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<h1>App Server Settings</h1><h2 id="top">Table of Contents</h2><section class="toc"><section class="toc-row"><header><a href="#railsDefaults">Rack/Rails Default Settings</a></header><p>
<a href="#rubyBin">Ruby Path</a> | <a href="#appserverEnv">Run-Time Mode</a> | <a href="#maxConns">Max Connections</a> | <a href="#env">Environment</a> | <a href="#initTimeout">Initial Request Timeout (secs)</a> | <a href="#retryTimeout">Retry Timeout (secs)</a> | <a href="#pcKeepAliveTimeout">Connection Keepalive Timeout</a> | <a href="#respBuffer">Response Buffering</a> | <a href="#extMaxIdleTime">Max Idle Time</a> | <a href="#backlog">Back Log</a> | <a href="#runOnStartUp">Run On Start Up</a> | <a href="#extAppPriority">Priority</a> | <a href="#memSoftLimit">内存软限制</a> | <a href="#memHardLimit">内存硬限制</a> | <a href="#procSoftLimit">进程软限制</a> | <a href="#procHardLimit">进程硬限制</a></p></section>
<section class="toc-row"><header><a href="#wsgiDefaults">Python WSGI Default Settings</a></header><p>
<a href="#wsgiBin">WSGI Path</a> | <a href="#appserverEnv">Run-Time Mode</a> | <a href="#maxConns">Max Connections</a> | <a href="#env">Environment</a> | <a href="#initTimeout">Initial Request Timeout (secs)</a> | <a href="#retryTimeout">Retry Timeout (secs)</a> | <a href="#pcKeepAliveTimeout">Connection Keepalive Timeout</a> | <a href="#respBuffer">Response Buffering</a> | <a href="#extMaxIdleTime">Max Idle Time</a> | <a href="#backlog">Back Log</a> | <a href="#runOnStartUp">Run On Start Up</a> | <a href="#extAppPriority">Priority</a> | <a href="#memSoftLimit">内存软限制</a> | <a href="#memHardLimit">内存硬限制</a> | <a href="#procSoftLimit">进程软限制</a> | <a href="#procHardLimit">进程硬限制</a></p></section>
<section class="toc-row"><header><a href="#nodeDefaults">Node.js App Default Settings</a></header><p>
<a href="#nodeBin">Node Path</a> | <a href="#appserverEnv">Run-Time Mode</a> | <a href="#maxConns">Max Connections</a> | <a href="#env">Environment</a> | <a href="#initTimeout">Initial Request Timeout (secs)</a> | <a href="#retryTimeout">Retry Timeout (secs)</a> | <a href="#pcKeepAliveTimeout">Connection Keepalive Timeout</a> | <a href="#respBuffer">Response Buffering</a> | <a href="#extMaxIdleTime">Max Idle Time</a> | <a href="#backlog">Back Log</a> | <a href="#runOnStartUp">Run On Start Up</a> | <a href="#extAppPriority">Priority</a> | <a href="#memSoftLimit">内存软限制</a> | <a href="#memHardLimit">内存硬限制</a> | <a href="#procSoftLimit">进程软限制</a> | <a href="#procHardLimit">进程硬限制</a></p></section>
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<section><div class="helpitem"><article class="ls-helpitem"><div><header id="railsDefaults"><h3>Rack/Rails Default Settings<span class="ls-permlink"><a href="#railsDefaults"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Default configurations for Rack/Rails applications. These settings can be overriden at the context level.</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="rubyBin"><h3>Ruby Path<span class="ls-permlink"><a href="#rubyBin"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Path to Ruby executable. Generally, it is /usr/bin/ruby or /usr/local/bin/ruby depending on where Ruby has been installed to.</p> <h4>Syntax</h4><p>绝对路径</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="appserverEnv"><h3>Run-Time Mode<span class="ls-permlink"><a href="#appserverEnv"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies which mode the application will be running as: "Development", "Production", or "Staging". The default is "Production".</p> <h4>Syntax</h4><p>Select from drop down list</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="maxConns"><h3>Max Connections<span class="ls-permlink"><a href="#maxConns"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the maximum number of concurrent connections that can be established between the server and an external application. This setting controls how many requests can be processed concurrently by an external application, however, the real limit also depends on the external application itself. Setting this value higher will not help if the external application is not fast enough or cannot scale to a large number of concurrent requests.</p> <h4>Syntax</h4><p>无符号整数</p> <h4>Tips</h4><p><span title="Performance" class="ls-icon-performance"></span> Setting a high value does not directly translate to higher performance. Setting the limit to a value that will not overload the external application will provide the best performance/throughput.</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="env"><h3>Environment<span class="ls-permlink"><a href="#env"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies extra environment variables for the external application.</p> <h4>Syntax</h4><p>Key=value. Multiple variables can be separated by "ENTER"</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="initTimeout"><h3>Initial Request Timeout (secs)<span class="ls-permlink"><a href="#initTimeout"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the maximum time in seconds the server will wait for the external application to respond to the first request over a new established connection. If the server does not receive any data from the external application within this timeout limit, it will mark this connection as bad. This helps to identify communication problems with external applications as quickly as possible. If some requests take longer to process, increase this limit to avoid 503 error messages.</p> <h4>Syntax</h4><p>无符号整数</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="retryTimeout"><h3>Retry Timeout (secs)<span class="ls-permlink"><a href="#retryTimeout"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the period of time that the server waits before retrying an external application that had a prior communication problem.</p> <h4>Syntax</h4><p>无符号整数</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="pcKeepAliveTimeout"><h3>Connection Keepalive Timeout<span class="ls-permlink"><a href="#pcKeepAliveTimeout"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the maximum time in seconds to keep an idle persistent connection open.<br/><br/> When set to "-1", the connection will never timeout. When set to 0 or greater, the connection will be closed after this time in seconds has passed.</p> <h4>Syntax</h4><p>int</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="respBuffer"><h3>Response Buffering<span class="ls-permlink"><a href="#respBuffer"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies whether to buffer responses received from external applications. If a "nph-" (Non-Parsed-Header) script is detected, buffering is turned off for responses with full HTTP headers.</p> <h4>Syntax</h4><p>Select from drop down list</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="extMaxIdleTime"><h3>Max Idle Time<span class="ls-permlink"><a href="#extMaxIdleTime"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the maximum idle time before an external application is stopped by the server, freeing idle resources. When set to "-1", the external application will not be stopped by the server unless running in ProcessGroup mode where idle external applications will be stopped after 30 seconds. The default value is "-1".</p> <h4>Syntax</h4><p>Select from radio box</p> <h4>Tips</h4><p><span title="Performance" class="ls-icon-performance"></span> This feature is especially useful in the mass hosting environment where, in order to prevent files owned by one virtual host from being accessed by the external application scripts of another virtual host, many different applications are run at the same time in SetUID mode. Set this value low to prevent these external applications from idling unnecessarily.</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="backlog"><h3>Back Log<span class="ls-permlink"><a href="#backlog"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the backlog of the listening socket. Required if <span class="tagl"><a href="#autoStart">Start By Server</a></span> is enabled.</p> <h4>Syntax</h4><p>无符号整数</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="runOnStartUp"><h3>Run On Start Up<span class="ls-permlink"><a href="#runOnStartUp"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies whether to start the external application at server start up. Only applicable to external applications that can manage their own child processes and where <span class="tagl"><a href="#instances">Instances</a></span> value is set to "1".<br/><br/> If enabled, external processes will be created at server startup instead of run-time.<br/><br/> When selecting "Yes (Detached mode)", all detached process can be restarted at the Server level or Virtual Host level by touching the '.lsphp_restart.txt' file under the $SERVER_ROOT/admin/tmp/ or $VH_ROOT/ directory respectively.<br/><br/> Default value: Yes (Detached mode)</p> <h4>Syntax</h4><p>Select from radio box</p> <h4>Tips</h4><p><span title="Performance" class="ls-icon-performance"></span> If the configured external process has significant startup overhead, like a Rails app, then this option should be enabled to decrease first page response time.</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="extAppPriority"><h3>Priority<span class="ls-permlink"><a href="#extAppPriority"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies priority of the external application process. Value ranges from <span class="val">-20</span> to <span class="val">20</span>. A lower number means a higher priority. An external application process cannot have a higher priority than the web server. If this priority is set to a lower number than the server's, the server's priority will be used for this value.</p> <h4>Syntax</h4><p>int</p> <h4>See Also</h4><p class="ls-text-small">Server <span class="tagl"><a href="ServGeneral_Help.html#serverPriority">优先级</a></span></p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="memSoftLimit"><h3>内存软限制<span class="ls-permlink"><a href="#memSoftLimit"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>以字节为单位指定服务器启动的外部应用进程或程序的内存占用限制。<br/><br/> 此限制的目的主要是为了防范软件缺陷或蓄意攻击造成的过度内存使用， 而不是限制正常使用。确保留有足够的内存，否则您的应用程序可能故障并 返回503错误。限制可以在服务器级别或独立的外部应用程序级别设置。如 果未在独立的外部应用程序级别设定限制，将使用服务器级别的限制。<br/><br/> 如果在两个级别都没有设置该限制，或者限制值设为<span class="val">0</span>，将使用操 作系统的默认设置。</p> <h4>Syntax</h4><p>无符号整数</p> <h4>Tips</h4><p>[注意] 不要过度调整这个限制。如果您的应用程序需要更多的内存， 这可能会导致503错误。</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="memHardLimit"><h3>内存硬限制<span class="ls-permlink"><a href="#memHardLimit"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>与<span class="tagl"><a href="#memSoftLimit">内存软限制</a></span>非常相同，但是在一个用户进程中，软限制 可以被放宽到硬限制的数值。硬限制可以在服务器级别或独立的外部应用程序级别设 置。如果未在独立的外部应用程序级别设定限制，将使用服务器级别的限制。<br/><br/> 如果在两个级别都没有设置该限制，或者限制值设为<span class="val">0</span>，将使用操 作系统的默认设置。</p> <h4>Syntax</h4><p>无符号整数</p> <h4>Tips</h4><p><span title="Attention" class="ls-icon-attention"></span> Do not over adjust this limit. This may result in 503 errors if your application need more memory.</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="procSoftLimit"><h3>进程软限制<span class="ls-permlink"><a href="#procSoftLimit"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>限制一个用户可以创建的进程总数。所有存在的进程都将被统计在内， 而不是只包括新启动的进程。如果限制被设置为<span class="val">10</span>，并且一个用户下 有超过10个进程在运行，那么网站服务器将不会再为该用户（通过 suEXEC） 启动新进程。<br/><br/> 此限制的主要目的是为了防范“fork炸弹”攻击或过量使用，而不是限制正常使用 （如果该限制被设置的过低，它将被服务器忽略）。确保留有足够空余。 本项目可以在服务器级别或独立的外部应用程序级别设置。如果未在独立的外部应用程 序级别设定限制，将使用服务器级别的限制。如果在两个级别都没有设置该限制， 或者限制值设为<span class="val">0</span>，将使用操作系统的默认设置。</p> <h4>Syntax</h4><p>无符号整数</p> <h4>Tips</h4><p><span title="Information" class="ls-icon-info"></span> PHP scripts can call for forking processes. The main purpose of this limit is as a last line of defense to prevent fork bombs and other attacks caused by PHP processes creating other processes.<br/><br/> Setting this setting too low can severely hurt functionality. The setting will thus be ignored below certain levels.<br/><br/> When <b>Run On Start Up</b> is set to "Yes (Daemon mode)", the actual process limit will be higher than this setting to make sure parent processes are not limited.</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="procHardLimit"><h3>进程硬限制<span class="ls-permlink"><a href="#procHardLimit"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>与<span class="tagl"><a href="#procSoftLimit">进程软限制</a></span>非常相同，但是，在用户进程中软限制 可以被放宽到硬限制的数值。硬限制可以在服务器级别或独立的外部应用程序级别设 置。如果未在独立的外部应用程序级别设定限制，将使用服务器级别的限制。 如果在两个级别都没有设置该限制，或者限制值设为<span class="val">0</span>，将使用操 作系统的默认设置。</p> <h4>Syntax</h4><p>无符号整数</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="wsgiDefaults"><h3>Python WSGI Default Settings<span class="ls-permlink"><a href="#wsgiDefaults"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Default configurations for Python WSGI applications. These settings can be overriden at the context level.</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="wsgiBin"><h3>WSGI Path<span class="ls-permlink"><a href="#wsgiBin"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Path to LiteSpeed Python Web Server Gateway Interface executable (lswsgi).<br/><br/> This executable is created by compiling Python with LiteSpeed's WSGI LSAPI module.</p> <h4>Syntax</h4><p>绝对路径</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="nodeDefaults"><h3>Node.js App Default Settings<span class="ls-permlink"><a href="#nodeDefaults"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Default configurations for Node.js applications. These settings can be overriden at the context level.</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="nodeBin"><h3>Node Path<span class="ls-permlink"><a href="#nodeBin"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Path to Node.js executable.</p> <h4>Syntax</h4><p>绝对路径</p> </article> </div>
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