- Harsh Manvar
Source: StackOverflow