解讀nginx中l(wèi)imit配置參數(shù)

更新時間：2018年01月05日 14:12:13 投稿：laozhang

這篇文章主要介紹了nginx中l(wèi)imit配置參數(shù)的詳細作用，希望我們整理的內(nèi)容能幫助到你，一起學習下吧。

本文主要解析一下ngx_http_core_module、ngx_http_limit_conn_module以及ngx_http_limit_req_module中的limit相關(guān)配置參數(shù)。

limit_rate

名稱	默認配置	作用域	官方說明	中文解讀	模塊
limit_rate	limit_rate 0;	http, server, location, if in location	Limits the rate of response transmission to a client. The rate is specified in bytes per second. The zero value disables rate limiting. The limit is set per a request, and so if a client simultaneously opens two connections, the overall rate will be twice as much as the specified limit.	指定每秒該連接能下載的bytes,主要用來限制個別請求的帶寬	ngx_http_core_module
limit_rate_after	limit_rate_after 0;	http, server, location, if in location	Sets the initial amount after which the further transmission of a response to a client will be rate limited.	設(shè)置多少bytes過后將啟動limit計數(shù),如果小于此值則不限速	ngx_http_core_module
limit_except	沒有默認值	location	Limits allowed HTTP methods inside a location. The method parameter can be one of the following: GET, HEAD, POST, PUT, DELETE, MKCOL, COPY, MOVE, OPTIONS, PROPFIND, PROPPATCH, LOCK, UNLOCK, or PATCH. Allowing the GET method makes the HEAD method also allowed	設(shè)置除了指定的http methods外其他method將被限制，允許GET就自動允許HEAD方法	ngx_http_core_module

實例

 location /downloads {
      limit_rate_after 1m;
      limit_rate 500k;
    }

    location / {
      proxy_pass http://localhost:3000;
      limit_except GET {
        deny all;
      }
    }

limit_conn

名稱	默認配置	作用域	官方說明	中文解讀	模塊
limit_conn	沒有默認值,語法 limit_conn zone number;	http, server, location	Sets the shared memory zone and the maximum allowed number of connections for a given key value. When this limit is exceeded, the server will return the error in reply to a request.	指定一個zone的每個key最大連接數(shù)	ngx_http_limit_conn_module
limit_conn_zone	沒有默認值,語法 limit_conn_zone key zone=name:size;	http	Sets parameters for a shared memory zone that will keep states for various keys. In particular, the state includes the current number of connections. The key can contain text, variables, and their combination. Requests with an empty key value are not accounted.	第一個參數(shù)是key,第二個參數(shù)是指定zone及其存放元數(shù)據(jù)(key,current num of conns per key,zone size)的共享內(nèi)存大小	ngx_http_limit_conn_module
limit_conn_log_level	limit_conn_log_level error;	http, server, location	Sets the desired logging level for cases when the server limits the number of connections. This directive appeared in version 0.8.18.	指定當觸發(fā)limit的時候日志打印級別	ngx_http_limit_conn_module

實例

http {
  limit_conn_zone $binary_remote_addr zone=ips:10m;
  limit_conn_zone $server_name zone=servers:10m;
  limit_conn_log_level notice;
  server {
    # these limits apply to the whole virtual server
    limit_conn ips 10;

    # only 1000 simultaneous connections to the same server_name
    limit_conn servers 1000;
  }
}

limit_req

名稱	默認配置	作用域	官方說明	中文解讀	模塊
limit_req	沒有默認值,語法 limit_req zone=name [burst=number] [nodelay];	http, server, location	Sets the shared memory zone and the maximum burst size of requests. If the requests rate exceeds the rate configured for a zone, their processing is delayed such that requests are processed at a defined rate. Excessive requests are delayed until their number exceeds the maximum burst size in which case the request is terminated with an error.	指定zone的burst大小	ngx_http_limit_req_module
limit_req_zone	沒有默認值,語法 limit_req_zone key zone=name:size rate=rate;	http	Sets parameters for a shared memory zone that will keep states for various keys. In particular, the state stores the current number of excessive requests. The key can contain text, variables, and their combination. Requests with an empty key value are not accounted.	第一個參數(shù)指定key,第二個參數(shù)指定zone名稱和元數(shù)據(jù)的內(nèi)存大小,第三個參數(shù)rate指定單位時間的請求數(shù)閾值	ngx_http_limit_req_module
limit_req_log_level	limit_req_log_level error;	http, server, location	Sets the desired logging level for cases when the server refuses to process requests due to rate exceeding, or delays request processing. Logging level for delays is one point less than for refusals.	指定觸發(fā)req limit時打印的日志級別	ngx_http_limit_req_module

實例

http {
 limit_req_zone $binary_remote_addr zone=myreqzone:10m
 limit_req_log_level warn;
 server {
  ## 每個ip限定10個連接數(shù)
  ## 正常一個瀏覽器給每個host開兩到三個連接
  ## 觸發(fā)的話會返回503
  ## nodelay表示一上來就直接計算,不經(jīng)過一些預熱后再計算
  limit_req zone=myreqzone burst=10 nodelay;
 }
}

以上就是我們整理的nginx中l(wèi)imit配置參數(shù)的全部內(nèi)容，大家可以在下方的留言區(qū)討論，感謝你對腳本之家的支持。

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