現在随着各終端的出現(手機,ipad等平闆),以及各種終端的手機分辨率和尺寸都不同,現在手機使用者流量都是寶,網上出現了各種各樣的生成縮略圖功能的架構,有使用php實時生成縮略圖的,也有用nginx + lua實作的,上節我也講到了使用nginx生成縮略圖,但是使用者每次通路都需要生成一次,會給cpu和硬碟帶來比較大的壓力,今天帶來了另外一種方式,這次使用nginx将原圖生成縮略圖到硬碟上.看我的配置
1、首先建立好cache目錄
[[email protected] ~]# mkdir -p /data/stie_cache
[[email protected] ~]#
2、修改nginx配置,增加如下内容
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 $arg_height;
image_filter_jpeg_quality 75;
access_log off;
}
完整的nginx配置檔案如下:
[[email protected] conf]# cat nginx.conf
worker_processes 1;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
server {
listen 80;
server_name localhost;
location / {
root html;
index index.html index.htm;
image on;
image_output on;
}
location ~* ^/resize {
root /data/site_cache/$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;
}
}
}
[[email protected] conf]#
提示:
nginx編譯的時候要添加參數--with-http_image_filter_module,保險起見将子產品ngx_image_thumb-master也帶上,是以最終nginx編譯參數為:
./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、這個請求進入了location ~* ^/resize,接着判斷image_path這個目錄下是否存在這張圖檔,如果存在直接放回給使用者,
4、不存在那麼跳轉到http://10.0.0.10/image_resize/image/1.jpg?width=100&height=100;
5、location /image_resize根據傳入的width和height執行縮略功能,并且設定圖像品質為75
6、接着生成檔案到/data/site_cache/10.0.0.10/resize_100x100/image/1.jpg
7、并且傳回圖檔給使用者
8、nginx生成縮略圖到硬碟上的功能到這裡就結束了
本文轉自027ryan 51CTO部落格,原文連結: http://blog.51cto.com/ucode/1751605 ,如需轉載請自行聯系原作者