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and cluster</a></li> +</ul> +</div> +</div> +<div id="content"> +<div class="sect3"> +<h4 id="_ha_failover_and_cluster">HA/failover and cluster</h4> +<div class="paragraph"> +<p>Apache Karaf natively provides a failover mechanism. It uses a kind of master/slave topology where one instance is active +and the others are in standby.</p> +</div> +<div class="paragraph"> +<p>If you are looking for cluster of Apache Karaf instances (active/active), [Apache Karaf Cellar|http://karaf.apache.org/index/subprojects/cellar.html] is a solution.</p> +</div> +<div class="paragraph"> +<p>Karaf provides failover capability using either a simple lock file or a JDBC locking mechanism. +In both cases, a container-level lock system allows bundles to be preloaded into the slave Karaf instance in order to provide faster failover performance.</p> +</div> +<div class="sect4"> +<h5 id="_ha_failover_active_passive">HA/failover (active/passive)</h5> +<div class="paragraph"> +<p>The Apache Karaf failover capability uses a lock system.</p> +</div> +<div class="paragraph"> +<p>This container-level lock system allows bundles installed on the master to be preloaded on the slave, in order to provide faster failover performance.</p> +</div> +<div class="paragraph"> +<p>Two types of lock are supported:</p> +</div> +<div class="ulist"> +<ul> +<li> +<p>filesystem lock</p> +</li> +<li> +<p>database lock</p> +</li> +</ul> +</div> +<div class="paragraph"> +<p>When a first instance starts, if the lock is available, it takes the lock and become the master. +If a second instance starts, it tries to acquire the lock. As the lock is already hold by the master, the instance becomes +a slave, in standby mode (not active). A slave periodically check if the lock has been released or not.</p> +</div> +<div class="sect5"> +<h6 id="_filesystem_lock">Filesystem lock</h6> +<div class="paragraph"> +<p>The Apache Karaf instances share a lock on the filesystem. It means that the filesystem storing the lock has to be accessible +to the different instances (using SAN, NFS, …​).</p> +</div> +<div class="paragraph"> +<p>The configuration of the lock system has to be defined in the <code>etc/system.properties</code> file, on each instance (master/slave):</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre>karaf.lock=true +karaf.lock.class=org.apache.karaf.main.lock.SimpleFileLock +karaf.lock.dir=<PathToLockFileDirectory> +karaf.lock.delay=10000</pre> +</div> +</div> +<div class="ulist"> +<ul> +<li> +<p><code>karaf.lock</code> property enables the the HA/failover mechanism</p> +</li> +<li> +<p><code>karaf.lock.class</code> property contains the class name providing the lock implementation. Here, we use the filesystem lock.</p> +</li> +<li> +<p><code>karaf.lock.dir</code> property contains the location where the lock will be written. All instances have to share the same lock.</p> +</li> +<li> +<p><code>karaf.lock.delay</code> property is the interval period (in milliseconds) to check if the lock has been released or not.</p> +</li> +</ul> +</div> +</div> +<div class="sect5"> +<h6 id="_database_lock">Database lock</h6> +<div class="paragraph"> +<p>It’s not always possible and easy to have a shared filesystem between multiple Apache Karaf instances.</p> +</div> +<div class="paragraph"> +<p>Instead of sharing a filesystem, Apache Karaf supports sharing a database.</p> +</div> +<div class="paragraph"> +<p>The master instance holds the lock by locking a table in the database. If the master loses the lock, a waiting slave +gains access to the locking table, acquire the lock on the table and starts.</p> +</div> +<div class="paragraph"> +<p>The database lock uses JDBC (Java DataBase Connectivity). To use database locking, you have to:</p> +</div> +<div class="ulist"> +<ul> +<li> +<p>copy the JDBC driver in the <code>lib/ext</code> folder on each instance. The JDBC driver to use is the one corresponding to the +database used for the locking system.</p> +</li> +<li> +<p>update <code>etc/system.properties</code> file on each instance:</p> +</li> +</ul> +</div> +<div class="listingblock"> +<div class="content"> +<pre>karaf.lock=true +karaf.lock.class=org.apache.karaf.main.lock.DefaultJDBCLock +karaf.lock.level=50 +karaf.lock.delay=10000 +karaf.lock.jdbc.url=jdbc:derby://dbserver:1527/sample +karaf.lock.jdbc.driver=org.apache.derby.jdbc.ClientDriver +karaf.lock.jdbc.user=user +karaf.lock.jdbc.password=password +karaf.lock.jdbc.table=KARAF_LOCK +karaf.lock.jdbc.clustername=karaf +karaf.lock.jdbc.timeout=30</pre> +</div> +</div> +<div class="ulist"> +<ul> +<li> +<p><code>karaf.lock</code> property enabled the HA/failover mechanism</p> +</li> +<li> +<p><code>karaf.lock.class</code> property contains the class name providing the lock implementation. The <code>org.apache.karaf.main.lock.DefaultJDBCLock</code> +is the most generic database lock system implementation. Apache Karaf supports lock system for specific databases (see later for details).</p> +</li> +<li> +<p><code>karaf.lock.level</code> property is the container-level locking (see later for details).</p> +</li> +<li> +<p><code>karaf.lock.delay</code> property is the interval period (in milliseconds) to check if the lock has been released or not.</p> +</li> +<li> +<p><code>karaf.lock.jdbc.url</code> property contains the JDBC URL to the database (derby in this example).</p> +</li> +<li> +<p><code>karaf.lock.jdbc.driver</code> property contains the class name of the JDBC driver to use (derby in this example).</p> +</li> +<li> +<p><code>karaf.lock.jdbc.user</code> property contains the username to use to connect to the database.</p> +</li> +<li> +<p><code>karaf.lock.jdbc.password</code> property contains the password to use to connet to the database.</p> +</li> +<li> +<p><code>karaf.lock.jdbc.table</code> property contains the database table to use for the lock. Karaf will first try to find the table as specified in this property, +and if not found, it will try the table name in lower and upper case.</p> +</li> +</ul> +</div> +<div class="admonitionblock note"> +<table> +<tr> +<td class="icon"> +<div class="title">Note</div> +</td> +<td class="content"> +<div class="paragraph"> +<p>Apache Karaf won’t start if the JDBC driver is not present in the <code>lib/ext</code> folder.</p> +</div> +</td> +</tr> +</table> +</div> +<div class="admonitionblock note"> +<table> +<tr> +<td class="icon"> +<div class="title">Note</div> +</td> +<td class="content"> +<div class="paragraph"> +<p>The <code>sample</code> database will be created automatically if it does not exist.</p> +</div> +</td> +</tr> +</table> +</div> +<div class="admonitionblock note"> +<table> +<tr> +<td class="icon"> +<div class="title">Note</div> +</td> +<td class="content"> +<div class="paragraph"> +<p>If the connection to the database is lost, the master instance tries to gracefully shutdown, allowing a slave instance to +become the master when the database is back. The former master instance will required a manual restart.</p> +</div> +</td> +</tr> +</table> +</div> +<div class="paragraph"> +<p><strong>Lock on Oracle</strong></p> +</div> +<div class="paragraph"> +<p>Apache Karaf supports Oracle database for locking. The lock implementation class name to use is <code>org.apache.karaf.main.lock.OracleJDBCLock</code>:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre>karaf.lock=true +karaf.lock.class=org.apache.karaf.main.lock.OracleJDBCLock +karaf.lock.jdbc.url=jdbc:oracle:thin:@hostname:1521:XE +karaf.lock.jdbc.driver=oracle.jdbc.OracleDriver +karaf.lock.jdbc.user=user +karaf.lock.jdbc.password=password +karaf.lock.jdbc.table=KARAF_LOCK +karaf.lock.jdbc.clustername=karaf +karaf.lock.jdbc.timeout=30</pre> +</div> +</div> +<div class="paragraph"> +<p>The Oracle JDBC driver file (<code>ojdbc*.jar</code>) has to be copied in the <code>lib/ext</code>Â folder.</p> +</div> +<div class="admonitionblock note"> +<table> +<tr> +<td class="icon"> +<div class="title">Note</div> +</td> +<td class="content"> +<div class="paragraph"> +<p>The <code>karaf.lock.jdbc.url</code> property contains a JDBC URL which requires an active SID. It means that you must manually create the Oracle +database instance first before using the lock mechanism.</p> +</div> +</td> +</tr> +</table> +</div> +<div class="paragraph"> +<p><strong>Lock on Derby</strong></p> +</div> +<div class="paragraph"> +<p>Apache Karaf supports Apache Derby database for locking. The lock implementation class name to use is <code>org.apache.karaf.main.lock.DerbyJDBCLock</code>:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre>karaf.lock=true +karaf.lock.class=org.apache.karaf.main.lock.DerbyJDBCLock +karaf.lock.jdbc.url=jdbc:derby://127.0.0.1:1527/dbname +karaf.lock.jdbc.driver=org.apache.derby.jdbc.ClientDriver +karaf.lock.jdbc.user=user +karaf.lock.jdbc.password=password +karaf.lock.jdbc.table=KARAF_LOCK +karaf.lock.jdbc.clustername=karaf +karaf.lock.jdbc.timeout=30</pre> +</div> +</div> +<div class="paragraph"> +<p>The Derby JDBC driver file name has to be copied in the <code>lib/ext</code> folder.</p> +</div> +<div class="paragraph"> +<p><strong>Lock on MySQL</strong></p> +</div> +<div class="paragraph"> +<p>Apache Karaf supports MySQL database for locking. The lock implementation class name to use is <code>org.apache.karaf.main.lock.MySQLJDBCLock</code>:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre>karaf.lock=true +karaf.lock.class=org.apache.karaf.main.lock.MySQLJDBCLock +karaf.lock.jdbc.url=jdbc:mysql://127.0.0.1:3306/dbname +karaf.lock.jdbc.driver=com.mysql.jdbc.Driver +karaf.lock.jdbc.user=user +karaf.lock.jdbc.password=password +karaf.lock.jdbc.table=KARAF_LOCK +karaf.lock.jdbc.clustername=karaf +karaf.lock.jdbc.timeout=30</pre> +</div> +</div> +<div class="paragraph"> +<p>The MySQL JDBC driver file name has to be copied in <code>lib/ext</code> folder.</p> +</div> +<div class="paragraph"> +<p><strong>Lock on PostgreSQL</strong></p> +</div> +<div class="paragraph"> +<p>Apache Karaf supports PostgreSQL database for locking. The lock implementation class name to use is <code>org.apache.karaf.main.lock.PostgreSQLJDBCLock</code>:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre>karaf.lock=true +karaf.lock.class=org.apache.karaf.main.lock.PostgreSQLJDBCLock +karaf.lock.jdbc.url=jdbc:postgresql://127.0.0.1:1527/dbname +karaf.lock.jdbc.driver=org.postgresql.Driver +karaf.lock.jdbc.user=user +karaf.lock.jdbc.password=password +karaf.lock.jdbc.table=KARAF_LOCK +karaf.lock.jdbc.clustername=karaf +karaf.lock.jdbc.timeout=0</pre> +</div> +</div> +<div class="paragraph"> +<p>The PostgreSQL JDBC driver file has to be copied in the <code>lib/ext</code> folder.</p> +</div> +<div class="paragraph"> +<p><strong>Lock on Microsoft SQLServer</strong></p> +</div> +<div class="paragraph"> +<p>Apache Karaf supports Microsoft SQLServer database for locking. The lock implementation class name to use is <code>org.apache.karaf.main.lock.SQLServerJDBCLock</code>:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre>karaf.lock=true +karaf.lock.class=org.apache.karaf.main.lock.SQLServerJDBCLock +karaf.lock.level=50 +karaf.lock.delay=10000 +karaf.lock.jdbc.url=jdbc:jtds:sqlserver://127.0.0.1;databaseName=sample +karaf.lock.jdbc.driver=net.sourceforge.jtds.jdbc.Driver +karaf.lock.jdbc.user=user +karaf.lock.jdbc.password=password +karaf.lock.jdbc.table=KARAF_LOCK +karaf.lock.jdbc.clustername=karaf +karaf.lock.jdbc.timeout=30</pre> +</div> +</div> +<div class="paragraph"> +<p>The JTDS JDBC driver file has to be copied in the <code>lib/ext</code> folder.</p> +</div> +</div> +<div class="sect5"> +<h6 id="_container_level_locking">Container-level locking</h6> +<div class="paragraph"> +<p>Apache Karaf supports container-level locking. It allows bundles to be preloaded into the slave instance. +Thanks to that, switching to a slave instance is very fast as the slave instance already contains all required bundles.</p> +</div> +<div class="paragraph"> +<p>The container-level locking is supported in both filesystem and database lock mechanisms.</p> +</div> +<div class="paragraph"> +<p>The container-level locking uses the <code>karaf.lock.level</code> property:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre>karaf.lock.level=50</pre> +</div> +</div> +<div class="paragraph"> +<p>The <code>karaf.lock.level</code> property tells the Karaf instance how far up the boot process to bring the OSGi container. +All bundles with an ID equals or lower to this start level will be started in that Karaf instance.</p> +</div> +<div class="paragraph"> +<p>As reminder, the bundles start levels are specified in <code>etc/startup.properties</code>, in the <code>url=level</code> format.</p> +</div> +<table class="tableblock frame-all grid-all spread"> +<colgroup> +<col style="width: 50%;"> +<col style="width: 50%;"> +</colgroup> +<thead> +<tr> +<th class="tableblock halign-left valign-top">Level</th> +<th class="tableblock halign-left valign-top">Behavior</th> +</tr> +</thead> +<tbody> +<tr> +<td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td> +<td class="tableblock halign-left valign-top"><p class="tableblock">A 'cold' standby instance. Core bundles are not loaded into container. Slaves will wait until lock acquired to start server.</p></td> +</tr> +<tr> +<td class="tableblock halign-left valign-top"><p class="tableblock"><50</p></td> +<td class="tableblock halign-left valign-top"><p class="tableblock">A 'hot' standby instance. Core bundles are loaded into the container. Slaves will wait until lock acquired to start user level bundles. The console will be accessible for each slave instance at this level.</p></td> +</tr> +<tr> +<td class="tableblock halign-left valign-top"><p class="tableblock">>50</p></td> +<td class="tableblock halign-left valign-top"><p class="tableblock">This setting is not recommended as user bundles will end up being started.</p></td> +</tr> +</tbody> +</table> +<div class="admonitionblock note"> +<table> +<tr> +<td class="icon"> +<div class="title">Note</div> +</td> +<td class="content"> +<div class="paragraph"> +<p>Using 'hot' standby means that the slave instances are running and bind some ports. So, if you use master and slave instances on the same machine, you have +to update the slave configuration to bind the services (ssh, JMX, etc) on different port numbers.</p> +</div> +</td> +</tr> +</table> +</div> +</div> +</div> +<div class="sect4"> +<h5 id="_cluster_active_active">Cluster (active/active)</h5> +<div class="paragraph"> +<p>Apache Karaf doesn’t natively support cluster. By cluster, we mean several active instances, synchronized with each other.</p> +</div> +<div class="paragraph"> +<p>However, <a href="http://karaf.apache.org/index/subprojects/cellar.html";>Apache Karaf Cellar</a> can be installed to provide cluster support.</p> +</div> +</div> +</div> +</div> +<div id="footer"> +<div id="footer-text"> +Last updated 2016-04-27 13:59:28 CEST +</div> +</div> +</body> +</html> \ No newline at end of file
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Contributions</a></li> +</ul> +</div> +</div> +<div id="content"> +<div class="sect2"> +<h3 id="_github_contributions">Github Contributions</h3> +<div class="paragraph"> +<p>Some people prefer to make contributions to karaf source via github. If you are one of them, this is for you!</p> +</div> +<div class="sect3"> +<h4 id="_introduction">Introduction</h4> +<div class="paragraph"> +<p>Apache Karaf is available as a periodically replicated mirror on: <a href="https://github.com/apache/karaf"; class="bare">https://github.com/apache/karaf</a></p> +</div> +</div> +<div class="sect3"> +<h4 id="_suggested_workflow">Suggested Workflow</h4> +<div class="olist arabic"> +<ol class="arabic"> +<li> +<p>Make a fork of karaf repo github mirror</p> +</li> +<li> +<p>Do all your new work on your own karaf fork</p> +</li> +<li> +<p>When ready, file a Jira issue <a href="https://issues.apache.org/jira/browse/KARAF"; class="bare">https://issues.apache.org/jira/browse/KARAF</a>, attach the link to your github pull request, and ask for a review</p> +</li> +<li> +<p>One of karaf committers will discuss your pull request on github; and at some point your pull request will be accepted</p> +</li> +<li> +<p>When your pull request is accepted, squash it into a single commit and attach single patch file to the original jira, with ASF grant check box selected</p> +</li> +<li> +<p>Now pray to your favorite ASF committer to really accept the patch :-)</p> +</li> +<li> +<p>When your patch is committed to the svn, and you can verify it in the latest karaf snapshot, close your pull request on github</p> +</li> +</ol> +</div> +</div> +<div class="sect3"> +<h4 id="_license_reminder">License Reminder</h4> +<div class="paragraph"> +<p>In order for your contributions to be accepted:</p> +</div> +<div class="ulist"> +<ul> +<li> +<p>All files must contain ASL license grant header</p> +</li> +<li> +<p>You must select ASF grant check box when attaching patch to the jira</p> +</li> +</ul> +</div> +</div> +<div class="sect3"> +<h4 id="_how_to_generate_a_one_file_patch_via_throw_away_branch">How to Generate a One-File-Patch Via Throw-Away Branch</h4> +<div class="paragraph"> +<p>Here is one way to generate squash of your commits:</p> +</div> +<div class="paragraph"> +<p><a href="http://stackoverflow.com/questions/616556/how-do-you-squash-commits-into-one-patch-with-git-format-patch"; class="bare">http://stackoverflow.com/questions/616556/how-do-you-squash-commits-into-one-patch-with-git-format-patch</a></p> +</div> +<div class="listingblock"> +<div class="content"> +<pre># +# 'archon' referers to karaf mirror +# 'origin' referers to your own fork +# + +# attach karaf mirror as remote, if not done yet +git remote add archon https://github.com/apache/karaf + +# fetch latest karaf mirror +git fetch archon + +# ensure you are on your fork trunk +git checkout origin/trunk + +# kill previous patch delivery, if you had one +git branch -D delivery + +# make new delivery throw-away branch, based on latest karaf mirror +git branch delivery archon/trunk + +# use it +git checkout delivery + +# squash all your local development into a single commit +git merge --squash trunk + +# commit it to the delivery branch +git commit -m "delivery" + +# generate a patch file against the mirror +git format-patch archon/trunk</pre> +</div> +</div> +<div class="paragraph"> +<p>root of your Karaf source now contains a file named "0001-delivery.patch.txt" (please attach the .txt ending;this will allow commiters to open your patch directly in the browser and give it a short look there) which you should attach to your karaf jira, and ask to commit to the svn trunk</p> +</div> +</div> +</div> +</div> +<div id="footer"> +<div id="footer-text"> +Last updated 2016-04-27 13:59:28 CEST +</div> +</div> +</body> +</html> \ No newline at end of file
