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&lt;article class=&quot;contentwrapper ls-col-3-5 clearfix&quot;&gt;&lt;div class=&quot;nav-bar ls-spacer-micro-top&quot;&gt;&lt;div class=&quot;prev&quot;&gt;&amp;#171 &lt;a href=&quot;External_WS.html&quot;&gt;Web Server&lt;/a&gt;&lt;/div&gt;&lt;div class=&quot;center&quot;&gt;&lt;a href=&quot;ExtApp_Help.html&quot;&gt;External Apps&lt;/a&gt;&lt;/div&gt;&lt;div class=&quot;next&quot;&gt;&lt;a href=&quot;External_LB.html&quot;&gt;Load Balancer&lt;/a&gt; &amp;#187;&lt;/div&gt;&lt;/div&gt;
&lt;h1&gt;Piped Logger&lt;/h1&gt;&lt;h2 id=&quot;top&quot;&gt;Table of Contents&lt;/h2&gt;&lt;section class=&quot;toc&quot;&gt;&lt;section class=&quot;toc-row&quot;&gt;&lt;header&gt;Piped Logger&lt;/header&gt;&lt;p&gt;
&lt;a href=&quot;#extAppName&quot;&gt;Name&lt;/a&gt; | &lt;a href=&quot;#extAppAddress&quot;&gt;Address&lt;/a&gt; | &lt;a href=&quot;#maxConns&quot;&gt;Max Connections&lt;/a&gt; | &lt;a href=&quot;#env&quot;&gt;Environment&lt;/a&gt; | &lt;a href=&quot;#extAppPath&quot;&gt;Command&lt;/a&gt; | &lt;a href=&quot;#instances&quot;&gt;Instances&lt;/a&gt; | &lt;a href=&quot;#extUser&quot;&gt;Run As User&lt;/a&gt; | &lt;a href=&quot;#extGroup&quot;&gt;Run As Group&lt;/a&gt; | &lt;a href=&quot;#extUmask&quot;&gt;umask&lt;/a&gt; | &lt;a href=&quot;#extAppPriority&quot;&gt;Priority&lt;/a&gt;&lt;/p&gt;&lt;/section&gt;
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&lt;section&gt;&lt;div class=&quot;helpitem&quot;&gt;&lt;article class=&quot;ls-helpitem&quot;&gt;&lt;div&gt;&lt;header id=&quot;extAppName&quot;&gt;&lt;h3&gt;Name&lt;span class=&quot;ls-permlink&quot;&gt;&lt;a href=&quot;#extAppName&quot;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span class=&quot;top&quot;&gt;&lt;a href=&quot;#top&quot;&gt;&amp;#8657;&lt;/a&gt;&lt;/span&gt;&lt;/h3&gt;&lt;/header&gt;&lt;/div&gt;&lt;h4&gt;Description&lt;/h4&gt;&lt;p&gt;A unique name for this external application. You will refer to it by this name when you use it in other parts of the configuration.&lt;/p&gt; &lt;/article&gt; &lt;/div&gt;
&lt;div class=&quot;helpitem&quot;&gt;&lt;article class=&quot;ls-helpitem&quot;&gt;&lt;div&gt;&lt;header id=&quot;extAppAddress&quot;&gt;&lt;h3&gt;Address&lt;span class=&quot;ls-permlink&quot;&gt;&lt;a href=&quot;#extAppAddress&quot;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span class=&quot;top&quot;&gt;&lt;a href=&quot;#top&quot;&gt;&amp;#8657;&lt;/a&gt;&lt;/span&gt;&lt;/h3&gt;&lt;/header&gt;&lt;/div&gt;&lt;h4&gt;Description&lt;/h4&gt;&lt;p&gt;A unique socket address used by the external application. IPv4/IPv6 sockets and Unix Domain Sockets (UDS) are supported. IPv4/IPv6 sockets can be used for communication over the network. UDS can only be used when the external application resides on the same machine as the server.&lt;/p&gt; &lt;h4&gt;Syntax&lt;/h4&gt;&lt;p&gt;IPv4 or IPV6 address:port or UDS://path&lt;/p&gt; &lt;h4&gt;Example&lt;/h4&gt;&lt;div class=&quot;ls-example&quot;&gt;127.0.0.1:5434&lt;br/&gt; UDS://tmp/lshttpd/php.sock.&lt;/div&gt;&lt;h4&gt;Tips&lt;/h4&gt;&lt;p&gt;&lt;span title=&quot;Security&quot; class=&quot;ls-icon-security&quot;&gt;&lt;/span&gt; If the external application runs on the same machine, UDS is preferred. If you have to use an IPv4|IPV6 socket, set the IP address to &lt;span class=&quot;val&quot;&gt;localhost&lt;/span&gt; or &lt;span class=&quot;val&quot;&gt;127.0.0.1&lt;/span&gt;, so the external application is inaccessible from other machines.&lt;br/&gt; &lt;span title=&quot;Performance&quot; class=&quot;ls-icon-performance&quot;&gt;&lt;/span&gt; Unix Domain Sockets generally provide higher performance than IPv4 sockets.&lt;/p&gt; &lt;/article&gt; &lt;/div&gt;
&lt;div class=&quot;helpitem&quot;&gt;&lt;article class=&quot;ls-helpitem&quot;&gt;&lt;div&gt;&lt;header id=&quot;maxConns&quot;&gt;&lt;h3&gt;Max Connections&lt;span class=&quot;ls-permlink&quot;&gt;&lt;a href=&quot;#maxConns&quot;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span class=&quot;top&quot;&gt;&lt;a href=&quot;#top&quot;&gt;&amp;#8657;&lt;/a&gt;&lt;/span&gt;&lt;/h3&gt;&lt;/header&gt;&lt;/div&gt;&lt;h4&gt;Description&lt;/h4&gt;&lt;p&gt;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.&lt;/p&gt; &lt;h4&gt;Syntax&lt;/h4&gt;&lt;p&gt;Integer number&lt;/p&gt; &lt;h4&gt;Tips&lt;/h4&gt;&lt;p&gt;&lt;span title=&quot;Performance&quot; class=&quot;ls-icon-performance&quot;&gt;&lt;/span&gt; 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.&lt;/p&gt; &lt;/article&gt; &lt;/div&gt;
&lt;div class=&quot;helpitem&quot;&gt;&lt;article class=&quot;ls-helpitem&quot;&gt;&lt;div&gt;&lt;header id=&quot;env&quot;&gt;&lt;h3&gt;Environment&lt;span class=&quot;ls-permlink&quot;&gt;&lt;a href=&quot;#env&quot;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span class=&quot;top&quot;&gt;&lt;a href=&quot;#top&quot;&gt;&amp;#8657;&lt;/a&gt;&lt;/span&gt;&lt;/h3&gt;&lt;/header&gt;&lt;/div&gt;&lt;h4&gt;Description&lt;/h4&gt;&lt;p&gt;Specifies extra environment variables for the external application.&lt;/p&gt; &lt;h4&gt;Syntax&lt;/h4&gt;&lt;p&gt;Key=value. Multiple variables can be separated by &quot;ENTER&quot;&lt;/p&gt; &lt;/article&gt; &lt;/div&gt;
&lt;div class=&quot;helpitem&quot;&gt;&lt;article class=&quot;ls-helpitem&quot;&gt;&lt;div&gt;&lt;header id=&quot;extAppPath&quot;&gt;&lt;h3&gt;Command&lt;span class=&quot;ls-permlink&quot;&gt;&lt;a href=&quot;#extAppPath&quot;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span class=&quot;top&quot;&gt;&lt;a href=&quot;#top&quot;&gt;&amp;#8657;&lt;/a&gt;&lt;/span&gt;&lt;/h3&gt;&lt;/header&gt;&lt;/div&gt;&lt;h4&gt;Description&lt;/h4&gt;&lt;p&gt;Specifies the full command line including parameters to execute the external application. Required value if &lt;span class=&quot;tagl&quot;&gt;&lt;a href=&quot;#autoStart&quot;&gt;Start By Server&lt;/a&gt;&lt;/span&gt; is enabled. A parameter should be quoted with a double or single quote if the parameter contains space or tab characters.&lt;/p&gt; &lt;h4&gt;Syntax&lt;/h4&gt;&lt;p&gt;Full path to the executable with optional parameters.&lt;/p&gt; &lt;h4&gt;See Also&lt;/h4&gt;&lt;p class=&quot;ls-text-small&quot;&gt;&lt;span class=&quot;tagl&quot;&gt;&lt;a href=&quot;#autoStart&quot;&gt;Start By Server&lt;/a&gt;&lt;/span&gt;&lt;/p&gt; &lt;/article&gt; &lt;/div&gt;
&lt;div class=&quot;helpitem&quot;&gt;&lt;article class=&quot;ls-helpitem&quot;&gt;&lt;div&gt;&lt;header id=&quot;instances&quot;&gt;&lt;h3&gt;Instances&lt;span class=&quot;ls-permlink&quot;&gt;&lt;a href=&quot;#instances&quot;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span class=&quot;top&quot;&gt;&lt;a href=&quot;#top&quot;&gt;&amp;#8657;&lt;/a&gt;&lt;/span&gt;&lt;/h3&gt;&lt;/header&gt;&lt;/div&gt;&lt;h4&gt;Description&lt;/h4&gt;&lt;p&gt;Specifies the maximum instances of the external application the server will create. It is required if &lt;span class=&quot;tagl&quot;&gt;&lt;a href=&quot;#autoStart&quot;&gt;Start By Server&lt;/a&gt;&lt;/span&gt; is enabled. Most FastCGI/LSAPI applications can only process one request per process instance and for those types of applications, instances should be set to match the value of &lt;span class=&quot;tagl&quot;&gt;&lt;a href=&quot;#maxConns&quot;&gt;Max Connections&lt;/a&gt;&lt;/span&gt;. Some FastCGI/LSAPI applications can spawn multiple child processes to handle multiple requests concurrently. For these types of applications, instances should be set to &quot;1&quot; and environment variables used to control how many child processes the application can spawn.&lt;/p&gt; &lt;h4&gt;Syntax&lt;/h4&gt;&lt;p&gt;Integer number&lt;/p&gt; &lt;/article&gt; &lt;/div&gt;
&lt;div class=&quot;helpitem&quot;&gt;&lt;article class=&quot;ls-helpitem&quot;&gt;&lt;div&gt;&lt;header id=&quot;extUser&quot;&gt;&lt;h3&gt;Run As User&lt;span class=&quot;ls-permlink&quot;&gt;&lt;a href=&quot;#extUser&quot;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span class=&quot;top&quot;&gt;&lt;a href=&quot;#top&quot;&gt;&amp;#8657;&lt;/a&gt;&lt;/span&gt;&lt;/h3&gt;&lt;/header&gt;&lt;/div&gt;&lt;h4&gt;Description&lt;/h4&gt;&lt;p&gt;The external application will run as this specified user name. If not set, Virtual Host level settings will be inherited.&lt;br/&gt;&lt;br/&gt; Default value: Not Set&lt;/p&gt; &lt;h4&gt;Syntax&lt;/h4&gt;&lt;p&gt;Valid username.&lt;/p&gt; &lt;h4&gt;See Also&lt;/h4&gt;&lt;p class=&quot;ls-text-small&quot;&gt;extGroup&lt;/p&gt; &lt;/article&gt; &lt;/div&gt;
&lt;div class=&quot;helpitem&quot;&gt;&lt;article class=&quot;ls-helpitem&quot;&gt;&lt;div&gt;&lt;header id=&quot;extGroup&quot;&gt;&lt;h3&gt;Run As Group&lt;span class=&quot;ls-permlink&quot;&gt;&lt;a href=&quot;#extGroup&quot;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span class=&quot;top&quot;&gt;&lt;a href=&quot;#top&quot;&gt;&amp;#8657;&lt;/a&gt;&lt;/span&gt;&lt;/h3&gt;&lt;/header&gt;&lt;/div&gt;&lt;h4&gt;Description&lt;/h4&gt;&lt;p&gt;The external application will run as this specified group name. If not set, Virtual Host level settings will be inherited.&lt;br/&gt;&lt;br/&gt; Default value: Not Set&lt;/p&gt; &lt;h4&gt;Syntax&lt;/h4&gt;&lt;p&gt;Valid group name.&lt;/p&gt; &lt;h4&gt;See Also&lt;/h4&gt;&lt;p class=&quot;ls-text-small&quot;&gt;extUser&lt;/p&gt; &lt;/article&gt; &lt;/div&gt;
&lt;div class=&quot;helpitem&quot;&gt;&lt;article class=&quot;ls-helpitem&quot;&gt;&lt;div&gt;&lt;header id=&quot;extUmask&quot;&gt;&lt;h3&gt;umask&lt;span class=&quot;ls-permlink&quot;&gt;&lt;a href=&quot;#extUmask&quot;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span class=&quot;top&quot;&gt;&lt;a href=&quot;#top&quot;&gt;&amp;#8657;&lt;/a&gt;&lt;/span&gt;&lt;/h3&gt;&lt;/header&gt;&lt;/div&gt;&lt;h4&gt;Description&lt;/h4&gt;&lt;p&gt;Sets default umask for this external application's processes. See &lt;span class=&quot;cmd&quot;&gt; man 2 umask &lt;/span&gt; for details. The default value taken from the server-level &lt;span class=&quot;tagl&quot;&gt;&lt;a href=&quot;ServSecurity_Help.html#umask&quot;&gt;umask&lt;/a&gt;&lt;/span&gt; setting.&lt;/p&gt; &lt;h4&gt;Syntax&lt;/h4&gt;&lt;p&gt;value valid range [000]-[777].&lt;/p&gt; &lt;h4&gt;See Also&lt;/h4&gt;&lt;p class=&quot;ls-text-small&quot;&gt;CGI &lt;span class=&quot;tagl&quot;&gt;&lt;a href=&quot;ServSecurity_Help.html#umask&quot;&gt;umask&lt;/a&gt;&lt;/span&gt;&lt;/p&gt; &lt;/article&gt; &lt;/div&gt;
&lt;div class=&quot;helpitem&quot;&gt;&lt;article class=&quot;ls-helpitem&quot;&gt;&lt;div&gt;&lt;header id=&quot;extAppPriority&quot;&gt;&lt;h3&gt;Priority&lt;span class=&quot;ls-permlink&quot;&gt;&lt;a href=&quot;#extAppPriority&quot;&gt;&lt;/a&gt;&lt;/span&gt;&lt;span class=&quot;top&quot;&gt;&lt;a href=&quot;#top&quot;&gt;&amp;#8657;&lt;/a&gt;&lt;/span&gt;&lt;/h3&gt;&lt;/header&gt;&lt;/div&gt;&lt;h4&gt;Description&lt;/h4&gt;&lt;p&gt;Specifies priority of the external application process. Value ranges from &lt;span class=&quot;val&quot;&gt;-20&lt;/span&gt; to &lt;span class=&quot;val&quot;&gt;20&lt;/span&gt;. 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.&lt;/p&gt; &lt;h4&gt;Syntax&lt;/h4&gt;&lt;p&gt;int&lt;/p&gt; &lt;h4&gt;See Also&lt;/h4&gt;&lt;p class=&quot;ls-text-small&quot;&gt;Server &lt;span class=&quot;tagl&quot;&gt;&lt;a href=&quot;ServGeneral_Help.html#serverPriority&quot;&gt;Priority&lt;/a&gt;&lt;/span&gt;&lt;/p&gt; &lt;/article&gt; &lt;/div&gt;
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