LVS+Keepalived+Squid+Nginx高可用负载均衡缓存配置

前言* 随着互联网IT行业的发展，越来越多的企业开始使用开源软件搭建自己的web架构，主流的LVS也得到了广泛的应用，在保证高可用的同时，用户对网站的体验速度也有了很高的要求，这时候需要我们在我们的架构既要满足高并发同时还要求高速度。 今天我们来搭建主流架构Lvs+Keepalived+Squid+Nginx

实施环境及相关软件：

系统：CentOS6.0 x64      

Ipvsadm：ipvsadm-1.24.tar.gz      

Keepalived：keepalived-1.1.15.tar.gz      

Squid：squid-3.1.10        

Nginx：nginx-1.2.0.tar.gz      

Ip信息：      

Lvs-master 192.9.117.139      

Lvs-backup 192.9.117.140      

Lvs-vip    192.9.117.145      

Squid_1 192.9.117.141      

Squid_2 192.9.117.142      

Nginx_1 192.9.117.143      

Nginx_1 192.9.117.144

网络架构图：

<a href="http://blog.51cto.com/attachment/201205/092208915.png" target="_blank"></a>

一、Lvs+Keepalived安装

1、下载源码包  

cd /usr/src/  

wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz    

wget http://www.keepalived.org/software/keepalived-1.1.15.tar.gz  

2、建立软链接  

ln -s /usr/src/kernels/2.6.* /usr/src/linux  

3、安装ipvsadm、keepalived  

cd /usr/src/ &amp;&amp; tar xzvf ipvsadm-1.24.tar.gz &amp;&amp;cd ipvsadm-1.24  

&amp;&amp; make &amp;&amp; make install  

cd /usr/src/  &amp;&amp;  tar -xzvf keepalived-1.1.15.tar.gz  &amp;&amp;  

cd keepalived-1.1.15  &amp;&amp; ./configure  &amp;&amp;  make  &amp;&amp;  make install  

4、配置keepalived  

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

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

mkdir -p /etc/keepalived  

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

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

5、修改keepalived配置文件

vi /etc/keepalived/keepalived.conf，根据实际情况修改：

! Configuration File for keepalived  

global_defs {  

  notification_email {  

     [email protected]  

  }  

  notification_email_from [email protected]  

  smtp_server 127.0.0.1  

  smtp_connect_timeout 30  

  router_id LVS_DEVEL  

}  

# VIP1  

vrrp_instance VI_1 {  

   state MASTER //备份服务器改成BACKUP  

   interface eth0  

   lvs_sync_daemon_inteface eth0  

   virtual_router_id 51  

   priority 100 //备份服务器改成90  

   advert_int 5  

   authentication {  

       auth_type PASS  

       auth_pass 1111  

   }  

   virtual_ipaddress {  

       192.9.117.145 //VIP地址  

virtual_server 192.9.117.145 80 {  

   delay_loop 6  

   lb_algo rr //lvs算法  

   lb_kind DR  

  persistence_timeout 60  

protocol TCP  

   real_server 192.9.117.141 80 {  

       weight 100  

       TCP_CHECK {  

       connect_timeout 10  

       nb_get_retry 3  

       delay_before_retry 3  

       connect_port 80  

       }  

real_server 192.9.117.142 80 {  

同理Lvs_backup也如上安装，并修改参数，Lvs+keepalived配置完毕后，启动keepalived, /etc/init.d/keepalived start 即可！然后在squid_1、squid_2分别执行realserver.sh脚本

二、Squid安装

1、给squid指定单独的缓存目录:  

mkdir -p /data/squid &amp;&amp;chown -R squid:squid /data/squid/  

2、设置squid日志路径:  

mkdir -p /data/logs/squid/ &amp;&amp; chown -R squid:squid /data/logs/squid/  

3、安装squid  

yum install squid -y 即可。  

4、修改squid.conf配置文件，贴一个简单的squid部分配置文件  

####http port 2012 05 20  

http_port 0.0.0.0:80 vhost vport  

cache_peer 192.9.117.143 parent 80 0 no-digest no-query originserver  

cache_peer 192.9.117.144 parent 80 0 no-digest no-query originserver  

cache_mem 2048 MB  

maximum_object_size_in_memory 4096 KB  

cache_dir aufs /data/squid 4000 16 512  

coredump_dir /data/squid  

启动squid /etc/init.d/squid start 即可！  

配置完两台squid并启动。并且都可以看到lo:0接口ip地址为VIP地址：  

<a href="http://blog.51cto.com/attachment/201205/181342874.png" target="_blank"></a>

三、Nginx安装

<a href="http://blog.51cto.com/attachment/201205/181036690.png" target="_blank"></a>

查看lvs转发状态

<a href="http://blog.51cto.com/attachment/201205/181141988.jpg" target="_blank"></a>

本文转自 wgkgood 51CTO博客，原文链接:http://blog.51cto.com/wgkgood/871717