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：
http://blog.运维网.com/attachment/201205/092208915.png
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/ && tar xzvf ipvsadm-1.24.tar.gz &&cd ipvsadm-1.24
[*] && make && make install
[*] cd /usr/src/&&tar -xzvf keepalived-1.1.15.tar.gz&&
[*] cd keepalived-1.1.15&& ./configure&&make&&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 {
[*] wgkgood@163.com
[*] }
[*] notification_email_from wgkgood@163.com
[*] 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 {
[*] weight 100
[*] TCP_CHECK {
[*] connect_timeout 10
[*] nb_get_retry 3
[*] delay_before_retry 3
[*] connect_port 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 &&chown -R squid:squid /data/squid/
[*] 2、设置squid日志路径:
[*] mkdir -p /data/logs/squid/ && 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：
http://blog.运维网.com/attachment/201205/181342874.png
三、Nginx安装
分别在192.9.117.143、192.9.117.144安装nginx，并配置好相应的测试页面,最后访问LVS-vip结果如下 http://192.9.117.145/
http://blog.运维网.com/attachment/201205/181036690.png
查看lvs转发状态
http://blog.运维网.com/attachment/201205/181141988.jpg
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