I have been trying to configure HAProxy to send traffic to different backend servers based on hostnames. I tried using the directions found in How to divert traffic based on hostname using HAProxy?How to divert traffic based on hostname using HAProxy? but unfortunately am not having luck.
I am trying to have it so that if a client goes to bk1.domain.com:80, traffic is sent to the "backend1" backend. Similarly, if someone goes to bk2.domain.com:80, traffic should be sent to the "backend2" backend. All other traffic should be sent to the "default" backend. For clarification, domain.com, bk1.domain.com, bk2.domain.com all resolve to the same IP address.
Unfortunately, when going to bk1.domain.com or bk2.domain.com, the "default" backend is used for all requests. It seems that HAProxy is not recognizing the host headers and as a result is unable to forward requests to the appropriate backend.
Below is the current haproxy.cfg. Any help is appreciated.
global log 127.0.0.1 local0 maxconn 4096 user haproxy group haproxy daemon defaults log global retries 3 option redispatch maxconn 2000 timeout http-request 5s timeout connect 5s timeout client 30s timeout server 10s frontend all_clients bind 0.0.0.0:80 acl back1 hdr(host) -i bk1.domain.com acl back2 hdr(host) -i bk2.domian.com use_backend backend1 if back1 use_backend backend2 if back2 default_backend default backend default balance roundrobin server a1 192.168.0.1:8080 server a2 192.168.0.2:8080 server a3 192.168.0.3:8080 backend backend1 balance roundrobin server b1 10.0.0.1:8080 server b2 10.0.0.2:8080 backend backend2 balance roundrobin server c1 172.16.0.1:8080 server c2 172.16.0.2:8080 
