Centos 5.5 lvs+keepalived 安装配置

部署:
LVS-MASTER : 192.168.1.2
LVS-BACKUP : 192.168.1.3
LVS-VIP : 192.168.1.4
Realserver-1 : 192.168.1.5
Realserver-2 : 192.168.1.6

1. 系统采用最小化安装

2. 安装ipvsadm
# yum install ipvsadm

3. 安装keepalived前提
# yum install -y wget
# yum install -y gcc gcc-c++ make
# yum install -y openssl-devel kernel-devel

4. 安装keepalived
# wget http://www.keepalived.org/software/keepalived-1.2.1.tar.gz
# ln -s /usr/src/kernels/2.6.18-194.26.1.el5-i686 /usr/src/linux
# tar zxvf keepalived-1.2.1.tar.gz
# cd keepalived-1.2.1
# ./configure
(注意这个步骤要看到以下字样才是正常的)
Use IPVS Framework : Yes
IPVS sync daemon support : Yes
# make && make install

5. 配置
# cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
# mkdir /etc/keepalived
# cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
# cp /usr/local/sbin/keepalived /usr/sbin/
# chkconfig –add keepalived
# chkconfig –level 2345 keepalived on

# vi /etc/keepalived/keepalived.conf

01	! Configuration File for keepalived

02

03	global_defs {

04	notification_email {

05

[e-mail]

10

}

11	notification_email_from [e-mail]

16	smtp_server 127.0.0.1

17	# smtp_connect_timeout 30

18	router_id LVS_DEVEL

19

}

20

21	vrrp_instance VI_1 {

22	state MASTER # 备份LB将MASTER改为BACKUP

23	interface eth0

24	virtual_router_id 51

25	priority 100 # 优先级,备份LB值改为比这个值小

26	advert_int 1

27	authentication {

28	auth_type PASS

29	auth_pass 1111

30

}

31	virtual_ipaddress {

32	192.168.1.4 # 多个VIP换行写

33

}

34

}

35

36	virtual_server 192.168.1.4 80 {

37	delay_loop 6 #每隔6秒查询realserver状态

38	lb_algo wrr # LVS 算法

39	lb_kind DR # LVS模式 DR是直接路由

40	persistence_timeout 60 #同一IP连接60秒内分配到同一台realserver

41	protocol TCP #TCP协议检测realserver状态

42

43	real_server 192.168.1.5 80 {

44	weight 3 #权重

45	TCP_CHECK {

46	connect_timeout 10 #10秒无响应超时

47	nb_get_retry 3

48	delay_before_retry 3

49	connect_port 80

50

}

51

}

52	real_server 192.168.1.6 80 {

53

weight 3

54	TCP_CHECK {

55	connect_timeout 10

56	nb_get_retry 3

57	delay_before_retry 3

58	connect_port 80

59

}

60

}

61

}

6. Realserver主机上执行以下脚本

01	#!/bin/bash

02

03	VIP=192.168.1.4

04

05	. /etc/rc.d/init.d/functions

06

07	case "$1" in

08

start)

09	ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP

10	/sbin/route add -host $VIP dev lo:0

11	echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore

12	echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce

13	echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore

14	echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce

15	sysctl -p >/dev/null 2>&1

16	echo "RealServer Start OK"

17

;;

18

stop)

19	ifconfig lo:0 down

20	route del $VIP >/dev/null 2>&1

21	echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore

22	echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce

23	echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore

24	echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce

25	echo "RealServer Stoped"

26

;;

27

*)

28	echo "Usage: $0 {start|stop}"

29

exit 1

30

esac

31

32

exit 0

7. 检查测试
主备LB上执行
# service keepalived start
# ipvsadm -ln
检查ipvsadm是否服务正常

再把主LB执行
# service keepalived stop
查看备LB是否会自动接管VIP

另外就是做Realserver停止服务的测试,具体就不详说了.