Merge pull request #2981 from M00nF1sh/alb-ingress

create kep for aws alb ingress controller

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+---
+kep-number: draft-20181127
+title: AWS ALB Ingress Controller
+authors:
+  - "@M00nF1sh"
+owning-sig: sig-aws
+reviewers:
+  - TBD
+  - "@d-nishi"
+approvers:
+  - TBD
+  - "@d-nishi"
+editor: TBD
+creation-date: 2018-11-27
+last-updated: 2018-11-27
+status: provisional
+---
+
+# AWS ALB Ingress Controller
+
+## Table of Contents
+- [Table of Contents](#table-of-contents)
+- [Summary](#summary)
+- [Motivation](#motivation)
+  - [Goals](#goals)
+  - [Non-Goals](#non-goals)
+- [Proposal](#proposal)
+  - [User Stories](#user-stories)
+    - [Expose HTTP[s] API backed by kubernetes services](#expose-https-api-backed-by-kubernetes-services)
+    - [Adjust ALB settings via annotation](#adjust-alb-settings-via-annotation)
+    - [Leverage WAF & Cognito](#leverage-waf--cognito)
+    - [Sharing single ALB among Ingresses across namespace](#sharing-single-alb-among-ingresses-across-namespace)
+- [Graduation Criteria](#graduation-criteria)
+- [Implementation History](#implementation-history)
+
+## Summary
+
+This proposal introduces [AWS ALB Ingress Controller](https://github.com/kubernetes-sigs/aws-alb-ingress-controller/) as Ingress controller for kubernetes cluster on AWS. Which use [Amazon Elastic Load Balancing Application Load Balancer](https://aws.amazon.com/elasticloadbalancing/features/#Details_for_Elastic_Load_Balancing_Products)(ALB) to fulfill [Ingress resources](https://kubernetes.io/docs/concepts/services-networking/ingress/), and provides integration with various AWS services.
+
+## Motivation
+
+In order for the Ingress resource to work, the cluster must have an Ingress controller runnings. However, existing Ingress controllers like [nginx](https://github.com/kubernetes/ingress-nginx/blob/master/README.md) didn't take advantage of native AWS features.
+AWS ALB Ingress Controller aims to enhance Ingress resource on AWS by leveraging rich feature set of ALB, such as host/path based routing, TLS termination, WebSockets, HTTP/2. Also, it will provide close integration with other AWS services such as WAF(web application firewall) and Cognito.
+
+### Goals
+
+* Support running multiple Ingress controllers in cluster
+* Support portable Ingress resource(no annotations)
+* Support leverage feature set of ALB via custom annotations
+* Support integration with WAF
+* Support integration with Cognito
+
+### Non-Goals
+
+* This project does not replacing nginx ingress controller
+
+## Proposal
+
+### User Stories
+
+#### Expose HTTP[s] API backed by kubernetes services
+Developers create an Ingress resources to specify rules for how to routing HTTP[s] traffic to different services.
+AWS ALB Ingress Controller will monitor such Ingress resources and create ALB and other necessary supporting AWS resources to match the Ingress resource specification.
+
+#### Adjust ALB settings via annotation
+Developers specifies custom annotations on their Ingress resource to adjust ALB settings, such as enable deletion protection, enable access logs to specific S3 bucket.
+
+#### Leverage WAF & Cognito
+Developers specifies custom annotations on their Ingress resource to denote WAF and Cognito integrations. Which provides web application firewall and authentication support for their exposed API.
+
+#### Sharing single ALB among Ingresses across namespace
+Developers from different teams create Ingress resources in different namespaces which route traffic to services within their own namespace. However, an single ALB is shared from these Ingresses to expose a single DNS name for customers.
+
+## Graduation Criteria
+
+* AWS ALB Ingress Controller is widely used as Ingress controller for kubernetes clusters on AWS
+
+## Implementation History
+- [community#2841](https://github.com/kubernetes/community/pull/2841) Design proposal
+- [aws-alb-ingress-controller#738](https://github.com/kubernetes-sigs/aws-alb-ingress-controller/pull/738) First stable release: v1.0.0
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