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           <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">10.3.&#160;Creating a group</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-High-Availability-OverviewOfHA.html">Prev</a>&#160;</td><th align="center" width="60%">Chapter&#160;10.&#160;High Availability</th><td align="right" width="20%">&#160;<a accesskey="n" href="Java-Broker-High-Availability-Behaviour.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="Java-Broker-High-Availability-CreatingGroup"></a>10.3.&#160;Creating a group</h2></div></div></div><p>This section describes how to create a group. At a high level, creating a group involves
       first creating the first node standalone, then creating subsequent nodes referencing the first
       node so the nodes can introduce themselves and gradually the group is built up.</p><p>A group is created through either <a class="link" href="Java-Broker-Management-Channel-Web-Console.html" title="6.2.&#160;Web Management Console">Web Management</a> or the <a class="link" href="Java-Broker-Management-Channel-REST-API.html" title="6.3.&#160;REST API">REST API</a>. These instructions
       presume you are using Web Management. To illustrate the example it builds the group
       illustrated in figure <a class="xref" href="Java-Broker-High-Availability-OverviewOfHA.html#Java-Broker-High-Availability-OverviewOfHA-Figure" title="Figure&#160;10.1.&#160;3-node group deployed across three Brokers.">Figure&#160;10.1, &#8220;3-node group deployed across three Brokers.&#8221;</a></p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><p>Install a Broker on each machine that will be used to host the group. As messaging
             clients will need to be able to connect to and authentication to all Brokers, it usually
             makes sense to choose a common authentication mechanism e.g. Simple LDAP Authentication,
             External with SSL client authentication or Kerberos.</p></li><li class="listitem"><p>Select one Broker instance to host the first node instance. This choice is an
             arbitrary one. The node is special only whilst creating group. Once creation is
             complete, all nodes will be considered equal.</p></li><li class="listitem"><p>Click the <code class="literal">Add</code> button on the Virtualhost Panel on the Broker
             tab.</p><p>
             </p><div class="orderedlist"><ol class="orderedlist" type="a"><li class="listitem"><p>Give the Virtualhost node a unique name e.g. <code class="literal">weather1</code>. The
                   name must be unique within the group and unique to that Broker. It is best if the
                   node names are chosen from a different nomenclature than the machine names
                   themselves.</p></li><li class="listitem"><p>Choose <code class="literal">BDB_HA</code> and select <code class="literal">New group</code>
                 </p></li><li class="listitem"><p>Give the group a name e.g. <code class="literal">weather</code>. The group name must be
                   unique and will be the name also given to the virtualhost, so this is the name the
                   messaging clients will use in their connection url.</p></li><li class="listitem"><p>Give the address of this node. This is an address on this node's host that
                   will be used for replication purposes. The hostname <span class="emphasis"><em>must</em></span> be
                   resolvable by all the other nodes in the group. This is separate from the address
                   used by messaging clients to connect to the Broker. It is usually best to choose a
                   symbolic name, rather than an IP address.</p></li><li class="listitem"><p>Now add the node addresses of all the other nodes that will form the group. In
                   our example we are building a three node group so we give the node addresses of
                     <code class="literal">chaac:5000</code> and <code class="literal">indra:5000</code>.</p></li><li class="listitem"><p>Click Add to create the node. The virtualhost node will be created with the
                   virtualhost. As there is only one node at this stage, the role will be
                   master.</p></li></ol></div><p>
             </p><div class="figure"><a id="d0e6704"></a><p class="title"><strong>Figure&#160;10.2.&#160;Creating 1st node in a group</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Creating 1st node in a group" src="images/HA-Create-1.png" /></div></div></div><p><br class="figure-break" />
           </p></li><li class="listitem"><p>Now move to the second Broker to be the group. Click the <code class="literal">Add</code>
             button on the Virtualhost Panel on the Broker tab of the second Broker.</p><p>
             </p><div class="orderedlist"><ol class="orderedlist" type="a"><li class="listitem"><p>Give the Virtualhost node a unique name e.g.
                   <code class="literal">weather2</code>.</p></li><li class="listitem"><p>Choose <code class="literal">BDB_HA</code> and choose <code class="literal">Existing group</code>
                 </p></li><li class="listitem"><p>Give the details of the <span class="emphasis"><em>existing node</em></span>. Following our
                   example, specify <code class="literal">weather</code>, <code class="literal">weather1</code> and
                     <code class="literal">thor:5000</code></p></li><li class="listitem"><p>Give the address of this node.</p></li><li class="listitem"><p>Click Add to create the node. The node will use the existing details to
                   contact it and introduce itself into the group. At this stage, the group will have
                   two nodes, with the second node in the replica role.</p></li><li class="listitem"><p>Repeat these steps until you have added all the nodes to the group.</p></li></ol></div><p>
             </p><div class="figure"><a id="d0e6762"></a><p class="title"><strong>Figure&#160;10.3.&#160;Adding subsequent nodes to the group</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Adding subsequent nodes to the group" src="images/HA-Create-2.png" /></div></div></div><p><br class="figure-break" />
           </p></li></ol></div><p>The group is now formed and is ready for us. Looking at the virtualhost node of any of the
       nodes shows a complete view of the whole group. </p><div class="figure"><a id="d0e6774"></a><p class="title"><strong>Figure&#160;10.4.&#160;View of group from one node</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="View of group from one node" src="images/HA-Create-3.png" /></div></div></div><p><br class="figure-break" /></p></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-High-Availability-OverviewOfHA.html">Prev</a>&#160;</td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td align="right" width="40%">&#160;<a accesskey="n" href="Java-Broker-High-Availability-Behaviour.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">10.2.&#160;High Availability Overview&#160;</td><td align="center" width="20%"><a accesskey="h" href="Apache-Qpid-Broker-J-Book.html">Home</a></td><td align="right" valign="top" width="40%">&#160;10.4.&#160;Behaviour of the Group</td></tr></table></div></div>

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	<div id="-middle-content">
	<div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">10.3. Creating a group</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-High-Availability-OverviewOfHA.html">Prev</a> </td><th align="center" width="60%">Chapter 10. High Availability</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-High-Availability-Behaviour.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="Java-Broker-High-Availability-CreatingGroup"></a>10.3. Creating a group</h2></div></div></div><p>This section describes how to create a group. At a high level, creating a group involves
	first creating the first node standalone, then creating subsequent nodes referencing the first
	node so the nodes can introduce themselves and gradually the group is built up.</p><p>A group is created through either <a class="link" href="Java-Broker-Management-Channel-Web-Console.html" title="6.2. Web Management Console">Web Management</a> or the <a class="link" href="Java-Broker-Management-Channel-REST-API.html" title="6.3. REST API">REST API</a>. These instructions
	presume you are using Web Management. To illustrate the example it builds the group
	illustrated in figure <a class="xref" href="Java-Broker-High-Availability-OverviewOfHA.html#Java-Broker-High-Availability-OverviewOfHA-Figure" title="Figure 10.1. 3-node group deployed across three Brokers.">Figure 10.1, “3-node group deployed across three Brokers.”</a></p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><p>Install a Broker on each machine that will be used to host the group. As messaging
	clients will need to be able to connect to and authentication to all Brokers, it usually
	makes sense to choose a common authentication mechanism e.g. Simple LDAP Authentication,
	External with SSL client authentication or Kerberos.</p></li><li class="listitem"><p>Select one Broker instance to host the first node instance. This choice is an
	arbitrary one. The node is special only whilst creating group. Once creation is
	complete, all nodes will be considered equal.</p></li><li class="listitem"><p>Click the <code class="literal">Add</code> button on the Virtualhost Panel on the Broker
	tab.</p><p>
	</p><div class="orderedlist"><ol class="orderedlist" type="a"><li class="listitem"><p>Give the Virtualhost node a unique name e.g. <code class="literal">weather1</code>. The
	name must be unique within the group and unique to that Broker. It is best if the
	node names are chosen from a different nomenclature than the machine names
	themselves.</p></li><li class="listitem"><p>Choose <code class="literal">BDB_HA</code> and select <code class="literal">New group</code>
	</p></li><li class="listitem"><p>Give the group a name e.g. <code class="literal">weather</code>. The group name must be
	unique and will be the name also given to the virtualhost, so this is the name the
	messaging clients will use in their connection url.</p></li><li class="listitem"><p>Give the address of this node. This is an address on this node's host that
	will be used for replication purposes. The hostname <span class="emphasis"><em>must</em></span> be
	resolvable by all the other nodes in the group. This is separate from the address
	used by messaging clients to connect to the Broker. It is usually best to choose a
	symbolic name, rather than an IP address.</p></li><li class="listitem"><p>Now add the node addresses of all the other nodes that will form the group. In
	our example we are building a three node group so we give the node addresses of
	<code class="literal">chaac:5000</code> and <code class="literal">indra:5000</code>.</p></li><li class="listitem"><p>Click Add to create the node. The virtualhost node will be created with the
	virtualhost. As there is only one node at this stage, the role will be
	master.</p></li></ol></div><p>
	</p><div class="figure"><a id="d0e6704"></a><p class="title"><strong>Figure 10.2. Creating 1st node in a group</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Creating 1st node in a group" src="images/HA-Create-1.png" /></div></div></div><p><br class="figure-break" />
	</p></li><li class="listitem"><p>Now move to the second Broker to be the group. Click the <code class="literal">Add</code>
	button on the Virtualhost Panel on the Broker tab of the second Broker.</p><p>
	</p><div class="orderedlist"><ol class="orderedlist" type="a"><li class="listitem"><p>Give the Virtualhost node a unique name e.g.
	<code class="literal">weather2</code>.</p></li><li class="listitem"><p>Choose <code class="literal">BDB_HA</code> and choose <code class="literal">Existing group</code>
	</p></li><li class="listitem"><p>Give the details of the <span class="emphasis"><em>existing node</em></span>. Following our
	example, specify <code class="literal">weather</code>, <code class="literal">weather1</code> and
	<code class="literal">thor:5000</code></p></li><li class="listitem"><p>Give the address of this node.</p></li><li class="listitem"><p>Click Add to create the node. The node will use the existing details to
	contact it and introduce itself into the group. At this stage, the group will have
	two nodes, with the second node in the replica role.</p></li><li class="listitem"><p>Repeat these steps until you have added all the nodes to the group.</p></li></ol></div><p>
	</p><div class="figure"><a id="d0e6762"></a><p class="title"><strong>Figure 10.3. Adding subsequent nodes to the group</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Adding subsequent nodes to the group" src="images/HA-Create-2.png" /></div></div></div><p><br class="figure-break" />
	</p></li></ol></div><p>The group is now formed and is ready for us. Looking at the virtualhost node of any of the
	nodes shows a complete view of the whole group. </p><div class="figure"><a id="d0e6774"></a><p class="title"><strong>Figure 10.4. View of group from one node</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="View of group from one node" src="images/HA-Create-3.png" /></div></div></div><p><br class="figure-break" /></p></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-High-Availability-OverviewOfHA.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-High-Availability-Behaviour.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">10.2. High Availability Overview </td><td align="center" width="20%"><a accesskey="h" href="Apache-Qpid-Broker-J-Book.html">Home</a></td><td align="right" valign="top" width="40%"> 10.4. Behaviour of the Group</td></tr></table></div></div>

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