Opened 2 years ago

Last modified 2 years ago

#2346 closed defect

limit_req_zone is incorrect block requests — at Initial Version

Reported by: Maxim Owned by:
Priority: minor Milestone:
Component: nginx-module Version: 1.19.x
Keywords: limit_req_zone Cc:
uname -a: Linux 065bb1414626 4.15.0-45-generic #48-Ubuntu SMP Tue Jan 29 16:28:13 UTC 2019 x86_64 GNU/Linux
nginx -V: nginx version: nginx/1.21.6
built by gcc 10.2.1 20210110 (Debian 10.2.1-6)
built with OpenSSL 1.1.1k 25 Mar 2021 (running with OpenSSL 1.1.1n 15 Mar 2022)
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-compat --with-file-aio --with-threads --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-mail --with-mail_ssl_module --with-stream --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --with-cc-opt='-g -O2 -ffile-prefix-map=/data/builder/debuild/nginx-1.21.6/debian/debuild-base/nginx-1.21.6=. -fstack-protector-strong -Wformat -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fPIC' --with-ld-opt='-Wl,-z,relro -Wl,-z,now -Wl,--as-needed -pie'

Description

Hello!

I try setup limit_req_zone for load balancing.

My config:

limit_req_zone $binary_remote_addr zone=block_1:10m rate=50r/s;

server {
        server_name   test.local;
        listen        80;

        location      / {
           limit_req zone=block_1;
           limit_req_status 418;

           root /etc/nginx/conf.d/;
        }

    }

For tests i use yandex-tank with config:

phantom:
  address: mysite.com:80  # [Target's address]:[target's port]
  uris:
    - /
  load_profile:
    load_type: rps # schedule load by defining requests per second
    schedule: line(50, 50, 1m) # starting from 1rps growing linearly to 10rps during 10 minutes
  headers:
    - "[Referer: /]"
  ssl: false
console:
  enabled: false # enable console output
telegraf:
  enabled: false # let's disable telegraf monitoring for the first time
overload:
  enabled: true
  package: yandextank.plugins.DataUploader
  token_file: "token.txt"

and results is very strange:
for 30rps in fact ~18rps
​https://overload.yandex.net/520419#tab=test_data&tags=&plot_groups=main&machines=&metrics=&slider_start=1651236460&slider_end=1651236520

for 50rps in fact ~30rps
​https://overload.yandex.net/520421#tab=test_data&tags=&plot_groups=main&machines=&metrics=&slider_start=1651236627&slider_end=1651236687

docker-compose.yml

version: '3.5'

services:
    nginx:
      #network_mode: host
      image: nginx
      volumes:
        - ./conf:/etc/nginx/conf.d
      ports:
        - '7777:80'

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