openresty 限流 (redis+lua) 备忘

githunb上下载lua-resty-limit-traffic 

解压到/usr/openv/servers/lualib/restylimit目录下。 servers 为openresty安装目录.

/usr/openv/servers/nginx/conf/lua目录

新建limit.lua  

local limit_req = require "resty.limit.req"   local redis = require "resty.redis"   local instance = redis.new();    instance.connect(instance,'127.0.0.1','6379')   local rate =tonumber(instance:get("limitrate"))    local burst =tonumber(instance:get("limitburst"))    --local rate=3 这里如果不用redis 可以直接使用rate=3进行赋值    --local burst =10    local error_status = 503   local nodelay = false   local lim, err = limit_req.new("limit_req_store", rate, burst)  if not lim then       ngx.exit(error_status)   end      local key = ngx.var.binary_remote_addr     local delay, err = lim:incoming(key, true)      if not delay and err == "rejected" then       ngx.exit(error_status)   end      if delay > 0 then       if nodelay then          else           ngx.sleep(delay)      end   end

/usr/openv/servers/nginx/conf

lua.conf

 server {     listen 80;     server_name _;  location /limit {              access_by_lua_file conf/lua/limit.lua;                             default_type 'text/html';                   lua_code_cache off;                   content_by_lua 'ngx.say("hello world")';                #   proxy_pass http://proxy/_cat/master;                #     proxy_redirect  off;            #   proxy_set_header        Host    $http_host;          # proxy_set_header        X-Real-IP       $remote_addr;          #  proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;          #     proxy_set_header   Cookie $http_cookie;  }

}

/usr/openv/servers/nginx/conf

nginx.conf 中增加:

 http {      include       mime.types; include lua.conf; default_type  application/octet-stream; lua_package_path "/usr/servers/lualib/?.lua;;"; lua_package_cpath "/usr/servers/lualib/?.so;;"; lua_shared_dict limit_req_store 10m;