lvs+dr模式（关键操作）

1）  IP配置（配置回环接口添加虚拟ip，让他代为转发）

/sbin/ifconfig lo:0 192.168.1.96 broadcast 192.168.1.96 netmask 255.255.255.255 up

/sbin/ifconfig lo:1 192.168.1.97 broadcast 192.168.1.97 netmask 255.255.255.255 up

/sbin/route add -host 192.168.1.96 dev lo:0

/sbin/route add -host 192.168.1.97 dev lo:1

写入配置文件,开机自动执行 /etc/rc.local

1）  ARP（arp）抑制配置,让当客户端发送广播的时候，realserver闭嘴

/etc/sysctl.conf

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

Director配置1.10和1.98：

1）  keepalived配置

#给出部分参考配置

1.10

! Configuration File for keepalived

global_defs {

lvs_id BACKUP

}

vrrp_sync_group MAIL {

group {

VI_1_500

}

}

vrrp_instance VI_1_500 {

state BACKUP

interface eth0

virtual_router_id 95

#1.98的优先级设置为100

priority 150

advert_int 5

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.1.96/24

192.168.1.97/24

}

}

###############################################################

#this virtual server is the setting of Email Server SMTP port

###############################################################

virtual_server 192.168.1.97 25 {

delay_loop 6

lb_algo rr

lb_kind DR

persistence_timeout 50

protocol TCP

real_server 192.168.1.99 25 {

weight 1

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

connect_port 25

}

}

}