Kong学习(strip_path使用)

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kong中的strip_path用于是否将请求中的url中path前缀进行剥离，在kong controller的不同版本中, 使用方法不同

在1.x的版本中, strip_path需要使用kongingress进行指定

而在2.x中, 直接在ingress中指定annotataion即可

这里主要以2.x的新版本来实践一番

strip_path

部署echoserver服务

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$ kubectl create namespace echo
namespace/echo created
$ kubectl apply -n echo -f https://bit.ly/echo-service
service/echo created
deployment.apps/echo created

这里为了体现strip_path的功能, 分别部署echo1,echo2两个deploy、svc

部署ingress

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echo '
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    konghq.com/strip-path: "true" # 打开路径前缀strip.
  name: my-app
  namespace: echo
spec:
  rules:
  - host: myapp.example.com
    http:
      paths:
      - path: /echo1/
        backend:
          serviceName: echo
          servicePort: 8080
       - path: /echo2/
        backend:
          serviceName: echo
          servicePort: 8080
' | kubectl create -f -

请求

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# PROXY_IP 为kong proxy svc 地址
export PROXY_IP=10.109.157.29
# 分别请求echo1/echo2
# echo1
curl -svX GET http://myapp.example.com/echo1/myapp/foo --resolve myapp.example.com:80:$PROXY_IP
# echo2
curl -svX GET http://myapp.example.com/echo2/myapp/foo --resolve myapp.example.com:80:$PROXY_IP

请求echo2返回:

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Hostname: echo2-786fd5f6f5-tc596

Pod Information:
    node name:    g105e1900156
    pod name:    echo2-786fd5f6f5-tc596
    pod namespace:    echo
    pod IP:    10.244.0.48 # echo2的pod的IP

Server values:
    server_version=nginx: 1.13.3 - lua: 10008

Request Information:
    client_address=::ffff:10.244.0.37
    method=GET
    real path=/myapp/foo # 真正请求到达pod时可以看到请求已经将echo2前缀给strip掉了.
    query=
    request_version=1.1
    request_scheme=http
    request_uri=http://myapp.example.com:8080/myapp/foo

Request Headers:
    accept=*/*
    connection=keep-alive
    host=myapp.example.com
    user-agent=curl/7.47.0
    x-forwarded-for=10.244.0.1
    x-forwarded-host=myapp.example.com
    x-forwarded-port=8000
    x-forwarded-prefix=/echo2/myapp/foo # 这里是真正的请求路径.
    x-forwarded-proto=http
    x-real-ip=10.244.0.1

Request Body:
    -no body in request-

因此可以通过strip_path来实现每个应用使用特定的路径前缀.

在旧版本中，需要这样使用

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apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: "kong-demo"
    configuration.konghq.com: "kongingress-demo"
  name: demo-ingress
spec:
  rules:
  - http:
      paths:
      - backend:
          serviceName: test-service
          servicePort: 80
        path: /
---
apiVersion: configuration.konghq.com/v1
kind: KongIngress
metadata:
  name: kongingress-demo
route:
  protocols:
  - http
  - https
  strip_path: false  # 在这里开始strip_path,然后在ingress上绑定kongingress

参考文章: