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Add documentation for new 'backlog' config option #166

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17 changes: 16 additions & 1 deletion source/configuration.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -99,6 +99,21 @@ Available listener options:
defines SSL/TLS
:ref:`settings <configuration-listeners-ssl>`.

* - **backlog**
- Integer;
controls the 'backlog' parameter to the listen(2) system-call.
This essentially limits the number of pending connections waiting
to be accepted.

The default varies by system. On Linux, FreeBSD, OpenBSD and macOS
we default (-1) to the OS's default. E.g. on Linux since 5.4 this is
4096, on FreeBSD it's 128.

On other systems we default to 511.

NOTE: Whatever limit you set here will be limited by the OS's
system-wide sysctl, e.g. on Linux net.core.somaxconn and on BSD
kern.ipc.somaxconn

Here, a local listener accepts requests at port 8300
and passes them to the **blogs** app
Expand Down Expand Up @@ -5662,4 +5677,4 @@ Example with njs and the use of a template literal:
"if": "`${uri == '/health' ? false : true}`",
"path": "..."
}
}
}