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<!DOCTYPE html> <head> <meta charset="utf-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" /> <title>LiteSpeed Web Server Users' Manual - App Server Settings</title> <meta name="description" content="LiteSpeed Web Server Users' Manual - App Server Settings." /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <meta name="robots" content="noindex"> <link rel="shortcut icon" href="img/favicon.ico" /> <link rel="stylesheet" type="text/css" href="css/hdoc.css"> </head> <body> <div class="pagewrapper clearfix"><aside class="sidetree ls-col-1-5"> <figure> <img src="img/lsws_logo.svg" alt="lightspeed web server logo" width="100px"/> </figure> <h2 class="ls-text-thin"> LiteSpeed Web Server <br /> <span class="current"><a href="index.html">Users' Manual</a></span> </h2> <h3 class="ls-text-muted">Version 6.3 — Rev. 4</h3> <hr/> <div> <ul> <li><a href="license.html">License Enterprise</a></li> <li><a href="intro.html">Introduction</a></li> <li><a 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<ul class="level3"> <li><a href="Static_Context.html">Static Context</a></li> <li> <a href="Java_Web_App_Context.html">Java Web App Context</a> </li> <li><a href="Servlet_Context.html">Servlet Context</a></li> <li><a href="FCGI_Context.html">Fast CGI Context</a></li> <li><a href="LSAPI_Context.html">LSAPI Context</a></li> <li><a href="Proxy_Context.html">Proxy Context</a></li> <li><a href="CGI_Context.html">CGI Context</a></li> <li><a href="LB_Context.html">Load Balancer Context</a></li> <li><a href="Redirect_Context.html">Redirect Context</a></li> <li><a href="App_Server_Context.html">App Server Context</a></li> <li><a href="Rails_Context.html">Rack/Rails Context</a></li> </ul> <li><a href="VHAddOns_Help.html">Add-ons</a></li> </ul> </li> <li> <a href="webconsole.html">Web Console</a> <ul class="level2"> <li><a href="AdminGeneral_Help.html">Admin Console General</a></li> <li><a href="AdminSecurity_Help.html">Admin Console Security</a></li> <li> <a href="AdminListeners_General_Help.html"> Admin Listener General </a> </li> <li> <a href="AdminListeners_SSL_Help.html">Admin Listener SSL</a> </li> </ul> </li> </ul> </div> </aside> <article class="contentwrapper ls-col-3-5 clearfix"><div class="nav-bar ls-spacer-micro-top"><div class="prev">« <a href="PHP_Help.html">PHP</a></div><div class="center"><a href="config.html">Configuration</a></div><div class="next"><a href="Listeners_General_Help.html">Listeners General</a> »</div></div> <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">Memory Soft Limit (bytes)</a> | <a href="#memHardLimit">Memory Hard Limit (bytes)</a> | <a href="#procSoftLimit">Process Soft Limit</a> | <a href="#procHardLimit">Process Hard Limit</a></p></section> <section class="toc-row"><header><a href="#railsHosting">Rack/Rails Shared Hosting</a></header><p> <a href="#enableRailsHosting">Enable Shared Hosting</a> | <a href="#railsAppLimit">Max Apps Per Account</a> | <a href="#rubyProcLimit">Max Ruby Processes Per Account</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">Memory Soft Limit (bytes)</a> | <a href="#memHardLimit">Memory Hard Limit (bytes)</a> | <a href="#procSoftLimit">Process Soft Limit</a> | <a href="#procHardLimit">Process Hard Limit</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">Memory Soft Limit (bytes)</a> | <a href="#memHardLimit">Memory Hard Limit (bytes)</a> | <a href="#procSoftLimit">Process Soft Limit</a> | <a href="#procHardLimit">Process Hard Limit</a></p></section> </section> <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>Absolute path</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>Integer number</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>Integer number</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>Integer number</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.<br/><br/> Default value: <span class="val">-1{/val}</p> <h4>Syntax</h4><p>Integer number</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>Integer number</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">Priority</a></span></p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="memSoftLimit"><h3>Memory Soft Limit (bytes)<span class="ls-permlink"><a href="#memSoftLimit"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the memory consumption limit in bytes for an external application process or an external application started by the server.<br/><br/> The main purpose of this limit is to prevent excessive memory usage because of software bugs or intentional attacks, not to impose a limit on normal usage. Make sure to leave enough head room, otherwise your application may fail and 503 error may be returned. It can be set at the server- level or at an individual external application level. The server-level limit will be used if it is not set at the individual application level.<br/><br/> The operating system's default setting will be used if the value is absent at both levels or set to <span class="val">0</span>.</p> <h4>Syntax</h4><p>Integer number</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 needs more memory.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="memHardLimit"><h3>Memory Hard Limit (bytes)<span class="ls-permlink"><a href="#memHardLimit"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Much the same as <span class="tagl"><a href="#memSoftLimit">Memory Soft Limit (bytes)</a></span>, except the soft limit can be raised up to the hard limit from within a user process. The hard limit can be set at server level or at an individual external application level. The server-level limit will be used if it is not set at an individual application level.<br/><br/> The operating system's default will be used if the value is absent at both levels or set to <span class="val">0</span>.</p> <h4>Syntax</h4><p>Integer number</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>Process Soft Limit<span class="ls-permlink"><a href="#procSoftLimit"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Limits the total number of processes that can be created on behalf of a user. All existing processes will be counted against this limit, not just new processes to be started.<br/><br/> The limit can be set at the server level or at an individual external application level. The server-level limit will be used if it is not set at an individual application level. The operating system's default setting will be used if this value is 0 or absent at both levels.</p> <h4>Syntax</h4><p>Integer number</p> <h4>Tips</h4><p><span title="Information" class="ls-icon-info"></span> To control how many processes LSWS will make for users in mod_suEXEC mode, use the suEXEC Max Conn setting. PHP scripts can call for forking processes and the number of processes needed for normal functioning can be above the suEXEC Max Conn setting. 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>Process Hard Limit<span class="ls-permlink"><a href="#procHardLimit"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Much the same as <span class="tagl"><a href="#procSoftLimit">Process Soft Limit</a></span>, except the soft limit can be raised up to the hard limit from within a user process. The hard limit can be set at the server level or at an individual external application level. The server-level limit will be used if it is not set at an individual application level. The operating system's default value will be used if the value is absent at both levels or set to <span class="val">0</span>.</p> <h4>Syntax</h4><p>Integer number</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="railsHosting"><h3>Rack/Rails Shared Hosting<span class="ls-permlink"><a href="#railsHosting"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>LiteSpeed's Rack/Rails Shared Hosting settings allow users using our high performance, highly scalable Ruby LSAPI module to easily control their customers' Ruby usage.<br/><br/> LiteSpeed Rack/Rails hosting solution can deliver the best performance with minimum server resource requirement. In addition, it is compatible with all existing web hosting control panels. <br/><br/> The user-manageable Rack/Rails configuration file (".ls_rails_config") is located in the user's home directory or virtual host root directory. Syntax is as follows: <br/> <blockquote> #RailsApp <name> <App Path> <Rails Evn> <Children Processes> <RunOnStart><br/> RailsApp testApp "/lsws/testrails" "development" 4 1 <br/><br/> #RailsAppMap <name> <domain> <URI> <br/> RailsAppMap testApp "testrails.com" "/" <br/> RailsAppMap testApp "test.testrails.com" "/" </blockquote><br/> The "App Path" is relative to the user's home directory or the virtual host root directory.<br/><br/> Whenever this file is touched, Rack/Rails applications will be restarted.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="enableRailsHosting"><h3>Enable Shared Hosting<span class="ls-permlink"><a href="#enableRailsHosting"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies whether to enable Rack/Rails shared hosting. The default is "Disabled".</p> <h4>Syntax</h4><p>Select from radio box</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="railsAppLimit"><h3>Max Apps Per Account<span class="ls-permlink"><a href="#railsAppLimit"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the maximum number of Rack/Rails applications that can be created per account. The default is "1".</p> <h4>Syntax</h4><p>Integer number</p> <h4>Tips</h4><p><span title="Performance" class="ls-icon-performance"></span> Rack/Rails applications can take a large amount of system resources. Thus it is not recommended to set this limit too high, otherwise it may affect the performance of whole server if one user abuses it.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="rubyProcLimit"><h3>Max Ruby Processes Per Account<span class="ls-permlink"><a href="#rubyProcLimit"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the maximum number of Ruby processes that can be created per account. The default is "10". If one account runs multiple Rack/Rails applications, the total number of Ruby processes of all applications cannot exceed this limit. Each ruby process will take large amount of system resource, it is not recommended to set a high limit, otherwise, it will affect the performance of whole server if one user abuse it.</p> <h4>Syntax</h4><p>Integer number</p> <h4>Tips</h4><p><span title="Performance" class="ls-icon-performance"></span> Ruby processes can take a large amount of system resources. Thus it is not recommended to set this limit too high, otherwise it may affect the performance of the whole server if one user abuses it.</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>Absolute path</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>Absolute path</p> </article> </div> </section> </article><div class="ls-col-1-1"><footer class="copyright">Copyright © 2003-2020. <a href="https://www.litespeedtech.com">LiteSpeed Technologies Inc.</a> All rights reserved.</footer> </div></div> </body> </html>