Pound : HTTP Load Balancing
2015/01/31 |
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.
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[1] | Install Pound. |
# install from EPEL [root@dlp ~]# yum --enablerepo=epel -y install Pound
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[2] | Configure Pound. |
[root@dlp ~]# mv /etc/pound.cfg /etc/pound.cfg.org
[root@dlp ~]#
vi /etc/pound.cfg User "pound" Group "pound" # log level (max: 5) LogLevel 3 # specify LogFacility LogFacility local1 # interval of heartbeat - seconds Alive 30 # 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 is 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 /etc/rc.d/init.d/pound start Starting Pound: starting... [ OK ] [root@dlp ~]# chkconfig pound on
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[3] | Change Rsyslog setting to revord logs from Pound. |
[root@dlp ~]#
vi /etc/rsyslog.conf # line 42: change like follows *.info;mail.none;authpriv.none;cron.none ,local1.none /var/log/messageslocal1.* /var/log/pound.log /etc/rc.d/init.d/rsyslog restart |
[4] | Change httpd settings on Backend Web servers to record logs of X-Forwarded-For. |
[root@www ~]#
vi /etc/httpd/conf/httpd.conf # line 497: change LogFormat " \"%{X-Forwarded-For}i\" %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
/etc/rc.d/init.d/httpd restart |
[5] | Make sure all works fine to access to the frontend server from a Client with HTTP like follows. |