Apache httpd : Configure mod_proxy#22015/08/03

	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 httpd package and it is enabled by default, so it's possible to configure quickly.

# module is enabled by default

[root@www ~]#

grep "mod_proxy" /etc/httpd/conf.modules.d/00-proxy.conf

LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
.....
LoadModule proxy_http_module modules/mod_proxy_http.so
LoadModule proxy_scgi_module modules/mod_proxy_scgi.so

[root@www ~]#

vi /etc/httpd/conf.d/r_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 ~]#

systemctl restart httpd

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 ~]#

vi /etc/httpd/conf.d/r_proxy.conf

# create new

<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>
</IfModule>

[root@www ~]#

systemctl restart httpd

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

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