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| author |   hongbotian <hongbo.tianhongbo@huawei.com> | 2015-11-30 03:10:21 -0500 |
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| committer | hongbotian <hongbo.tianhongbo@huawei.com> | 2015-11-30 03:10:21 -0500 |
| commit | c0b7206652b2852bc574694e7ba07ba1c2acdc00 (patch) | |
| tree | 5cb95cb0e19e03610525903df46279df2c3b7eb1 /rubbos/app/apache2/manual/stopping.html.en | |
| parent | b6d3d6e668b793220f2d3af1bc3e828553dc3fe6 (diff) | |
delete app
Change-Id: Id4c572809969ebe89e946e88063eaed262cff3f2
Signed-off-by: hongbotian <hongbo.tianhongbo@huawei.com>
Diffstat (limited to 'rubbos/app/apache2/manual/stopping.html.en')
| -rw-r--r-- | rubbos/app/apache2/manual/stopping.html.en | 235 |
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diff --git a/rubbos/app/apache2/manual/stopping.html.en b/rubbos/app/apache2/manual/stopping.html.en deleted file mode 100644 index 3fb04a00..00000000 --- a/rubbos/app/apache2/manual/stopping.html.en +++ /dev/null @@ -1,235 +0,0 @@ -<?xml version="1.0" encoding="ISO-8859-1"?> -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> -<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!-- - XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX - This file is generated from xml source: DO NOT EDIT - XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX - --> -<title>Stopping and Restarting - Apache HTTP Server</title> -<link href="./style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> -<link href="./style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> -<link href="./style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /> -<link href="./images/favicon.ico" rel="shortcut icon" /></head> -<body id="manual-page"><div id="page-header"> -<p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/directives.html">Directives</a> | <a href="./faq/">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p> -<p class="apache">Apache HTTP Server Version 2.0</p> -<img alt="" src="./images/feather.gif" /></div> -<div class="up"><a href="./"><img title="<-" alt="<-" src="./images/left.gif" /></a></div> -<div id="path"> -<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="./">Version 2.0</a></div><div id="page-content"><div id="preamble"><h1>Stopping and Restarting</h1> -<div class="toplang"> -<p><span>Available Languages: </span><a href="./de/stopping.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> | -<a href="./en/stopping.html" title="English"> en </a> | -<a href="./es/stopping.html" hreflang="es" rel="alternate" title="Español"> es </a> | -<a href="./ja/stopping.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | -<a href="./ko/stopping.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> | -<a href="./ru/stopping.html" hreflang="ru" rel="alternate" title="Russian"> ru </a> | -<a href="./tr/stopping.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p> -</div> - - <p>This document covers stopping and restarting Apache on - Unix-like systems. Windows NT, 2000 and XP users should see - <a href="platform/windows.html#winsvc">Running Apache as a - Service</a> and Windows 9x and ME users should see <a href="platform/windows.html#wincons">Running Apache as a - Console Application</a> for information on how to control - Apache on those platforms.</p> -</div> -<div id="quickview"><ul id="toc"><li><img alt="" src="./images/down.gif" /> <a href="#introduction">Introduction</a></li> -<li><img alt="" src="./images/down.gif" /> <a href="#term">Stop Now</a></li> -<li><img alt="" src="./images/down.gif" /> <a href="#graceful">Graceful Restart</a></li> -<li><img alt="" src="./images/down.gif" /> <a href="#hup">Restart Now</a></li> -<li><img alt="" src="./images/down.gif" /> <a href="#race">Appendix: signals and race conditions</a></li> -</ul><h3>See also</h3><ul class="seealso"><li><code class="program"><a href="./programs/httpd.html">httpd</a></code></li><li><code class="program"><a href="./programs/apachectl.html">apachectl</a></code></li><li><a href="invoking.html">Starting</a></li></ul></div> -<div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div> -<div class="section"> -<h2><a name="introduction" id="introduction">Introduction</a></h2> - - <p>In order to stop or restart Apache, you must send a signal to - the running <code class="program"><a href="./programs/httpd.html">httpd</a></code> processes. There are two ways to - send the signals. First, you can use the unix <code>kill</code> - command to directly send signals to the processes. You will - notice many <code class="program"><a href="./programs/httpd.html">httpd</a></code> executables running on your system, - but you should not send signals to any of them except the parent, - whose pid is in the <code class="directive"><a href="./mod/mpm_common.html#pidfile">PidFile</a></code>. That is to say you - shouldn't ever need to send signals to any process except the - parent. There are three signals that you can send the parent: - <code><a href="#term">TERM</a></code>, - <code><a href="#hup">HUP</a></code>, and - <code><a href="#graceful">USR1</a></code>, which - will be described in a moment.</p> - - <p>To send a signal to the parent you should issue a command - such as:</p> - -<div class="example"><p><code>kill -TERM `cat /usr/local/apache2/logs/httpd.pid`</code></p></div> - - <p>The second method of signaling the <code class="program"><a href="./programs/httpd.html">httpd</a></code> processes - is to use the <code>-k</code> command line options: <code>stop</code>, - <code>restart</code>, and <code>graceful</code>, - as described below. These are arguments to the <code class="program"><a href="./programs/httpd.html">httpd</a></code> binary, but we recommend that - you send them using the <code class="program"><a href="./programs/apachectl.html">apachectl</a></code> control script, which - will pass them through to <code class="program"><a href="./programs/httpd.html">httpd</a></code>.</p> - - <p>After you have signaled <code class="program"><a href="./programs/httpd.html">httpd</a></code>, you can read about - its progress by issuing:</p> - -<div class="example"><p><code>tail -f /usr/local/apache2/logs/error_log</code></p></div> - - <p>Modify those examples to match your <code class="directive"><a href="./mod/core.html#serverroot">ServerRoot</a></code> and <code class="directive"><a href="./mod/mpm_common.html#pidfile">PidFile</a></code> settings.</p> -</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div> -<div class="section"> -<h2><a name="term" id="term">Stop Now</a></h2> - -<dl><dt>Signal: TERM</dt> -<dd><code>apachectl -k stop</code></dd> -</dl> - - <p>Sending the <code>TERM</code> or <code>stop</code> signal to - the parent causes it to immediately attempt to kill off all of its - children. It may take it several seconds to complete killing off - its children. Then the parent itself exits. Any requests in - progress are terminated, and no further requests are served.</p> -</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div> -<div class="section"> -<h2><a name="graceful" id="graceful">Graceful Restart</a></h2> - -<dl><dt>Signal: USR1</dt> -<dd><code>apachectl -k graceful</code></dd> -</dl> - - <p>The <code>USR1</code> or <code>graceful</code> signal causes - the parent process to <em>advise</em> the children to exit after - their current request (or to exit immediately if they're not - serving anything). The parent re-reads its configuration files and - re-opens its log files. As each child dies off the parent replaces - it with a child from the new <em>generation</em> of the - configuration, which begins serving new requests immediately.</p> - - <div class="note">On certain platforms that do not allow <code>USR1</code> to - be used for a graceful restart, an alternative signal may be used (such - as <code>WINCH</code>). The command <code>apachectl graceful</code> - will send the right signal for your platform.</div> - - <p>This code is designed to always respect the process control - directive of the MPMs, so the number of processes and threads - available to serve clients will be maintained at the appropriate - values throughout the restart process. Furthermore, it respects - <code class="directive"><a href="./mod/mpm_common.html#startservers">StartServers</a></code> in the - following manner: if after one second at least <code class="directive"><a href="./mod/mpm_common.html#startservers">StartServers</a></code> new children have not - been created, then create enough to pick up the slack. Hence the - code tries to maintain both the number of children appropriate for - the current load on the server, and respect your wishes with the - <code class="directive"><a href="./mod/mpm_common.html#startservers">StartServers</a></code> - parameter.</p> - - <p>Users of <code class="module"><a href="./mod/mod_status.html">mod_status</a></code> - will notice that the server statistics are <strong>not</strong> - set to zero when a <code>USR1</code> is sent. The code was - written to both minimize the time in which the server is unable - to serve new requests (they will be queued up by the operating - system, so they're not lost in any event) and to respect your - tuning parameters. In order to do this it has to keep the - <em>scoreboard</em> used to keep track of all children across - generations.</p> - - <p>The status module will also use a <code>G</code> to indicate - those children which are still serving requests started before - the graceful restart was given.</p> - - <p>At present there is no way for a log rotation script using - <code>USR1</code> to know for certain that all children writing - the pre-restart log have finished. We suggest that you use a - suitable delay after sending the <code>USR1</code> signal - before you do anything with the old log. For example if most of - your hits take less than 10 minutes to complete for users on - low bandwidth links then you could wait 15 minutes before doing - anything with the old log.</p> - - <div class="note">If your configuration file has errors - in it when you issue a restart then your parent will not - restart, it will exit with an error. In the case of graceful - restarts it will also leave children running when it exits. - (These are the children which are "gracefully exiting" by - handling their last request.) This will cause problems if you - attempt to restart the server -- it will not be able to bind to - its listening ports. Before doing a restart, you can check the - syntax of the configuration files with the <code>-t</code> - command line argument (see <code class="program"><a href="./programs/httpd.html">httpd</a></code>). This still will not - guarantee that the server will restart correctly. To check the - semantics of the configuration files as well as the syntax, you - can try starting <code class="program"><a href="./programs/httpd.html">httpd</a></code> as a non-root user. If there - are no errors it will attempt to open its sockets and logs and fail - because it's not root (or because the currently running - <code class="program"><a href="./programs/httpd.html">httpd</a></code> already has those ports bound). If it fails - for any other reason then it's probably a config file error and the error - should be fixed before issuing the graceful restart.</div> -</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div> -<div class="section"> -<h2><a name="hup" id="hup">Restart Now</a></h2> - -<dl><dt>Signal: HUP</dt> -<dd><code>apachectl -k restart</code></dd> -</dl> - - <p>Sending the <code>HUP</code> or <code>restart</code> signal to - the parent causes it to kill off its children like in - <code>TERM</code>, but the parent doesn't exit. It re-reads its - configuration files, and re-opens any log files. Then it spawns a - new set of children and continues serving hits.</p> - - <p>Users of <code class="module"><a href="./mod/mod_status.html">mod_status</a></code> - will notice that the server statistics are set to zero when a - <code>HUP</code> is sent.</p> - -<div class="note">If your configuration file has errors in it when you issue a -restart then your parent will not restart, it will exit with an -error. See above for a method of avoiding this.</div> -</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div> -<div class="section"> -<h2><a name="race" id="race">Appendix: signals and race conditions</a></h2> - - <p>Prior to Apache 1.2b9 there were several <em>race - conditions</em> involving the restart and die signals (a simply put, - a race condition is a time-sensitive problem - if something happens - at just the wrong time or things happen in the wrong order, - undesired behaviour will result. If the same thing happens at the right - time, all will be well). For those architectures that have the "right" - feature set we have eliminated as many as we can. But it should - be noted that race conditions do still exist on certain - architectures.</p> - - <p>Architectures that use an on-disk <code class="directive"><a href="./mod/mpm_common.html#scoreboardfile">ScoreBoardFile</a></code> can potentially have - their scoreboards corrupted. This can result in the "bind: - Address already in use" (after <code>HUP</code>) or "long lost - child came home!" (after <code>USR1</code>). The former is a fatal - error, while the latter just causes the server to lose a - scoreboard slot. So it may be advisable to use graceful - restarts, with an occasional hard restart. These problems are very - difficult to work around, but fortunately most architectures do - not require a scoreboard file. See the <code class="directive"><a href="./mod/mpm_common.html#scoreboardfile">ScoreBoardFile</a></code> documentation for - architecture which uses it.</p> - - <p>All architectures have a small race condition in each child - involving the second and subsequent requests on a persistent - HTTP connection (KeepAlive). It may exit after reading the - request line but before reading any of the request headers. - There is a fix that was discovered too late to make 1.2. In - theory this isn't an issue because the KeepAlive client has to - expect these events because of network latencies and server - timeouts. In practice it doesn't seem to affect anything either - -- in a test case the server was restarted twenty times per - second and clients successfully browsed the site without - getting broken images or empty documents. </p> -</div></div> -<div class="bottomlang"> -<p><span>Available Languages: </span><a href="./de/stopping.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> | -<a href="./en/stopping.html" title="English"> en </a> | -<a href="./es/stopping.html" hreflang="es" rel="alternate" title="Español"> es </a> | -<a href="./ja/stopping.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | -<a href="./ko/stopping.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> | -<a href="./ru/stopping.html" hreflang="ru" rel="alternate" title="Russian"> ru </a> | -<a href="./tr/stopping.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p> -</div><div id="footer"> -<p class="apache">Copyright 2009 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p> -<p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/directives.html">Directives</a> | <a href="./faq/">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p></div> -</body></html>
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