CentOS5.5 build an LVS Environment

CentOS5.5 build an LVS Environment

CentOS5.5 + LVS (Master + Slave) + 2 WEB,

The Web page is configured in advance to distinguish which real machine is assigned,

Firewall and selinux are disabled before the experiment.

1. Download related software packages
# Wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz
# Wget http://www.keepalived.org/software/keepalived-1.1.15.tar.gz

2. Install LVS and Keepalived

# Lsmod | grep ip_vs
# Uname-r

2.6.18-274.17.1.el5xen

# Tar zxvf ipvsadm-1.24.tar.gz

# Cd ipvsadm-1.24
# Make & make install

# Tar zxvf keepalived-1.1.15.tar.gz

# Cd keepalived-1.1.15

#./Configure-prefix =/usr/local/keepalived-with-kernel-dir =/usr/src/linux/

# Make & make install

# Cp/usr/local/keepalived/etc/rc. d/init. d/keepalived/etc/rc. d/init. d/

# Cp/usr/local/keepalived/etc/sysconfig/

# Mkdir/etc/keepalived

# Cp/usr/local/keepalived/etc/keepalived. conf/etc/keepalived/

# Cp/usr/local/keepalived/sbin/keepalived/usr/sbin/

#/Etc/init. d/keepalived start

Startingkeepalived: [OK]

3. Configure keepalived. conf as follows:

Master machine Configuration:

# VIP1

Vrrp_instance VI_1 {

StateBACKUP

# Lvs_sync_daemon_interface eth1

Nopreempt

Interfaceeth0

Virtual_router_id 62

Priority100 # change 100 to 99 on the backup service

Advert_int3

Authentication {

Auth_type PASS

Auth_pass 1111

}

Virtual_ipaddress {

192.168.2.228/16 brd 192.168.255.255 deveth0 label eth0: 0 ### bt web vip

}

}

Virtual_server 192.168.2.228 80 {

Delay_loop6 # (query realserver status every 10 seconds)

Lb_algowrr # (lvs algorithm)

Lb_kindDR # (Direct Route)

Persistence_timeout 60 # (connections from the same IP address are allocated to the same realserver within 60 seconds)

Inhibit_on_failure

ProtocolTCP # (use the TCP protocol to check the realserver status)

Real_server192.168.2.184 80 {

Weight10

Notify_down "/root/bin/notify_mail.sh btweb01194252.184 ″

TCP_CHECK {

Connect_timeout 10

Nb_get_retry 3

Delay_before_retry 3

Connect_port 80

}

}

Real_server192.168.2.199 80 {

Weight 10

Notify_down "/root/bin/notify_mail.sh btweb02 192.168.2.199 ″

TCP_CHECK {

Connect_timeout 10

Nb_get_retry 3

Delay_before_retry 3

Connect_port 80

}

}

}

Slave machine Configuration:

# VIP1

Vrrp_instance VI_1 {

StateBACKUP # change MASTER to BACKUP on the BACKUP server

# Lvs_sync_daemon_interface eth1

Nopreempt

Interfaceeth0

Virtual_router_id62

Priority100 # change 100 to 99 on the backup service

Advert_int3

Authentication {

Auth_type PASS

Auth_pass 1111

}

Virtual_ipaddress {

192.168.2.228/16 brd 192.168.255.255 dev eth0 label eth0: 0 ### btweb vip

}

}

Virtual_server 192.168.2.228 80 {

Delay_loop6 # (query realserver status every 10 seconds)

Lb_algowrr # (lvs algorithm)

Lb_kindDR # (Direct Route)

Persistence_timeout 60 # (connections from the same IP address are allocated to the same realserver within 60 seconds)

Inhibit_on_failure

ProtocolTCP # (use the TCP protocol to check the realserver status)

Real_server192.168.2.184 80 {

Weight10

Notify_down "/root/bin/notify_mail.sh btweb01 192.168.2.184 ″

TCP_CHECK {

Connect_timeout 10

Nb_get_retry 3

Delay_before_retry 3

Connect_port 80

}

}

Real_server192.168.2.199 80 {

Weight10

Notify_down "/root/bin/notify_mail.sh btweb02 192.168.2.199 ″

TCP_CHECK {

Connect_timeout 10

Nb_get_retry 3

Delay_before_retry 3

Connect_port 80

}

}

}

5. real machine configuration

[Root @ vm02 ~] # More lvs_real.sh

#! /Bin/bash

SNS_VIP = 192.168.2.228

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

Case "$1" in

Start)

Ifconfig lo: 0 $ SNS_VIP netmask 255.255.255.255 broadcast $ SNS_VIP

/Sbin/route add-host $ SNS_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)

Ifconfig lo: 0 down

Route del $ SNS_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

Exit0

6. Test

[Root @ test1 ~] # Ipvsadm-Ln

IP Virtual Server version 1.2.1 (size = 4096)

Prot LocalAddress: Port sched1_flags

-> RemoteAddress: Port Forward Weight ActiveConn InActConn

TCP 192.168.2.228: 80 wrr persistent 60

-> 192.168.2.184: 80 Route 10 0 0

-> 192.168.2.199: 80 Route 10 0 5

Disable the realserver machine:

Ipvsadm-d-t 192.168.2.228: 80-r192.168.2.199: 80

Enable the realserver machine:

Ipvsadm-a-t 192.168.2.228: 80-r192.168.2.199: 80

1. Turn off any web or nginx and the webpage can be accessed normally.

2. Disable any lvs and the webpage can be accessed normally.

Verify that the experiment is successful.