Nginx安装http_image_filter_module图片裁剪模块

http_image_filter_module用来裁剪图片的,是nginx自带模块,默认不会开启
开启该模块需要在编译时要带上参数 --with-http_image_filter_module
这里比如在tomcat服务器下放个 test 目录存放图片,则可以 http://ip:8080/test/234241.jpg 这样访问图片,安装裁剪模块后可以 http://ip:8080/test/234241_100x100_80.jpg 自动裁剪原图。

image_filter_module 没有真正生成裁剪/缩放后的图片,而是通过 Nginx 直接输出的,这样每次请求或缓存过期后都需要重新裁剪/缩放,会增加 Nginx 负担

需要下载的软件及模块:nginx-1.10.1.tar.gz,LuaJIT-2.0.3.tar.gz,pcre-8.35.tar.gz

yum安装nginx依赖模块

pcre为了重写rewrite, zlib为了gzip压缩

yum -y install make zlib zlib-devel gcc-c++ libtool openssl openssl-devel gd-devel

编译安装LuaJIT

tar zxvf LuaJIT-2.0.3.tar.gz
sudo make && make install

配置变量

vi /etc/profile
export LUAJIT_LIB=/usr/local/lib
export LUAJIT_INC=/usr/local/include/luajit-2.0

执行下面命令

echo "/usr/local/lib" > /etc/ld.so.conf.d/usr_local_lib.conf
ldconfig

编译安装 nginx

将pcre-8.35.tar.gz放到 /usr/local下解压

tar zxvf pcre-8.35.tar.gz
tar zxvf nginx-1.10.1.tar.gz
cd nginx-1.10.1  
./configure --prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_module --with-http_image_filter_module
 --with-pcre=/usr/local/pcre-8.35
make 
make install
make clean

文件配置

/usr/local/nginx/servers 新建文件 image.test.com

server
  {
    listen       80;
    server_name image.test.com;
    index index.html index.htm index.php;

    location / {

      proxy_pass http://ip:8080/test/;
    }

    //裁剪图片尺寸 filename_100x100.jpg
    location ~* .*_(\d+)x(\d+)\.(JPG|jpg|gif|png|PNG)$ {
        set $img_width $1;
        set $img_height $2;
        rewrite ^(.*)_\d+x\d+.(JPG|jpg|gif|png|PNG)$ /test$1.$2 break;
        image_filter resize $img_width $img_height;
        image_filter_buffer 10M;

        proxy_pass http://ip:8080;
    }

    //裁剪图片尺寸并压缩 filename_100x100_80.jpg
    location ~* .*_(\d+)x(\d+)_(\d+)\.(JPG|jpg|gif|png|PNG)$ {
        set $img_width $1;
        set $img_height $2;
        set $img_quality $3;
        rewrite ^(.*)_\d+x\d+_\d+.(JPG|jpg|gif|png|PNG)$ /test$1.$2 break;
        image_filter resize $img_width $img_height;
        image_filter_buffer 10M;
        image_filter_jpeg_quality $img_quality;

        proxy_pass http://ip:8080;
    }

}

image_filter_jpeg_quality :设置jpeg图片的压缩质量比例(官方最高建议设置到95,但平时75就可以了);

image_filter_buffer :限制图片最大读取大小,默认为1M;

image_filter_transparency:用来禁用gif和palette-based的png图片的透明度,以此来提高图片质量。

[参考资料]

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