正在生产线上跑着web前端是nginx+tomcat,现在有这样一个需求，需要对网站的单品页面和列表页设置缓存，不同的页面设置不同的缓存，但是由于开始没有安装ngx_cache_purge这个模块，现在没法直接往配置文件里边写，这时候，就需要在线安装ngx_cache_purge此模块，下边就说下怎么在线编译安装新模块。
安装步骤：
1.首先看下内核和系统的版本号。
[root@vmware1 ~]# uname -a
Linux vmware1 2.6.18-308.el5 #1 SMP Tue Feb 21 20:06:06 EST 2012 x86_64 x86_64 x86_64 GNU/Linux
[root@vmware1 ~]# lsb_release -a
LSB Version: :core-4.0-amd64:core-4.0-ia32:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-ia32:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-ia32:printing-4.0-noarch
Distributor ID: CentOS
Description: CentOS release 5.8 (Final)
Release: 5.8
Codename: Final
2.看下编译安装nginx的时候，都编译安装的哪些模块。
[root@vmware1 ~]# /usr/local/nginx/sbin/nginx -V
nginx version: nginx/1.3.1
built by gcc 4.1.2 20080704 (Red Hat 4.1.2-54)
TLS SNI support disabled
configure arguments: –user=nginx –group=nginx –prefix=/usr/local/nginx-1.3.1 –with-http_stub_status_module –with-http_ssl_module –with-pcre=/taokey/tools/pcre-8.33
3.下载proxy_cache所需的压缩包ngx_cache_purge-2.1.tar.gz。
[root@vmware1 tools]# wget http://labs.frickle.com/files/ngx_cache_purge-2.1.tar.gz
–2013-09-29 11:02:19进到– http://labs.frickle.com/files/ngx_cache_purge-2.1.tar.gz
Resolving labs.frickle.com… 5.9.135.91
Connecting to labs.frickle.com|5.9.135.91|:80… connected.
HTTP request sent, awaiting response… 200 OK
Length: 10535 (10K) [application/octet-stream]
Saving to: `ngx_cache_purge-2.1.tar.gz’
100%[==========================================================================================>] 10,535 –.-K/s in 0s
2013-09-29 11:02:21 (64.8 MB/s) – `ngx_cache_purge-2.1.tar.gz’ saved [10535/10535]
4.解压下载好的ngx_cache_purge-2.1.tar.gz这个压缩包
[root@vmware1 tools]# tar -xf ngx_cache_purge-2.1.tar.gz
5.进到之前安装nginx这个软件包的目录
1 [root@vmware1 nginx-1.3.1]# cd /taokey/tools/nginx-1.3.1
6.重新./configure,make编译，不用make install。千万要注意：到这里就可以了，千万不要make install，不然文件就会被覆盖了。
[root@vmware1 nginx-1.3.1]# ./configure –user=nginx –group=nginx –add-module=../ngx_cache_purge-2.1 –prefix=/usr/local/nginx-1.3.1 –with-http_stub_status_module –with-http_ssl_module –with-pcre=/taokey/tools/pcre-8.33
[root@vmware1 nginx-1.3.1]# make
7.需要替换nginx二进制文件,先备份一下原来的启动脚本。
[root@vmware1 nginx-1.3.1]# cp /usr/local/nginx/sbin/nginx /usr/local/nginx/sbin/nginx.bak
8.需要把nginx进程杀掉，不然复制会报错
[root@vmware1 nginx-1.3.1]# killall nginx
[root@vmware1 nginx-1.3.1]# killall nginx
nginx: no process killed
[root@vmware1 nginx-1.3.1]# cp ./objs/nginx /usr/local/nginx/sbin/
cp: overwrite `/usr/local/nginx/sbin/nginx’? yes
9.此时，查看下nginx的所有的模块，是否把cache_purge这个模块成功编译进去。
[root@vmware1 nginx-1.3.1]# /usr/local/nginx/sbin/nginx -V
nginx version: nginx/1.3.1
built by gcc 4.1.2 20080704 (Red Hat 4.1.2-54)
TLS SNI support disabled
configure arguments: –user=nginx –group=nginx –add-module=../ngx_cache_purge-2.1 –prefix=/usr/local/nginx-1.3.1 –with-http_stub_status_module –with-http_ssl_module –with-pcre=/taokey/tools/pcre-8.33
10.开启nginx.
[root@vmware1 nginx-1.3.1]# /usr/local/nginx/sbin/nginx
[root@vmware1 nginx-1.3.1]# netstat -anpt | grep nginx
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 6205/nginx
到此为止，实验结束。