Pen : HTTP Load Balancing
Pen : HTTP Load Balancing
2015/06/10
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Install pen which is lightweight simple Load Balancing software.
It is TCP protocol based, so it's possible to balance not only HTTP but SMTP, FTP, LDAP and so on. 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 |
| Pen Server | | Web Server | | Web Server | | Web Server |
+------------+ +--------------+ +--------------+ +--------------+
|
Configure Pen to load balance to Backend#1, Backend#2, Backend#3 web servers.
| |
| [1] | Install Pen. |
# install from EPEL
[root@dlp ~]#
yum --enablerepo=epel -y install pen
|
| [2] | Configure Pen. |
[root@dlp ~]#
vi /etc/pen.conf
# create new
# log file
LOGFILE=/var/log/pen.log
# statics report file
WEBFILE=/var/www/pen/webstats.html
# max connections
MAX_CONNECTIONS=256
# send X-Forwarded-For header
XFORWARDEDFOR=true
# Round-Robin mode
ROUNDROBIN=true
# listening port
PORT=80
# number of backends
BACKEND=3
# define backend servers
SERVER1=10.0.0.51:80 SERVER2=10.0.0.52:80 SERVER2=10.0.0.53:80 #!/bin/bash
# pend: Start/Stop Pend
# chkconfig: - 90 10
# description: Pen is a light weight simple load balancer.
# pidfile: /var/run/pen.pid
. /etc/rc.d/init.d/functions
. /etc/pen.conf
LOCKFILE="/var/lock/subsys/pen"
PID=/var/run/pen.pid
PROG=/usr/bin/pen
PROGNAME=Pend
RETVAL=0
start() {
SERVER=`grep "^SERVER" /etc/pen.conf | cut -d= -f2`
[ $XFORWARDEDFOR = "true" ] && SERVER="-H $SERVER"
[ $ROUNDROBIN = "true" ] && SERVER="-r $SERVER"
[ $SSLCERTS ] && SERVER="-E $SSLCERTS $SERVER"
echo -n $"Starting $PROGNAME: "
daemon $PROG $PORT -w $WEBFILE -x $MAX_CONNECTIONS -p $PID -l $LOGFILE -S $BACKEND $SERVER
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && touch $LOCKFILE
return $RETVAL
}
stop() {
echo -n $"Stopping $PROGNAME: "
killproc $PROG
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && rm -f $PID $LOCKFILE
return $RETVAL
}
case "$1" in
start)
start
;;
stop)
stop
;;
status)
status -p "$PID" -l $PROG $PROGNAME
;;
restart)
stop
start
;;
*)
echo $"Usage: $0 {start|stop|status|restart}"
exit 1
esac
exit $?
[root@dlp ~]#
chmod 755 /etc/rc.d/init.d/pend
[Unit] Description=Pend service After=network.target [Service] Type=oneshot RemainAfterExit=yes ExecStart=/etc/rc.d/init.d/pend start ExecStop=/etc/rc.d/init.d/pend stop [Install] WantedBy=multi-user.target
systemctl start pen
[root@dlp ~]#
systemctl enable pen
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| [3] | Configure httpd on backend servers to record logs of X-Forwarded-For. |
[root@www ~]#
vi /etc/httpd/conf/httpd.conf
# line 196: change
LogFormat "
\"%{X-Forwarded-For}i\"
%l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
systemctl restart httpd
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| [4] | Make sure all works fine to access to the frontend server from a Client with HTTP like follows. |
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