haproxy.cfg

global
  nbproc 1
  maxconn 65536
  pidfile /run/haproxy.pid

defaults
  mode http
  balance roundrobin
  option redispatch
  option forwardfor
  monitor-uri /health_check
  timeout connect 5s
  timeout queue 5s
  timeout client 50s
  timeout server 50s
  option httplog
  log 127.0.0.1 local0

frontend http-in
  bind *:80
  capture request  header         X-Forwarded-For      len 500
  capture response header         X-Query-Result       len 100
  timeout client 1h
  capture request header Authorization len 1024
  default_backend boomerang_www

listen stats
  bind *:9000
  timeout client 5s
  mode http
  stats enable  # Enable stats page
  stats hide-version  # Hide HAProxy version
  stats realm Haproxy\ Statistics  # Title text for popup window
  stats uri /monitor
  stats auth user:pass
  stats show-legends

resolvers awsdns
  nameserver dns0 "10.0.0.2:53" # configured at startup
  accepted_payload_size 1280
  hold obsolete 1m
  hold valid 1m

backend boomerang_www
  balance leastconn
  http-check expect status 404 #temporary
  option httpchk GET /health/ping
  option log-health-checks
  stick-table type string len 100 size 3M expire 10m #peers haproxy_peers
  stick on hdr(Authorization)
  #server-template foo 5 "_foo._tcp.${SERVICE_DISCOVERY_DOMAIN_NAME}" check resolvers awsdns resolve-prefer ipv4
  server foo1 "_foo._tcp.${SERVICE_DISCOVERY_DOMAIN_NAME}" check resolvers awsdns resolve-prefer ipv4
  server foo2 "_foo._tcp.${SERVICE_DISCOVERY_DOMAIN_NAME}" check resolvers awsdns resolve-prefer ipv4
  server foo3 "_foo._tcp.${SERVICE_DISCOVERY_DOMAIN_NAME}" check resolvers awsdns resolve-prefer ipv4
  server foo4 "_foo._tcp.${SERVICE_DISCOVERY_DOMAIN_NAME}" check resolvers awsdns resolve-prefer ipv4
  server foo5 "_foo._tcp.${SERVICE_DISCOVERY_DOMAIN_NAME}" check resolvers awsdns resolve-prefer ipv4