解读nginx中limit配置参数

2024-08-30 12:25:13

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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相关配置参数。

limit_rate

名称	默认配置	作用域	官方说明	中文解读	模块
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.	指定每秒该连接能下载的bytes,主要用来限制个别请求的带宽	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.	设置多少bytes过后将启动limit计数,如果小于此值则不限速	ngx_http_core_module
limit_except	没有默认值	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	设置除了指定的http methods外其他method将被限制，允许GET就自动允许HEAD方法	ngx_http_core_module

实例

 location /downloads {      limit_rate_after 1m;      limit_rate 500k;    }    location / {      proxy_pass http://localhost:3000;      limit_except GET {        deny all;      }    }

limit_conn

名称	默认配置	作用域	官方说明	中文解读	模块
limit_conn	没有默认值,语法 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.	指定一个zone的每个key最大连接数	ngx_http_limit_conn_module
limit_conn_zone	没有默认值,语法 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.	第一个参数是key,第二个参数是指定zone及其存放元数据(key,current num of conns per key,zone size)的共享内存大小	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.	指定当触发limit的时候日志打印级别	ngx_http_limit_conn_module