linux下LVS+keepalives负载均衡高可用服务器配置
IP说明：lvs：10.10.10.3
lvs（备）：10.10.10.4
virtual：10.10.10.100
1 lvs和lvs(备)上建目录并将所需软件包放入
#mkdir /usr/local/src/lvs
2 lvs和lvs(备)上安装LVS和Keepalived
Lvs的安装
#tar zxvf ipvsadm-1.24.tar.gz
#cd ipvsadm-1.24
#make && make install
Keepalived的安装
#tar zxvf keepalived-1.1.15.tar.gz
#cd keepalived-1.1.15
#./configure && make && make install
将keepalived做成启动脚务，方便管理
#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/
#service keepalived start|stop
3 在web1、web2服务器上绑定虚拟IP
＃vim /etc/sysctl.conf
写入 net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
添加虚拟ip地址
#cd /etc/sysconfig/network-scripts/
#ls
#cp ifcfg-lo ifcfg-lo:0
#vim ifcfg-lo:0
#service network restart
#service httpd start
4在主从负载均衡服务器上配置keepalived.conf实现负载均衡和和高可用性
#vim /etc/keepalived/keepalived.conf
编缉keepalived.conf文件，内容如下：
! Configuration File for keepalived
global_defs {
notification_email {
lzc_a@yahoo.cn \\接收服务器通告邮箱
}
notification_email_from lzc_a@yahoo.cn
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER \\备份服务器上将MASTER改为BACKUP
interface eth0
virtual_router_id 51
priority 100 \\备份服务上将100改为99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.10.10.100 \\(如果有多个VIP，继续换行填写.)
}
}
virtual_server 10.10.10.100 80 {
delay_loop 6 \\(每隔10秒查询realserver状态)
lb_algo rr \\（轮询算法）
lb_kind DR
persistence_timeout 10
protocol TCP \\(用TCP协议检查realserver状态)
real_server 10.10.10.3 80 {
weight 3
TCP_CHECK {
connect_timeout 3 \\(3秒无响应超时)
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 10.10.10.4 80 {
weight 3
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
在主从负载均衡服务器上绑定虚拟IP
＃vim /etc/sysctl.conf
写入 net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
#cd /etc/sysconfig/network-scripts/
#ls
#cp ifcfg-eth0 ifcfg-eth0:1
#vim ifcfg-eth0:1
#service network restart
在主（Master）服务器上查看LVS服务是否正常
主：
#watch ipvsadm –ln
显示结果：
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddressort Scheduler Flags
-> RemoteAddressort Forward Weight ActiveConn InActConn
TCP10.10.10.100:80 rr persistent 10
-> 10.10.10.3:80 Route 3 0 0
-> 10.10.10.4:80 Route 3 0 0
查看从(Backup)服务器LVS服务是否正常
#watch ipvsadm –ln
显示结果：
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddressort Scheduler Flags
-> RemoteAddressort Forward Weight ActiveConn InActConn
TCP10.10.10.100:80 rr persistent 10
-> 10.10.10.3:80 Route 3 0 0
-> 10.10.10.4:80 Route 3 0 0
5测试是否实现负载均衡和高可用
从客户端ping web服务器的虚拟IP,然后用arp –a查看提供服务的服务器MAC
注:停一台负载均衡服务器后,ping过程并没有中断
服务提供者MAC为:08:00:27:9d:61:a6
客户机换一个IP后,再ping 然后用arp –a 查看提供服务的服务器MAC
服务提供者MAC为:74:ea:3a:45:ad:38
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