How to configure a URI path matching rule - Alibaba Cloud Service Mesh

A service mesh proxy processes a request based on the requested URI and the HTTP rule configured in a virtual service. Virtual services support exact match, prefix match, and regular expression match of URI paths. This topic describes how to configure a URI path matching rule.

Prerequisites

The preparations are completed, and the helloworld and sleep services are deployed. For more information, see Preparations.

Procedure

Check whether the service configurations take effect.
1. Use kubectl to connect to the Container Service for Kubernetes (ACK) cluster based on the information in the kubeconfig file, and then run the following command to enable bash for the sleep service:
```
kubectl exec -it deploy/sleep -- sh
```
2. Run the following command to send a request to the helloworld service:
```
curl helloworld:5000/hello
```
  The expected output is that helloworld-v1 or helloworld-v2 randomly responds to the request.
```
Hello version: v2, instance: helloworld-v2-6b96c5684-4****
Hello version: v1, instance: helloworld-v1-6d77f4c4cf-p****
```

Use the following content to configure a destination rule. For more information, see Manage destination rules.

apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: helloworld
  namespace: default
spec:
  host: helloworld
  subsets:
    - labels:
        version: v1
      name: v1
    - labels:
        version: v2
      name: v2

Use the following content to create a virtual service and add a URI path matching configuration. For more information, see Manage virtual services.

apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: helloworld-vs
  namespace: default
spec:
  hosts:
    - helloworld
  http:
    - match:
        - uri:
            exact: /hello
      route:
        - destination:
            host: helloworld
            subset: v1

Check whether the configurations take effect.
1. Use kubectl to connect to the ACK cluster based on the information in the kubeconfig file, and then run the following command to enable bash for the sleep service:
```
kubectl exec -it deploy/sleep -- sh
```
2. Run the following command to send a request to the /hello path of the helloworld service:
```
curl helloworld:5000/hello
```
  The expected output is always that helloworld-v1 responds to the request.
```
Hello version: v1, instance: helloworld-v1-6d77f4c4cf-p****
```