CentOS5.5环境下布署LVS+keepalived

#!/bin/bash
# BY kerryhu
# MAIL:king_819@163.com
# BLOG:http://kerry.blog.51cto.com
# Please manual operation yum of before Operation…..
系统环境`:CentOS 5.5(定制安装)
组件:
Base
Development Libraries
Development Tools
Editors
Text-based Internet

lvs-master:192.168.9.201
lvs-backup:192.168.9.202
vip:192.168.9.200
web1:192.168.9.203
web2:192.168.9.204
netmask:255.255.255.0
gateway:192.168.9.1

网络拓扑:

echo “============================ 更新系统时间 ======================”
yum install -y ntp
ntpdate time.nist.gov
echo “00 01 * * * /usr/sbin/ntpdate time.nist.gov” /etc/crontab

echo “============================ 关闭不用服务 =======================”
/root/del_servcie.sh           # 附件中自定义脚本

一.下面开始LVS的配置:

echo “========================= 安装ipvsadm、keepalived ==================”
[root@master ~]# cd /usr/local/src
[root@master ~]# wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz
[root@master ~]# ln -sv /usr/src/kernels/2.6.18-194.el5-i686/ /usr/src/linux
[root@master ~]# tar -zxvf ipvsadm-1.24.tar.gz
[root@master ~]# cd ipvsadm-1.24
[root@master ~]# make;make install
[root@master ~]# cd ..

[root@master ~]# wget http://www.keepalived.org/software/keepalived-1.1.17.tar.gz
[root@master ~]# tar -zxvf keepalived-1.1.17.tar.gz
[root@master ~]# cd keepalived-1.1.17
[root@master ~]# ./configure
configure: error:
!!! OpenSSL is not properly installed on your system. !!!
!!! Can not include OpenSSL headers files.
解决办法:
[root@master ~]# yum -y install openssl-devel
[root@master ~]# ./configure
[root@master ~]# make;make install
编译的时候出现这个提示,说明keepalived和内核结合了,如果不是这样的,需要加上这个参数./configure –with-kernel-dir=/kernel/path

Keepalived configuration

————————
Keepalived version       : 1.1.17
Compiler                 : gcc
Compiler flags           : -g -O2
Extra Lib                : -lpopt -lssl -lcrypto
Use IPVS Framework       : Yes
IPVS sync daemon support : Yes
Use VRRP Framework       : Yes
Use LinkWatch            : No
Use Debug flags          : No

echo “======================= 配置keepalived ===========================”
[root@master ~]#  cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
[root@master ~]#  cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
[root@master ~]#  mkdir /etc/keepalived
[root@master ~]#  cp /usr/local/sbin/keepalived /usr/sbin/
[root@master ~]# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
notification_email {
king_819@163.com
}
notification_email_from king_819@163.com
smtp_server smtp.163.com
# smtp_connect_timeout 30
router_id LVS_DEVEL
}

# VIP1
vrrp_instance VI_1 {
state MASTER             #备份服务器上将MASTER改为BACKUP
interface eth0
lvs_sync_daemon_inteface eth0
virtual_router_id 51
priority 100    # 备份服务上将100改为90
advert_int 5
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.9.200
#(如果有多个VIP,继续换行填写.)
}
}

virtual_server 192.168.9.200 80 {
delay_loop 6                  #(每隔10秒查询realserver状态)
lb_algo wlc                  #(lvs 算法)
lb_kind DR                  #(Direct Route)
persistence_timeout 60        #(同一IP的连接60秒内被分配到同一台realserver)
protocol TCP                #(用TCP协议检查realserver状态)

real_server 192.168.9.203 80 {
weight 100               #(权重)
TCP_CHECK {
connect_timeout 10       #(10秒无响应超时)
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.9.204 80 {
weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
[root@master ~]#  service keepalived start|stop
[root@master ~]# chkconfig –level 2345 keepalived on

二.配置后端的realserver,这里为web_1和web_2

echo “====================== 配置realserver =========================”
[root@web_1 ~]# vi /root/lvs_real.sh
#!/bin/bash
# description: Config realserver
#Written by : http://kerry.blog.51cto.com

SNS_VIP=192.168.9.200

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

case “$1” in
start)
/sbin/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)
/sbin/ifconfig lo:0 down
/sbin/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

exit 0

[root@web_1 ~]# chmod +x /roo/lvs_real.sh
[root@web_1 ~]# /root/lvs_real.sh start
[root@web_1 ~]# ifconfig

[root@web_1 ~]# echo “/root/lvs_real.sh start” >> /etc/rc.local

三.测试LVS

echo “===================== 测试LVS+keepalived ========================”

1.首先测试lvs主备的高可用性(HA)

#LVS_master、LVS_backup上开启keepalived,LVS_master先绑定VIP
LVS_master:

LVS_backup:

#解析域名,测试访问,LVS转发

#测试关闭LVS_master,短暂的掉包后,LVS_backup马上接替工作


LVS_backup接替LVS_master绑定VIP

以下为vip_bacup机器的ip信息:

LVS_backup负责转发

LVS_master重启完成后,就会自动接回控制权,继续负责转发

2.测试realserver的高可用性(HA)

#测试关闭其中一台realserver

通过上面测试可以知道,当realserver故障或者无法提供服务时,负载均衡器通过健康检查自动把失效的机器从转发队列删除掉,实现故障隔离,保证用户的访问不受影响.

#重启被关闭的realserver

当realserver故障恢复后,负载均衡器通过健康检查自动把恢复后的机器添加到转发队列中

本文出自 “聆听未来” 博客,请务必保留此出处http://kerry.blog.51cto.com/172631/401253

相关教程:

linux下利用Haproxy和keepalived实现简单负载均衡:http://blog.haohtml.com/archives/10975