GraphicsMagick + lua + nginx + linux生成动态压缩图
GraphicsMagick 安装：
a.下载GraphicsMagick-1.3.20.tar.gz文件，自行官网
b.解压文件
tar zxvf GraphicsMagick-1.3.20.tar.gz
c.编译
./configure
d.安装
make make install
e.设置环境变量
GM_HOME=/usr/local/GraphicsMagick; PATH=$GM_HOME/bin:$PATH; export PATH export GM_HOME
f.测试
source /etc/profile gm
如果出来东西，说明安装成功。注：确保安装的组件都已经装好，最后通过gm convert 之后，在查看选项中是否有-thumbnail。因为有一次源码装完，发现这个组件没有被安装上去，因此无法使用图片压缩
2.Lua 安装
这安装方法和上面的差不多。那我就不写了。也可以自己搜下百度
3.Nginx的相关配置
a.nginx.conf
server_names_hash_bucket_size 128; client_header_buffer_size 32k; large_client_header_buffers 4 128k; sendfile on; tcp_nopush on; keepalive_timeout 60; open_file_cache max=102400 inactive=20s; open_file_cache_min_uses 1; open_file_cache_valid 30s; tcp_nodelay on; 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; #APP服务 include /usr/local/nginx/conf/wa-app.conf; log_format access '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" $http_x_forwarded_for $request_body'; access_log /var/log/nginx/access.log access; #这里值的时日志输出的地方 }
b.wa-app.conf
#APP服务
upstream wa-app
{
server 127.0.0.1:8080 weight=1 max_fails=2 fail_timeout=10s;
server 127.0.0.1:8081 weight=1 max_fails=2 fail_timeout=10s;
}
server
{
listen 80;
server_name localhost;
# add_header X-Frame-Options "SAMEORIGIN";
location /
{
proxy_pass #这里的wa-app 指向的是upstream的wa-app
proxy_redirect off;
proxy_set_header Host $host:$server_port;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
client_max_body_size 32m;
client_body_buffer_size 128k;
proxy_connect_timeout 90;
proxy_send_timeout 90;
proxy_read_timeout 90;
proxy_buffer_size 4k;
proxy_buffers 4 32k;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k;
}
location ~* ^.+.(ico|map|less|gif|ttf|woff|svg|eot|bmp|jpg|jpeg|png|null|temp)$
{
root /var/www/wa-app/web/ROOT; #指向项目跟目录
#valid_referers none blocked server_names *.wa.com;
#if ($invalid_referer)
#{
# return 403;
#}
set $image_root /var/www/wa-app/web/ROOT; #设置图片跟目录
set $file "$image_root$uri"; # $image_root 指向/var/www/wa-app/web/R#OOT $uri 指向访问的路径的后半段比如： 指向的是 /upload/image#/2015/...xx.jpg
if (!-f $file)
{
#lua_code_cache off;
content_by_lua_file "/usr/local/nginx/conf/lua/Image.lua";#指向lua语言脚本
}
proxy_next_upstream http_502 http_504 error timeout invalid_header;
proxy_cache_valid 200 304 12h;
proxy_cache_key $uri$is_args$args;
#proxy_cache cache_one;
#proxy_cache_valid 200 302 1h;
#proxy_cache_valid 301 1d;
#proxy_cache_valid any 1m;
index index.html index.htm;
expires 7d;
}
location /nginx-status/
{
stub_status on;
access_log off;
}
}
c.Image.lua
if index then
originalUri = string.sub(ngx.var.uri, 0, index-2);
area = string.sub(ngx.var.uri, index);
index = string.find(area, "([.])");
area = string.sub(area, 0, index-1);
local index = string.find(originalFile, "([0-9]+)x([0-9]+)");
originalFile = string.sub(originalFile, 0, index-2)
end
-- check original file #检查源文件
if not file_exists(originalFile) then #先判断文件是否存在
local fileid = string.sub(originalUri, 2);
-- main
-- local fastdfs = require('restyfastdfs')
-- local fdfs = fastdfs:new()
-- fdfs:set_tracker("172.16.16.201", 22122)
-- fdfs:set_timeout(1000)
-- fdfs:set_tracker_keepalive(0, 100)
-- fdfs:set_storage_keepalive(0, 100)
-- local data = fdfs:do_download(fileid)
-- if data then
-- check image dir
if not is_dir(ngx.var.image_dir) then
os.execute("mkdir -p " .. ngx.var.image_dir)
end
writefile(originalFile, data)
-- end
end
-- 创建缩略图
-- local image_sizes = {"80x80", "800x600", "40x40", "60x60"};
local image_sizes = {"100x100","160x160","200x200","450x450","490x490","620x620","640x640","90x90"};
function table.contains(table, element) #这里判断填写的尺寸是否是规定的。这里注释掉了
--for _, value in pairs(table) do
-- if value == element then
-- return true
-- end
--end
--return false
return true
end
if area and table.contains(image_sizes, area) then #先判断是否符合尺寸要求，符合，生成图片
local command = "gm convert -quality 92 -thumbnail " .. area .. " " .. originalFile .. " " .. ngx.var.file; #执行Graphics命令
os.execute(command);
end;
if file_exists(ngx.var.file) then #再次判断文件是否存在，不存在返回404，存在继续执行
--ngx.req.set_uri(ngx.var.uri, true);
ngx.exec(ngx.var.uri)
else
ngx.exit(404)
end
测试：www.wa.com/upload/image/2015/20150210/FC12AB22D1DE477EAE60D1214F7951F1.jpg_150x150.jpg
如果没有成功，请自行查看nginx的错误日志。