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| <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="d0e6732"></a><p class="title"><strong>Figure 10.2. Creating 1st node in a group</strong></p><div class="figure-contents"><div class="mediaobject"><table border="0" style="cellpadding: 0; cellspacing: 0;" summary="manufactured viewport for HTML img" width="100%"><tr><td><img alt="Creating 1st node in a group" height="360" src="images/HA-Create-1.png" /></td></tr></table></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="d0e6790"></a><p class="title"><strong>Figure 10.3. Adding subsequent nodes to the group</strong></p><div class="figure-contents"><div class="mediaobject"><table border="0" style="cellpadding: 0; cellspacing: 0;" summary="manufactured viewport for HTML img" width="100%"><tr><td><img alt="Adding subsequent nodes to the group" height="360" src="images/HA-Create-2.png" /></td></tr></table></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="d0e6802"></a><p class="title"><strong>Figure 10.4. View of group from one node</strong></p><div class="figure-contents"><div class="mediaobject"><table border="0" style="cellpadding: 0; cellspacing: 0;" summary="manufactured viewport for HTML img" width="100%"><tr><td><img alt="View of group from one node" height="360" src="images/HA-Create-3.png" /></td></tr></table></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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