httproute-simple-match

HTTP Routing: Simple Match Routing

Demo Overview

All traffic is routed by the front envoy to the service containers. Internally the traffic is routed to the service envoys, then the service envoys route the request to the flask app via the loopback address. In this demo, all traffic is routed to the service envoys like this:

• A request (path /service/blue & port 8000) is routed to service_blue
• A request (path /service/green & port 8000) is routed to service_green
• A request (path /service/red & port 8000) is routed to service_red

Key definition 1 - virtual_hosts in front-envoy.yaml

    virtual_hosts:
    - name: backend
        domains:
        - "*"
        routes:
        - match:
            prefix: "/service/blue"
        route:
            cluster: service_green
        - match:
            prefix: "/service/blue"
        route:
            cluster: service_blue
        - match:
            prefix: "/service/red"
        route:
            cluster: service_red

Key definition 2 - clusters in front-envoy.yaml

  clusters:
  - name: service_blue
    connect_timeout: 0.25s
    type: strict_dns
    lb_policy: round_robin
    http2_protocol_options: {}
    load_assignment:
      cluster_name: service_blue
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: service_blue
                port_value: 80
  - name: service_green
    connect_timeout: 0.25s
    type: strict_dns
    lb_policy: round_robin
    http2_protocol_options: {}
    load_assignment:
      cluster_name: service_green
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: service_green
                port_value: 80
  - name: service_red
    connect_timeout: 0.25s
    type: strict_dns
    lb_policy: round_robin
    http2_protocol_options: {}
    load_assignment:
      cluster_name: service_red
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: service_red
                port_value: 80

Getting Started

git clone https://github.com/yokawasa/envoy-proxy-demos.git
cd envoy-proxy-demos/httproute-simple-match

[NOTICE] Before you run this demo, make sure that all demo containers in previous demo are stopped!

Run the Demo

Build and Run containers

docker-compose up --build -d

# check all services are up
docker-compose ps --service

front-envoy
service_blue
service_green
service_red

# List containers
docker-compose ps

                 Name                               Command               State                            Ports
-----------------------------------------------------------------------------------------------------------------------------------------
httproute-simple-match_front-envoy_1     /docker-entrypoint.sh /bin ...   Up      10000/tcp, 0.0.0.0:8000->8000/tcp, 0.0.0.0:8001->8001/tcp
httproute-simple-match_service_blue_1    /bin/sh -c /usr/local/bin/ ...   Up      10000/tcp, 80/tcp                                        
httproute-simple-match_service_green_1   /bin/sh -c /usr/local/bin/ ...   Up      10000/tcp, 80/tcp                                        
httproute-simple-match_service_red_1     /bin/sh -c /usr/local/bin/ ...   Up      10000/tcp, 80/tcp   

Access each services

Access serivce_blue and check if blue background page is displayed

open http://localhost:8000/service/blue
# or
curl -s -v http://localhost:8000/service/blue

Access serivce_gree and check if gree background page is displayed

open http://localhost:8000/service/green
# or
curl -s -v http://localhost:8000/service/green

Access serivce_red and check if red background page is displayed

open http://localhost:8000/service/green
# or
curl -s -v http://localhost:8000/service/red

Stop & Cleanup

docker-compose down --remove-orphans --rmi all

---

Top