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| <section> |
| <div class="page-header"> |
| <h2 id="description1">Description</h2> |
| </div> |
| <p> OpenMeetings 2.1 or later is required to use clustering. One database is used for all OpenMeetings servers, so all database tables are shared across OM instances. Certain folders should be shared between all servers to allow access to the files/recording.</p> |
| </section> |
| <section> |
| <h2 id="configuration1">Configuration</h2> |
| <ul> |
| <li> Multiple OM servers should be set up as described in <a href="installation.html" target="_blank"> <b>Installation</b> </a> </li> |
| <li>All servers should be configured to have same Time zone (To avoid Schedulers to drop user sessions as outdated) </li> |
| <li>All servers should be configured to use the same DB</li> |
| </ul> |
| <section> |
| <h3 id="network1">Network</h3> |
| <p>Multicast should be set up on all servers<br> Here are the steps for *nix like systems <a class="externalLink" href="https://blogs.agilefaqs.com/2009/11/08/enabling-multicast-on-your-macos-unix/">Reference article</a> </p> |
| <ol style="list-style-type: decimal"> |
| <li>Check your network interface supports multicast by running the following command in a terminal window: |
| <div class="source"> |
| <pre>ifconfig -a</pre> |
| </div> When you see <code>MULTICAST</code> against your network interface, it means your kernel is compiled with Multicast option and your network interface supports it. </li> |
| <li>Check if multicast routing is configured: |
| <div class="source"> |
| <pre>netstat -nr</pre> |
| </div> If you don’t see an IP in the range of <code>224.0.0.0 – 239.255.255.255</code> in the first table, it means you need to add your desired mutlicast address to your routes table. </li> |
| <li>To add the multicast address: |
| <div class="source"> |
| <pre>sudo route add -net 224.0.0.0 netmask 240.0.0.0 dev eth0</pre> |
| </div> NOTE: ensure <code>eth0</code> corresponds to your network interface name<br> Make sure you run this command on all servers you want to be multicast enabled. </li> |
| <li>Using netstat check if the multicast IP is visible in your route table (see step 2.)</li> |
| <li> Using tcpdump and ping check if your server is able to multicast.<br> Run the following command on <b>all</b> the servers. |
| <div class="source"> |
| <pre>sudo tcpdump -ni eth0 host 224.0.0.0</pre> |
| </div> Run the following command on <b>any</b> server. |
| <div class="source"> |
| <pre>ping -t 1 -c 2 224.0.0.0</pre> |
| </div> Check all servers receiving pings </li> |
| <li> Run |
| <div class="source"> |
| <pre>sudo route -v delete -net 224.0.0.0 netmask 240.0.0.0</pre> |
| </div> to disable multicast </li> |
| </ol> |
| </section> |
| <section> |
| <h3 id="database1">Database</h3> |
| <div> |
| All servers should be configured to use the same database. It can be on the server or on the one node of the cluster. |
| <br> |
| <div class="bd-callout bd-callout-danger"> |
| NOTE: Db other than H2 should be used |
| </div> |
| </div> |
| <ul> |
| <li>Add users who can connect to the database remotely</li> |
| <li>Update <code>/opt/om/webapps/openmeetings/WEB-INF/classes/META-INF/persistence.xml</code> set correct server address, login and password. Also uncomment following line: |
| <div class="source"> |
| <pre><property name="openjpa.RemoteCommitProvider" value="tcp(Addresses=127.0.0.1)" /></pre> |
| </div> </li> |
| </ul> |
| </section> |
| <section> |
| <h3 id="file-systems">File systems</h3> |
| <p>If files and recordings using the same physical folders the files and recordings will be available for each node. You can do this using Samba or NFS, for example. For using NFS do the following:</p> |
| <ul> |
| <li> To ease upgrade process set OM data dir to some external folder: for ex. /opt/omdata </li> |
| <li>Install NFS to the data server. In the file <code>/etc/exports</code> add the following lines: |
| <div class="source"> |
| <pre>/opt/omdata 10.1.1.2(rw,sync,no_subtree_check,no_root_squash) |
| </pre> |
| </div> Here 10.1.1.2 - is node ip for NFS remote access. Add these lines for all nodes except node with folders. </li> |
| <li> Install NFS common tools to other nodes. In the file <code>/etc/fstab</code> do the following: |
| <div class="source"> |
| <pre>10.1.1.1:/opt/omdata /opt/omdata nfs timeo=50,hard,intr |
| </pre> |
| </div> Here 10.1.1.1 – data server ip. And run the command: |
| <div class="source"> |
| <pre>mount -a</pre> |
| </div> </li> |
| </ul> |
| </section> |
| <section> |
| <h3 id="om-nodes-configuration">OM nodes configuration</h3> |
| <ol style="list-style-type: decimal"> |
| <li> <p>In the file <code>/opt/om/webapps/openmeetings/WEB-INF/classes/hazelcast.xml</code>:</p> |
| <ul> |
| <li>Set <code>instance-name</code> for each server to unique value</li> |
| <li>Set <code>server.url</code> for each server to full <b>public</b> URL of this server (please NOTE using of numeric IP address might broke HTTPS))</li> |
| <li> Comment out/delete following blocks: |
| <div class="source"> |
| <pre><network> |
| <join> |
| <auto-detection enabled="false"/> |
| <multicast enabled="false"/> |
| <tcp-ip enabled="false"/> |
| <aws enabled="false"/> |
| </join> |
| </network> |
| </pre> |
| </div> |
| <div class="source"> |
| <pre><property name="hazelcast.discovery.enabled">false</property> |
| </pre> |
| </div> </li> |
| <li> Un-comment following block (ensure it contains valip parameters): |
| <div class="source"> |
| <pre> <network> |
| <join> |
| <multicast enabled="true"> |
| <multicast-group>224.0.0.0</multicast-group> |
| <multicast-port>54327</multicast-port> |
| <multicast-time-to-live>32</multicast-time-to-live> |
| <multicast-timeout-seconds>2</multicast-timeout-seconds> |
| </multicast> |
| </join> |
| <interfaces enabled="true"> |
| <interface>192.168.1.*</interface> |
| </interfaces> |
| </network> |
| </pre> |
| </div> </li> |
| <li> In case there are more than one network interface with multicast support and/or additional hazelcast configuration is required Based on the following documentation: <a class="externalLink" href="https://docs.hazelcast.org/docs/4.0/manual/html-single/index.html">https://docs.hazelcast.org/docs/4.0/manual/html-single/index.html</a> </li> |
| </ul> </li> |
| </ol> |
| </section> |
| <section> |
| <h3 id="ensure-everything-works-as-expected">Ensure everything works as expected</h3> |
| <ul> |
| <li>Set up the cluster and login with two users, go to the same room (also check before room entering that the status page with the room list shows the correct number of participants before entering the room). You should login to the same server initially, the server will redirect you for the conference room to the appropriate server automatically. Both users should be in the same room. </li> |
| <li>Do the same with only two users but go to _different_ rooms. The calculation should send both users to different servers, cause based on the calculation two different rooms on a cluster with two nodes should go exactly one room for each node. You can now login really to node1 and node2 of your cluster while those users are loggedin and go to <code>Administration > Connections</code> and check in the column "Server Name" where they are located. They should be on different server. </li> |
| </ul> |
| <img src="images/cluster2.png" alt="" width="650" height="369" class="img-fluid"> |
| </section> |
| </section> </main> |
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| <a class="nav-link" href="#configuration1" title="Configuration">Configuration</a> |
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