Alibaba Cloud Service Mesh:Enable data compression for the ingress gateway service of an ASM instance

Deploy an NGINX application in the ACK cluster.

1. Create an nginx.yaml file that contains the following content:

   apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
   kind: Deployment
   metadata:
     name: nginx-deployment
   spec:
     selector:
       matchLabels:
         app: nginx
     replicas: 1
     template:
       metadata:
         labels:
           app: nginx
           sidecarset-injected: "true"
       spec:
         containers:
         - name: nginx
           image: nginx:1.14.2
           ports:
           - containerPort: 80
   ---
   apiVersion: v1
   kind: Service
   metadata:
     name: nginx
   spec:
     ports:
       - name: http
         port: 80
         protocol: TCP
         targetPort: 80
     selector:
       app: nginx
     type: ClusterIP

2. Run the following command to deploy the NGINX application:

   kubectl apply -f nginx.yaml

Create a virtual service and an Istio gateway.

1. Log on to the ASM console. In the left-side navigation pane, choose Service Mesh > Mesh Management.

2. On the Mesh Management page, find the ASM instance that you want to configure. Click the name of the ASM instance or click Manage in the Actions column.

3. On the details page of the ASM instance, choose Traffic Management Center > VirtualService in the left-side navigation pane. On the page that appears, click Create from YAML.

4. On the Create page, select a namespace, copy the following content to the code editor, and then click Create.

   apiVersion: networking.istio.io/v1beta1
   kind: VirtualService
   metadata:
     name: nginx
     namespace: default
   spec:
     gateways:
       - nginx-gateway
     hosts:
       - '*'
     http:
       - match:
           - uri:
               exact: /
         route:
           - destination:
               host: nginx
               port:
                 number: 80

5. On the details page of the ASM instance, choose ASM Gateways > Gateway in the left-side navigation pane. On the page that appears, click Create from YAML.

6. On the Create page, select a namespace, copy the following content to the code editor, and then click Create.

   apiVersion: networking.istio.io/v1beta1
   kind: Gateway
   metadata:
     name: nginx-gateway
     namespace: default
   spec:
     selector:
       istio: ingressgateway
     servers:
       - hosts:
           - '*'
         port:
           name: http
           number: 80
           protocol: HTTP

Enable data compression for the ingress gateway service of the ASM instance.

1. On the details page of the ASM instance, choose ASM Gateways > Ingress Gateway in the left-side navigation pane.

2. On the Ingress Gateway page, find the ingress gateway that you want to use and click YAML.

3. In the Edit dialog box, add the following content to the YAML code and click OK.

   compression:
     content_type:
       - text/html
     enabled: true
     gzip:
       memory_level: 9
     remove_accept_encoding_header: true

   The following table describes some of the fields. For more information about the fields, see Create and manage an ingress gateway by using the Kubernetes API.

   Field	Description
   compression.content_type	The Content-Type headers to be compressed.
   compression.enabled	Specifies whether to enable data compression for the ingress gateway service.
   compression.gzip	The compression format and the amount of memory available for the compression.
   compression.remove_accept_encoding_header	Specifies whether to remove the Accept-Encoding header from an HTTP request that is sent by a client before the ingress gateway forwards the HTTP request to an upstream service. If the parameter is set to true, the Accept-Encoding header is removed from the HTTP request. If the parameter is set to false, the Accept-Encoding header is retained in the HTTP request.

   Sample configuration:

   

Open the debugging page of a browser. In this example, Google Chrome is used.

1. Click the icon in the upper-right corner of Google Chrome.

2. Choose More tools > Developer tools.

Access the NGINX application.

1. Log on to the ACK console. In the left-side navigation pane, click Clusters.

2. On the Clusters page, click the name of the cluster that you want to manage and choose Network > Services in the left-side navigation pane.

3. In the upper part of the Services page, select istio-system from the Namespace drop-down list. Find istio_ingressgateway and view the IP address whose port is 80 in the External IP column.

4. In the DevTools panel, enter the obtained endpoint of the istio_ingressgateway service.

   If the value of the content-encoding parameter is gzip in the Response Headers section, as shown in the following figure, it indicates that data compression is enabled for the ingress gateway service.