Default Secret for TLS Routes

Overview

By default, AKO expects all routes with TLS termination to have key and cert to be specified in the route spec. Sometimes, users may want to apply a common key-cert for multiple routes.

To handle such use cases, AKO supports TLS routes without key/cert specified in the route spec.

Starting with AKO version 1.3.1, you can apply a common key-cert value for multiple routes using the default secret for TLS routes. For example, a wild card secret can be used for all host names in the same subdomain.

Using a Wild Card Secret

In such a scenario, a common key-cert value can be specified in a secret that can be used for TLS routes that do not have a key-cert value specified in the route spec.

To use the wild card secret,

1. Create a secret with name router-certs-default in the same namespace where the AKO pod is running (avi-system). Ensure that the secret has a tls.crt and tls.key fields in its data section.

   An example of the default secret is given below:
   

   
    apiVersion: v1
    kind: Secret
    metadata:
      name: router-certs-default
      namespace: avi-system
    type: kubernetes.io/tls
    data:
      tls.crt: 
        -----BEGIN PRIVATE KEY-----
        [...]
        -----END PRIVATE KEY-----
      tls.key:
        -----BEGIN CERTIFICATE-----
        [...]
        -----END CERTIFICATE-----
    

2. After creating the secret, we can add a secure route without without key or cert in the spec.
   

   For example,
   

   
    apiVersion: v1
    kind: Route
    metadata:
      name: secure-route-no-cert
    spec:
      host: secure-no-cert.avi.internal
      to:
        kind: Service
        name: avisvc
      tls:
        termination: edge
     

AKO uses the default secret to fetch the key and cert values for processing all such routes.

Notes:

• For TLS routes with termination type re-encrypt, the value of the destination CA has to be specified in the route spec itself.
• The CA certificate can not be specified as a part of the default secret.
• The field router-certs-default present in the OpenShift-ingress namespace is not used by AKO. Create router-certs-default in the avi-system namespace.

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