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nginx限速

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nginx限制ip并发数和访问频率以及下载速度

限制并发

nginx版本1.1.8 之后
ngx_http_limit_zone_module 
改名为:
ngx_http_limit_conn_module

http://.org/en/docs/http/ngx_http_limit_conn_module.html#limit_conn

limit_zone指令改成limit_conn_zone了

并且支持
multiple limit_conn
E.g. if you want to limit number of connections per ip *and* total 
number of connections per virtual host.(即同时支持对对方ip和服务器自身的连接限制)

perip是声明的limit_zone 的名字,$binary_remote_addr是替代 $remore_addr 的变量,10m 是会话状态储存的空间
limit_conn perip 10;,限制客户端并发连接数量为1
perserver是现在服务器总共处理连接数为100

限制访问频率
http://nginx.org/en/docs/http/ngx_http_limit_req_module.html

上面的参数会让nginx 一秒钟只处理一个请求,但是仍然会有很多还在队列里面等待处理,这样也会占用很多tcp连接,从上面那条命令的结果中就能看得出来。
如果加上nodelay就会立即丢弃
limit_req zone=req_one burst=120 nodelay;

限制下载速度

参考:
关于limit_zone:http://wiki.nginx.org/NginxHttpLimitZoneModule
关于limit_rate和limit_conn:http://wiki.nginx.org/NginxHttpCoreModule
limit_zone,是针对每个IP定义一个存储session状态的容器。这个示例中定义了一个10m的容器,按照32bytes/session,可以处理320000个session。
limit_conn one 1;
限制每个IP只能发起一个并发连接。
limit_rate 300k;
对每个连接限速300k. 注意,这里是对连接限速,而不是对IP限速。如果一个IP允许两个并发连接,那么这个IP就是限速limit_rate×2。

An IP address of the client serves as a key. Note that instead of $remote_addr, the $binary_remote_addr variable is used here, allowing to lower the size of a state down to 64 bytes. One megabyte zone can keep about 16 thousand 64-byte states. If the storage for a zone is exhausted, the server will return error 503 (Service Temporarily Unavailable) to all further requests.
The rate is specified in requests per second (r/s). If a rate of less than one request per second is desired, it is specified in request per minute (r/m). For example, half-request per second is 30r/m.

源文档

http://wiki.nginx.org/HttpLimitZoneModule
http://blog.sina.com.cn/s/blog_6917c4aa0100ve5r.html
http://storysky.blog.51cto.com/628458/642970/

本文来自: nginx限速