标签：
LVS-DR-MASTER:10.0.0.1 LVS-DR-BACKUP:10.0.0.5 LVS-DR-VIP:10.0.0.200 LVS-RS1：10.0.0.2 LVS-RS2：10.0.0.3 LVS-RS4：10.0.0.4
LVS使用RD模式做负载均衡，keepalived做高可用性+资源健康检查，其中LVS的DR端配置由keepalived配置完成，无需单独编写配置脚本。yum install -y ipvsadm keepalived
编辑LVS-DR-MASTER上的keepalived配置文件/etc/keepalived/keepalived.conf （LVS-DR-BACKUP上的配置与MASTER上的基本一致，只需要修改两处：修改state为BACKUP，修改priority小于MASTER即可。）
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
test@gmail.com
}
notification_email_from test@gmail.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
#定义VIP1
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.200
}
}
virtual_server 10.0.0.200 80 {
delay_loop 6
lb_algo rr
lb_kind DR
nat_mask 255.255.255.0
persistence_timeout 50
protocol TCP
real_server 10.0.0.2 80 {
weight 1
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 10.0.0.3 80 {
weight 1
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 10.0.0.4 80 {
weight 1
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
service keepalived start
[root@localhost ~]# vim /etc/init.d/lvsdr_rs #!/bin/bash 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 VIP=10.0.0.200 ifconfig lo:0 down ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up route add -host $VIP dev lo:0
[root@localhost ~]# chmod +x /etc/init.d/lvsdr_rs [root@localhost ~]# /etc/init.d/lvsdr_rs
高可用性：正常情况下，VIP在MASTER上，当MASTER出现问题时，VIP会漂移到BACKUP上，如果MASTER恢复正常，VIP会重新漂移到MASTER上。负载均衡：keepalived会定时检查资源的可用性，当资源不可用时，keepalived会自动剔除这个资源，当资源恢复可用后，keepalived会自动把资源添加回资源池。结论：高可用性和负载均衡工作正常，OK！！！标签：
原文地址：http://www.cnblogs.com/xelaris/p/5558230.html
