EDS Demo for Envoy Proxy (using Flask)

This repository contains only minimum source code to use EDS. Just run python3 main.py!. Of course, don't forget to execute pip3 install flask

1. Run pip3 install flask
2. Run python3 main.py
3. Run Nginx Container

$ docker network create envoy_test
$ docker run -d --name nginx1 --network envoy_test -h nginx1 nginx

4. Register Endpoint resource to the EDS server

$ docker inspect nginx1 | grep IPAddress
            "SecondaryIPAddresses": null,
            "IPAddress": "",
                    "IPAddress": "172.18.0.2",

$ curl -X POST --header 'Content-Type: application/json' --header 'Accept: application/json' -d '{
  "hosts": [
    {
      "ip_address": "172.18.0.2",
      "port": 80,
      "tags": {
        "az": "ap-northeast-2a",
        "canary": false,
        "load_balancing_weight": 50
      }
    }
  ]
}' http://localhost:8080/eds/myservice

5. Confirm that endpoint has been registered.

curl -X POST \
    --header 'Content-Type: application/json' \
    --header 'Accept: application/json' \
    -d '{"resource_names":["myservice"]}' \
    localhost:8080/v2/discovery:endpoints | jq -r

{
  "version_info": "v1",
  "resources": [
    {
      "@type": "type.googleapis.com/envoy.api.v2.ClusterLoadAssignment",
      "cluster_name": "myservice",
      "endpoints": [
        {
          "lb_endpoints": [
            {
              "endpoint": {
                "address": {
                  "socket_address": {
                    "address": "172.18.0.2",
                    "port_value": 80
                  }
                }
              }
            }
          ]
        }
      ]
    }
  ]
}

6. Change EDS Server IP to your Flask server accessible IP (usually host IP)

$ cat envoy.yaml
...
    connect_timeout: 0.25s
    hosts: [{ socket_address: { address: 172.20.10.2, port_value: 8080 }}]

7. RUN Envoy Proxy and Nginx Container

$ docker run -it --network envoy_test --rm -p 80:80 \
  -v $(pwd)/envoy.yaml:/tmp/envoy.yaml envoyproxy/envoy:v1.14.1 envoy -c /tmp/envoy.yaml

8. Send request to Envoy Proxy

$ curl localhost:80