hap

haproxy.cfg

cat haproxy.cfg
#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
    log         127.0.0.1 local2
    pidfile     /var/run/haproxy.pid
    maxconn 2000
    daemon

#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults
    log         global
    option      dontlognull
    option      redispatch
    timeout connect 10000 # default 10 second time out if a backend is not found
    timeout client 300000
    timeout server 300000
    maxconn     60000
    retries     3

    option  httpclose
    option  httplog
    #option  forwardfor
    mode http

frontend http-in
    bind *:80
    mode http
    acl is_green   hdr_dom(host) -i green
    acl is_blue    hdr_dom(host) -i blue
    acl is_red     hdr_dom(host) -i red
    use_backend green if is_green
    use_backend blue  if is_blue
    use_backend blue  if is_red
    #default_backend  red

backend green
    balance roundrobin
    option log-health-checks
    server green green.mynet:80 check

backend blue
    balance roundrobin
    option log-health-checks
    server blue blue:80 check

backend red
    balance roundrobin
    option log-health-checks
    server red red:80 check

listen stats
  bind :81
  mode http
  stats enable
  timeout connect 10s
  timeout client 1m
  timeout server 1m
  stats hide-version
  stats realm Haproxy\ Statistics
  stats uri /
  stats auth stats:SMqzeA5GJIYs

[venkat@admins-MacBook-Pro-2 haproxy $

Makefile

cat Makefile
net:
	docker network create --driver overlay  --attachable mynet
n1:
	docker run -d --net mynet --name green nginx
n2:
	docker run -d --net mynet --name blue nginx
n3:
	docker run -d --net mynet --name red nginx
h:
	docker rm -f hap || echo done
	docker run -d -v $$PWD/haproxy.cfg://usr/local/etc/haproxy/haproxy.cfg -p 80:80 --net mynet --name hap haproxy
	sleep 1
	docker logs hap
j:
	docker run -d -v $$PWD/Makefile:/Makefile --net mynet --name jumpbox  alpine:3.10 tail -f /dev/null

cp:
	docker cp green.html green:/usr/share/nginx/html/index.html
	docker cp blue.html blue:/usr/share/nginx/html/index.html
	docker cp red.html red:/usr/share/nginx/html/index.html
bash:
	docker exec -it jumpbox ash

test:
	curl -v -H "HOST: green.me" localhost
	curl -H "HOST: blue.me" localhost

tr:
	wget -O - --header "Host: red" hap
	curl -H"Host: blue" hap
	curl -H"Host: green" hap