6.9. Creating a route through an Ingress object

Procedure

1. Define an Ingress object in the Red Hat build of MicroShift console or by entering the oc create command:

   YAML Definition of an Ingress

   apiVersion: networking.k8s.io/v1
   kind: Ingress
   metadata:
     name: frontend
     annotations:
       route.openshift.io/termination: "reencrypt" 

   1

   
       route.openshift.io/destination-ca-certificate-secret: secret-ca-cert 

   2

   
   spec:
     rules:
     - host: www.example.com 

   3

   
       http:
         paths:
         - backend:
             service:
               name: frontend
               port:
                 number: 443
           path: /
           pathType: Prefix
     tls:
     - hosts:
       - www.example.com
       secretName: example-com-tls-certificate

   1

   The route.openshift.io/termination annotation can be used to configure the spec.tls.termination field of the Route as Ingress has no field for this. The accepted values are edge, passthrough and reencrypt. All other values are silently ignored. When the annotation value is unset, edge is the default route. The TLS certificate details must be defined in the template file to implement the default edge route.

   3

   When working with an Ingress object, you must specify an explicit hostname, unlike when working with routes. You can use the <host_name>.<cluster_ingress_domain> syntax, for example apps.openshiftdemos.com, to take advantage of the *.<cluster_ingress_domain> wildcard DNS record and serving certificate for the cluster. Otherwise, you must ensure that there is a DNS record for the chosen hostname.

   1. If you specify the passthrough value in the route.openshift.io/termination annotation, set path to '' and pathType to ImplementationSpecific in the spec:

        spec:
          rules:
          - host: www.example.com
            http:
              paths:
              - path: ''
                pathType: ImplementationSpecific
                backend:
                  service:
                    name: frontend
                    port:
                      number: 443

      $ oc apply -f ingress.yaml

   2

   The route.openshift.io/destination-ca-certificate-secret can be used on an Ingress object to define a route with a custom destination certificate (CA). The annotation references a kubernetes secret, secret-ca-cert that will be inserted into the generated route.

   1. To specify a route object with a destination CA from an ingress object, you must create a kubernetes.io/tls or Opaque type secret with a certificate in PEM-encoded format in the data.tls.crt specifier of the secret.

2. List your routes:

   $ oc get routes

   The result includes an autogenerated route whose name starts with frontend-:

   NAME             HOST/PORT         PATH    SERVICES    PORT    TERMINATION          WILDCARD
   frontend-gnztq   www.example.com           frontend    443     reencrypt/Redirect   None

   If you inspect this route, it looks this:

   YAML Definition of an autogenerated route

   apiVersion: route.openshift.io/v1
   kind: Route
   metadata:
     name: frontend-gnztq
     ownerReferences:
     - apiVersion: networking.k8s.io/v1
       controller: true
       kind: Ingress
       name: frontend
       uid: 4e6c59cc-704d-4f44-b390-617d879033b6
   spec:
     host: www.example.com
     path: /
     port:
       targetPort: https
     tls:
       certificate: |
         -----BEGIN CERTIFICATE-----
         [...]
         -----END CERTIFICATE-----
       insecureEdgeTerminationPolicy: Redirect
       key: |
         -----BEGIN RSA PRIVATE KEY-----
         [...]
         -----END RSA PRIVATE KEY-----
       termination: reencrypt
       destinationCACertificate: |
         -----BEGIN CERTIFICATE-----
         [...]
         -----END CERTIFICATE-----
     to:
       kind: Service
       name: frontend