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Nginx+keepalived高可用性负载均衡

[日期:2011-07-05] 来源:Linux社区  作者:ehlopxp [字体: ]

一、前言

nginx进程基于于Master+Slave(worker)多进程模型,自身具有非常稳定的子进程管理功能。在Master进程分配模式下,Master进程永远不进行业务处理,只是进行任务分发,从而达到Master进程的存活高可靠性,Slave(worker)进程所有的业务信号都 由主进程发出,Slave(worker)进程所有的超时任务都会被Master中止,属于非阻塞式任务模型。

Keepalived是Linux下面实现VRRP 备份路由的高可靠性运行件。基于Keepalived设计的服务模式能够真正做到主服务器和备份服务器故障时IP瞬间无缝交接。二者结合,可以构架出比较稳定的软件lb方案。

二、nginx+keepalived架构实战

采用两台服务器做nginx主备,后端采用两个realserver(可以随意扩展),数据库采用MySQL主从(这里就不说主从的配置了!)

1、  架构图如下:

             

       

Server 

ip

nginx master 

192.168.1.108

nginx backup

192.168.1.110

vip

192.168.1.100

real server1

192.168.1.105

real server2

192.168.1.103

 

2、  安装配置

1)、安装keepalived(在nginxmaterbackup都安装)

  wget http://www.keepalived.org/software/keepalived-1.1.19.tar.gz
tar zxvf keepalived-1.1.19.tar.gz
cd keepalived-1.1.19
./configure --prefix=/usr/local/keepalived
make
make install
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
mkdir /etc/keepalived
cd /etc/keepalived/

 配置nginx masterkeepalived配置文件

[root@zhang1 keepalived]# cat /etc/keepalived/keepalived.conf

 

bal_defs {

        notification_email {

               jimo291@gmail.com

        }

        notification_email_from jimo291@gmail.com

        smtp_server 127.0.0.1

        smtp_connect_timeout 30

        router_id test1

 

}

 

vrrp_instance VI_1 {

        state MASTER

        interface eth0

        virtual_router_id 51

        priority 100

        advert_int 1

        smtp_alert

        authentication {

                auth_type PASS

                auth_pass 123

        }

        virtual_ipaddress {

                192.168.1.100

        }

}

 

            配置nginx backupkeepalived配置文件

       [root@zhang1 keepalived]# cat /etc/keepalived/keepalived.conf

 

bal_defs {

        notification_email {

                jimo291@gmail.com

        }

        notification_email_from jimo291@gmail.com

        smtp_server 127.0.0.1

        smtp_connect_timeout 30

        router_id test2

 

}

 

vrrp_instance VI_1 {

        state BACKUP

        interface eth0

        virtual_router_id 51

        priority 80

        advert_int 1

        smtp_alert

        authentication {

                auth_type PASS

                auth_pass 123

        }

        virtual_ipaddress {

                192.168.1.100

        }

}

 

            启动keepalived!,查看虚拟IP是否绑定!

            [root@zhang1 ~]# /etc/rc.d/init.d/keepalived start

            Starting keepalived:                                       [  OK  ]

            [root@zhang1 ~]# ip addr

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

    inet6 ::1/128 scope host

       valid_lft forever preferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000

    link/ether 00:0c:29:65:b4:ed brd ff:ff:ff:ff:ff:ff

    inet 192.168.1.108/24 brd 192.168.1.255 scope global eth0

    inet 192.168.1.100/32 scope global eth0

    inet6 fe80::20c:29ff:fe65:b4ed/64 scope link

       valid_lft forever preferred_lft forever

3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast qlen 1000

    link/ether 00:0c:29:65:b4:f7 brd ff:ff:ff:ff:ff:ff

4: sit0: <NOARP> mtu 1480 qdisc noop

    link/sit 0.0.0.0 brd 0.0.0.0

         红色部分显示IP已经加载过来了!

linux
相关资讯       Nginx  keepalived 
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