? ? ? ? ? ? ? ?


1、整体架构图如下

Nginx+keepalived高可用配置实战_Java


2、环境准备

今天所配置的是keepalived+nginx 的负载均衡

下载keepalived软件

[root@LB01 tools]# wget http://sb138.99sbgw.com/software/keepalived-1.1.17.tar.gz

注意安装前检查内核的link文件

root@LB02 tools]# ll /usr/src/

total 8

drwxr-xr-x. 2 root root 4096 Sep 23? 2011 debug

drwxr-xr-x. 3 root root 4096 Oct 19 02:03 kernels

lrwxrwxrwx. 1 root root 43 Oct 19 02:05 linux -> /usr/src/kernels/2.6.32-642.6.1.el6.x86_64/

安装keepalived之前,安装几个依赖包

yum install openssl-devel -y

yum install popt* -y

然后进行编译安装keepalived,前面介绍了安装过程,这里就不演示了

./configure得出下面的结果

Keepalived configuration

------------------------

Keepalived version??? : 1.1.17

Compiler???????? : gcc

Compiler????????: -g -O2

Extra Lib??????: -lpopt -lssl -lcrypto

Use IPVS Framework???: Yes

IPVS sync daemon support : Yes

Use VRRP Framework??? : Yes

Use LinkWatch??????: No

Use Debug flags?????: No

注意./configure之后的结果,没有错误就可以了

make && make install

之后规范配置、启动文件路径

/bin/cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/

/bin/cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/

mkdir /etc/keepalived -p

/bin/cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/

/bin/cp /usr/local/sbin/keepalived /usr/sbin/

/etc/init.d/keepalived start

注:nginx负载均衡相关配置请参考前面的文章

LNMP架构应用实战—Nginx反向代理负载均衡配置


3、实战配置keepalived

[root@LB01 keepalived]# vi keepalived.conf?

! Configuration File for keepalived?

global_defs {

?? notification_email {

?? abc@qq.com

?? }

?? notification_email_from Alexandre.Cassen@firewall.loc

?? smtp_server 1.1.1.1

?? smtp_connect_timeout 30

?? router_id LVS_3

}

vrrp_instance VI_1 {

??? state MASTER

??? interface eth0

??? virtual_router_id 19

??? priority 150

??? advert_int 1

??? authentication {

??????? auth_type PASS

??????? auth_pass 1111

??? }

??? virtual_ipaddress {

??????? 192.168.1.254/24

??? }

}

[root@LB02 keepalived]# vi keepalived.conf

! Configuration File for keepalived

global_defs {

?? notification_email {

?? abc@qq.com

?? }

?? notification_email_from Alexandre.Cassen@firewall.loc

?? smtp_server 1.1.1.1

?? smtp_connect_timeout 30

?? router_id LVS_6

}

vrrp_instance VI_1 {

??? state BACKUP

??? interface eth0

??? virtual_router_id 19

??? priority 100

??? advert_int 1

??? authentication {

??????? auth_type PASS

??????? auth_pass 1111

??? }

??? virtual_ipaddress {

??????? 192.168.1.254/24

??? }

}

[root@LB01 keepalived]# /etc/init.d/keepalived start

Starting keepalived:????[? OK? ]

[root@LB02 keepalived]# /etc/init.d/keepalived start

Starting keepalived????[? OK? ]

[root@LB01 keepalived]# ip add|grep 192.168.1.254

??? inet 192.168.1.254/24 scope global secondary eth0

[root@LB02 keepalived]# ip add|grep 192.168.1.254

测试访问

Nginx+keepalived高可用配置实战_Java_02

表明可以正常切换


现在我们模拟keepalived主宕机,再测试

[root@LB01 conf]# /etc/init.d/keepalived stop

Stopping keepalived:? ?[? OK? ]

[root@LB02 ~]# ip add|grep 254

??? inet 192.168.1.254/24 scope global secondary eth0

Nginx+keepalived高可用配置实战_Java_03



4、反向代理服务故障自动切换

如果实际生产环境中当keeplived主的服务器nginx服务宕机,但是主又有VIP,这时就出现无法访问的现象,因此可以做如下的配置,使得这种情况可自已切换

vi check_nginx.sh

#!/bin/sh

white true

do

PNUM=`ps -ef|grep nginx|wc -l`

#这里也可使用nmap 192.168.1.3 -p 80|grep open|wc -l来判断个数

if [ $PNUM -lt 3 ];then

/etc/init.d/keepalived stop >/dec/null 2>&1

kill -9 keealived >/dec/null 2>&1

kill -9 keealived >/dec/null 2>&1

fi

sleep 5

done

sh check_nginx.sh &

启动个守护进程进行检查(或者加入定时任务定时执行检查),如果nginx服务出现故障,就立马停掉keepalived的服务,让它自动切换到备节点上去,这样就实现了自动切换的工作