HAProxy, health checking multiple servers with different host names

haproxy

I need to load balance between multiple running servers with different host names. I cannot set-up the same virtual host on each one.

Is it possible to have only one listen configuration with multiple server and make the Health Checks apply the http-send-name-header Host directive? I am using HAProxy 1.5.

I came up with this working haproxy.cfg, as you can see, I had to set a different hostname for each health check as the health check ignores the http-send-name-header Host. I would have preferred to use variables or other methods and keep things more concise.

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
    stats enable
    stats uri /haproxy?stats
    stats refresh 5s
    balance roundrobin
    option httpclose

listen inbound :80    
    option httpchk HEAD / HTTP/1.1\r\n
    server instance1 127.0.0.101 check inter 3000 fall 1 rise 1
    server instance2 127.0.0.102 check inter 3000 fall 1 rise 1

listen instance1 127.0.0.101:80
    option forwardfor
    http-send-name-header Host
    option httpchk HEAD / HTTP/1.1\r\nHost:\ www.example.com
    server www.example.com www.example.com:80 check inter 5000 fall 3 rise 2

listen instance2 127.0.0.102:80
    option forwardfor
    http-send-name-header Host
    option httpchk HEAD / HTTP/1.1\r\nHost:\ www.bing.com
    server www.bing.com www.bing.com:80 check inter 5000 fall 3 rise 2

Best Answer

defaults
log global
retries 2
timeout connect 3000
timeout server 5000
timeout client 5000

listen any-name-1
bind IP-Address:port
mode tcp or http
option user-check user haproxy_check
balance roundrobin
server hostname IpAddress:port check
server hostname  IpAddress:port check
listen any-name-2
bind IP-Address:port
mode tcp or http
option user-check user haproxy_check
balance roundrobin
server hostname IpAddress:port check
server hostanme  IpAddress:port check

listen any-name-3
bind IP-Address:port
mode tcp or http
option user-check user haproxy_check
balance roundrobin
server hostname IpAddress:port check
server hostname  IpAddress:port check

listen any-name-4
bind IP-Address:port
mode tcp or http
option user-check user haproxy_check
balance roundrobin
server hostname IpAddress:port check
server hostname  IpAddress:port check

listen any-name-5
bind IP-Address:port
mode tcp or http
option user-check user haproxy_check
balance roundrobin
server hostname IpAddress:port check
server hostname  IpAddress:port check

listen haproxyadmin
bind HAproxyServerIP:HaproxyPort
mode http
stats enable
stats uri /haproxy
stats realm Strictly\ Private
stats auth username:password
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