Nginx's request limits

Connection frequency limit -limit_conn_module

The frequency of requests Development -limit_req_module

tcp three-way handshake, a connection can be established repeatedly http request

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Connection limit of grammar

# Syntax 1

Syntax：limit_conn_zone key zone=name:size;

Default:——

Context：http

# Syntax 2

Syntax：limit_conn zone number

Default：——

Context：http，server，location

Syntax request limits

# Syntax 1

Syntax：limit_req_zone key zone=name:size rate=rate    

Default：——

Context：http

# Syntax 2

Syntax：limit_req zone=name [burst=number] [nodelay]

Default：——

Context：http，server，location

Demo:

we /etc/nginx/conf.d/default.conf

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limit_conn_zone(连接限制) $binary_remote_addr zone=conn_zone:1m; 
    limit_req_zone(请求限制) $binary_remote_addr(请求ip) zone=req_zone(名称):1m(空间大小) rate=1r/s(一秒一次);
server {
    listen       80;
    server_name  localhost;
 
    #charset koi8-r;
    #access_log  /var/log/nginx/log/host.access.log  main;
 
 
    location / {
        root /opt/app/code;
        limit_conn conn_zone 1;(一时刻只能处理一下连接请求)
        #limit_req zone=req_zone burst=3(最后3请求个放到下一秒执行) nodelay;
        #limit_req zone=req_zone burst=3;
        #limit_req zone=req_zone; (启动请求限制)
        index  index.html index.htm;
    }
 
    #error_page  404              /404.html;
 
    # redirect server error pages to the static page /50x.html
    #
    error_page   500 502 503 504 404  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }
 
    # proxy the PHP scripts to Apache listening on 127.0.0.1:80
    #
    #location ~ \.php$ {
    #    proxy_pass   http://127.0.0.1;
    #}
 
    # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
    #
    #location ~ \.php$ {
    #    root           html;
    #    fastcgi_pass   127.0.0.1:9000;
    #    fastcgi_index  index.php;
    #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
    #    include        fastcgi_params;
    #}
 
    # deny access to .htaccess files, if Apache's document root
    # concurs with nginx's one
    #
    #location ~ /\.ht {
    #    deny  all;
    #}
}

Whether the test request restrictions take effect

Ab installation tool

yum -y install httpd-tools

1. Initiate a limit_req zone = req_zone

Pressure measurement

ab -n 20 -c 20 http://192.168.96.188/1.html

When in effect prints an error log is as follows

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2. Start configuration limit_req zone = req_zone burst = 3 nodelay;

The same test

ab -n 20 -c 20 http://192.168.96.188/1.html

At this point there is to do delay, request that only 16

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3. The connection limit limit_conn conn_zone 1 as above