Enable non-SNI clients

This topic explains how to enable non-SNI clients for use with Apigee hybrid.

How to configure a non-SNI client

This section explains how to enable support for non-SNI (Server Name Indication) clients in Apigee hybrid. A non-SNI client uses port 443 and is required if you want to integrate hybrid runtime instances with Google Cloud Load Balancing or for clients that do not support SNI.

1. Create an ApigeeRoute custom resource definition (CRD). Be sure that enableNonSniClient is set to true:

   apiVersion: apigee.cloud.google.com/v1alpha1
   kind: ApigeeRoute
   metadata:
     name: ROUTE_NAME
     namespace: APIGEE_NAMESPACE
   spec:
     hostnames:
     - "*"
     ports:
     - number: 443
       protocol: HTTPS
       tls:
         credentialName: CREDENTIAL_NAME
         mode: SIMPLE
         #optional
         minProtocolVersion: TLS_AUTO
     selector:
       app: apigee-ingressgateway
     enableNonSniClient: true

   Where:

   • ROUTE_NAME is the name you give to the custom resource (CR).
   • CREDENTIAL_NAME is the name of a Kubernetes Secret deployed to the cluster that contains TLS credentials for your virtualhost. You can find the credential name with the following kubectl Command:

     kubectl -n APIGEE_NAMESPACE get ApigeeRoutes -o=yaml | grep credentialName

   • hostnames must be set to the wildcard "*".
2. Open your overrides file and make the change described in the next step.
3. For each environment group, add the ApigeeRoute name to the additionalGateways property. For example:

   virtualhosts:
     - name: default
       sslCertPath: ./certs/fullchain.pem
       sslKeyPath: ./certs/privkey.pem
       additionalGateways: ["ROUTE_NAME"]

4. Save the CRD file. For example: ApigeeRoute.yaml
5. Apply the CRD to the cluster:

   kubectl apply -f ApigeeRoute.yaml -n APIGEE_NAMESPACE

6. Apply the change to virtualhosts. If you have set the $ENV_GROUP environment variable in your shell, you can use that in the following commands:

   helm upgrade $ENV_GROUP apigee-virtualhost/ \
     --namespace APIGEE_NAMESPACE \
     --atomic \
     --set envgroup=$ENV_GROUP \
     -f OVERRIDES_FILE.yaml
   

Usage notes

• What happens if the cluster has more than one org?

  Since the ingress is at the cluster level for a given port (443), and there can only be one key/cert pair for the ApigeeRoute CRD, all orgs must share the same key/cert pair.

• What happens if the cluster has more than one environment group? Will it work if the virtual hosts share the same key/cert pair?

  All hostnames across all environment groups must use the same key/cert pair.

• Why are we creating an ApigeeRoute instead of Gateway?

  ApigeeRoutes can be validated by Apigee; however, Gateway (the Istio CRD) cannot be. Technically, even Gateway can work, but we can prevent potential configuration mistakes (through a validation webhook).

• How can I configure non-SNI clients for Apigee?

  If your Apigee instance is exposed through a Google Load Balancer, then the Load Balancer supports non-SNI clients as explained in the Load Balancing documentation. Otherwise, if you have exposed an Apigee instance through an internal PSC endpoint or VPC, by default the Apigee instance supports non-SNI clients.