Setup HAProxy Load Balancer on Ubuntu

Today I need to setup HAProxy Load Balance on Ubuntu. I think this month most of my task is on the clustering, load balance and HA. Last 2 weeks, I just finish my cluster for hyper-v. Luckily it's working very well.

Ok let go to the point...

1. Install HAProxy into Ubuntu Server.

# apt-get install haproxy

2. Change the HAProxy configuration. 

# nano etc/haproxy/haproxy.cfg

3. Add following text to file and save it

global

        log 127.0.0.1   daemon debug

        #log 127.0.0.1  local0

        #log 127.0.0.1  local1 notice

        #log loghost    local0 info

        stats socket /tmp/stats

        maxconn 4096

        pidfile /var/run/haproxy.pid

        #chroot /usr/share/haproxy

        #user haproxy

        #group haproxy

        daemon

        #debug

        #quiet

defaults

        log     global

        mode    http

        option  httplog

        option  dontlognull

        retries 3

        option redispatch

        maxconn 3000

        contimeout      5000

        clitimeout      50000

        srvtimeout      50000

listen  webcluster *:80

        mode http

        stats enable

        stats uri /stats           //default using http://web.domain.com/haproxy?stats

        stats auth admin:p@ssw0rd

        balance roundrobin

        option httpchk HEAD / HTTP/1.0

        option forwardfor

        cookie LSW_WEB insert

        option httpclose

        server  192.18.250.22 192.18.250.22:80 check inter 5000 fastinter 1000 fall 1 weight 1

        #server web1 192.18.250.22:80 weight 1 fastinter 5000 rise 2 fall 3

        server  192.18.250.23 192.18.250.23:80 check inter 5000 fastinter 1000 fall 1 weight 1

        #server web2 192.18.250.23:80 weight 1 fastinter 5000 rise 2 fall 3

        option  httpclose               # disable keep-alive

        option  checkcache              # block response if set-cookie & cacheable

        rspidel ^Set-cookie:\ IP=       # do not let this cookie tell our internal IP address

        #errorloc       502     http://192.168.114.58/error502.html

        #errorfile      503     /etc/haproxy/errors/503.http

        errorfile       400     /etc/haproxy/errors/400.http

        errorfile       403     /etc/haproxy/errors/403.http

        errorfile       408     /etc/haproxy/errors/408.http

        errorfile       500     /etc/haproxy/errors/500.http

        errorfile       502     /etc/haproxy/errors/502.http

        errorfile       503     /etc/haproxy/errors/503.http

        errorfile       504     /etc/haproxy/errors/504.http

3. Setting startup parameter for HAProxy set enabled as 1 to start HAproxy

# nano /etc/default/haproxy

4. Start HAProxy form command line

# /etc/init.d/haproxy start

5. Access Web user interface from browser

http://web.domain.com/stats