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    Using cert-manager to Issue Free Certificate for DNSPod Domain Name

    Last updated: 2024-12-13 21:12:47
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      Overview

      If you use DNSPod to manage your domain names and want to automatically issue free certificates for domain names in Kubernetes, you can use cert-manager to this end:
      cert-manager supports many DNS providers but not DNSPod. However, it offers a webhook to support more providers, and support for DNSPod is also implemented in the community. This document describes how to use cert-manager and cert-manager-webhook-dnspod to automatically issue free certificates for domain names in DNSPod.

      Basic Knowledge

      Directions

      1. Create a DNSPod key

      Log in to the DNSPod console. In Key Management, create a key and copy the automatically generated ID and Token

      2. Install cert-manager

      Install cert-manager. For more information, please see Using cert-manager to Issue Free Certificates.

      3. Install cert-manager-webhook-dnspod

      Use HELM to install cert-manager-webhook-dnspod. You need to prepare the HELM configuration file. Below is a sample dnspod-webhook-values.yaml:
      groupName: example.your.domain # Enter a custom group name
      
      secrets: # Paste the generated ID and token below
        apiID: "<ID>"
        apiToken: "<Token>"
      
      clusterIssuer:
        enabled: true # Automatically create a ClusterIssuer
        email: your@email.com # Enter your email address
      
      For the complete configuration, please see values.yaml.
      Use HELM for installation:
      git clone --depth 1 https://github.com/qqshfox/cert-manager-webhook-dnspod.git
      helm upgrade --install -n cert-manager -f dnspod-webhook-values.yaml cert-manager-webhook-dnspod ./cert-manager-webhook-dnspod/deploy/cert-manager-webhook-dnspod
      

      4. Create a certificate

      Use the following YAML file to create a Certificate object to issue a free certificate:
      apiVersion: cert-manager.io/v1
      kind: Certificate
      metadata:
        name: example-com-crt
        namespace: istio-system
      spec:
        secretName: example-com-crt-secret # The certificate is stored in this secret
        issuerRef:
          name: cert-manager-webhook-dnspod-cluster-issuer # The automatically generated ClusterIssuer is used here
          kind: ClusterIssuer
          group: cert-manager.io
        dnsNames: # Enter the list of domain names for which to issue certificates. Ensure that all the domain names are managed by DNSPod
        - example.com
        - test.example.com
      
      If the status becomes READY, the certificate is successfully issued:
      $ kubectl -n istio-system get certificates.cert-manager.io
      NAME              READY   SECRET                   AGE
      example-com-crt   True    example-com-crt-secret   25d
      
      If the issuance fails, you can run describe to view the cause:
      kubectl -n istio-system describe certificates.cert-manager.io example-com-crt
      

      5. Use the certificate

      After the certificate is successfully issued, it will be stored in the specified Secret as follows:
      Use in Ingress
      Use in Istio ingress gateway
      apiVersion: networking.k8s.io/v1beta1
      kind: Ingress
      metadata:
        name: test-ingress
        annotations:
          kubernetes.io/ingress.class: nginx
      spec:
        rules:
        - host: test.example.com
          http:
            paths:
            - path: /
              backend:
                serviceName: web
                servicePort: 80
        tls:
          hosts:
          - test.example.com
          secretName: example-com-crt-secret # Reference the certificate secret
      
      apiVersion: networking.istio.io/v1alpha3
      kind: Gateway
      metadata:
        name: example-gw
        namespace: istio-system
      spec:
        selector:
          app: istio-ingressgateway
          istio: ingressgateway
        servers:
        - port:
            number: 80
            name: HTTP-80
            protocol: HTTP
          hosts:
          - example.com
          - test.example.com
          tls:
            httpsRedirect: true # Forcibly redirect HTTP to HTTPS
        - port:
            number: 443
            name: HTTPS-443
            protocol: HTTPS
          hosts:
          - example.com
          - test.example.com
          tls:
            mode: SIMPLE
            credentialName: example-com-crt-secret # Reference the certificate secret
      ---
      apiVersion: networking.istio.io/v1beta1
      kind: VirtualService
      metadata:
        name: example-vs
        namespace: test
      spec:
        gateways:
        - istio-system/example-gw # Bind the forwarding rule to the ingress gateway to open the service to the public network
        hosts:
        - 'test.example.com'
        http:
        - route:
          - destination:
              host: example
              port:
                number: 80
      
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