Using domain instead of IP in haproxy backend - networking

Question

I have 2 virtual host
app.example.com:80 on ip address xxx.xxx.xxx.xxx
app2.example.com:80 on ip address yyy.yyy.yyy.yyy
my haproxy ipaddress is sss.sss.sss.sss
This is haproxy configuration :
global
log 127.0.0.1 local0 notice
maxconn 2000
user haproxy
group haproxy
defaults
log global
mode http
option httplog
option dontlognull
retries 3
option redispatch
timeout connect 5000
timeout client 10000
timeout server 10000
frontend www-http
mode http
bind *:80
default_backend appname
stats enable
stats uri /haproxy?stats
stats auth admin:password
stats show-node
backend appname
balance roundrobin
option httpclose
option forwardfor
server lamp1 app.example.com:80 check
server lamp2 app2.example.com:80 check
When trying to access using haproxy ipaddress, web browser returns xampp dashboard instead of backend content.
How can i make haproxy to redirect to backend content?

Answer 1

I do believe that functionality is now available in 1.6,
http://blog.haproxy.com/2015/10/14/whats-new-in-haproxy-1-6/
what you have configured will simply loadbalance the request between those to instances :
server lamp1 app.example.com:80 check
server lamp2 app2.example.com:80 check
if they are 2 seperate apps rather try:
frontend www-http
mode http
bind sss.sss.sss.sss:80
stats enable
stats uri /haproxy?stats
stats auth admin:password
stats show-node
acl app01 hdr(Host) -i app.example.com
acl app02 hdr(Host) -i app02.example.com
use_backend app01 if app01
use_backend app02 if app02
backend app01
balance roundrobin
option httpclose
option forwardfor
server lamp1 xxx.xxx.xxx.xxx:80 check
backend app02
balance roundrobin
option httpclose
option forwardfor
server lamp2 yyy.yyy.yyy.yyy:80 check
If you now hit your haproxy with app.example.com you will be forwarded to lamp1 and app2.example.com will take you to lamp2
if you want to forward everything to the ip to the backend and dont care for extra matching and mapping then id use a straight listen, instead of a frontend :
listen SOMENAME sss.sss.sss.sss:80
balance leastconn
mode http
server lamp1 xxx.xxx.xxx.xxx:80
server lamp2 yyy.yyy.yyy.yyy:80

Answer 2

If i remember correctly, "default_backend" expects to have "backend" value as an attribute, not "listen".
https://cbonte.github.io/haproxy-dconv/configuration-1.5.html#4.2-default_backend
So i suggest changing to
backend appname
balance roundrobin
option httpclose
option forwardfor
server lamp1 app.example.com:80 check
server lamp2 app2.example.com:80 check