Ubuntu 18.04
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HAProxy : HTTP Load Balancing
2018/12/04
 
Install HAProxy to configure Load Balancing Server.
This example is based on the environment like follows.
-----------+---------------------------+--------------------------+------------
           |                           |                          |
           |10.0.0.30                  |10.0.0.51                 |10.0.0.52
+----------+-----------+   +-----------+----------+   +-----------+----------+
|   [ dlp.srv.world ]  |   | [ node01.srv.world ] |   | [ node02.srv.world ] |
|        HAProxy       |   |      Web Server#1    |   |      Web Server#2    |
+----------------------+   +----------------------+   +----------------------+

 
Configure Servers that HTTP connection to HAProxy Server is forwarded to backend Web Servers.
[1] Install HAProxy.
root@dlp:~#
apt -y install haproxy
[2] Configure HAProxy.
root@dlp:~#
vi /etc/haproxy/haproxy.cfg
# add to the end
# define frontend (any name is OK for "http-in")
frontend http-in
        # listen 80 port
        bind *:80
        # set default backend
        default_backend    backend_servers
        # send X-Forwarded-For header
        option             forwardfor

# define backend
backend backend_servers
        # balance with roundrobin
        balance            roundrobin
        # define backend servers
        server             node01 10.0.0.51:80 check
        server             node02 10.0.0.52:80 check

root@dlp:~#
systemctl restart haproxy

[3] Change Apache2 settings on Backends to logging X-Forwarded-For header.
root@node01:~#
a2enmod remoteip

Enabling module remoteip.
To activate the new configuration, you need to run:
  service apache2 restart

root@node01:~#
vi /etc/apache2/apache2.conf
# line 212-215: change like follows

# specify HAProxy's Ip address for [RemoteIPInternalProxy]

RemoteIPHeader X-Forwarded-For
RemoteIPInternalProxy 10.0.0.30

LogFormat "%v:%p
%a
%l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined
LogFormat "
%a
%l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined
root@node01:~#
systemctl restart apache2

[4] Verify working normally to access to frontend HAproxy Server.
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