Deploy LVS (DR) + Keepalived in RHEL5.4 to achieve high-performance and high-availability Load Balancing

I. Introduction to the functions implemented by LVS + Keepalived: Use the LVS controller master/slave mode to avoid spof and automatically delete the faulty WEB server node and add it to the cluster after it is restored. Topology: 2. System Environment System Platform: RHEL5.4LVS version: ipvsadm-1.24keepalived version: keepalived-1.1.15 3. installation 1. Install lvs, ke on two lvsservers

I. Introduction

Functions implemented by LVS + Keepalived: Use the Master/Slave Mode of The LVS controller to avoid spof and automatically delete the faulty WEB server node and add it to the cluster after it is restored.

Topology:

Ii. System Environment

System Platform: RHEL 5.4

LVS version: ipvsadm-1.24

Keepalived version: keepalived-1.1.15

Iii. Installation

1. Install LVS and keepalived software (LVS_MASTER & LVS_BACKUP) on two lvs servers)
Lvs install -------------

[Root @ LVS-MASTER ~] # Wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz

[Root @ LVS-MASTER ~] # Ln-s/usr/src/kernels/2.6.18-194. el5-i686 // usr/src/linux/

[Root @ LVS-MASTER ~] # Tar zxvf ipvsadm-1.24.tar.gz

[Root @ LVS-MASTER ~] # Cd ipvsadm-1.24

[Root @ LVS-MASTER ipvsadm-1.24] # make & make install

Keepalived install-------------

[Root @ LVS-MASTER ~] # Wget http://www.keepalived.org/software/keepalived-1.1.15.tar.gz

[Root @ LVS-MASTER ~] # Tar zxvf keepalived-1.1.15.tar.gz

[Root @ LVS-MASTER ~] # Cd keepalived-1.1.15

[Root @ LVS-MASTER keepalived-1.1.15] #./configure & make install

######## Make keepalived a startup service for convenient management ##########

[Root @ LVS-MASTER ~] # Cp/usr/local/etc/rc. d/init. d/keepalived/etc/init. d/

[Root @ LVS-MASTER ~] # Cp/usr/local/etc/sysconfig/keepalived/etc/sysconfig/

[Root @ LVS-MASTER ~] # Mkdir/etc/keepalived/

[Root @ LVS-MASTER ~] # Cp/usr/local/etc/keepalived. conf/etc/keepalived/

[Root @ LVS-MASTER ~] # Cp/usr/local/sbin/keepalived/usr/sbin/

[Root @ LVS-MASTER ~] # Service keepalived start | stop

2. keepalived Configuration

################### MASTER ###################

! Configuration File for keepalived

Global_defs {
Notification_email {
Root@linux.tang.chao
Mchina_tang@qq.com
}
Notification_email_from Alexandre.Cassen@firewall.loc
Smtp_server 127.0.0.1
Smtp_connect_timeout 30
Router_id LVS_DEVEL
}

Vrrp_instance VI_1 {
State MASTER
Interface eth0
Virtual_router_id 51
Priority100
Advert_int 1
Authentication {
Auth_type PASS
Auth_pass 1111
}
Virtual_ipaddress {
10.0.0.148
}
}

Virtual_server 10.0.0.148 80 {
Delay_loop 6
Lb_algo rr
Lb_kind DR
Persistence_timeout 50
Protocol TCP

Real_server 10.0.0.20.80 {
Weight 3
TCP_CHECK {
Connect_timeout 10
Nb_get_retry 3
Delay_before_retry 3
Connect_port 80
}
}
Real_server 10.0.0.139 80 {
Weight 3
TCP_CHECK {
Connect_timeout 10
Nb_get_retry 3
Delay_before_retry 3
Connect_port 80
}
}
}

 

#################### BACKUP ###################

! Configuration File for keepalived

Global_defs {
Notification_email {
Root@linux.tang.chao
Mchina_tang@qq.com
}
Notification_email_from Alexandre.Cassen@firewall.loc
Smtp_server 127.0.0.1
Smtp_connect_timeout 30
Router_id LVS_DEVEL
}

Vrrp_instance VI_1 {
State BACKUP
Interface eth0
Virtual_router_id 51
Priority 99
Advert_int 1
Authentication {
Auth_type PASS
Auth_pass 1111
}
Virtual_ipaddress {
10.0.0.148
}
}

Virtual_server 10.0.0.148 80 {
Delay_loop 6
Lb_algo rr
Lb_kind DR
Persistence_timeout 50
Protocol TCP

Real_server 10.0.0.20.80 {
Weight 3
TCP_CHECK {
Connect_timeout 10
Nb_get_retry 3
Delay_before_retry 3
Connect_port 80
}
}
Real_server 10.0.0.139 80 {
Weight 3
TCP_CHECK {
Connect_timeout 10
Nb_get_retry 3
Delay_before_retry 3
Connect_port 80
}
}
}

3. Run the realserver. sh script on the two Web servers to bind lo: 0 to the VIP address 10.0.0.148 and suppress ARP broadcast.

[Root @ web1 ~] # Cat realserver. sh
#! /Bin/bash
# Description: Config realserver

VIP = 10.0.0.148
 
/Etc/rc. d/init. d/functions
 
Case "$1" in
Start)
/Sbin/ifconfig lo: 0 $ VIP netmask 255.255.255.255 broadcast $ VIP
/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>/dev/null 2> & 1
Echo "RealServer Start OK"
;;
Stop)
/Sbin/ifconfig lo: 0 down
/Sbin/route del $ VIP>/dev/null 2> & 1
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 "RealServer Stoped"
;;
*)
Echo "Usage: $0 {start | stop }"
Exit 1
Esac
 
Exit 0

[Root @ web1 ~] # Sh realserver. sh start