n+lua

mkdir -p /usr/servers
cd /usr/servers/
安装依赖
apt-get install libreadline-dev libncurses5-dev libpcre3-dev libssl-dev perl
下载ngx_openresty-1.7.7.2.tar.gz并解压

sudo wget http://openresty.org/download/ngx_openresty-1.7.7.2.tar.gz 
 sudo tar -xzvf ngx_openresty-1.7.7.2.tar.gz 

ngx_openresty-1.7.7.2/bundle目录里存放着nginx核心和很多第三方模块，比如有我们需要的Lua和LuaJIT。
安装LuaJIT
sudo find / -name luajit*
sudo ln -sf /usr/local/share/luajit-2.1.0-alpha /usr/local/bin/luajit
cd /usr/servers/ngx_openresty-1.7.7.2/bundle/
sudo wget https://github.com/FRiCKLE/ngx_cache_purge/archive/2.3.tar.gz
sudo tar -zxvf 2.3.tar.gz