Implement Ingress Controller for Envoy

[louiscryan]

As a proof of concept of the abstraction model we should implement standard Ingress support for Envoy. Should not need any additional configuration artifacts beyond what K8S supports today.

[kyessenov]

That sounds like a good target. I would add that Manager needs to support a regular proxy config, in addition to Istio Proxy, to fully reproduce an ingress controller. There is a difference in proxy topology for the edge proxy.

[elevran]

@louiscryan @kyessenov trying to flesh out the scope, please weigh in so we're on the same page.

This is my understanding of the task, as worded:
Run the manager as an ingress controller to setup Envoy as a standard Ingress controller, only basic k8s Ingress functionality. Later extend to support full Istio functionality.

Since this issue was first written, things have evolved. Is the above still a correct rephrasing of what's needed?

[louiscryan]

Yes, that's correct.

[elevran]

Merged in #71 #177

[zcahana]

Opened a bunch of follow-up issues, so that we can track and prioritize future work on the ingress controller:

• Ingress controller: update ingress resource status #214: Ingress controller: update ingress resource status
• Ingress controller: support ingress class annotation #215: Ingress controller: support ingress class annotation
• Ingress controller: TLS support #216: Ingress controller: TLS support
• Ingress controller: support Istio routing rules #217: Ingress controller: support Istio routing rules
• Ingress controller: integrate with Istio mixer #218: Ingress controller: integrate with Istio mixer
• Ingress controller: evaluate kubernetes GenericController as a base implementation #219: Ingress controller: evaluate kubernetes GenericController as a base implementation
• Ingress controller: start proxy process regardless of existing ingress resources #220: Ingress controller: start proxy process regardless of existing ingress resources

[zcahana]

Also note #151 which tracks some additional issues relating to ingress rules vs. Istio's rules.