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view docs/man/nginx.8 @ 7155:29e9571b1989
Gzip: support for a zlib variant from Intel.
A zlib variant from Intel as available from https://github.com/jtkukunas/zlib
uses 64K hash instead of scaling it from the specified memory level, and
also uses 16-byte padding in one of the window-sized memory buffers, and can
force window bits to 13 if compression level is set to 1 and appropriate
compile options are used. As a result, nginx complained with "gzip filter
failed to use preallocated memory" alerts.
This change improves deflate_state allocation detection by testing that
items is 1 (deflate_state is the only allocation where items is 1).
Additionally, on first failure to use preallocated memory we now assume
that we are working with the Intel's modified zlib, and switch to using
appropriate preallocations. If this does not help, we complain with the
usual alerts.
Previous version of this patch was published at
http://mailman.nginx.org/pipermail/nginx/2014-July/044568.html.
The zlib variant in question is used by default in ClearLinux from Intel,
see http://mailman.nginx.org/pipermail/nginx-ru/2017-October/060421.html,
http://mailman.nginx.org/pipermail/nginx-ru/2017-November/060544.html.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Sat, 18 Nov 2017 04:03:27 +0300 |
parents | 54b10b289f0f |
children | 4718a646187a |
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.\" .\" Copyright (C) 2010 Sergey A. Osokin .\" Copyright (C) Nginx, Inc. .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" .Dd June 16, 2015 .Dt NGINX 8 .Os .Sh NAME .Nm nginx .Nd "HTTP and reverse proxy server, mail proxy server" .Sh SYNOPSIS .Nm .Op Fl ?hqTtVv .Op Fl c Ar file .Op Fl g Ar directives .Op Fl p Ar prefix .Op Fl s Ar signal .Sh DESCRIPTION .Nm (pronounced .Dq engine x ) is an HTTP and reverse proxy server, as well as a mail proxy server. It is known for its high performance, stability, rich feature set, simple configuration, and low resource consumption. .Pp The options are as follows: .Bl -tag -width ".Fl d Ar directives" .It Fl ?\& , h Print help. .It Fl c Ar file Use an alternative configuration .Ar file . .It Fl g Ar directives Set global configuration directives. See .Sx EXAMPLES for details. .It Fl p Ar prefix Set the prefix path. The default value is .Pa %%PREFIX%% . .It Fl q Suppress non-error messages during configuration testing. .It Fl s Ar signal Send a signal to the master process. The argument .Ar signal can be one of: .Cm stop , quit , reopen , reload . The following table shows the corresponding system signals: .Pp .Bl -tag -width ".Cm reopen" -compact .It Cm stop .Dv SIGTERM .It Cm quit .Dv SIGQUIT .It Cm reopen .Dv SIGUSR1 .It Cm reload .Dv SIGHUP .El .It Fl t Do not run, just test the configuration file. .Nm checks the configuration file syntax and then tries to open files referenced in the configuration file. .It Fl T Same as .Fl t , but additionally dump configuration files to standard output. .It Fl V Print the .Nm version, compiler version, and .Pa configure script parameters. .It Fl v Print the .Nm version. .El .Sh SIGNALS The master process of .Nm can handle the following signals: .Pp .Bl -tag -width ".Dv SIGINT , SIGTERM" -compact .It Dv SIGINT , SIGTERM Shut down quickly. .It Dv SIGHUP Reload configuration, start the new worker process with a new configuration, and gracefully shut down old worker processes. .It Dv SIGQUIT Shut down gracefully. .It Dv SIGUSR1 Reopen log files. .It Dv SIGUSR2 Upgrade the .Nm executable on the fly. .It Dv SIGWINCH Shut down worker processes gracefully. .El .Pp While there is no need to explicitly control worker processes normally, they support some signals too: .Pp .Bl -tag -width ".Dv SIGINT , SIGTERM" -compact .It Dv SIGTERM Shut down quickly. .It Dv SIGQUIT Shut down gracefully. .It Dv SIGUSR1 Reopen log files. .El .Sh DEBUGGING LOG To enable a debugging log, reconfigure .Nm to build with debugging: .Pp .Dl "./configure --with-debug ..." .Pp and then set the .Cm debug level of the .Va error_log : .Pp .Dl "error_log /path/to/log debug;" .Pp It is also possible to enable the debugging for a particular IP address: .Bd -literal -offset indent events { debug_connection 127.0.0.1; } .Ed .Sh ENVIRONMENT The .Ev NGINX environment variable is used internally by .Nm and should not be set directly by the user. .Sh FILES .Bl -tag -width indent .It Pa %%PID_PATH%% Contains the process ID of .Nm . The contents of this file are not sensitive, so it can be world-readable. .It Pa %%CONF_PATH%% The main configuration file. .It Pa %%ERROR_LOG_PATH%% Error log file. .El .Sh EXIT STATUS Exit status is 0 on success, or 1 if the command fails. .Sh EXAMPLES Test configuration file .Pa ~/mynginx.conf with global directives for PID and quantity of worker processes: .Bd -literal -offset indent nginx -t -c ~/mynginx.conf \e -g "pid /var/run/mynginx.pid; worker_processes 2;" .Ed .Sh SEE ALSO .\"Xr nginx.conf 5 .\"Pp Documentation at .Pa http://nginx.org/en/docs/ . .Pp For questions and technical support, please refer to .Pa http://nginx.org/en/support.html . .Sh HISTORY Development of .Nm started in 2002, with the first public release on October 4, 2004. .Sh AUTHORS .An -nosplit .An Igor Sysoev Aq igor@sysoev.ru . .Pp This manual page was originally written by .An Sergey A. Osokin Aq osa@FreeBSD.org.ru as a result of compiling many .Nm documents from all over the world.