自己搭建的图片服务器，有图片缩放的需求，大致思路是可以使用nginx调用lua，使用GraphicMagick的命令来做图片缩放

说明

文件夹规划

lua.jaychang.cn(如/var/filebase)

jaychang@nginx:~$ tree /var/filebase/
/var/filebase/
├── avatar.png
├── cache
│   └── thumb
│       ├── avatar.png_100x100.png
│       └── upload
│           ├── 1.png_100x100.png #固定高和宽
│           ├── 1.png_400-.png # 定高
│           └── 1.png_800-.png # 定宽
└── upload
    ├── 1.png
4 directories, 8 files

其中img.xyz.com为图片站点根目录
cache/thumb为缩略图存放目录
upload目录存放上传的图片

链接地址对应关系

原图访问地址：http://img.xyz.com/upload/1.png
缩略图访问地址：http://img.xyz.com/upload/1.png_100x100.png 即为宽100,高100
自动宽地址: http://img.xyz.com/upload/1.png_-400.png 用”-“表示自动,即为高400,宽自动
自动高地址: http://img.xyz.com/upload/1.png_800-.jpg 用”-“表示自动,即为宽800,高自动

访问流程

首先判断缩略图是否存在，如存在则直接显示缩略图；
缩略图不存在,则判断原图是否存在，如原图存在则拼接graphicsmagick(gm)命令,生成并显示缩略图,否则返回404

所需软件

lua-5.3.5.tar.gz
LuaJIT-2.0.5.tar.gz
nginx-1.14.2.tar.gz
nginx模块：lua-nginx-module-0.10.15.tar.gz

lua-nginx-module 依赖于 LuaJIT 和 ngx_devel_kit。LuaJIT 需要安装，ngx_devel_kit 只需下载源码包，在 Nginx 编译时指定 ngx_devel_kit 目录
nginx模块：nginx-http-concat
nginx模块：ngx_devel_kit
nginx模块：nginx-http-concat

curl -R -O http://www.lua.org/ftp/lua-5.3.5.tar.gz
curl -R -O http://luajit.org/download/LuaJIT-2.0.5.tar.gz
curl -R -O http://nginx.org/download/nginx-1.14.2.tar.gz
curl -R -O https://github.com/openresty/lua-nginx-module/archive/v0.10.15.tar.gz
curl -R -O https://github.com/openresty/lua-resty-core/archive/v0.1.17.tar.gz
curl -R -O https://github.com/simpl/ngx_devel_kit/archive/v0.3.0.tar.gz
git clone git@github.com:alibaba/nginx-http-concat.git

安装依赖

1
2
3

apt-get install -y gcc g++ make

apt-get install libreadline-dev libpcre3 libpcre3-dev openssl libssl-dev zlib1g zlib1g-dev libgeoip-dev -y

编译安装Lua LuaJIT

编译安装Lua

curl -R -O http://www.lua.org/ftp/lua-5.3.5.tar.gz
tar zxf lua-5.3.5.tar.gz
cd lua-5.3.5
make linux test

编译安装LuaJIT

curl -R -O http://luajit.org/download/LuaJIT-2.0.5.tar.gz
tar -zxvf LuaJIT-2.0.5.tar.gz
cd LuaJIT-2.0.5
make -j2 && make install
export LUAJIT_LIB=/usr/local/lib
export LUAJIT_INC=/usr/local/include/luajit-2.0
echo "/usr/local/lib" > /etc/ld.so.conf.d/usr_local_lib.conf
ldconfig

安装GraphicsMagick

1	apt install -y graphicsmagick

直接用apt来安装的话，可以免去安装 jpg,png 等图片库依赖

创建用户及相应目录

groupadd nginx && useradd nginx -g nginx -s /sbin/nologin -M

mkdir -p /var/tmp/nginx/client_body_temp
mkdir -p /var/tmp/nginx/uwsgi_temp

创建用户也可以用以下命令：

1	groupadd nginx && useradd nginx -g nginx -s /bin/false -M

编译安装nginx

./configure --prefix=/usr/local/nginx 
--user=nginx --group=nginx 
--sbin-path=/usr/sbin/nginx 
--with-pcre 
--with-http_realip_module 
--with-http_gzip_static_module 
--with-http_stub_status_module 
--with-http_v2_module 
--with-http_flv_module 
--with-http_ssl_module 
--with-http_addition_module 
--with-http_geoip_module 
--add-module=/usr/local/src/lua-nginx-module-0.10.15 
--add-module=/usr/local/src/ngx_devel_kit-0.3.0 
--add-module=/usr/local/src/nginx-http-concat 
--http-scgi-temp-path=/var/tmp/nginx/cgi_temp 
--http-client-body-temp-path=/var/tmp/nginx/client_body_temp 
--http-proxy-temp-path=/var/tmp/nginx/proxy_temp 
--http-uwsgi-temp-path=/var/tmp/nginx/uwsgi_temp 
--http-fastcgi-temp-path=/var/tmp/nginx/fastcgi_temp 
--http-log-path=/var/log/nginx/access.log 
--error-log-path=/var/log/nginx/error.log

1	make -j 2 && make install

注意：动态加载模块，Nginx官方的load_module指令,详细文档参考1
和参考2
还有–with-http_spdy_module 已经改为–with-http_v2_module了
,如果不用geo的话，编译的时候可以不加–with-http_geoip_module，可以不安装libgeoip-dev

测试nginx

nginx -t

如果出现以下错误(没有报错就不用做以下操作了)

1 2	root@ubuntu:/usr/local/src/nginx-1.14.2# nginx -t nginx: error while loading shared libraries: libluajit-5.1.so.2: cannot open shared object file: No such file or directory

执行以下命令即可

1 2	echo "/usr/local/lib" > /etc/ld.so.conf.d/usr_local_lib.conf ldconfig

修改nginx.conf配置文件

将nginx.conf配置文件中的server{}段配置注释掉

加一行配置，以便读取/usr/local/tengine/conf.d目录下所有后缀为.conf的配置文件

1	include ../conf.d/*.conf;

可以参考如下配置

user nginx;
worker_processes 4;
worker_cpu_affinity 1000 0100 0010 0001;
error_log /var/log/nginx/error.log error;
pid /usr/local/nginx/logs/nginx.pid;
worker_rlimit_nofile 65535;
events
{
	use epoll;
	worker_connections 65535;
}
http
{
   lua_load_resty_core off;
   limit_conn_zone $binary_remote_addr zone=one:10m;
   limit_conn_zone $server_name zone=perserver:10m;
	include mime.types;
	include fastcgi.conf;
	default_type application/octet-stream;
	charset utf-8;
	server_names_hash_bucket_size 128;
	client_header_buffer_size 32k;
	large_client_header_buffers 4 64k;
	sendfile on;
	autoindex off;
	tcp_nopush on;
	tcp_nodelay on;
	keepalive_timeout 120;
    
	fastcgi_connect_timeout 60;
	fastcgi_send_timeout 60;
	fastcgi_read_timeout 60;
	fastcgi_buffer_size 128k;
	fastcgi_buffers 8 128k;
	fastcgi_busy_buffers_size 128k;
	fastcgi_temp_file_write_size 128k;
    
	gzip on;
	gzip_min_length 1k;
	gzip_buffers 4 16k;
	gzip_http_version 1.0;
	gzip_comp_level 2;
	gzip_types text/plain application/x-javascript text/css application/xml;
	gzip_vary on;

	log_format main '$remote_addr - $remote_user [$time_local] "$request" '
	'$status $body_bytes_sent "$http_referer" '
	'"$http_user_agent" $http_x_forwarded_for';

	client_max_body_size 10m;

	include ../conf.d/*.conf;
}

注意：lua_load_resty_core off;如果不加会有以下错误

nginx: [alert] detected a LuaJIT version which is not OpenResty's; many optimizations will be disabled and performance will be compromised (see https://github.com/openresty/luajit2 for OpenResty's LuaJIT or, even better, consider using the OpenResty releases from https://openresty.org/en/download.html)
nginx: [error] lua_load_resty_core failed to load the resty.core module from https://github.com/openresty/lua-resty-core; ensure you are using an OpenResty release from https://openresty.org/en/download.html (rc: 2, reason: module 'resty.core' not found:
        no field package.preload['resty.core']
        no file ' /usr/local/lib/lua-resty-core-0.1.17/lib/resty/core.lua'
        no file './resty/core.lua'
        no file '/usr/local/share/luajit-2.0.5/resty/core.lua'
        no file '/usr/local/share/lua/5.1/resty/core.lua'
        no file '/usr/local/share/lua/5.1/resty/core/init.lua'
        no file './resty/core.so'
        no file '/usr/local/lib/lua/5.1/resty/core.so'
        no file '/usr/local/lib/lua/5.1/loadall.so'
        no file './resty.so'
        no file '/usr/local/lib/lua/5.1/resty.so'
        no file '/usr/local/lib/lua/5.1/loadall.so')

创建放图片的目录

目录规划

/var/www 放网页,css,js等资源
/var/fielbase 放图片
/var/filebase/upload 上传的图片放这里

1
2
3

mkdir -p /var/filebase/upload 
mkdir -p /var/filebase/cache/thumb
chown -R nginx:nginx /var/filebase

配置站点配置文件

在/usr/local/tengine/conf.d目录下创建demo.conf

# 定义lua缩略图支持的图片尺寸及开关
init_by_lua '
    image_sizes_check = true
    image_sizes = {"800x800", "400x400","200x200","100x100", "-800", "-400", "-200","-100", "800-", "400-", "200-","100-"}
';

server {
    listen   80;
    servername img.xyz.com;
    index index.php index.html index.htm;

    set $root_path '/var/www';
    root $root_path;

   # /lua仅用于测试，可去掉
	 location /lua {
		default_type 'text/plain';
        content_by_lua 'ngx.say("hello, ttlsa lua")';
    }
    
    # 这里也是需要根据实际情况修改的，这里的是用了rewrite
    location / {
        try_files $uri $uri/ /index.php?$args;

        # add support for img which has query params,
        # like:  xxx.jpg?a=b&c=d_750x750.jpg
        if ($args ~* "^([^_]+)_(d+)+x(d+)+.(jpg|jpeg|gif|png)$") {
            set $w $2;
            set $h $3;
            set $img_ext $4;

            # rewrite ^?(.*)$ _${w}x${h}.$img_ext? last;
            rewrite ([^.]*).(jpg|jpeg|png|gif)$  $1.$2_${w}x${h}.$img_ext? permanent;
        }
    }

    # set var for thumb pic
    set $upload_path /var/filebase;
    set $img_original_root  $upload_path;# original root;
    set $img_thumbnail_root $upload_path/cache/thumb;
    set $img_file $img_thumbnail_root$uri;

    # like：/xx/xx/xx.jpg_100-.jpg or /xx/xx/xx.jpg_-100.jpg
    location ~* ^(.+.(jpg|jpeg|gif|png))_((d+-)|(-d+)).(jpg|jpeg|gif|png)$ {
            root $img_thumbnail_root;    # root path for croped img
            set $img_size $3;

            if (!-f $img_file) {    # if file not exists
                    add_header X-Powered-By 'Nginx+Lua+GraphicsMagick By Botao';  #  header for test
                    add_header file-path $request_filename;    #  header for test
                    set $request_filepath $img_original_root$1;    # origin_img full path：/document_root/1.gif
                    set $img_size $3;    # img width or height size depends on uri
                    set $img_ext $2;    # file ext
                    content_by_lua_file /usr/local/nginx/lua/autoSize.lua;    # load lua
            }
    }

    # like: /xx/xx/xx.jpg_100x100.jpg
    location ~* ^(.+.(jpg|jpeg|gif|png))_(d+)+x(d+)+.(jpg|jpeg|gif|png)$ {
            root $img_thumbnail_root;    # root path for croped img

            if (!-f $img_file) {    # if file not exists
                    add_header X-Powered-By 'Nginx+Lua+GraphicsMagick By Botao';  #  header for test
                    add_header file-path $request_filename;    #  header for test
                    set $request_filepath $img_original_root$1;    # origin_img file path
                    set $img_width $3;    # img width
                    set $img_height $4;    # height
                    set $img_ext $5;    # file ext
                    content_by_lua_file /usr/local/nginx/lua/cropSize.lua;    # load lua
            }
    }

    # if need (all go there)
    location ~* /upload {
            root $img_original_root;
    }


    location ~ /.ht {
        deny all;
    }
}

lua脚本

/usr/local/tengine/lua/autoSize.lua

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文章作者: 安全书
文章链接: https://lua.ren/zl/2016-01-01-602_Ubuntu18.04%20Nginx+Lua+GraphicsMagick%E5%9B%BE%E7%89%87%E7%BC%A9%E6%94%BE/
版权声明: 本博客所有文章除特别声明外，均采用 null 许可协议。转载请注明来自 安全书！
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目录
1. 说明1.1. 文件夹规划
1.2. 链接地址对应关系
1.3. 访问流程
2. 所需软件
3. 安装依赖
4. 编译安装Lua LuaJIT4.1. 编译安装Lua
4.2. 编译安装LuaJIT
5. 安装GraphicsMagick
6. 创建用户及相应目录
7. 编译安装nginx
8. 测试nginx
9. 修改nginx.conf配置文件
10. 创建放图片的目录
11. 配置站点配置文件
12. lua脚本
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