Nginx+lua_Nginx+GraphicsMagick来实现实时缩略图

1、安装GraphicsMagick

cd /usr/local/src

wget http://sourceforge.net/projects/graphicsmagick/files/graphicsmagick/1.3.20/GraphicsMagick-1.3.20.tar.gz/download

tar -zxvf  GraphicsMagick-1.3.20.tar.gz

cd GraphicsMagick-1.3.20

./configure --prefix=/usr/local/GraphicsMagick

make && make install 

2、下载luajit

wget http://luajit.org/download/LuaJIT-2.0.2.tar.gz

tar -zxvf  LuaJIT-2.0.2.tar.gz

cd LuaJIT-2.0.2

 make && make install PREFIX=/usr/local/lj2

  ln -sf LuaJIT-2.0.2 /usr/local/lj2/bin/luajit 

3、下载  ngx_devel_kit 模块

wget https://github.com/simpl/ngx_devel_kit/archive/master.zip

unzip master.zip

4、下载 lua-nginx-module 模块

https://github.com/openresty/lua-nginx-module/archive/master.zip

unzip master.zip

5、下载echo

 https://github.com/agentzh/echo-nginx-module/zipball/master

unzip echo-nginx-module.zip  

6、下载cache

wget http://labs.frickle.com/files/ngx_cache_purge-2.1.tar.gz

tar -zxvf ngx_cache_purge-2.1.tar.gz

cd ngx_cache_purge-2.1

...

7、下载nginx

wget http://nginx.org/download/nginx-1.7.5.tar.gz
...

8、设置环境变量

export LUAJIT_LIB=/usr/local/lj2/lib

export LUAJIT_INC=/usr/local/lj2/include/luajit-2.0

export LD_LIBRARY_PATH=/usr/local/lib/:$LD_LIBRARY_PATH 

export  PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:$PKG_CONFIG_PATH

GM_HOME=/usr/local/GraphicsMagick;

PATH=$GM_HOME/bin:$PATH;

export PATH

export GM_HOME

source /etc/profile 

9、nginx 编译安装

--prefix=/usr/local/nginx  --with-http_stub_status_module --add-module=/usr/src/simpl-ngx_devel_kit --with-ld-opt=-Wl,-rpath,/usr/local/lj2/lib --add-module=/usr/src/ngx_cache_purge-2.1 --with-http_perl_module --add-module=/usr/local/src/lua-nginx-module --add-module=/usr/local/src/echo-nginx-module-master 

 如果编译有错，请把pcre扩展附加上

10、nginx配置

11、虚拟目录vhost

server {
        listen 80;
        server_name image.host.com;
        root /usr/local/nginx/html/test;
        index index.html index.htm index.php;

        location /lua1 {

            default_type 'text/plain';
            content_by_lua 'ngx.say("hello, lua")';
        }

         location  /image {

            set $image_root /usr/local/nginx/html/test;

            set $file "$image_root$uri";

            if (!-f $file) {
                        rewrite_by_lua '
                                local index = string.find(ngx.var.uri, "([0-9]+)x([0-9]+)");
                                if (index == nil) then
                                   ngx.exit(404);end;
                                local originalUri = string.sub(ngx.var.uri, 0, index-2);
                                local area = string.sub(ngx.var.uri, index);
                                index = string.find(area, "([.])");
                                area = string.sub(area, 0, index-1);
                                local image_sizes = {"160x160","400x300"};
                                local image_big = {"80x60^", "120x90^", "160x120^"};
                                function table.contains(table, element)
                                for _, value in pairs(table) do
                                        if value == element then
                                                return true
                                        end
                                end
                                return false
                        end
               # print(table.contains(image_big, area))
                if table.contains(image_big, area) then
                        local command = "/usr/local/GraphicsMagick/bin/gm convert " .. ngx.var.image_root ..  originalUri  .. " -thumbnail " .. area .. " -background gray -gravity center -extent " .. area .. " " .. ngx.var.image_root .. ngx.var.uri
                        os.execute(command);
                else
                        if table.contains(image_sizes, area) then
                        local command = "/usr/local/GraphicsMagick/bin/gm convert " .. ngx.var.image_root ..  originalUri  .. " -thumbnail "  .. area .. " " .. ngx.var.image_root .. ngx.var.uri;
                        os.execute(command);
                        else
                        ngx.exit(404);
                        end;
                end;
                ';
          }
          # alias /usr/local/nginx/html/test/image;

          expires 7d;
    }
}

12、赋予权限

chmod o+w /usr/local/nginx/html/test/image

13、访问

原地址：http://image.rose.com/image/2.jpg

缩略图地址：http://image.rose.com/image/2.jpg.400x300.jpg