HttpLimitZoneModule

WARNING: this article is obsoleted. Please refer to http://nginx.org/en/docs/ for the latest official documentation.

= Synopsis = This module makes it possible to limit the number of simultaneous connections for the assigned session or as a special case, from one address.

Example configuration http { limit_zone  one  $binary_remote_addr  10m;

server { location /download/ { limit_conn  one  1; } } }

= Directives =

limit_zone


This directive is made obsolete in version 1.1.8, an equivalent limit_conn_zone directive with a changed syntax should be used instead:

limit_conn_zone $variable zone=name:size;

Directive describes the zone, in which the session states are stored. The numbers of sessions is determined by the assigned variable, it depends on the size of the used Variable and memory_max_size value.

Example of the use:

limit_zone one $binary_remote_addr 10m;

The address of client is used as the session. Notice that the variable  is used instead of.

The length of the values of the variable of  can be from 7 to 15 bytes; therefore size state is equal to 32 or 64 bytes.

Length of all values of the variable of  is always 4 bytes and the size of the state is always 32 bytes.

When the zone size is 1M then it is possible to handle 32000 sessions with 32 bytes/session.

limit_conn


Directive assigns the maximum number of simultaneous connections for one session. With exceeding of this number the request completes by the code "Service unavailable" (503).

For example, the directive:

limit_zone  one  $binary_remote_addr  10m;

server { location /download/ { limit_conn  one  1; }

This allows not more than one simultaneous connection from one address.

limit_conn_log_level


Sets the error log level used when a connection limit is reached

= References = Original Documentation