nginx实时生成缩略图到硬盘上

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所属分类：Nginx

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

# mkdir /data/site_cache/

1	# mkdir /data/site_cache/

2. 修改nginx配置

        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;
        }

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
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