Installation and configuration HAproxy on CentOS

Step1)  Linux server has a development environment set up

yum update

yum -y groupinstall 'Development Tools'

Step 2) Download and uncompress haproxy from source code.

wget http://haproxy.1wt.eu/download/1.4/src/haproxy-1.4.23.tar.gz

tar xzf haproxy-1.4.23.tar.gz

 cd haproxy-1.4.23

 make TARGET=linux26

step3) copy the configuration files

mkdir /etc/haproxy

 cp haproxy /usr/sbin/haproxy

step 4) configure haproxy.cfg file according to your need.

vi /etc/haproxy.cfg

*********************

global

      maxconn 4096

      pidfile /var/run/haproxy.pid

      daemon

defaults

        log global

        option dontlognull

        balance leastconn

        clitimeout 60000

        srvtimeout 60000

        contimeout 5000

        retries 3

        option redispatch

listen exchange-http 10.10.3.156:80

      mode http

      stats enable

      stats uri /haproxy-stats

      balance source

      option forwardfor

      server cas1 10.10.3.145:80 check port 80 inter 20 rise 1 fall 1

      server cas2 10.10.3.146:80 check port 80 inter 20 rise 1 fall 1 backup

listen exchange-https-tr 10.10.3.156:444

        mode tcp

        balance source

        maxconn 10000

        server webserver1 10.10.3.145:444 check port 444 inter 20 rise 1 fall 1

        server webserver2 10.10.3.146:444 check port 444 inter 20 rise 1 fall 1 backup

listen exchange-https 10.10.3.156:443

        mode tcp

        balance source

        maxconn 10000

        server webserver1 10.10.3.145:443 check port 443 inter 20 rise 1 fall 1

        server webserver2 10.10.3.146:443 check port 443 inter 20 rise 1 fall 1 backup

listen exchange-https 10.10.3.156:25

        mode tcp

        balance source

        maxconn 10000

        server webserver1 10.10.3.145:25 check port 25 inter 20 rise 1 fall 1

        server webserver2 10.10.3.146:25 check port 25 inter 20 rise 1 fall 1 backup

Step 5) Start HAproxy as daemon

/usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg –d

Step 6) If all goes well the create a init script for HAproxy

Vi /etc/init.d/haproxy

****************

#!/bin/sh

#

# chkconfig: - 85 15

# description: HA-Proxy is a TCP/HTTP reverse proxy which is particularly suited \

#              for high availability environments.

# processname: haproxy

# config: /etc/haproxy/haproxy.cfg

# pidfile: /var/run/haproxy.pid

# Script Author: Simon Matter <simon.matter@invoca.ch>

# Version: 2004060600

# Source function library.

if [ -f /etc/init.d/functions ]; then

  . /etc/init.d/functions

elif [ -f /etc/rc.d/init.d/functions ] ; then

  . /etc/rc.d/init.d/functions

else

  exit 0

fi

# Source networking configuration.

. /etc/sysconfig/network

# Check that networking is up.

[ ${NETWORKING} = "no" ] && exit 0

# This is our service name

BASENAME=`basename $0`

if [ -L $0 ]; then

  BASENAME=`find $0 -name $BASENAME -printf %l`

  BASENAME=`basename $BASENAME`

fi

[ -f /etc/$BASENAME/$BASENAME.cfg ] || exit 1

RETVAL=0

start() {

  /usr/sbin/$BASENAME -c -q -f /etc/$BASENAME/$BASENAME.cfg

  if [ $? -ne 0 ]; then

    echo "Errors found in configuration file, check it with '$BASENAME check'."

    return 1

  fi

  echo -n "Starting $BASENAME: "

  daemon /usr/sbin/$BASENAME -D -f /etc/$BASENAME/$BASENAME.cfg -p /var/run/$BASENAME.pid

  RETVAL=$?

  echo

  [ $RETVAL -eq 0 ] && touch /var/lock/subsys/$BASENAME

  return $RETVAL

}

stop() {

  echo -n "Shutting down $BASENAME: "

  killproc $BASENAME -USR1

  RETVAL=$?

  echo

  [ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/$BASENAME

  [ $RETVAL -eq 0 ] && rm -f /var/run/$BASENAME.pid

  return $RETVAL

}

restart() {

  /usr/sbin/$BASENAME -c -q -f /etc/$BASENAME/$BASENAME.cfg

  if [ $? -ne 0 ]; then

    echo "Errors found in configuration file, check it with '$BASENAME check'."

    return 1

  fi

  stop

  start

}

reload() {

  /usr/sbin/$BASENAME -c -q -f /etc/$BASENAME/$BASENAME.cfg

  if [ $? -ne 0 ]; then

    echo "Errors found in configuration file, check it with '$BASENAME check'."

    return 1

  fi

  /usr/sbin/$BASENAME -D -f /etc/$BASENAME/$BASENAME.cfg -p /var/run/$BASENAME.pid -sf $(cat /var/run/$BASENAME.pid)

}

check() {

  /usr/sbin/$BASENAME -c -q -V -f /etc/$BASENAME/$BASENAME.cfg

}

rhstatus() {

  status $BASENAME

}

condrestart() {

  [ -e /var/lock/subsys/$BASENAME ] && restart || :

}

# See how we were called.

case "$1" in

  start)

    start

    ;;

  stop)

    stop

    ;;

  restart)

    restart

    ;;

  reload)

    reload

    ;;

  condrestart)

    condrestart

    ;;

  status)

    rhstatus

    ;;

  check)

    check

    ;;

  *)

    echo $"Usage: $BASENAME {start|stop|restart|reload|condrestart|status|check}"

    exit 1

esac

exit $?

chmod 755 /etc/init.d/haproxy

service haproxy restart

chkconfig haproxy on