88 lines
5.5 KiB
HTML
88 lines
5.5 KiB
HTML
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" 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="dc.language" scheme="rfc1766" 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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<meta name="dc.date" scheme="iso8601" content="2005-09-06" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow"/>
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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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<title>Directory Server (LDAP) - Create a complex topology with peer replication</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<a name="rzahyp2p"></a>
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<h3 id="rzahyp2p">Create a complex topology with peer replication</h3>
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<p>Peer replication is a replication topology in which multiple servers are
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masters. However, unlike a multi-master environment, no conflict resolution
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is done among peer servers. LDAP servers accept the updates provided by
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peer servers, and update their own copies of the data. No consideration is
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given for the order the updates are received, or whether multiple updates
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conflict.</p>
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<p>To add additional masters (peers), you first add the server as a read-only
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replica of the existing masters (see <a href="rzahycreaterep.htm#rzahycreaterep">Create a replica server</a>), initialize
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the directory data, and then promote the server to be a master (see <a href="rzahypromote.htm#rzahypromote">Move or promote a server</a>).</p>
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<p>Initially, the <span class="bold">ibm-replicagroup</span> object
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created by this process inherits the ACL of the root entry for the replicated
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subtree. These ACLs might be inappropriate for controlling access to the
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replication information in the directory.</p>
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<p>For the Add subtree operation to be successful, the entry DN which you
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are adding must have correct ACLs, if it is not a suffix in the server.</p>
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<dl>
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<dt class="bold">For Non-filtered ACLs :</dt>
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<dd>
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<ul>
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<li>ownersource : <<span class="italic">the entry DN</span>></li>
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<li>ownerpropagate : TRUE</li>
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<li>aclsource : <<span class="italic">the entry DN</span>></li>
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<li>aclpropagate: TRUE</li></ul>
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</dd>
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<dt class="bold">Filtered ACLs :</dt>
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<dd>
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<ul>
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<li>ownersource : <<span class="italic">the entry DN</span>></li>
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<li>ownerpropagate : TRUE</li>
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<li>ibm-filteraclinherit : FALSE</li>
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<li>ibm-filteraclentry : <<span class="italic">any value</span>></li></ul>
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</dd>
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</dl>
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<p>Use the <span class="bold">Edit ACLs</span> function of the Web administration
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tool to set ACLs for the replication information associated with the newly
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created replicated subtree (see <a href="rzahyrepacl.htm#rzahyrepacl">Edit access control lists</a>).</p>
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<p>The replica is in a suspended state and no replication is occurring. After
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you have finished setting up your replication topology, you must click <span class="bold">Manage queues</span>, select the replica and click <span class="bold">Suspend/resume</span> to start replication. See <a href="rzahyqueues.htm#rzahyqueues">Manage queues</a> for more detailed information. The replica now receives
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updates from the master.</p>
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<p>Use peer replication only in environments where the pattern of directory
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updates is well known. Updates to particular objects within the directory
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must be done only by one peer server. This is intended to prevent the scenario
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of one server deleting an object, followed by another server modifying the
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object. This scenario creates the possibility of a peer server receiving
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a delete command followed by a modify command; which creates a conflict.</p>
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<p>To define a peer-forwarder-replica topology, consisting of two peer-master
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servers, two forwarding servers, and four replicas you must: </p>
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<ol type="1">
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<li>Created a master server and a replica server. See <a href="rzahymasterrep.htm#rzahymasterrep">Create a master-replica topology</a>.</li>
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<li>Create two additional replica servers for the master server. See <a href="rzahycreaterep.htm#rzahycreaterep">Create a replica server</a>.</li>
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<li>Create two replicas under each of the two newly created replica servers.</li>
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<li>Promote the original replica to a master. See <a href="rzahypromoteserver.htm#rzahypromoteserver">Promote a server to be a peer</a>.
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<a name="wq248"></a>
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<div class="notetitle" id="wq248">Note:</div>
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<div class="notebody">The server that you want to promote to a master must be a leaf replica
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with no subordinate replicas.</div></li>
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<li>Copy the data from the master to the new master and replicas. See <a href="rzahyexportdata.htm#rzahyexportdata">Copy data to the replica</a>.</li></ol>
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<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
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</body>
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</html>
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