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Issue Let’s Encrypt certificate using HTTP-01 challenge with cert-manager
1. Setup Issuer/ClusterIssuer
Setup a ClusterIssuer (Or Issuer) for your Ingress by applying this clusterissuer.yaml
apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
name: letsencrypt-staging
spec:
acme:
# You must replace this email address with your own.
# Let's Encrypt will use this to contact you about expiring
# certificates, and issues related to your account.
email: user@example.com
server: https://acme-staging-v02.api.letsencrypt.org/directory
privateKeySecretRef:
# Secret resource used to store the account's private key.
name: example-issuer-account-key
# Add a single challenge solver, HTTP01 using nginx
solvers:
- http01:
ingress:
name: test-ingress
Here test-ingress is the name of ingress you’re going to create.
IngressClass or IngressName?
If the ingressClass field is specified, cert-manager will create new Ingress resources in order to route traffic to the ‘acmesolver’ pods, which are responsible for responding to ACME challenge validation requests. If the ingress.name field is specified, cert-manager will edit the named ingress resource in order to solve HTTP01 challenges. Since Voyager allocates a separate external IP for each Ingress resource, use ingress.name mechanism for Voyager.
2. Create Ingress
We are going to use a nginx server as the backend. To deploy nginx server, run the following commands:
kubectl run nginx --image=nginx
kubectl expose deployment nginx --name=web --port=80 --target-port=80
Now create your ingress by applying ingress.yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: test-ingress
namespace: default
annotations:
kubernetes.io/ingress.class: voyager
certmanager.k8s.io/cluster-issuer: "letsencrypt-staging"
certmanager.k8s.io/acme-challenge-type: http01
spec:
tls:
- hosts:
- kiteci.appscode.ninja
secretName: quickstart-kiteci-tls
rules:
- http:
paths:
- backend:
service:
name: web
port:
number: 80
path: /
pathType: Prefix
Then you’ll see that a Certificate crd is created automatically for this ingress
kubectl get certificates.certmanager.k8s.io --all-namespaces
But the certificate is still invalid.
Now take the EXTERNAL-IP from the corresponding service:
kubectl get svc
NAMESPACE NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
default voyager-test-ingress LoadBalancer 10.7.249.7 35.239.22.162 80:31919/TCP,443:32751/TCP 44s
Create an A-record for kiteci-dns.appscode.ninja mapped to 35.239.22.162.
Wait till this is resolved:
dig +short kiteci-dns.appscode.ninja
Describe that certificate and wait until you see Certificate issued successfully when you describe the certificate.
kubectl describe certificates.certmanager.k8s.io quickstart-kiteci-tls
Let’s Encrypt does not support issuing wildcard certificates with HTTP-01 challenges. To issue wildcard certificates, you must use the DNS-01 challenge.
The dnsNames field specifies a list of Subject Alternative Names to be associated with the certificate. If the commonName field is omitted, the first element in the list will be the common name.