kubernetes - 如何在Kubernetes入口 Controller 中将请求URI的部分作为自定义 header 传递

Question

我在ingress.yaml中具有以下配置，该配置将具有/ us / default / demoservice / health或/ custom / demoservice / health的uri转发请求到后端demoservice。我想从uri中检索uri的第一部分(即上述示例中的default或custom)，并将其作为自定义 header 传递给上游。

我已经使用自定义 header 部署了入口configmap

X-MyVariable-Path: ${request_uri} 

但这会发送完整的请求uri。如何拆分？

- path: "/(.*?)/(demoservice.*)$"
  backend:
    serviceName: demoservice
    servicePort: 80

Answer 1

我找到了解决方案，对其进行了测试，并且可以正常工作。
您需要做的就是向您的入口对象添加以下注释:

nginx.ingress.kubernetes.io/use-regex: "true"
nginx.ingress.kubernetes.io/configuration-snippet: |  
proxy_set_header X-MyVariable-Path $1;  

$1引用的是path:字段中第一组正则表达式中捕获的内容。

我已使用以下yaml复制了您的方案:

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/configuration-snippet: |
      proxy_set_header  X-MyVariable-Path  $1;
    nginx.ingress.kubernetes.io/use-regex: "true"
  name: foo-bar-ingress
spec:
  rules:
  - http:
      paths:
      - backend:
          serviceName: echo
          servicePort: 80
        path: /(.*?)/(demoservice.*)$
---
apiVersion: v1
kind: Service
metadata:
  labels:
    run: echo
  name: echo
spec:
  ports:
  - port: 80
    targetPort: 80
  selector:
    run: echo
---
apiVersion: v1
kind: Pod
metadata:
  labels:
    run: echo
  name: echo
spec:
  containers:
  - image: mendhak/http-https-echo
    imagePullPolicy: Always
    name: echo

您可以使用curl进行测试:
curl -k https://<your_ip>/default/demoservice/healthz
输出:

 {
  "path": "/default/demoservice/healthz",
  "headers": {
    "host": "192.168.39.129",
    "x-request-id": "dfcc67a80f5b02e6fe6c647c8bf8cdf0",
    "x-real-ip": "192.168.39.1",
    "x-forwarded-for": "192.168.39.1",
    "x-forwarded-host": "192.168.39.129",
    "x-forwarded-port": "443",
    "x-forwarded-proto": "https",
    "x-scheme": "https",
    "x-myvariable-path": "default", # your variable here
    "user-agent": "curl/7.52.1",
    "accept": "*/*"
  },
  "method": "GET",
  "body": "",
  "fresh": false,
  "hostname": "192.168.39.129",
  "ip": "::ffff:172.17.0.4",
  "ips": [],
  "protocol": "http",
  "query": {},
  "subdomains": [],
  "xhr": false,
  "os": {
    "hostname": "echo"
  }
}

希望对您有帮助=)