global
  stats socket /run/haproxy/admin.sock mode 660 level admin

defaults
  mode http
  timeout connect 5s
  timeout client 30s
  timeout server 30s
  default-server inter 5s fall 3 rise 2

frontend fe_http
  bind :80
  use_backend %[str(active),map(/etc/haproxy/maps/bluegreen.map,backend_blue)]

backend backend_blue
  option httpchk GET /healthz
  http-check expect status 200
  server blue1 10.10.10.11:8080 check
  server blue2 10.10.10.12:8080 check

backend backend_green
  option httpchk GET /healthz
  http-check expect status 200
  server green1 10.10.20.11:8080 check
  server green2 10.10.20.12:8080 check