openresty/samples/ip_blacklist

requires openresty bundle http://openresty.org/
  or ngx-lua module http://wiki.nginx.org/HttpLuaModule#Installation
  and lua-resty-redis from: https://github.com/agentzh/lua-resty-redis

Replace the distribution nginx with local installation of openresty

# service nginx stop
mv /usr/local/openresty/nginx/conf /usr/local/openresty/nginx/conf_install
ln -s /etc/nginx /usr/local/openresty/nginx/conf
mv /usr/sbin/nginx /usr/sbin/nginx-back
ln -s /usr/local/openresty/nginx/sbin/nginx /usr/sbin/nginx

mkdir /etc/nginx/lua
cp ip_blacklist.conf.lua /etc/nginx/lua/
cp ip_blacklist.lua /etc/nginx/lua/

Configure the NGINX - add two lines only:
1) on http section init_by_lua_file
2) on location section access_by_lua_file

nginx.conf example
...
http {
  ...
  # you do not need the following line if you are using the ngx_openresty bundle:
  #lua_package_path "/path/to/lua-resty-redis/lib/?.lua;;";
  # Инициализировать ip_blacklist
  init_by_lua_file '/etc/nginx/lua/ip_blacklist.conf.lua';
  
  ...
  
  location <...> {
    access_by_lua_file '/etc/nginx/lua/ip_blacklist.lua';
    proxy_pass ...
    ...
  }
}

# end nginx conf

Edit ip_blacklist config file ip_blacklist.conf.lua