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150 lines
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<title>Set up and administration of a highly available Web server cluster
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on HTTP Server (powered by Apache)</title>
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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">Set up and administration of a highly available Web server cluster
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on HTTP Server (powered by Apache)</h1>
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<div><p>This topic provides information about how to set up and administer
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highly available Web server clusters for your HTTP Server with the <span>IBM<sup>®</sup> Web Administration for i5/OS™ interface</span>.</p>
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<div class="important"><span class="importanttitle">Important:</span> Information
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for this topic supports the latest PTF levels for HTTP Server for i5/OS .
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It is recommended that you install the latest PTFs to upgrade to the latest
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level of the HTTP Server for i5/OS. Some of the topics documented here are
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not available prior to this update. See <a href="http://www-03.ibm.com/servers/eserver/iseries/software/http/services/service.html" target="_blank">http://www.ibm.com/servers/eserver/iseries/software/http/services/service.htm</a> <img src="www.gif" alt="Link outside Information Center" /> for more information. </div>
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<p>All required programs (HTTP Server, WebSphere<sup>®</sup>, Servlets, Net.Data<sup>®</sup>,
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and Clustering support) must already be installed on all nodes. See <a href="http://www.iseries.ibm.com/ha" target="_blank">http://www.iseries.ibm.com/ha</a> <img src="www.gif" alt="Link outside Information Center" /> and <a href="rzaiehighavailability.htm">Highly available Web server cluster on HTTP Server</a> for more information. </p>
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<div class="section"><h4 class="sectiontitle">Step 1 - Configure the iSeries™ Cluster for highly available
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HTTP Server (powered by Apache)</h4><p>For each node, configure your cluster
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using the IBM Simple
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Cluster Management interface available through <a href="../rzahg/rzahginav.htm">iSeries
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Navigator</a> or use the cluster CL commands. See <a href="rzaiesetha_cl.htm">Set up a cluster using clustering CL commands for HTTP Server</a> and <a href="../rzaig/rzaigicclust.htm">Clusters</a> for more information.</p>
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<ol><li>Start the node.<p>Use the Cluster CL commands found in <a href="rzaiesetha_cl.htm">Set up a cluster using clustering CL commands for HTTP Server</a> or use the IBM Simple Cluster Management interface available
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through <a href="../rzahg/rzahginav.htm">iSeries
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Navigator</a>.</p>
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</li>
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<li>Continue to step 2.</li>
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</ol>
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</div>
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<div class="section"><h4 class="sectiontitle">Step 2 - Configure the highly available Web server</h4><p><strong>Configure
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IP addresses.</strong></p>
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<p>For each iSeries node in the cluster that a highly
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available Web server will be running on, configure the IP address that the
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Web server will be using. This can be done using the <tt><strong>CFGTCP</strong></tt> CL
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command. You should configure one IP address for each unique Web server. Each
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Web server is configured to a dedicated TCP/IP line interface. When using
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the Network Dispatcher model or comparable IP director with either HAModel
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IPTakeoverWithDispatcher of PurePeer model, the IP Line interface should be
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typed <tt><strong>*VIRTUALIP</strong></tt>. See <a href="../rzahg/rzahgictcp2.htm" target="_blank">TCP/IP</a> for more information.</p>
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<ol><li>Start the <span>IBM Web Administration for i5/OS interface</span>.</li>
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<li>Click the <strong>Manage</strong> tab.</li>
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<li>Click the <span class="uicontrol">HTTP Servers</span> subtab.</li>
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<li>Select your HTTP Server (powered by Apache) from the <strong>Server</strong> list.</li>
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<li>Select the <a href="rzaiecontext.htm">context</a> you
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want to work with from the <strong>Server area</strong> list.</li>
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<li>Expand <strong>Server Properties</strong>.</li>
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<li>Click <strong>General Server Configuration</strong>.</li>
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<li>Click the <strong>General Settings</strong> tab in the form.</li>
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<li>Click <strong>Add</strong> under the <strong>Server IP addresses and ports to listen</strong> on
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table.<div class="note"><span class="notetitle">Note:</span> Directive <a href="rzaiemod_core.htm#HotBackup">HotBackup</a> will be set to <em>off</em> and
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ignored if currently configured for your HTTP Server (powered by Apache).</div>
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<div class="p">You
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may want to perform the next steps on one iSeries and copy (for example using
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FTP or NetServer™)
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the HTTP Server (powered by Apache) configuration and instance files to each
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iSeries server where the highly available HTTP Server will be running in the
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cluster. The files that must be copied are:<ul><li>/www/server_name/conf/server_name.conf </li>
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<li>/QSYS.LIB/QUSRSYS.LIB/QATMINSTC.FILE/instance_name.MBR </li>
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</ul>
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</div>
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</li>
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<li>Add the IP address the highly available Web server will be running on.</li>
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<li>Click <strong>OK</strong>.</li>
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</ol>
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<p><strong>Configure highly available HTTP Server (powered by Apache)</strong></p>
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<ol><li>Start the <span>IBM Web Administration for i5/OS interface</span>.</li>
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<li>Click the <strong>Manage</strong> tab.</li>
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<li>Click the <span class="uicontrol">HTTP Servers</span> subtab.</li>
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<li>Select your HTTP Server (powered by Apache) from the <strong>Server</strong> list.</li>
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<li>Select the <a href="rzaiecontext.htm">context</a> you
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want to work with from the <strong>Server area</strong> list.</li>
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<li>Expand <strong>Server Properties</strong>.</li>
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<li>Click <strong>System Resources</strong>.</li>
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<li>Click the <strong>Highly Available Server</strong> tab in the form.</li>
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<li>Specify one specific server IP address to listen on.</li>
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<li>Click <strong>Enable HTTP server</strong> to be highly available.</li>
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<li>Select a highly available model.<div class="note"><span class="notetitle">Note:</span> If you are implementing the primary/backup
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with network dispatcher model or the peer model, configure the network dispatcher
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according to the existing cluster nodes and the configured Web server.</div>
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</li>
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<li><strong>Optional</strong>: Click<strong> Enable highly available CGI program</strong>.</li>
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<li>Enter your liveness monitor settings. The <a href="rzaiemod_ha.htm#lmurlcheck">LMUrlCheck</a> directive is required. The other
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LM directives have defaults.</li>
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<li>Click <strong>OK</strong>.</li>
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<li>Continue to step 3.</li>
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</ol>
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</div>
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<div class="section"><h4 class="sectiontitle">Step 3 - Start highly available HTTP Server (powered by Apache)</h4><p>Start
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your highly available HTTP Server (powered by Apache).</p>
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<ol><li>Start a 5250 session on the iSeries you are going to use the highly available
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HTTP Server (powered by Apache).</li>
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<li>Use <strong><tt>STRTCPSVR</tt></strong> CL command on the appropriate node.</li>
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<li>Continue to step 4.</li>
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</ol>
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<div class="note"><span class="notetitle">Note:</span> In the case of the primary/backup model, the first highly available
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server to be started will automatically assume the role of the primary. The
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second highly available server to be started will automatically assume the
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role of the backup.</div>
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</div>
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<div class="section"><h4 class="sectiontitle">Step 4 - Manage your highly available HTTP Server (powered
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by Apache)</h4><p>Use the <strong><tt>ENDTCPSVR</tt></strong> CL command on the appropriate
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node or use the IBM Simple Cluster Management interface available through <a href="../rzahg/rzahginav.htm">iSeries Navigator</a> to stop
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or end your highly available HTTP Server (powered by Apache). In the case
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of primary/backup model depending on which server you are ending this may
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or may not force a fail over. Ending the primary server with a backup server
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running will force a fail over from primary to backup to occur. Ending the
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backup will only affect the backup server. Ending the primary server with
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no backup will end the primary server. In the case of PurePeer model only
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the server you are ending will be affected as any other peer servers will
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continue to process client requests. See <a href="rzaiesetha_cl.htm">Set up a cluster using clustering CL commands for HTTP Server</a> and <a href="../rzaig/rzaigicclust.htm">Clusters</a> for
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more information.</p>
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<div class="note"><span class="notetitle">Note:</span> In the case of primary/backup model, it is possible
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to determine which highly available Web server is the primary or backup server.
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The QBATCH subsystem will have a job running named <strong><tt>QZHBEXPG</tt></strong> on
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the primary node only. For the client data it is suggested that you set up
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a method to automatically publish static files to each Web server. Static
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files include HTML and highly available CGI programs.</div>
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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="rzaieparhttp.htm" title="This topic provides step-by-step tasks for HTTP Server.">HTTP Server tasks</a></div>
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</div>
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</div>
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</body>
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