Epic - Listener Customization - IP & IPFamily

[brianehlert]

Discussed in #3724

^{Originally posted by brianehlert April 4, 2023}
Project users have asked for an easy way to deploy NIC with non-default and / or custom listeners for http (L7) as well as stream (L4). The stream use case is currently enabled through the GlobalConfiguration custom resource.

It is possible to modify the http listeners today, however the path for customers to do this is complicated and involves modifying the core listener template.

This has been requested for the use cases of:

• customizing dual stack listener behavior (IPFamily)
• binding a listener to a specific interface (IPAddress)

Project users should not have to modify the project code or templates to set non-default listeners.

Suggested modification to GlobalConfiguration to help visualize:
https://github.com/nginxinc/kubernetes-ingress/blob/main/examples/custom-resources/basic-tcp-udp/global-configuration.yaml

apiVersion: k8s.nginx.org/v1beta2
kind: GlobalConfiguration
metadata:
   name: nginx-configuration
   namespace: nginx-ingress
spec:
   listeners:
   - name: http
     port: 80
     protocol: HTTP
     ipfamily: both
   - name: https
     port: 443
     protocol: HTTP
     ssl: true
     ipfamily: both
   - name: http2-grpc
     port: 85
     protocol: HTTP
     ipfamily: both
     http2: true
  - name: dns-tcp
     port: 5353
     protocol: TCP
     ipfamily: both
  - name: port-range
     port: 1494-1496
     protocol: TCP
     ipfamily: ipv6
  - name: accelerated-nic
     port: 1433
     protocol: HTTP
     ipfamily: ipv4
     ip: 10.0.5.56
  - name: proxy
     port: 1434
     protocol: HTTP
     ipfamily: ipv4
     proxy_protocol: true
  - name: proxy
     port: 1434
     protocol: HTTP
     ipfamily: ipv4
     proxy_protocol: true
  - name: mqtt
     port: 1883
     protocol: MQTT
     ipfamily: ipv4
  - name: mqtt-ssl
     port: 8883
     protocol: MQTT
     ipfamily: ipv4
     ssl: true  (?)
  - name: http2-ssl
     port: 9993
     protocol: HTTP2
     ipfamily: ipv4
     ssl: true  (?)
  - name: http3-ssl
     port: 4567
     protocol: HTTP3
     ipfamily: ipv4
     ssl: true  (?)

The listener names would then be referenced following the current pattern in TransportServer
https://github.com/nginxinc/kubernetes-ingress/blob/main/examples/custom-resources/basic-tcp-udp/transport-server-tcp.yaml

This is necessary for many of these use cases because this all happens at the socket / session / listener level with NGINX.