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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">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
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