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Issue Let’s Encrypt certificate using Amazon Route53

This tutorial shows how to issue free SSL certificate from Let’s Encrypt via DNS challenge for domains using Amazon Route53.

This article has been tested with a GKE cluster.

$ kubectl version --short
Client Version: v1.8.8
Server Version: v1.8.8-gke.0

1. Setup Issuer

Go to IAM page and create a user

iam

add-user

access-type

Click on next and select Attach existing policies directly and click on Create Policy. This will take you to a new page.

create-policy

Now click on json and paste this and click Review Policy

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "route53:GetChange",
      "Resource": "arn:aws:route53:::change/*"
    },
    {
      "Effect": "Allow",
      "Action": "route53:ChangeResourceRecordSets",
      "Resource": "arn:aws:route53:::hostedzone/*"
    },
    {
      "Effect": "Allow",
      "Action": "route53:ListHostedZonesByName",
      "Resource": "*"
    }
  ]
}

Name the policy and click Create policy.

review-policy

Now go back to previous add user page, hit the refresh button and attach this policy to this user:

attach-policy

Click on next (tags are optional - you can ignore this) and finish the process. Download the .csv file.

success-user

Create a secret with the Secret Access Key

kubectl create secret generic route53-secret --from-literal=secret-access-key="skjdflk4598sf/dkfj490jdfg/dlfjk59lkj"

Copy Access key ID from this same page and hostedZoneID from the following page:

hosted-zone-id

And put them in issuer.yaml

apiVersion: certmanager.k8s.io/v1alpha1
kind: Issuer
metadata:
  name: letsencrypt-staging-dns
  namespace: default
spec:
  acme:
    server: https://acme-staging-v02.api.letsencrypt.org/directory
    email: [email protected]
    # Name of a secret used to store the ACME account private key
    privateKeySecretRef:
      name: example-issuer-account-key
    solvers:
      - dns01:
          route53:
            accessKeyID: KIR2WO5YWT
            secretAccessKeySecretRef:
              name: route53-secret
              key: secret-access-key
            hostedZoneID: J13B3AB

Then create this issuer by kubectl apply -f issuer.yaml

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 ingress.yaml:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: test-ingress-deploy-k8s-route53-dns
  namespace: default
  annotations:
    kubernetes.io/ingress.class: voyager
    certmanager.k8s.io/issuer: "letsencrypt-staging-dns"
    certmanager.k8s.io/acme-challenge-type: dns01
spec:
  tls:
    - hosts:
        - kiteci-route53-dns.appscode.me
      secretName: kiteci-route53-dns-tls
  rules:
    - host: kiteci-route53-dns.appscode.me
      http:
        paths:
          - backend:
              serviceName: web
              servicePort: 80
            path: /

Then take the EXTERNAL-IP from the corresponding service and add a A-record in AWS Route53:

kubectl get svc
NAME                                          TYPE           CLUSTER-IP     EXTERNAL-IP       PORT(S)                      AGE
voyager-test-ingress-deploy-k8s-route53-dns   LoadBalancer   10.7.248.189   35.225.111.106    443:30713/TCP,80:31137/TCP   21m

a-record

3. Create Certificate

Then create this certificate.yaml

apiVersion: certmanager.k8s.io/v1alpha1
kind: Certificate
metadata:
  name: kiteci-route53-dns
  namespace: default
spec:
  secretName: kiteci-route53-dns-tls
  issuerRef:
    name: letsencrypt-staging-dns
  dnsNames:
    - kiteci-route53-dns.appscode.me

List the certificates and describe that certificate and wait until you see Certificate issued successfully when you describe the certificate.

kubectl get certificates.certmanager.k8s.io --all-namespaces

default        kiteci-route53-dns                 True   kiteci-route53-dns-tls             1m
kubectl describe certificates.certmanager.k8s.io kiteci-route53-dns
...
Events:
  Type    Reason              Age   From          Message
  ----    ------              ----  ----          -------
  Normal  Generated           6s    cert-manager  Generated new private key
  Normal  GenerateSelfSigned  6s    cert-manager  Generated temporary self signed certificate
  Normal  OrderCreated        6s    cert-manager  Created Order resource "kiteci-route53-dns-290497833"
  Normal  OrderComplete       5s    cert-manager  Order "kiteci-route53-dns-290497833" completed successfully
  Normal  CertIssued          5s    cert-manager  Certificate issued successfully

Then visit kiteci-route53-dns.appscode.me from browser and check the certificate that it was issued from let’s encrypt. (For let’s encrypt staging environment, you will see that the certificate was issued by Fake LE Intermediate X1.)