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Posted to commits@karaf.apache.org by jb...@apache.org on 2016/04/28 17:24:06 UTC
svn commit: r1741450 [1/10] - in
/karaf/site/production/manual/cellar/latest-4: ./ architecture-guide/
images/ user-guide/
Author: jbonofre
Date: Thu Apr 28 15:24:04 2016
New Revision: 1741450
URL: http://svn.apache.org/viewvc?rev=1741450&view=rev
Log:
[scm-publish] Updating main site with Karaf Cellar manual
Added:
karaf/site/production/manual/cellar/latest-4/architecture-guide/
karaf/site/production/manual/cellar/latest-4/broadcasting_commands.html
karaf/site/production/manual/cellar/latest-4/cloud.html
karaf/site/production/manual/cellar/latest-4/deploy.html
karaf/site/production/manual/cellar/latest-4/design.html
karaf/site/production/manual/cellar/latest-4/event.html
karaf/site/production/manual/cellar/latest-4/groups.html
karaf/site/production/manual/cellar/latest-4/hazelcast.html
karaf/site/production/manual/cellar/latest-4/http-balancer.html
karaf/site/production/manual/cellar/latest-4/http-session.html
karaf/site/production/manual/cellar/latest-4/images/
karaf/site/production/manual/cellar/latest-4/images/architecture.jpg (with props)
karaf/site/production/manual/cellar/latest-4/images/cross_topology.jpg (with props)
karaf/site/production/manual/cellar/latest-4/images/event_flow.jpg (with props)
karaf/site/production/manual/cellar/latest-4/images/shared_architecture.jpg (with props)
karaf/site/production/manual/cellar/latest-4/images/star_topology.jpg (with props)
karaf/site/production/manual/cellar/latest-4/index.html
karaf/site/production/manual/cellar/latest-4/installation.html
karaf/site/production/manual/cellar/latest-4/introduction.html
karaf/site/production/manual/cellar/latest-4/nodes.html
karaf/site/production/manual/cellar/latest-4/obr.html
karaf/site/production/manual/cellar/latest-4/overview.html
karaf/site/production/manual/cellar/latest-4/supported_events.html
karaf/site/production/manual/cellar/latest-4/transport.html
karaf/site/production/manual/cellar/latest-4/user-guide/
Added: karaf/site/production/manual/cellar/latest-4/broadcasting_commands.html
URL: http://svn.apache.org/viewvc/karaf/site/production/manual/cellar/latest-4/broadcasting_commands.html?rev=1741450&view=auto
==============================================================================
--- karaf/site/production/manual/cellar/latest-4/broadcasting_commands.html (added)
+++ karaf/site/production/manual/cellar/latest-4/broadcasting_commands.html Thu Apr 28 15:24:04 2016
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+</head>
+<body class="article">
+<div id="header">
+<div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+<ul class="sectlevel2">
+<li><a href="#_broadcasting_commands">Broadcasting commands</a></li>
+</ul>
+</div>
+</div>
+<div id="content">
+<div class="sect2">
+<h3 id="_broadcasting_commands">Broadcasting commands</h3>
+<div class="paragraph">
+<p>Commands are a special kind of event. They imply that when they are handled, a <code>Result</code> event will be fired
+containing the outcome of the command. For each command, we have one result per recipient.</p>
+</div>
+<div class="paragraph">
+<p>Each command contains an unique id (unique for all cluster nodes, created from Hazelcast). This id is used to correlate
+the request with the result. For each result successfully correlated the result is added to list of results
+on the command object. If the list gets full of if 10 seconds from the command execution have elapsed, the list
+is moved to a blocking queue from which the result can be retrieved.</p>
+</div>
+<div class="paragraph">
+<p>The following code snippet shows what happens when a command is sent for execution:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>public Map<node,result> execute(Command command) throws Exception {
+ if (command == null) {
+ throw new Exception("Command store not found");
+ } else {
+ //store the command to correlate it with the result.
+ commandStore.getPending().put(command.getId(), command);
+ //I create a timeout task and schedule it
+ TimeoutTask timeoutTask = new TimeoutTask(command, commandStore);
+ ScheduledFuture timeoutFuture = timeoutScheduler.schedule(timeoutTask, command.getTimeout(), TimeUnit.MILLISECONDS);
+ }
+ if (producer != null) {
+ //send the command to the topic
+ producer.produce(command);
+ //retrieve the result list from the blocking queue.
+ return command.getResult();
+ }
+ throw new Exception("Command producer not found");
+}</pre>
+</div>
+</div>
+</div>
+</div>
+<div id="footer">
+<div id="footer-text">
+Last updated 2016-03-04 11:02:10 CET
+</div>
+</div>
+</body>
+</html>
\ No newline at end of file
Added: karaf/site/production/manual/cellar/latest-4/cloud.html
URL: http://svn.apache.org/viewvc/karaf/site/production/manual/cellar/latest-4/cloud.html?rev=1741450&view=auto
==============================================================================
--- karaf/site/production/manual/cellar/latest-4/cloud.html (added)
+++ karaf/site/production/manual/cellar/latest-4/cloud.html Thu Apr 28 15:24:04 2016
@@ -0,0 +1,684 @@
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+</head>
+<body class="article">
+<div id="header">
+<div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+<ul class="sectlevel2">
+<li><a href="#_discovery_services">Discovery Services</a></li>
+</ul>
+</div>
+</div>
+<div id="content">
+<div class="sect2">
+<h3 id="_discovery_services">Discovery Services</h3>
+<div class="paragraph">
+<p>The Discovery Services allow you to use third party libraries to discover the nodes member of the Cellar cluster.</p>
+</div>
+<div class="sect3">
+<h4 id="_jclouds">jClouds</h4>
+<div class="paragraph">
+<p>Cellar relies on <a href="http://www.hazelcast.com">Hazelcast</a> in order to discover cluster nodes. This can happen either by using unicast, multicast or specifying the ip address of each node.
+See the <a href="hazelcast">Core Configuration</a> section for details.</p>
+</div>
+<div class="paragraph">
+<p>Unfortunately multicast is not allowed in most IaaS providers and the alternative of specifying all IP addresses creates maintenance difficulties, especially since in most cases the addresses are not known in advance.</p>
+</div>
+<div class="paragraph">
+<p>Cellar solves this problem using a cloud discovery service powered by <a href="http://jclouds.apache.org">jClouds</a>.</p>
+</div>
+<div class="sect4">
+<h5 id="_cloud_discovery_service">Cloud discovery service</h5>
+<div class="paragraph">
+<p>Most cloud providers provide cloud storage among other services. Cellar uses the cloud storage via jclouds, in order to determine the IP addresses of each node so that Hazelcast can find them.</p>
+</div>
+<div class="paragraph">
+<p>This approach is also called blackboard and refers to the process where each node registers itself in a common storage are so that other nodes know its existence.</p>
+</div>
+</div>
+<div class="sect4">
+<h5 id="_installing_cellar_cloud_discovery_service">Installing Cellar cloud discovery service</h5>
+<div class="paragraph">
+<p>To install the cloud discovery service simply install the appropriate jclouds provider and then install cellar-cloud feature.
+Amazon S3 is being used here for this example, but the below applies to any provider supported by jclouds.</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>karaf@root()> feature:install jclouds-aws-s3
+karaf@root()> feature:install cellar-cloud</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>Once the feature is installed, you’re required to create a configuration that contains credentials and the type of the cloud storage (aka blobstore).
+To do that add a configuration file under the etc folder with the name <code>org.apache.karaf.cellar.cloud-<provider>.cfg</code> and place the following information there:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>provider=aws-s3 (this varies according to the blobstore provider)
+identity=<the identity of the blobstore account>
+credential=<the credential/password of the blobstore account)
+container=<the name of the bucket>
+validity=<the amount of time an entry is considered valid, after that time the entry is removed></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>For instance, you can create <code>etc/org.apache.karaf.cellar.cloud-mycloud.cfg</code> containing:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>provider=aws-s3
+identity=username
+credential=password
+container=cellar
+validity=360000</pre>
+</div>
+</div>
+<div class="admonitionblock note">
+<table>
+<tr>
+<td class="icon">
+<div class="title">Note</div>
+</td>
+<td class="content">
+<div class="paragraph">
+<p>You can find the cloud providers supported by jClouds here <a href="http://repo1.maven.org/maven2/org/apache/jclouds/provider/" class="bare">http://repo1.maven.org/maven2/org/apache/jclouds/provider/</a>.
+You have to install the corresponding jClouds feature for the provider.</p>
+</div>
+</td>
+</tr>
+</table>
+</div>
+<div class="paragraph">
+<p>After creating the file the service will check for new nodes. If new nodes are found the Hazelcast instance configuration will be updated and the instance restarted.</p>
+</div>
+</div>
+</div>
+<div class="sect3">
+<h4 id="_kubernetes_docker_io">Kubernetes & docker.io</h4>
+<div class="paragraph">
+<p><a href="http://kubernetes.io">Kubernetes</a> is an open source orchestration system for docker.io containers.
+It handles scheduling onto nodes in a compute cluster and actively manages workloads to ensure that their state matches
+the users declared intentions.</p>
+</div>
+<div class="paragraph">
+<p>Using the concepts of "labels", "pods", "replicationControllers" and "services", it groups the containers which make up
+an application into logical units for easy management and discovery.</p>
+</div>
+<div class="paragraph">
+<p>Following the aforementioned concept will most likely change how you package and provision your Karaf based applications.
+For instance, you will eventually have to provide a Docker image with a pre-configured Karaf, KAR files in deployment
+folder, etc. so that your Kubernetes container may bootstrap everything on boot.</p>
+</div>
+<div class="paragraph">
+<p>The Cellar Kubernetes discovery service is a great complement to the Karaf docker.io feature (allowing you to easily
+create and manage docker.io images in and for Karaf).</p>
+</div>
+<div class="sect4">
+<h5 id="_kubernetes_discovery_service">Kubernetes discovery service</h5>
+<div class="paragraph">
+<p>In order to determine the IP address of each node, so that Hazelcast can connect to them, the Kubernetes discovery service queries
+the Kubernetes API for containers labeled with the <code>pod.label.key</code> and <code>pod.label.key</code> specified in <code>etc/org.apache.karaf.cellar.kubernetes-name.cfg</code>.</p>
+</div>
+<div class="paragraph">
+<p>The name in <code>etc/org.apache.karaf.cellar.kubernetes-name.cfg</code> is a name of the choice. It allows you to create multiple Kubernetes discovery services.
+Thanks to that, the Cellar nodes can be discovered on different Kubernetes.</p>
+</div>
+<div class="paragraph">
+<p>So, you <strong>must be sure</strong> to label your containers (pods) accordingly.</p>
+</div>
+<div class="paragraph">
+<p>After a Cellar node starts up, Kubernetes discovery service will configure Hazelcast with currently running Cellar nodes.
+Since Hazelcast follows a peer-to-peer all-shared topology, whenever nodes come up and down, the cluster will remain up-to-date.</p>
+</div>
+</div>
+<div class="sect4">
+<h5 id="_installing_kubernetes_discovery_service">Installing Kubernetes discovery service</h5>
+<div class="paragraph">
+<p>To install the Kubernetes discovery service, simply install cellar-kubernetes feature.</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>karaf@root()> feature:install cellar-kubernetes</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>Once the cellar-kubernetes feature is installed, you have to create the Kubernetes provider configuration file.
+If you have multiple Kubernetes instances, you create one configuration file per instance.</p>
+</div>
+<div class="paragraph">
+<p>For instance, you can create <code>etc/org.apache.karaf.cellar.kubernetes-myfirstcluster.cfg</code> containing:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>host=localhost
+port=8080
+pod.label.key=name
+pod.label.value=cellar</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>and another one <code>etc/org.apache.karaf.cellar.kubernetes-mysecondcluster.cfg</code> containing:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>host=192.168.134.2
+port=8080
+pod.label.key=name
+pod.label.value=cellar</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>In case you change the file, the discovery service will check again for new nodes. If new nodes are found, Hazelcast configuration will be
+updated and the instance restarted.</p>
+</div>
+</div>
+</div>
+</div>
+</div>
+<div id="footer">
+<div id="footer-text">
+Last updated 2016-03-04 11:02:10 CET
+</div>
+</div>
+</body>
+</html>
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