74 lines
4.5 KiB
HTML
74 lines
4.5 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Server daemons" />
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<meta name="abstract" content="The server daemon is a batch job associated with a particular server type." />
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<meta name="description" content="The server daemon is a batch job associated with a particular server type." />
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<meta name="DC.Relation" scheme="URI" content="rzaiistrhostsvr.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzaiidaemon" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Server daemons</title>
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</head>
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<body id="rzaiidaemon"><a name="rzaiidaemon"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Server daemons</h1>
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<div><p>The server daemon is a batch job associated with a particular server
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type.</p>
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<p>There is only one server daemon for each of the different server types
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(such as database, network print, and signon). Each server type has a one-to-many
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relationship between its server daemon and the actual server jobs; one server
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daemon potentially has many associated server jobs.</p>
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<p>The server daemon allows client applications to start communications with
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a host server that is using sockets communications support. The server daemon
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does this by handling and routing incoming connection requests. Once the client
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establishes communications with the server job, there is no further association
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between the client and the server daemon for the duration of that server job.</p>
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<p>Subsystems must be active to use server or file server jobs. When shipped,
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all server jobs are configured to run in the QUSRWRK subsystem, but you can
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change the subsystem in which they run. File server jobs and the database
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host server daemon job (QZDASRVSD) run in the QSERVER subsystem.</p>
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<p>The Start Host Server command starts server daemon jobs. The
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server daemons must be active for client applications to establish a connection
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with a host server that is using sockets communications support.</p>
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<p>If you are starting the database daemon or the file server daemon, the
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QSERVER subsystem must be active. If you start any of the other server daemons,
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the QSYSWRK subsystem must be active. To use the prestart jobs for the server
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daemons that run in the QSYSWRK subsystem, QUSRWRK must be active.</p>
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<div class="section"><h4 class="sectiontitle">Server Mapper Daemon</h4><p>The server mapper daemon is
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a batch job that runs in the QSYSWRK subsystem. It provides a method for client
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applications to determine the port number associated with a particular server.</p>
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<p>This
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job listens on a well-known port for a connection request from a client. The
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well-known port number for TCP/IP is 449. The client sends the service name
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to the server mapper. The server mapper obtains the port number for the specified
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service name from the service table. The server mapper returns this port number
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to the client, ends the connection, and returns to listen for another connection
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request. The client uses the port number returned from the server mapper daemon
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to connect to the specified server daemon.</p>
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<p>The server mapper daemon
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starts with the STRHOSTSVR command and ends with the ENDHOSTSVR command.</p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaiistrhostsvr.htm" title="To start Host Servers, use the STRHOSTSVR CL command.">Start host servers</a></div>
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</div>
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</div>
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</body>
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</html>
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