Nacos push xDS with Istio

Istio Guide

It supports CDS and EDS in xDS protocol, and realizes incremental push for EDS and MCP. Users can use Envoy or other XDS protocol-enabled clients to dock with Nacos for service discovery.

Configuration

Server

For distribution packages:

modify nacos.istio.mcp.server.enabled in nacos/conf/application.properties to true.

For source code:

modify nacos.istio.mcp.server.enabled in nacos/distribution/conf/application.properties to true.

For incremental MCP:

modify nacos.istio.server.full in nacos/istio/misc/IstioConfig to false in addition to the above configuration.

Client

In the following example, using Envoy, you can download the Envoy directly or create a mirror and mount the following configuration file.

Config : the port number used can be changed on demand.

node:
  cluster: test-cluster
  id: test-idn

admin:
  address:
    socket_address: { address: 0.0.0.0, port_value: 15000 }

dynamic_resources:
  ads_config:
    api_type: GRPC
    transport_api_version: V3
    grpc_services:
    - envoy_grpc:
        cluster_name: nacos_xds
  cds_config:
    ads: {}
  lds_config:
    path: /etc/envoy/lds.yaml
  # ads: {}

static_resources:
  clusters:
  - type: STATIC
    connect_timeout: 1s
    typed_extension_protocol_options:
      envoy.extensions.upstreams.http.v3.HttpProtocolOptions:
        "@type": type.googleapis.com/envoy.extensions.upstreams.http.v3.HttpProtocolOptions
        explicit_http_config:
          http2_protocol_options: {}
    name: nacos_xds
    load_assignment:
      cluster_name: nacos_xds
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: 127.0.0.1
                port_value: 18848

lds : when Envoy acquires a listening service, it automatically acquires EDS from the server. The listening service can change as needed.

resources:
- "@type": type.googleapis.com/envoy.config.listener.v3.Listener
  name: listener_0
  address:
    socket_address: { address: 0.0.0.0, port_value: 80 }
  # listener_filters:
  # - name: "envoy.filters.listener.tls_inspector"
  filter_chains:
  - filters:
    - name: envoy.filters.network.http_connection_manager
      typed_config:
        "@type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
        stat_prefix: ingress_http
        access_log:
        - name: envoy.access_loggers.stdout
          typed_config:
            "@type": type.googleapis.com/envoy.extensions.access_loggers.stream.v3.StdoutAccessLog
        codec_type: AUTO
        route_config:
          name: local_route
          virtual_hosts:
          - name: local_service
            domains: ["*"]
            routes:
            - match: { prefix: "/" }
              name: test
              route:
                cluster: outbound|8071||service-provider.DEFAULT-GROUP.e77d7925-1c90-4fa9-93cb-83153a099636.nacos
        http_filters:
        - name: envoy.filters.http.router

RUN

Note: each instance of the same service should use the same protocol, EDS default to use incremental push.

Deploy Nacos, deployment reference ;
Modify the configuration in accordance with the above requirements;
Start the server, the detailed start command can be seen in the above deployment reference;
Terminal window
```
bash startup.sh -m standalone -p embedded
```
Start the client.
Terminal window
```
docker start envoy
```

CDS Example

Note: The logs are viewed in nacos/logs/istio-main.log

The service configuration registered in the example is as follows, example reference .

server.port=8071
spring.application.name=service-provider
spring.cloud.nacos.discovery.namespace=e77d7925-1c90-4fa9-93cb-83153a099636
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848

CDS

EDS Example

The service is configured as above.

EDS

Full CDS Example

The services are registered with the following configurations:

#service-provider
server.port=8071
spring.application.name=service-provider
spring.cloud.nacos.discovery.namespace=e77d7925-1c90-4fa9-93cb-83153a099636
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848

#service-consumer
server.port=8080
spring.application.name=service-consumer
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848

In the console, modify only the service-consumer service configuration, push as follows:

Full CDS

Incremental EDS Example

In the console, modify only the service-consumer instance configuration, push as follows:

Incremental EDS