安装
安装lua LuaJIT
ln -s /usr/local/lib/libluajit-5.1.so.2 /lib64/libluajit-5.1.so.2 设置软连接，不然配置nginx会报错
安装 GraphicsMagick
安装 nginx
--with-ld-opt=-Wl,-rpath,/user/local/lib --add-module=/opt/download/ngx_devel_kit-0.3.0 --add-module=/opt/download/lua-nginx-module-0.10.7
配置
//http://lua.img.com:9876/image/1.png.400x300.png
location /image {
root /opt/project/lua.img.com;
set $image_root /opt/project/lua.img.com;
set $file "$image_root$uri";
//ngx.var.file=/opt/project/lua.img.com/iamge/1.png.400x300.png
//图片存在 直接返回 图片不存在处理保存并返回结果
if (!-f $file) {
rewrite_by_lua '
ngx.var.uri=image/1.png.400x300.png
local index = string.find(ngx.var.uri, "([0-9]+)x([0-9]+)");
//index= 13
if (index == nil) then
ngx.exit(404);end;
local originalUri = string.sub(ngx.var.uri, 0, index-2);
//originxUri=image/1.png
local area = string.sub(ngx.var.uri, index);
//area=400x300.png
index = string.find(area, "([.])");
//index=7
area = string.sub(area, 0, index-1);
//area=400x300
print(area)
local image_sizes = {"160x160","400x300"};
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_sizes,area))
if table.contains(image_sizes, area) then
//调用gm 处理
//ngx.var.image_root = /opt/project/lua.img.com
//originalUri = image/1.png
//area = 400x300
//ngx.var.uri= image/1.png.400x300.png
local command = "/opt/software/GraphicsMagick/bin/gm convert " ..ngx.var.image_root .. originalUri .. " -thumbnail " .. area .. " ".. ngx.var.image_root .. ngx.var.uri;
print(command)
local ret=os.execute(command);
else
ngx.exit(404);
end;
';
}
expires 7d;
}
问题
在测试过程中，出现了一个问题，command = “gm convert “ ..ngx.var.image_root .. originalUri .. “ -thumbnail “ .. area .. “ “.. ngx.var.image_root .. ngx.var.uri;原本这里的gm是全局的指令，这样设定的时候，在nginx日志中能看到流程处理了，command命令没有执行成功。这里调试了很久，修改为/opt/software/GraphicsMagick/bin/gm就可以了。
nginx.conf user root root 确保对文件具有读写权限