HAProxy + AWS CloudMap + AWS ECS

Dockerfile

FROM haproxy:2.3
COPY haproxy.cfg /usr/local/etc/haproxy/haproxy.cfg

haproxy.cfg

global
  maxconn 50000
  log stdout local0
  stats socket :9000 mode 660 level admin

defaults
  mode http
  log global
  option httplog
  option forwardfor
  timeout connect 20s
  timeout client  10m
  timeout server  10m

resolvers awsvpc
  nameserver dns1 172.31.0.2:53
  resolve_retries 3
  accepted_payload_size 8192

frontend www-http
    # Redirect HTTP to HTTPS
    bind *:80
    # Adds http header to end of end of the HTTP request
    http-request add-header X-Forwarded-Proto http
    # Sets the default backend to use which is defined below with name 'www-backend'
    default_backend core-backend

backend core-backend
  balance roundrobin
  # "hello" is the name of our service
  # "app-inernal" is the name of our AWS CloudMap private zone
  # "300" is the port of our ECS "hello" task
  server-template web 5 hello.app-internal:3000 check resolvers awsvpc init-addr none