为什么不能从外面联系到服务?

Question

我有以下服务，想从 kubernetes 调用外部的服务：

k get services                              
NAME              TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
greeter-service   ClusterIP   10.233.35.214   <none>        3000/TCP   4d9h
helloweb          ClusterIP   10.233.8.173    <none>        3000/TCP   4d9h
kubernetes        ClusterIP   10.233.0.1      <none>        443/TCP    4d13h
movieweb          ClusterIP   10.233.12.155   <none>        3000/TCP   3d9h

迎宾服务是第一个候选人，我想从外面联系。我创建了一个虚拟服务，如下所示：

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: greeter-service
spec:
hosts:
- greeter-service.default.svc.cluster.local
http:
- match:
- uri:
prefix: /greeting
rewrite:
uri: /hello
route:
- destination:
host: greeter-service.default.svc.cluster.local
port:
number: 3000
subset: v2
- route:
- destination:
host: greeter-service.default.svc.cluster.local
port:
number: 3000
subset: v1

然后在部署后：

k get virtualservices                       
NAME              GATEWAYS    HOSTS                                         AGE
greeter-service               [greeter-service.default.svc.cluster.local]   3d2h
helloweb          [gateway]   [helloweb.dev]                                4d5h
movieweb          [gateway]   [movieweb.dev]                                3d9h

如您所见，已创建迎宾服务的虚拟服务。 然后我尝试通过 curl 从外面调用它：

curl -v 172.17.8.180:80/greeting
*   Trying 172.17.8.180...
* TCP_NODELAY set
* Connected to 172.17.8.180 (172.17.8.180) port 80 (#0)
> GET /greeting HTTP/1.1
> Host: 172.17.8.180
> User-Agent: curl/7.58.0
> Accept: */*
> 
< HTTP/1.1 404 Not Found
< date: Wed, 04 Dec 2019 20:34:55 GMT
< server: istio-envoy
< content-length: 0
< 
* Connection #0 to host 172.17.8.180 left intact

入口控制器配置如下：

apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
name: gateway
spec:
selector:
istio: ingressgateway
servers:
- port:
number: 80
name: http
protocol: HTTP
hosts:
- '*'

如您所见，我无法访问该服务。怎么了？

Answer 1

您的查询与主机不匹配。尝试

curl -v -H 'Host: greeter-service.default.svc.cluster.local' 172.17.8.180:80/greeting