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lab_05.html
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<title>Lab 5 - Scaling Applications</title>
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</head>
<body class="article">
<div id="header">
<h1>Lab 5 - Scaling Applications</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="quoteblock abstract">
<blockquote>
<div class="paragraph">
<p>Cloud Foundry makes the work of horizontally scaling application instances and updating load balancer routing tables easy.</p>
</div>
<div class="paragraph">
<p>In this lab, we’ll use the Guestbook app to illustrate Cloud Foundry operations such as scaling.</p>
</div>
</blockquote>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_scale_the_application_up">Scale the Application Up</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Visit the application in your browser by hitting the route that was generated by the CLI in the previous exercise:</p>
<div class="imageblock">
<div class="content">
<img src="Common/images/Guestbook_unscaled_new.png" alt="Guestbook scale initial">
</div>
</div>
<div class="paragraph">
<p>You’ll see that the application is reporting various bits of information that it has discovered from its environment.
Of primary interest is that this application reports its <em>instance index</em>.</p>
</div>
</li>
<li>
<p>Now let’s increase the number of running application instances to 5:</p>
<div class="listingblock">
<div class="content">
<pre>$ cf scale -i 5 guestbook
Scaling app guestbook in org Northeast / Canada / space cjd as [email protected]...
OK</pre>
</div>
</div>
<div class="paragraph">
<p>In reporting <code>OK</code>, the CLI is letting you know that the additional requested instances have been started, but they are not yet necessarily running.</p>
</div>
</li>
<li>
<p>We can determine how many instances are actually running like this:</p>
<div class="exampleblock">
<div class="content">
<div class="listingblock">
<div class="content">
<pre>$ cf app guestbook
Showing health and status for app guestbook in org Northeast / Canada / space cjd as [email protected]...
OK
requested state: started
instances: 2/5
usage: 512M x 5 instances
urls: guestbook-maggoty-nonpeltast.cfapps.io, guestbook-seismoscopic-incensement.cfapps.io
last uploaded: Tue Oct 13 13:05:20 UTC 2015
stack: cflinuxfs2
buildpack: java-buildpack=v3.2-https://github.com/cloudfoundry/java-buildpack.git#3b68024 java-main open-jdk-like-jre=1.8.0_60 open-jdk-like-memory-calculator=2.0.0_RELEASE postgresql-jdbc=9.4.1204 spring-auto-reconfiguration=1.10.0_RELEASE
state since cpu memory disk details
#0 running 2015-10-13 09:06:11 AM 0.1% 443.5M of 512M 173.1M of 1G <b class="conum">(1)</b>
#1 starting 2015-10-13 09:24:17 AM 0.0% 0 of 0 0 of 0 <b class="conum">(2)</b>
#2 starting 2015-10-13 09:24:17 AM 0.0% 0 of 0 0 of 0
#3 starting 2015-10-13 09:24:17 AM 0.0% 0 of 0 0 of 0
#4 starting 2015-10-13 09:24:17 AM 0.0% 0 of 0 0 of 0</pre>
</div>
</div>
<div class="colist arabic">
<ol>
<li>
<p>This application instance has completed the startup process and is actually able to accept requests.</p>
</li>
<li>
<p>This application instance is still starting and will not have any requests routed to it.</p>
</li>
</ol>
</div>
</div>
</div>
</li>
<li>
<p>Eventually all instances will converge to a running state:</p>
<div class="listingblock">
<div class="content">
<pre>$ cf app guestbook
Showing health and status for app guestbook in org Northeast / Canada / space cjd as [email protected]...
OK
requested state: started
instances: 5/5
usage: 512M x 5 instances
urls: guestbook-maggoty-nonpeltast.cfapps.io, guestbook-seismoscopic-incensement.cfapps.io
last uploaded: Tue Oct 13 13:05:20 UTC 2015
stack: cflinuxfs2
buildpack: java-buildpack=v3.2-https://github.com/cloudfoundry/java-buildpack.git#3b68024 java-main open-jdk-like-jre=1.8.0_60 open-jdk-like-memory-calculator=2.0.0_RELEASE postgresql-jdbc=9.4.1204 spring-auto-reconfiguration=1.10.0_RELEASE
state since cpu memory disk details
#0 running 2015-10-13 09:06:11 AM 0.1% 443.5M of 512M 173.1M of 1G
#1 running 2015-10-13 09:25:17 AM 0.0% 443.2M of 512M 173.1M of 1G
#2 running 2015-10-13 09:24:38 AM 0.2% 430M of 512M 173.1M of 1G
#3 running 2015-10-13 09:24:39 AM 0.2% 430.1M of 512M 173.1M of 1G
#4 running 2015-10-13 09:24:37 AM 0.0% 0 of 0 0 of 0</pre>
</div>
</div>
</li>
<li>
<p>Revisit the application route in the browser.
Refresh several times.
You should observe the instance index changing as you do so:</p>
<div class="imageblock">
<div class="content">
<img src="Common/images/Guestbook_scaled_new.png" alt="Guestbook scaled">
</div>
</div>
<div class="paragraph">
<p>The aforementioned <a href="http://docs.cloudfoundry.org/concepts/architecture/router.html">(Go)Router</a> is applying a random routing algorithm to all of the application instances assigned to this route.
As an instance reaches the <code>running</code> state, <a href="http://docs.pivotal.io/pivotalcf/concepts/diego/diego-architecture.html">Diego</a> registers that instance in the routing table assigned to its route by sending a message to Cloud Foundry’s message bus.
All (Go)Router instances are subscribed to this channel and register the routes independently.
This makes for very dynamic and rapid reconfiguration!</p>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_scale_the_application_down">Scale the Application Down</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>We can scale the application instances back down as easily as we scaled them up, using the same command structure:</p>
<div class="listingblock">
<div class="content">
<pre>$ cf scale -i 1 guestbook
Scaling app guestbook in org Northeast / Canada / space cjd as [email protected]...
OK</pre>
</div>
</div>
</li>
<li>
<p>Check the application status again:</p>
<div class="listingblock">
<div class="content">
<pre>$ cf app guestbook
Showing health and status for app guestbook in org Northeast / Canada / space cjd as [email protected]...
OK
requested state: started
instances: 1/1
usage: 512M x 1 instances
urls: guestbook-maggoty-nonpeltast.cfapps.io, guestbook-seismoscopic-incensement.cfapps.io
last uploaded: Tue Oct 13 13:05:20 UTC 2015
stack: cflinuxfs2
buildpack: java-buildpack=v3.2-https://github.com/cloudfoundry/java-buildpack.git#3b68024 java-main open-jdk-like-jre=1.8.0_60 open-jdk-like-memory-calculator=2.0.0_RELEASE postgresql-jdbc=9.4.1204 spring-auto-reconfiguration=1.10.0_RELEASE
state since cpu memory disk details
#0 running 2015-10-13 09:06:11 AM 0.1% 443.5M of 512M 173.1M of 1G</pre>
</div>
</div>
<div class="paragraph">
<p>As you can see, we’re back down to only one instance running, and it is in fact the original index 0 that we started with.</p>
</div>
</li>
<li>
<p>Confirm that by again revisiting the route in the browser and checking the instance index:</p>
<div class="imageblock">
<div class="content">
<img src="Common/images/Guestbook_unscaled_new.png" alt="Guestbook unscaled">
</div>
</div>
</li>
</ol>
</div>
</div>
</div>
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Last updated 2015-10-14 14:26:54 EDT
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