解读nginx中limit配置参数
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_ratelimit_rate 0;http, server, location, if in locationLimits 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_modulelimit_rate_afterlimit_rate_after 0;http, server, location, if in locationSets 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_modulelimit_except没有默认值locationLimits 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, locationSets 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_modulelimit_conn_zone没有默认值,语法 limit_conn_zone key zone=name:size;httpSets 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_modulelimit_conn_log_levellimit_conn_log_level error;http, server, locationSets 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实例
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
名称默认配置作用域官方说明中文解读模块limit_req没有默认值,语法 limit_req zone=name ;http, server, locationSets 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_modulelimit_req_zone没有默认值,语法 limit_req_zone key zone=name:size rate=rate;httpSets 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.第一个参数指定key,第二个参数指定zone名称和元数据的内存大小,第三个参数rate指定单位时间的请求数阈值ngx_http_limit_req_modulelimit_req_log_levellimit_req_log_level error;http, server, locationSets 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.指定触发req limit时打印的日志级别ngx_http_limit_req_module实例
http {
limit_req_zone $binary_remote_addr zone=myreqzone:10m
limit_req_log_level warn;
server {
## 每个ip限定10个连接数
## 正常一个浏览器给每个host开两到三个连接
## 触发的话会返回503
## nodelay表示一上来就直接计算,不经过一些预热后再计算
limit_req zone=myreqzone burst=10 nodelay;
}
}
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