Alibaba Cloud Service Mesh:Enable compression for an ASM ingress gateway

Deploy Nginx in the ACK cluster.

1. Create a file named nginx.yaml with the following content.

   Nginx.yaml

   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 VirtualService and a 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 the target Namespaces, paste the following content into 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 the target Namespaces, paste the following content into 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 compression for the ASM ingress gateway.

1. In the left-side navigation pane, choose ASM Gateways > Ingress Gateway.

2. On the Ingress Gateway page, find ingressgateway and click View YAML in the Actions column.

3. In the Edit dialog box, add the following content, and then click OK.

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

   The following table describes key compression fields. For more information about the compression fields, see Manage an ingress gateway by using the Kubernetes API.

   Parameter	Description
   compression.content_type	A list of content types to compress.
   compression.enabled	Specifies whether to enable compression for the ingress gateway.
   compression.gzip	The memory level for Gzip compression.
   compression.remove_accept_encoding_header	If set to true, the ingress gateway removes the Accept-Encoding header from a client request before forwarding it to the upstream service. If set to false, the ingress gateway preserves the Accept-Encoding header in the client request before forwarding it to the upstream service.

Open your browser's developer tools. This guide uses Google Chrome as an example.

1. In the upper-right corner of Google Chrome, click the icon.

2. Select More tools > Developer tools.

Access the Nginx application.

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

2. On the Clusters page, click the name of your cluster. In the left navigation pane, click Network > Services.

3. On the Services page, set Namespace to istio-system, and find the IP address of the istio-ingressgateway service (port 80) in the External IP column.

4. In your browser's address bar, enter the external IP address of the istio-ingressgateway service.

   You can see that the Content-Encoding in the response is gzip, which indicates that compression is successfully enabled for the ASM ingress gateway. In the Network panel, select any request and check the Response Headers to confirm that they contain content-encoding: gzip. This indicates that the ASM ingress gateway has successfully enabled gzip compression.