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<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>Core Module</title></head><body><a name="example"></a><center><h4>Example Configuration</h4></center><p><blockquote><pre>
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user www www;
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worker_processes 2;
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error_log /var/log/nginx-error.log info;
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events {
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use kqueue;
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worker_connections 2048;
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}
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...
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</pre></blockquote></p><a name="directives"></a><center><h4>Directives</h4></center><hr><a name="daemon"></a><strong>syntax</strong>:
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<code>daemon <code>on</code> | <code>off</code></code><br><strong>default</strong>:
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<code>daemon on</code><br><strong>context</strong>:
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<code>main</code><br><p>
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Determines whether nginx should become a daemon.
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Mainly used during development.
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</p><hr><a name="env"></a><strong>syntax</strong>:
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<code>env <code><i>VAR</i></code>[=<code><i>VALUE</i></code>]</code><br><strong>default</strong>:
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<code>env TZ</code><br><strong>context</strong>:
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<code>main</code><br><p>
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Allows to limit a set of environment variables, change their values,
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or create new environment variables, for the following cases:
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<ul><li>
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variable inheritance during a
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<u>live upgrade</u>
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of an executable file;
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</li><li>
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use of variables by the
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<u>http_perl</u>
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module;
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</li><li>
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use of variables by worker processes.
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Please bear in mind that controlling system libraries in this way
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isn't always possible as it's not uncommon for libraries to check
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variables only during initialization, well before they can be set
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using this directive.
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An exception from this is an above mentioned
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<u>live upgrade</u>
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of an executable file.
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</li></ul></p><p>
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The TZ variable is always inherited and made available to the
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<u>http_perl</u>
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module, unless configured explicitly.
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</p><p>
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Usage example:
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<blockquote><pre>
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env MALLOC_OPTIONS;
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env PERL5LIB=/data/site/modules;
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env OPENSSL_ALLOW_PROXY_CERTS=1;
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</pre></blockquote></p><hr><a name="include"></a><strong>syntax</strong>:
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<code>include <code><i>file</i></code> | <code><i>mask</i></code></code><br><strong>default</strong>:
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<strong>none</strong><br><strong>context</strong>:
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<strong>any</strong><br><p>
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Includes another <code><i>file</i></code>, or files matching the
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specified <code><i>mask</i></code>, into configuration.
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Included files should consist of
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syntactically correct directives and blocks.
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</p><p>
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Usage example:
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<blockquote><pre>
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include mime.types;
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include vhosts/*.conf;
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</pre></blockquote></p><hr><a name="master_process"></a><strong>syntax</strong>:
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<code>master_process <code>on</code> | <code>off</code></code><br><strong>default</strong>:
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<code>master_process on</code><br><strong>context</strong>:
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<code>main</code><br><p>
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Determines whether worker processes are started.
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This directive is intended for nginx developers.
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</p><hr><a name="pid"></a><strong>syntax</strong>:
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<code>pid <code><i>file</i></code></code><br><strong>default</strong>:
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<code>pid nginx.pid</code><br><strong>context</strong>:
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<code>main</code><br><p>
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Defines a <code><i>file</i></code> which will store the process ID of the main process.
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</p><hr><a name="ssl_engine"></a><strong>syntax</strong>:
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<code>ssl_engine <code><i>device</i></code></code><br><strong>default</strong>:
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<strong>none</strong><br><strong>context</strong>:
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<code>main</code><br><p>
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Defines the name of the hardware SSL accelerator.
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</p><hr><a name="user"></a><strong>syntax</strong>:
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<code>user <code><i>user</i></code> [<code><i>group</i></code>]</code><br><strong>default</strong>:
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<code>user nobody nobody</code><br><strong>context</strong>:
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<code>main</code><br><p>
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Defines <code><i>user</i></code> and <code><i>group</i></code>
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credentials used by worker processes.
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If <code><i>group</i></code> is omitted, a group whose name equals
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that of <code><i>user</i></code> is used.
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</p><hr><a name="timer_resolution"></a><strong>syntax</strong>:
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<code>timer_resolution <code><i>interval</i></code></code><br><strong>default</strong>:
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<strong>none</strong><br><strong>context</strong>:
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<code>main</code><br><p>
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Reduces timer resolution in worker processes, thus reducing the
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number of <code>gettimeofday()</code> system calls made.
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By default, <code>gettimeofday()</code> is called each time
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on receiving a kernel event.
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With reduced resolution, <code>gettimeofday()</code> is only
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called once per specified <code><i>interval</i></code>.
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</p><p>
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Example:
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<blockquote><pre>
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timer_resolution 100ms;
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</pre></blockquote></p><p>
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An internal implementation of interval depends on the method used:
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<ul><li>
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an <code>EVFILT_TIMER</code> filter if <code>kqueue</code> is used;
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</li><li><code>timer_create()</code> if <code>eventport</code> is used;
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</li><li><code>setitimer()</code> otherwise.
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</li></ul></p><hr><a name="worker_rlimit_core"></a><strong>syntax</strong>:
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<code>worker_rlimit_core <code><i>size</i></code></code><br><strong>default</strong>:
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<strong>none</strong><br><strong>context</strong>:
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<code>main</code><br><p>
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Changes the limit on the largest size of a core file
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(<code>RLIMIT_CORE</code>) for worker processes.
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Used to increase the limit without restarting the main process.
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</p><hr><a name="worker_rlimit_nofile"></a><strong>syntax</strong>:
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<code>worker_rlimit_nofile <code><i>number</i></code></code><br><strong>default</strong>:
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<strong>none</strong><br><strong>context</strong>:
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<code>main</code><br><p>
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Changes the limit on the maximum number of open files
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(<code>RLIMIT_NOFILE</code>) for worker processes.
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Used to increase the limit without restarting the main process.
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</p><hr><a name="worker_priority"></a><strong>syntax</strong>:
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<code>worker_priority <code><i>number</i></code></code><br><strong>default</strong>:
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<code>worker_priority 0</code><br><strong>context</strong>:
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<code>main</code><br><p>
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Defines a scheduling priority for worker processes like is
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done by the <code>nice</code>: a negative
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<code><i>number</i></code>
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means higher priority.
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Allowed range normally varies from -20 to 20.
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</p><p>
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Example:
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<blockquote><pre>
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worker_priority -10;
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</pre></blockquote></p><hr><a name="worker_processes"></a><strong>syntax</strong>:
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<code>worker_processes <code><i>number</i></code></code><br><strong>default</strong>:
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<code>worker_processes 1</code><br><strong>context</strong>:
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<code>main</code><br><p>
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Defines the number of worker processes.
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</p><hr><a name="working_directory"></a><strong>syntax</strong>:
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<code>working_directory <code><i>directory</i></code></code><br><strong>default</strong>:
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<strong>none</strong><br><strong>context</strong>:
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<code>main</code><br><p>
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Defines a current working directory for a worker process.
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It's primarily used for writing a core-file, in which case
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a working process should have write permission for the
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specified directory.
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</p></body></html>
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