由于在当初的系统集成过程中对负载均衡器的配置有问题, 一直都是单机 在跑web应用,由于业务量很小,因此,考虑通过最简单、可靠的主从双机方式解决web应用单点故障问题。
现网环境:
web1: 10.0.0.7 (rhel6.2 64位,部署tongweb中间件)
web2: 10.0.0.8 (rhel6.2 64位,部署tongweb中间件)
改造 后的系统构成:
web1: 10.0.0.7 (keepalived+tongweb中间件)
web2: 10.0.0.8 (keepalived+tongweb中间件)
VIP: 10.0.0.2 (keepalived中配置为virtual server地址)
1、首先在web1、web2上安装keepalived服务:
yum install -y keepalived
2、在web1上配置keepalived,配置文件/etc/keepalived/keepalived.conf文件如下:
! Configuration File for keepalived
global_defs {
notification_email {
yuwb@zycsy.cn
}
notification_email_from yuwb@zycsy.cn
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id web-ha
}
vrrp_instance VI_1 {
state master
interface em1
virtual_router_id 52
priority 100
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.2
}
}
virtual_server 10.0.0.2 80 {
delay_loop 6
lb_algo wrr
lb_kind DR
persistence_timeout 1200
protocol TCP
real_server 10.0.0.7 80 {
weight 3
notify_down /etc/keepalived/killkeepalived.sh
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
上面配置文件中用到的脚本 /etc/keepalived/killkeepalived.sh 如下:
#!/bin/sh
service keepalived stop
增加可执行权限:
chmod +x /etc/keepalived/killkeepalived.sh
3、在web2上配置keepalived,配置文件/etc/keepalived/keepalived.conf文件与web1的配置文件有区别的地方是:
vrrp_instance VI_1 {
state master <--------将master 改为 slave
.................
priority 100 <--------将100改为 80
................
real_server 10.0.0.7 80 { <--------将10.0.0.7改为 10.0.0.8
................
配置文件 /etc/keepalived/killkeepalived.sh 与web1的一样。
4、启动web1、web2的keepalived服务:
service keepalived start
将keepalived服务加到自启动服务中:
chkconfig keepalived on
本文出自 “yuweibing的技术博客” 博客,请务必保留此出处http://yuweibing.blog.51cto.com/3879355/1745367
原文地址:http://yuweibing.blog.51cto.com/3879355/1745367