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+---
+title: 'Kubernetes 内的动态 Ingress'
+layout: blog
+---
+
+<!--
+title: Dynamic Ingress in Kubernetes
+date:  2018-06-07
+Author: Richard Li (Datawire)
+-->
+
+作者: Richard Li (Datawire)
+
+<!--
+Kubernetes makes it easy to deploy applications that consist of many microservices, but one of the key challenges with this type of architecture is dynamically routing ingress traffic to each of these services.  One approach is Ambassador, a Kubernetes-native open source API Gateway built on the Envoy Proxy. Ambassador is designed for dynamic environment where services may come and go frequently.
+Ambassador is configured using Kubernetes annotations. Annotations are used to configure specific mappings from a given Kubernetes service to a particular URL. A mapping can include a number of annotations for configuring a route. Examples include rate limiting, protocol, cross-origin request sharing, traffic shadowing, and routing rules.
+-->
+
+Kubernetes 可以轻松部署由许多微服务组成的应用程序，但这种架构的关键挑战之一是动态地将流量路由到这些服务中的每一个。
+一种方法是使用 [Ambassador](https://www.getambassador.io)，
+一个基于 [Envoy Proxy](https://www.envoyproxy.io) 构建的 Kubernetes 原生开源 API 网关。
+Ambassador 专为动态环境而设计，这类环境中的服务可能被频繁添加或删除。
+
+Ambassador 使用 Kubernetes 注解进行配置。
+注解用于配置从给定 Kubernetes 服务到特定 URL 的具体映射关系。
+每个映射中可以包括多个注解，用于配置路由。
+注解的例子有速率限制、协议、跨源请求共享（CORS）、流量影射和路由规则等。
+
+<!--
+## A Basic Ambassador Example
+Ambassador is typically installed as a Kubernetes deployment, and is also available as a Helm chart. To configure Ambassador, create a Kubernetes service with the Ambassador annotations. Here is an example that configures Ambassador to route requests to /httpbin/ to the public httpbin.org service:
+-->
+
+## 一个简单的 Ambassador 示例
+
+Ambassador 通常作为 Kubernetes Deployment 来安装，也可以作为 Helm Chart 使用。
+配置 Ambassador 时，请使用 Ambassador 注解创建 Kubernetes 服务。
+下面是一个例子，用来配置 Ambassador，将针对 /httpbin/ 的请求路由到公共的 httpbin.org 服务：
+
+```
+apiVersion: v1
+kind: Service
+metadata:
+  name: httpbin
+  annotations:
+    getambassador.io/config: |
+      ---
+      apiVersion: ambassador/v0
+      kind:  Mapping
+      name:  httpbin_mapping
+      prefix: /httpbin/
+      service: httpbin.org:80
+      host_rewrite: httpbin.org
+spec:
+  type: ClusterIP
+  ports:
+    - port: 80
+```
+
+<!--
+A mapping object is created with a prefix of /httpbin/ and a service name of httpbin.org. The host_rewrite annotation specifies that the HTTP host header should be set to httpbin.org.
+-->
+
+例子中创建了一个 Mapping 对象，其 prefix 设置为 /httpbin/，service 名称为 httpbin.org。
+其中的 host_rewrite 注解指定 HTTP 的 host 头部字段应设置为 httpbin.org。
+
+<!--
+## Kubeflow
+Kubeflow provides a simple way to easily deploy machine learning infrastructure on Kubernetes. The Kubeflow team needed a proxy that provided a central point of authentication and routing to the wide range of services used in Kubeflow, many of which are ephemeral in nature.
+<center><i>Kubeflow architecture, pre-Ambassador</center></i>
+-->
+
+## Kubeflow
+
+[Kubeflow](https://github.com/kubeflow/kubeflow) 提供了一种简单的方法，用于在 Kubernetes 上轻松部署机器学习基础设施。
+Kubeflow 团队需要一个代理，为 Kubeflow 中所使用的各种服务提供集中化的认证和路由能力；Kubeflow 中许多服务本质上都是生命期很短的。
+
+<center><i>Kubeflow architecture, pre-Ambassador</center></i>
+
+<!--
+## Service configuration
+With Ambassador, Kubeflow can use a distributed model for configuration. Instead of a central configuration file, Ambassador allows each service to configure its route in Ambassador via Kubernetes annotations. Here is a simplified example configuration:
+-->
+
+## 服务配置
+
+有了 Ambassador，Kubeflow 可以使用分布式模型进行配置。
+Ambassador 不使用集中的配置文件，而是允许每个服务通过 Kubernetes 注解在 Ambassador 中配置其路由。
+下面是一个简化的配置示例：
+
+```
+---
+apiVersion: ambassador/v0
+kind:  Mapping
+name: tfserving-mapping-test-post
+prefix: /models/test/
+rewrite: /model/test/:predict
+method: POST
+service: test.kubeflow:8000
+```
+
+<!--
+In this example, the “test” service uses Ambassador annotations to dynamically configure a route to the service, triggered only when the HTTP method is a POST, and the annotation also specifies a rewrite rule.
+-->
+
+示例中，“test” 服务使用 Ambassador 注解来为服务动态配置路由。
+所配置的路由仅在 HTTP 方法是 POST 时触发；注解中同时还给出了一条重写规则。
+
+<!--
+With Ambassador, Kubeflow manages routing easily with Kubernetes annotations. Kubeflow configures a single ingress object that directs traffic to Ambassador, then creates services with Ambassador annotations as needed to direct traffic  to specific backends. For example, when deploying TensorFlow services,  Kubeflow creates and and annotates a K8s service so that the model will be served at https://<ingress host>/models/<model name>/. Kubeflow can also use the Envoy Proxy to do the actual L7 routing. Using Ambassador, Kubeflow takes advantage of additional routing configuration like URL rewriting and method-based routing.
+If you’re interested in using Ambassador with Kubeflow, the standard Kubeflow install automatically installs and configures Ambassador.
+If you’re interested in using Ambassador as an API Gateway or Kubernetes ingress solution for your non-Kubeflow services, check out the Getting Started with Ambassador guide.
+## Kubeflow and Ambassador
+-->
+
+## Kubeflow 和 Ambassador
+
+通过 Ambassador，Kubeflow 可以使用 Kubernetes 注解轻松管理路由。
+Kubeflow 配置同一个 Ingress 对象，将流量定向到 Ambassador，然后根据需要创建具有 Ambassador 注解的服务，以将流量定向到特定后端。
+例如，在部署 TensorFlow 服务时，Kubeflow 会创建 Kubernetes 服务并为其添加注解，
+以便用户能够在 `https://<ingress主机>/models/<模型名称>/` 处访问到模型本身。
+Kubeflow 还可以使用 Envoy Proxy 来进行实际的 L7 路由。
+通过 Ambassador，Kubeflow 能够更充分地利用 URL 重写和基于方法的路由等额外的路由配置能力。
+
+如果您对在 Kubeflow 中使用 Ambassador 感兴趣，标准的 Kubeflow 安装会自动安装和配置 Ambassador。
+
+如果您有兴趣将 Ambassador 用作 API 网关或 Kubernetes 的 Ingress 解决方案，
+请参阅 [Ambassador 入门指南](https://www.getambassador.io/user-guide/getting-started)。
+