Nginx-Lua-FastDFS-GraphicsMagick动态图片缩略图
公司使用FastDFS来当作图片服务器，客户端通过Nginx请求图片。某些情况下，客户端对请求的图片有尺寸要求，
如http://10.100.1.145/group1/M00/00/18/CmQBkVsSjbiARQKhAAAHLpECb3c407.jpg_400x400.jpg。
这时我们可以使用GraphicsMagick工具动态的修改图片以满足客户端的需求。
这里使用lua脚本，调用GraphicsMagick的gm命令动态处理图片。
FastDFS+Nginx的安装配置步骤请见：/danielzhou888/article/details/80563355
安装包来源请自行百度，谢谢。
整体思路:
1、首先服务器需要有lua环境
2、Nginx扩展支持lua，可调用lua脚本
3、lua脚本中定义gm命令及参数
安装配置:
1、安装lua环境
tar zxvf LuaJIT-2.0.2.tar.gz
cd LuaJIT-2.0.2
make && make install
2、配置lua环境变量
export LUAJIT_LIB=/usr/local/lib
export LUAJIT_INC=/usr/local/include/luajit-2.0
3、安装GraphicsMagick
tar zxvf GraphicsMagick-1.3.21.tar.gz
cd GraphicsMagick
./configure –prefix=/data/local/GraphicsMagick –enable-shared
make && make install
查看GraphicsMagick 支持的文件类型:
/data/local/GraphicsMagick/bin/gm -version
Feature Support:
Native Thread Safe yes
Large Files (> 32 bit) yes
Large Memory (> 32 bit) yes
BZIP yes
DPS no
FlashPix no
FreeType no
Ghostscript (Library) no
JBIG no
JPEG-2000 no
JPEG yes
Little CMS no
Loadable Modules no
OpenMP yes (07)
PNG yes
TIFF no
TRIO no
UMEM no
WebP no
WMF no
X11 no
XML no
ZLIB yes
Host type: x86_64-unknown-linux-gnu
若PNG、JPEG等不支持，可以在编译GraphicsMagick的时候，使用 –with-png=yes
4、准备lua模块
ngx_devel_kit-0.2.18.tar.gz
v0.8.6.tar.gz（lua-nginx-module-0.8.6
5、安装Nginx
tar zxvf nginx-1.4.2.tar.gz
cd nginx-1.4.2
./configure —prefix=/usr/local/nginx —add-module=lua-nginx-module-0.8.6 —add-module=ngx_devel_kit-0.2.18
make && make install
测试nginx扩展lua是否正常:
location /test {
default_type text/html;
content_by_lua ’
ngx.say(“hello world”)
ngx.log(ngx.ERR,”err err”)
‘;
}
若返回hello world即说明正常
6、启动Nginx
若出错，如/usr/local/nginx/sbin/nginx: error while loading shared libraries: libluajit-5.1.so.2: cannot open shared object file: No such file or directory
请按如下操作:
find / -name libluajit-5.1.so.2
ln -s /usr/local/lib/libluajit-5.1.so.2 /usr/lib64/libluajit-5.1.so.2
7、lua脚本ImageResizer.lua
local command = “/data/local/GraphicsMagick/bin/gm convert ” .. ngx.var.request_filepath .. ” -resize ” .. ngx.var.width .. “x” .. ngx.var.height .. ” +profile \”*\” ” .. ngx.var.request_filepath .. “_” .. ngx.var.width .. “x” .. ngx.var.height .. “.” ..
ngx.var.ext;os.execute(command);
ngx.exec(ngx.var.request_uri);
Nginx配置请见nginx.conf
user root;worker_processes 1;#error_log logs/error.log;#error_log logs/error.log notice;#error_log logs/error.log info;#pid logs/nginx.pid;events {worker_connections 1024;}http {include mime.types;default_type application/octet-stream;log_format main '$remote_addr - $remote_user [$time_local] "$request" ''$status $body_bytes_sent "$http_referer" ''"$http_user_agent" "$http_x_forwarded_for"';#access_log logs/access.log main;sendfile on;#tcp_nopushon;#keepalive_timeout 0;keepalive_timeout 65;#gzip on;lua_package_path "/usr/local/nginx/conf/lua/?.lua;;";server {listen 80;server_name localhost;location /group1/M00 {root /home/fastdfs/fastdfs_storage_data/data;if ($uri ~* ^/group1/M00(.+\.(jpg|jpeg|gif|png))_(\d+)x(\d+)\.(jpg|jpeg|gif|png)) { add_header X-Powered-By 'Lua GraphicsMagick';add_header file-path $request_filename;lua_code_cache on;set $request_filepath /home/fastdfs/fastdfs_storage_data/data$1;set $width $3;set $height $4;set $ext $5;}if (!-f $request_filename) {content_by_lua_file conf/lua/ImageResizer.lua;}}}# another virtual host using mix of IP-, name-, and port-based configuration##server {# listen 8000;# listen somename:8080;# server_name somename alias another.alias;# location / {# root html;# index index.html index.htm;# }#}# HTTPS server##server {# listen 443 ssl;# server_name localhost;# ssl_certificatecert.pem;# ssl_certificate_key cert.key;# ssl_session_cache shared:SSL:1m;# ssl_session_timeout 5m;# ssl_ciphers HIGH:!aNULL:!MD5;# ssl_prefer_server_ciphers on;# location / {# root html;# index index.html index.htm;# }#}}
lua配置请见ImageResizer.lua
if(ngx.var.height ~= '' and ngx.var.width ~= '') thenheight = tonumber(ngx.var.height);width = tonumber(ngx.var.width);if(height > 1000) thenheight = 1000endif(width > 1000) thenheight = 1000endlocal command = "/usr/local/GraphicsMagick/bin/gm convert " .. ngx.var.request_filepath .. " -resize " .. width .. "x" .. height .. " +profile \"*\" " .. ngx.var.request_filepath .. "_" .. ngx.var.width .. "x" .. ngx.var.height .. "." .. ngx.var.ext;os.execute(command);ngx.exec(ngx.var.request_uri);elsengx.exit(ngx.HTTP_NOT_FOUND);end
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