Proxy Limiting

Introduction

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- Nginx and Nginx Plus can limit the ff:

    a. number of connections per key value (e.g per IP address)

    b. request rate per key value (limits requests per second or minute)

    c. download speed

Limiting Number of Connections

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setup

http {     limit_conn_zone $server_name zone=servers:10m;     # $server_name -> key     # zone         -> used by worker processes to share counters for key values     # servers      -> zone name     # 10m          -> zone size  [...]   # limits connection on this location   location /download/ {       limit_conn addr 1;   } }

Limiting Request Rate

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setup

http {   [...]     # limits to 1 request per second (r/m for request per minute)     limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s;  [...]   location /download/ {       # This will limit requests to this location by 1r/s. If requests       # exeeds rate limit, those are put into queue. `burst` parameter       # is the max requests that awaits processing. If requests exceeds       # `burst` value, Nginx will respond a 503 error.       limit_req zone=one burst=5;       # You can use this instead to prevent delay set by `burst`       # limit_req zone=one burst=5 nodelay;   } }

Limiting bandwidth

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limits dowload speed to 50k/s but multiple connections are still allowed	location ~ \.bin {     root /data;     limit_rate 50k;   }
limits download speed and at the same time limits 1 connection per IP address	http {   [...]   limit_conn_zone $binary_remote_addr zone=addr:10m;   [...] } server {   [...]   location ~ \.bin {     root /data;     limit_conn addr 1;     limit_rate 50k;   }   [...] }
limits bandwidth after certain size has been downloaded (e.g: useful when client needs to download a file header)	location {   [...]   limit_rate_after 500k;   limit_rate 20k;   [...] }