Use mod_proxy #22016/02/03

Enable mod_proxy module to configure reverse proxy settings. This example is based on the environment below.

(1) www.srv.world	[10.0.0.31]	- Web Server#1
(2) node01.srv.world	[10.0.0.51]	- Web Server#2

This example set servers that requests to (1)Web server forward to / on (2)webserver.

[1]

mod_proxy is included in apache2 package by default, so it's possible to configure quickly.

root@www:~#

a2enmod proxy proxy_http

root@www:~#

vi /etc/apache2/mods-enabled/proxy.conf

# add into <IfModule mod_proxy **> - </IfModule>

<IfModule mod_proxy.c>
    ProxyRequests Off
    <Proxy *>
        Require all granted
    </Proxy>
    ProxyPass / http://node01.srv.world/
    ProxyPassReverse / http://node01.srv.world/

root@www:~#

/etc/init.d/apache2 restart

* Restarting web server apache2
...done.

Access to frontend server to make sure backend server responses like follows.

[2]

It's possible to configure load balancing settings.

(1) www.srv.world	[10.0.0.31]	- Web Server#1
(2) node01.srv.world	[10.0.0.51]	- Web Server#2
(3) node02.srv.world	[10.0.0.52]	- Web Server#3

This example shows to configure servers that http requests to (1)Webserver are forwarded to (2)Webserver and (3)Webserver.

root@www:~#

a2enmod proxy proxy_http lbmethod_byrequests

root@www:~#

vi /etc/apache2/mods-enabled/proxy.conf

# add into <IfModule mod_proxy **> - </IfModule>

<IfModule mod_proxy.c>
    ProxyRequests Off
    <Proxy *>
        Require all granted
    </Proxy>
    # specify the way of load balancing with "lbmethod". it's also possible to set "bytraffic".
    ProxyPass / balancer://cluster lbmethod=byrequests
    <proxy balancer://cluster>
        BalancerMember http://node01.srv.world/ loadfactor=1
        BalancerMember http://node02.srv.world/ loadfactor=1
    </proxy>

root@www:~#

/etc/init.d/apache2 restart

* Restarting web server apache2
...done.

Access to frontend server to make sure backend servers responses like follows.

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