Apache2 : Configure mod_proxy2023/07/04

Enable [mod_proxy] module to configure reverse proxy settings.

This example is based on the environment like follows.

-----------+---------------------------+-----------
           |                           |
           |10.0.0.31                  |10.0.0.51
+----------+-----------+   +-----------+----------+
|   [ www.srv.world ]  |   | [ node01.srv.world ] |
|      Web Server#1    |   |      Web Server#2    |
+----------------------+   +----------------------+

[1]	Configure Apache2.

root@www:~#

vi /etc/apache2/conf-available/revers_proxy.conf

# create new

<IfModule mod_proxy.c>
    ProxyRequests Off
    <Proxy *>
        Require all granted
    </Proxy>
    # backend server and forwarded path
    ProxyPass / http://node01.srv.world/
    ProxyPassReverse / http://node01.srv.world/
</IfModule>

root@www:~#

a2enconf revers_proxy

Enabling conf revers_proxy.
To activate the new configuration, you need to run:
  systemctl reload apache2

root@www:~#

a2enmod proxy proxy_http

Module proxy already enabled
Considering dependency proxy for proxy_http:
Module proxy already enabled
Enabling module proxy_http.
To activate the new configuration, you need to run:
  systemctl restart apache2

root@www:~#

systemctl restart apache2

[2]	Access to frontend server to verify backend server responses like follows.

[3]

It's possible to configure load balancing settings.

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

root@www:~#

vi /etc/apache2/conf-available/revers_proxy.conf

# create new

<IfModule mod_proxy.c>
    ProxyRequests Off
    <Proxy *>
        Require all granted
    </Proxy>
    # specify the way of load balancing with [lbmethod]
    # also possible to set [bytraffic] which means httpd balances requests by traffic
    ProxyPass / balancer://cluster lbmethod=byrequests
    <proxy balancer://cluster>
        BalancerMember http://node01.srv.world/ loadfactor=1
        BalancerMember http://node02.srv.world/ loadfactor=1
    </proxy>
</IfModule>

root@www:~#

a2enconf revers_proxy

Enabling conf revers_proxy.
To activate the new configuration, you need to run:
  systemctl reload apache2

root@www:~#

a2enmod proxy proxy_http proxy_balancer lbmethod_byrequests

Module proxy already enabled
Considering dependency proxy for proxy_http:
Module proxy already enabled
Enabling module proxy_http.
Considering dependency proxy for proxy_balancer:
Module proxy already enabled
Considering dependency alias for proxy_balancer:
Module alias already enabled
Considering dependency slotmem_shm for proxy_balancer:
Module slotmem_shm already enabled
Module proxy_balancer already enabled
Considering dependency proxy_balancer for lbmethod_byrequests:
Considering dependency proxy for proxy_balancer:
Module proxy already enabled
Considering dependency alias for proxy_balancer:
Module alias already enabled
Considering dependency slotmem_shm for proxy_balancer:
Module slotmem_shm already enabled
Module proxy_balancer already enabled
Enabling module lbmethod_byrequests.
To activate the new configuration, you need to run:
  systemctl restart apache2

root@www:~#

systemctl restart apache2

[4]	Access to frontend server to verify backend servers response like follows.

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