nginx+keepalived构建高可用web服务器

fengda

随着nginx的发展越是成熟，nginx的高并发、高稳定性及支持反向代理等特性使得其倍受青睐。下面笔者就来对nginx+keepalived的高可用架构进行简单搭建。笔者水平有限，仅供参考，如有不足望指正。见笑了。^_^ ^_^

一、实验环境

系统环境：centos 6.0 x86_64

nginx版本 nginx-1.2.7

keepalived版本 keepalived-1.26.tar.gz

nginx_1  192.168.1.105  (master)

nginx_2  192.168.1.106  (backup)

vip       192.168.1.200

二、nginx安装配置

分别在105、106俩台实验机器上执行下面脚本，安装配置nginx:

#!/bin/bash

##This is a auto install nginx shell scripts.

##li  2013-03-16

##defie path

DIR1=/usr/local/src/

DIR2=/usr/local/nginx/

DIR3=http://nginx.org/download/nginx-1.2.7.tar.gz  

DIR4=/usr/local/src/nginx-1.2.7.tar.gz

DIR5=nginx-1.2.7  

yum install pcre pcre-devel -y

if

[ $UID -ne 0 ];then

The shell scripts user must is root or adminstrator,please change user.

sleep 3

exit

fi

if

[ ! -d $DIR2 ];then

mkdir -p /usr/local/nginx/

else

echo  "The directory was exit."

fi

download ()

{

cd $DIR1 ;wget $DIR3

if

[ ! -f $DIR4 ];then

ehco  'The nginx source packages  download was defeated,please check.'

else

echo  'The nginx source packages was downloaded.'

fi

}

install ()

{

tar zxvf $DIR4 ;cd  $DIR5 &&./configure --prefix=$DIR2 &&make &&make install

if

[ $? -ne 0 ];then

echo  'The nginx insall was defeated,please check.'

else

echo 'The nginx was insatlled.'

fi

}

start ()

{

/usr/local/nginx/sbin/nginx &&ps -ef |grep nginx |grep -v grep

}

stop ()

{

pkill nginx

}

download &&install &&start &&stop

执行该脚本过程中如无报错，说明我们的nginx安装成功。

三、安装配置keepalived

在105跟106上执行该脚本，内容如下：

#!/bin/bash

##auto install keepalived shell scripts.

##li 2013-03-16

##define PATH

DIR1=/usr/local/src/

DIR2=/usr/local/

DIR3=keepalived-1.2.6.tar.gz

DIR4=keepalived-1.2.6

DIR5=/usr/src/kernels/2.6.32-220.e16.x86_64/

if

[ $UID -ne 0 ];then

echo 'The shell scripts user must be root or administrator,please change user.'

sleep 3  

exit 0

fi  

download ()

{

cd $DIR1 ;wget http://www.keepalived.org/software/keepalived-1.2.6.tar.gz

if

[ $? -ne 0 ];then

echo  'Download keepalived source package was failed,please check network or download state.'

else

echo 'Download keepalived source package  successfully.'

fi

}

install ()

{

tar zxvf $DIR3 &&cd $DIR4 &&./configure --with-kernel-dir=$DIR5 &&make &&make install

if

[ $? -ne 0 ];then

echo 'Install keepalived was failed,please check.'

else

echo 'Install keepalived successfully.'

fi

}

configure_keepalived  ()

{

cp $DIR2/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/ &&cp $DIR2/etc/sysconfig/keepalived /etc/sysconfig/ &&cp $DIR2/sbin/keepalived /sbin/  &&mkdir -p /ect/keepalived.conf

if

[ $? -ne 0 ];then

echo 'Keepalived configure was failed,please check.'

else

echo 'Keepalived configure successfully.'

fi

}

PS3="Please insert select Menu:"

select i in "download" "install" "configure_keepalived"

do

$i

done   （添加这五行，在执行脚本过后会随后根据选择的选项去执行下一步动作，方便只下载等说什么的单一动作，执行完成后按 alt+c 退出）

执行过程中无报错，则说明keepalived安装成功。下一步，新建keepalived配置文件keepalived.conf 内容如下：

! Configuration File for keepalived

global_defs {

  notification_email {

      lifenlun163@163.com

}

    notification_email_from lifenlun163@163.com

    smtp_server 127.0.0.1

    smtp_connect_timeout 30

    router_id LVS_DEVEL

}

vrrp_script chk_nginx {

    script "/data/sh/check_nginx.sh"

    interval 2

    weight 2

}

# VIP1

vrrp_instance VI_1 {

     state MASTER

     interface eth0

     lvs_sync_daemon_inteface eth0

     virtual_router_id 151

     priority 100

     advert_int 5

     nopreempt

     authentication {

         auth_typePASS

         auth_pass  1111

     }

     virtual_ipaddress {

         192.168.1.200

     }

     track_script {

     chk_nginx

    }

}

在106上的配置文件/etc/keepalived/keepalived上修改参数：state为BACKUP模式、优先级priority 为90（低于MASTER的优先级即可）,根据上面的配置，我们建立一个check_nginx.sh脚本，用来查看nginx是否存活来切换nginx服务器。check_nginx.sh脚本内容如下：
#！/bin/bash
##auto check nginx process
##li 2013-03-16
killall -0 nginx
if
[ $? -ne 0 ];then
/etc/init.d/keepalived stop
fi
五、启动测试nginx+keepalived高可用
在105跟106上都执行以下步骤：
1.启动nginx执行：    /usr/local/nginx/sbin/nginx
2.启动keepalived执行：/etc/rc.d/init.d/keepalived start
3.执行脚本: /data/sh/check_nginx.sh
在浏览器访问：192.168.1.200

因我们的105上设置的是MASTER模式，所以我们去查看105下的日志文件：

从上面可用观察出105为MASTER模式，现在我们宕掉105的nginx，观察在浏览器里面还能不能访问192.168.1.200，如果能访问且页面跟上面访问页面一样，则说明我们的nginx+keepalived搭建成功，当然我们也需要去观察105的日志文件：

以上说明：我们搭建的nginx+keepalived高可用web服务器完成。
如果你看到这，是对我最大的褒奖，希望你能给宝贵的建议。谢谢。

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