基于标题用户代理的Istio RouteRule不起作用 [英] Istio RouteRule based on headers user-agent doesn't work

问题描述

我在minikube上运行了两个服务，Foo和Bar.当我访问Foo服务时，它向Bar服务发出请求以检索一些数据. Bar服务具有2个版本"1.0"和"2.0". 我已经使用istio设置了默认的RouteRule配置，以将所有请求路由到"1.0":

I have two services running on minikube, Foo and Bar. When I'm accessing the Foo service it makes a request to Bar service to retrieve some data. Bar service have 2 versions "1.0" and "2.0". I have setup the default RouteRule configuration with istio to route all the requests to "1.0":

apiVersion: config.istio.io/v1alpha2
kind: RouteRule
metadata:
  name: bar-default
spec:
  destination:
    name: bar-server
  precedence: 1
  route:
  - labels:
      version: "1.0"

它工作正常，我可以看到所有请求都转发到了"1.0". 现在，我想基于标题添加另一个RouteRule，因此来自Chrome浏览器的所有请求都将转发到"2.0":

It works fine, and I can see that all the requests is forwarded to "1.0". Now I want to add another RouteRule based on the headers, so all the requests from Chrome browser will be forwarded to "2.0":

apiVersion: config.istio.io/v1alpha2
kind: RouteRule
metadata:
  name: bar-v2
spec:
  destination:
    name: bar-server
  precedence: 2
  match:
    request:
      headers:
        user-agent:
          regex: ".*Chrome.*"
  route:
  - labels:
      version: "2.0"

它不起作用.所有请求仍路由到"1.0". 我可以看到RouteRule已创建:

And it doesn't work. All the requests are still routed to "1.0". I can see that the RouteRule is created:

> istioctl get routerules
NAME            KIND                    NAMESPACE
bar-default RouteRule.v1alpha2.config.istio.io  default
bar-v2      RouteRule.v1alpha2.config.istio.io  default

我可以在浏览器的开发人员工具中看到UserAgent标头存在. 如何调试请求以查看为什么不转发给"2.0"?

I can see in the developers tools in browser that the UserAgent header is present. How can I debug the request to see why doesn't it get forwarded to "2.0"?

推荐答案

您的Foo服务可能没有传递从浏览器获取的User-Agent标头.

It could be that your Foo service does not pass the User-Agent header that it gets from the browser.

其他检查将是通过kubectl exec从Foo对Bar执行curl调用，并在将其传递给User-Agent标头时检查版本2.0是否被调用:

Additional check would be to perform a curl call to Bar from Foo by kubectl exec and to check that version 2.0 is called when passing it the User-Agent header:

curl -H "user-agent: ---Chrome---" bar-server

您可以将curl安装在Foo容器中，或者将单独的容器与curl一起使用，例如

You can either install curl in your Foo container, or use a separate container with curl, like this one from Istio samples

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