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Nginx生成縮略圖并存儲到硬盤上

更新時間：2016年03月16日 13:46:46 作者：027ryan

這篇文章主要介紹了Nginx生成縮略圖并存儲到硬盤上的相關(guān)資料,需要的朋友可以參考下

現(xiàn)在隨著各終端的出現(xiàn)(手機(jī)，ipad等平板),以及各種終端的手機(jī)分辨率和尺寸都不同，現(xiàn)在手機(jī)用戶流量都是寶,網(wǎng)上出現(xiàn)了各種各樣的生成縮略圖功能的架構(gòu)，有使用php實時生成縮略圖的，也有用nginx + lua實現(xiàn)的，上節(jié)我也講到了使用nginx生成縮略圖，但是用戶每次訪問都需要生成一次，會給cpu和硬盤帶來比較大的壓力，今天帶來了另外一種方式，這次使用nginx將原圖生成縮略圖到硬盤上.看我的配置

1、首先創(chuàng)建好cache目錄

[root@masterserver ~]# mkdir -p /data/stie_cache 
[root@masterserver ~]#

2、修改nginx配置，增加如下內(nèi)容

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;
}

完整的nginx配置文件如下:

[root@masterserver conf]# cat nginx.conf
worker_processes 1;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
server {
listen 80;
server_name localhost;
location / {
root html;
index index.html index.htm;
image on;
image_output on;
}
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;
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
}
[root@masterserver conf]#

提示:

nginx編譯的時候要添加參數(shù)--with-http_image_filter_module，保險起見將模塊ngx_image_thumb-master也帶上，所以最終nginx編譯參數(shù)為:

./configure --add-module=../ngx_image_thumb-master/ --with-http_image_filter_module

生成縮略圖流程如下：

1、原圖在http://10.0.0.10/image/1.jpg。我需要一份100x100的縮略圖。

2、請求http://10.0.0.10/resize_100x100/image/1.jpg.

3、這個請求進(jìn)入了location ~* ^/resize,接著判斷image_path這個目錄下是否存在這張圖片,如果存在直接放回給用戶,

4、不存在那么跳轉(zhuǎn)到http://10.0.0.10/image_resize/image/1.jpg?width=100&height=100;

5、location /image_resize根據(jù)傳入的width和height執(zhí)行縮略功能,并且設(shè)置圖像質(zhì)量為75

6、接著生成文件到/data/site_cache/10.0.0.10/resize_100x100/image/1.jpg

7、并且返回圖片給用戶

8、nginx生成縮略圖到硬盤上的功能到這里就結(jié)束了