Pound : HTTP Load Balancing2016/06/07

Install Pound which is HTTP/HTTPS Load Balancing software.
This example is based on the environment like follows.

        |
--------+--------------------------------------------------------------------
        |
        +-------------------+--------------------+--------------------+
        |10.0.0.30          |10.0.0.51           |10.0.0.52           |10.0.0.53
 +------+-----+     +-------+------+     +-------+------+     +-------+------+
 |  Frontend  |     |   Backend#1  |     |   Backend#2  |     |   Backend#3  |
 |   Pound    |     |  Web Server  |     |  Web Server  |     |  Web Server  |
 +------------+     +--------------+     +--------------+     +--------------+

	Configure Pound to load balance to Backend#1, Backend#2, Backend#3 web servers.
[1]	Install Pound.

root@dlp:~#

apt-get -y install pound

[2]	Configure Pound.

root@dlp:~#

mv /etc/pound/pound.cfg /etc/pound/pound.cfg.org

root@dlp:~#

vi /etc/pound/pound.cfg

User "www-data"
Group "www-data"

# log level (max: 5)

LogLevel 3

# specify LogFacility

LogFacility local1

# interval of heartbeat - seconds

Alive 30
Control "/var/run/pound/poundctl.socket"

# define frontend

ListenHTTP
    Address 0.0.0.0
    Port 80
End

# define backend

Service
    BackEnd

# backend server's IP address

        Address  10.0.0.51

# backend server's port

        Port     80

# set priority (value of 1-9, max 9)

        Priority 5
    End

    BackEnd
        Address  10.0.0.52
        Port     80
        Priority 5
    End

    BackEnd
        Address  10.0.0.53
        Port     80
        Priority 5
    End
End

root@dlp:~#

sed -i -e "s/^startup=0/startup=1/" /etc/default/pound

root@dlp:~#

systemctl restart pound

[3]	Change Rsyslog setting to revord logs from Pound.

root@dlp:~#

vi /etc/rsyslog.d/50-default.conf

# line 9: change and add like follows

*.*;auth,authpriv.none;local1.none              -/var/log/syslog
local1.*                        /var/log/pound.log

root@dlp:~#

systemctl restart rsyslog

[4]	Change Apache2 settings on Backend Web servers to record logs of X-Forwarded-For.

root@www01:~#

a2enmod remoteip

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

root@www01:~#

vi /etc/apache2/apache2.conf

# line 206-209: change like follows

# specify Pound server's IP address for RemoteIPInternalProxy

RemoteIPHeader X-Forwarded-For
RemoteIPInternalProxy 10.0.0.30

LogFormat "%v:%p

%l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined
LogFormat "

%l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined

root@www01:~#

systemctl restart apache2

[5]	Make sure it works fine to access to the frontend server from a Client with HTTP like follows.

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