Centos6 安装pen，实现tcp负载均衡
Centos6 安装pen 实现负载均衡，下面是web安装实例。
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 # control port CONTROL=127.0.0.1:10080 # max connections MAX_CONNECTIONS=256 # sebd X-Forwarded-For header XFORWARDEDFOR=true # Round-Robin mode ROUNDROBIN=true # listenning 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 -w $WEBFILE -x $MAX_CONNECTIONS -p $PID -l $LOGFILE -C $CONTROL -S $BACKEND $PORT $SERVER
RETVAL=$?
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 $?
chmod 755 /etc/rc.d/init.d/pend [root@dlp ~]# /etc/rc.d/init.d/pend start Starting Pend: [ OK ] [root@dlp ~]# chkconfig --add pend [root@dlp ~]# chkconfig pend on |
| [3] | Configure httpd on backend 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 |
| [4] | Make sure all works fine to access to the frontend server from a Client with HTTP like follows. |
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