HTTP Load Balancing through LVS

HTTP Load Balancing through LVS

1. Summary

This article does not consider dual-host mutual backup. Http load balancing is achieved through scripts and LVS, and clusters are used in the actual production environment.

2. Installation

1) Prepare the Software Package

Ipvsadm-1.26.tar.gz

Httpd-2.2.23.tar.gz

2) Configure Director Server

A. Check whether the kernel supports the ipvs module of LVS.

# Modprobe-L | grep ipvs

Kernel/NET/Netfilter/S/ip_vs.ko

Kernel/NET/Netfilter/ipvs/ip_vs_rr.ko

Kernel/NET/Netfilter/ipvs/ip_vs_wrr.ko

Kernel/NET/Netfilter/ipvs/ip_vs_lc.ko

Kernel/NET/Netfilter/ipvs/ip_vs_wlc.ko

Kernel/NET/Netfilter/ipvs/ip_vs_lblc.ko

Kernel/NET/Netfilter/ipvs/ip_vs_lblcr.ko

Kernel/NET/Netfilter/ipvs/ip_vs_dh.ko

Kernel/NET/Netfilter/ipvs/ip_vs_sh.ko

Kernel/NET/Netfilter/ipvs/ip_vs_sed.ko

Kernel/NET/Netfilter/S/ip_vs_nq.ko

Kernel/NET/Netfilter/S/ip_vs_ftp.ko

Kernel/NET/Netfilter/ipvs/ip_vs_pe_sip.ko

B. Install LVS on Director Server

# Ln-S/usr/src/kernels/2.6.32-431. el6.x86 _ 64 // usr/src/Linux # kernel cannot be found for ipvsadm

# Yum install-y libnl *

# Yum install-y popt *

# Rpm-IVH popt-static-1.13-7.el6.x86_64.rpm # The first three steps are to resolve the software package for installing ipvsadm-1.26 errors

# Tar zxvf ipvsadm-1.26.tar.gz

# Cd ipvsadm-1.26

# Make

# Make install

# Ipvsadm -- help # The ipvsadm help prompt indicates that ipvsadm has been installed successfully.

C. LVS start/stop scripts

Vim/etc/init. d/lvsdr

#! /Bin/sh

# Description: Start LVS of Director Server

VIP = 10.0.2.200

Rip1 = 10.0.2.203

Rip2 = 10.0.2.204

Chmod 755/etc/rc. d/init. d/functions

/Etc/rc. d/init. d/functions

Case "$1" in

Start)

Echo "Start LVS of Director server"

# Set the virtual IP address and sysctl Parameter

/Sbin/ifconfig eth0: 0 $ VIP broadcast $ VIP netmask 255.255.255.255 up

/Sbin/route add-host $ VIP Dev eth0: 0

Echo "1">/proc/sys/NET/IPv4/ip_forward

# Clear ipvs table

/Sbin/ipvsadm-C

# Set LVS

/Sbin/ipvsadm-a-t $ VIP: 80-s rr

/Sbin/ipvsadm-a-t $ VIP: 80-r $ rip1: 80-G

/Sbin/ipvsadm-a-t $ VIP: 80-r $ rip2: 80-G

# Run LVS

/Sbin/ipvsadm

;;

Stop)

Echo "Close LVS directorserver"

Echo "0">/proc/sys/NET/IPv4/ip_forward

/Sbin/ipvsadm-C

/Sbin/route del-host $ VIP Dev eth0: 0

/Sbin/ifconfig eth0: 0 down

;;

*)

Echo "Usage: $0 {START | stop }"

Exit 1

Esac

# Chmod 755/etc/init. d/lvsdr

#/Etc/init. d/lvsdr start

# Service ipvsadm save # Save the LVS record to/etc/sysconfig/ipvsadm

# Service ipvsadm start

3) configure the Real Server

A. Install the HTTP service

# Tar-zxvf httpd-2.2.23.tar.gz

# Cd httpd-2.2.23

#./Configure -- prefix =/usr/local/Apache

# Make & make install

B. Configure httpd

# Cp/usr/local/Apache/bin/apachectl/etc/init. d/httpd

# Vim/etc/init. d/httpd

Modify the file, in the file '#! Add the following two rules after/bin/Sh:

#! /Bin/sh

#

# Chkconfig: 2345 85 15

# Description: Apache is a World Wide Web Server

#

# Chkconfig -- add httpd

# Chkconfig -- list httpd

# Service httpd start

C. Configure VIP and ARP

# Vim/etc/init. d/lvsrs

#! /Bin/bash

# Description: Start Real Server

VIP = 10.0.2.200

/Etc/rc. d/init. d/functions

Case "$1" in

Start)

Echo "Start LVS of Real Server"

/Sbin/ifconfig lo: 0 $ VIP broadcast $ VIP netmask 255.255.255.255 up

/Sbin/route add-host $ VIP Dev lo: 0

Echo "1">/proc/sys/NET/IPv4/CONF/LO/arp_ignore

Echo "2">/proc/sys/NET/IPv4/CONF/LO/arp_announce

Echo "1">/proc/sys/NET/IPv4/CONF/All/arp_ignore

Echo "2">/proc/sys/NET/IPv4/CONF/All/arp_announce

Sysctl-P

;;

Stop)

/Sbin/ifconfig lo: 0 down

/Sbin/route del-host $ VIP Dev lo: 0

Echo "Close LVS Director server"

Echo "0">/proc/sys/NET/IPv4/CONF/LO/arp_ignore

Echo "0">/proc/sys/NET/IPv4/CONF/LO/arp_announce

Echo "0">/proc/sys/NET/IPv4/CONF/All/arp_ignore

Echo "0">/proc/sys/NET/IPv4/CONF/All/arp_announce

;;

*)

Echo "Usage: $0 {START | stop }"

Exit 1

Esac

# Chmod 755/etc/init. d/lvsrs

#/Etc/init. d/lvsrs start

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