nginx实时生成缩略图到硬盘上

现在随着各终端的出现(手机，ipad等平板),以及各种终端的手机分辨率和尺寸都不同，现在手机用户流量都是宝,网上出现了各种各样的生成缩略图功能的架构，有使用php实时生成缩略图的，也有用nginx + lua实现的，上节我也讲到了使用nginx生成缩略图，但是用户每次访问都需要生成一次，会给cpu和硬盘带来比较大的压力，今天带来了另外一种方式，这次使用nginx将原图生成缩略图到硬盘上.看我的配置

1. 首先建好cache目录

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1	# mkdir /data/site_cache/

2. 修改nginx配置

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location ~* ^/resize{                 root/data/site_cache/$server_name;                 set$width 150;                 set$height 100;                 set$dimens"";                   if($uri ~*"^/resize_(\d+)x(\d+)/(.*)") {                         set$width $1;                         set$height $2;                         set$image_path $3;                         set$demins"_$1x$2";                 }                   if($uri ~*"^/resize/(.*)") {                         set$image_path $1;                 }                   set$image_uri image_resize/$image_path?width=$width&height=$height;                   if(!-f $request_filename) {                         proxy_pass http://127.0.0.1/$image_uri;                         break;                 }                 proxy_store/data/site_cache/$server_name/resize$demins/$image_path;                 proxy_store_access user:rw group:rw all:r;                 proxy_set_header Host $host;                 expires      30d;                 access_log off;         }           location/image_resize{                 alias/data/site/$server_name/;                 image_filter resize $arg_width $arg_height;                 image_filter_jpeg_quality 75;                 access_log off;         }

生成缩略图流程如下：
1、原图在www.ttlsa.com/image/1.jpg。我需要一份100x100的缩略图。
2、请求www.ttlsa.com/resize_100x100/image/1.jpg.
3、这个请求进入了location ~* ^/resize,接着判断image_path这个目录下是否存在这张图片,如果存在直接放回给用户,
4、不存在那么跳转到http://www.ttlsa.com/image_resize/image/1.jpg?width=100&height=100;
5、location /image_resize根据传入的width和height执行缩略功能,并且设置图像质量为75
6、接着生成文件到/data/site_cache/www.ttlsa.com/resize_100x100/image/1.jpg
7、并且返回图片给用户
8、nginx生成缩略图到硬盘上的功能到这里就结束了