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<title>Lab 6 - Binding to Cloud Foundry Services</title>
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</head>
<body class="article">
<div id="header">
<h1>Lab 6 - Binding to Cloud Foundry Services</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="quoteblock abstract">
<blockquote>
<div class="paragraph">
<p>The <em>Spring Music</em> application was designed to illustrate the ease with which various types of data services can be bound to and utilized by Spring applications running on Cloud Foundry.
In this lab, we’ll be binding the application to both MySql and MongoDB databases.</p>
</div>
<div class="paragraph">
<p>Cloud Foundry services are managed through two primary types of operations:</p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1">Create/Delete</dt>
<dd>
<p>These operations create or delete instances of a service.
For a database this could mean creating/deleting a schema in an existing multitenant cluster or creating/deleting a dedicated database cluster.</p>
</dd>
<dt class="hdlist1">Bind/Unbind</dt>
<dd>
<p>These operations create or delete unique credential sets for an existing service instance that can then be injected into the environment of an application instance.</p>
</dd>
</dl>
</div>
</blockquote>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_a_bit_of_review">A Bit of Review</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Your instance of <em>Spring Music</em> should still be running from the end of <a href="../lab_05/lab_05.html">Lab 5</a>.
Visit the application in your browser by hitting the route that was generated by the CLI:</p>
</div>
<div class="imageblock">
<div class="content">
<img src="../../../Common/images/Spring_Music_NS.png" alt="Spring Music NS">
</div>
</div>
<div class="paragraph">
<p>The information dialog in the top right-hand corner indicates that we’re currently running with an in-memory database, and that we’re not bound to any services.
Let’s change that.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_the_services_marketplace">The Services Marketplace</h2>
<div class="sectionbody">
<div class="paragraph">
<p>There are two ways to discover what services are available on Pivotal Web Services.
The first is available on any instance of Cloud Foundry: the CLI. Just type:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>$ cf marketplace</pre>
</div>
</div>
<div class="paragraph">
<p>and you’ll get a list of services, their available plans, and descriptions.</p>
</div>
<div class="paragraph">
<p>The second way is specific to Pivotal Cloud Foundry’s Application Manager UI.
If you haven’t already, login to it by visiting {CF-CONSOLE-URL}.</p>
</div>
<div class="paragraph">
<p>Click on the “Marketplace” link:
<em>The Screenshots below are from Pivotal Web Services (public managed Pivotal CF). If you are using Pivotal Cloud Foundry, you will see something similar.</em></p>
</div>
<div class="imageblock">
<div class="content">
<img src="../../../Common/images/PWS_AM_InstructorSpace.png" alt="PWS AM InstructorSpace">
</div>
</div>
<div class="paragraph">
<p>and you’ll see the same service/plan/description listing in the browser:</p>
</div>
<div class="imageblock">
<div class="content">
<img src="../../../Common/images/PWS_Marketplace.png" alt="PWS Marketplace">
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_creating_and_binding_to_a_service_instance">Creating and Binding to a Service Instance</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Let’s begin by creating a MySql instance provided by Pivotal.</p>
</li>
</ol>
</div>
<div class="paragraph">
<p>From the CLI, let’s <em>create</em> a p-mysql service instance:</p>
</div>
<div class="paragraph">
<p>+</p>
</div>
<div class="listingblock">
<div class="content">
<pre>$ cf create-service p-mysql 100mb-dev spring-music-db
Creating service spring-music-db in org ACME / space instructor as [email protected]...
OK</pre>
</div>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Next we’ll <em>bind</em> the newly created instance to our <code>spring-music</code> application:</p>
<div class="listingblock">
<div class="content">
<pre>$ cf bs spring-music spring-music-db
Binding service spring-music-db to app spring-music in org ACME / space instructor as [email protected]...
OK
TIP: Use 'cf restage' to ensure your env variable changes take effect</pre>
</div>
</div>
</li>
<li>
<p>Notice the admonition to <code>Use 'cf restage' to ensure your env variable changes take effect</code>.
Let’s take a look at the environment variables for our application to see what’s been done. We can do this by typing:</p>
<div class="listingblock">
<div class="content">
<pre>$ cf env spring-music</pre>
</div>
</div>
<div class="paragraph">
<p>The subset of the output we’re interested in is located near the very top, titled <code>System-Provided</code>:</p>
</div>
<div class="exampleblock">
<div class="content">
<div class="listingblock">
<div class="content">
<pre>System-Provided:
{
"VCAP_SERVICES": { <b class="conum">(1)</b>
"p-mysql": [
{
"credentials": {
"hostname": "10.68.50.61",
"jdbcUrl": "jdbc:mysql://10.68.50.61:3306/cf_ddbe0221_d1fc_478f_b693_69279b2de702?user=mWsYAON34zbaQPAA\u0026password=CZImCZ9iSNU7HfP2",
"name": "cf_ddbe0221_d1fc_478f_b693_69279b2de702",
"password": "CZImCZ9iSNU7HfP2",
"port": 3306,
"uri": "mysql://mWsYAON34zbaQPAA:[email protected]:3306/cf_ddbe0221_d1fc_478f_b693_69279b2de702?reconnect=true", <b class="conum">(2)</b>
"username": "mWsYAON34zbaQPAA"
},
"label": "p-mysql",
"name": "spring-music-db",
"plan": "100mb-dev",
"tags": [
"mysql",
"relational"
]
}
]
}
}
{
"VCAP_APPLICATION": {
"application_name": "spring-music",
"application_uris": [
"spring-music-unbragging-pourparler.pcf2.fe.gopivotal.com"
],
"application_version": "e3fa423d-69ad-41cb-bd17-0e88427dfe4c",
"limits": {
"disk": 1024,
"fds": 16384,
"mem": 512
},
"name": "spring-music",
"space_id": "080ba4e6-bafc-482b-9a98-42f612eef736",
"space_name": "jfullam",
"uris": [
"spring-music-unbragging-pourparler.pcf2.fe.gopivotal.com"
],
"users": null,
"version": "e3fa423d-69ad-41cb-bd17-0e88427dfe4c"
}
}</pre>
</div>
</div>
<div class="colist arabic">
<ol>
<li>
<p><code>VCAP_SERVICES</code> is a special Cloud Foundry environment variable that contains a JSON document containing all of the information for any services bound to an application.</p>
</li>
<li>
<p>Notice here the unique URI for this instance of MySql that <code>spring-music</code> has been bound to.</p>
</li>
</ol>
</div>
</div>
</div>
</li>
<li>
<p>Now let’s <em>restage</em> the application, which cycles our application back through the staging/buildpack process before redeploying the application.<span class="footnote">[<a id="_footnoteref_1" class="footnote" href="#_footnote_1" title="View footnote.">1</a>]</span></p>
<div class="listingblock">
<div class="content">
<pre>$ cf restage spring-music</pre>
</div>
</div>
<div class="paragraph">
<p>Once the application is running again, revisit or refresh the browser tab where you have the <em>Spring Music</em> application loaded:</p>
</div>
<div class="imageblock">
<div class="content">
<img src="../../../Common/images/Spring_Music_PGSQL.png" alt="Spring Music PGSQL">
</div>
</div>
<div class="paragraph">
<p>As you can see from the information dialog, the application is now utilizing a MySql database via the <code>spring-music-db</code> service.</p>
</div>
</li>
<li>
<p><strong>(OPTIONAL STEPS)</strong> If you have a MySql GUI tool handy and you are using a lab environment that has the necessary network access (ask your instructor), you can inspect the music database created. Otherwise, your instructor will demo via a Pivotal VPN connection.</p>
</li>
<li>
<p>In your DB tool, create a new server connection and populate the properties with values from the URI in your <code>VCAP_SERVICES</code> environment variable (remember <code>cf env spring-muisc</code>!):</p>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_swapping_from_mysql_to_mongodb">Swapping from MySql to MongoDB</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Now let’s bind our <em>Spring Music</em> application to MongoDB instead of MySql. First let’s create <span class="footnote">[<a id="_footnoteref_2" class="footnote" href="#_footnote_2" title="View footnote.">2</a>]</span> a MongoDB instance from the Pivotal Cloud Foundry marketplace:</p>
<div class="listingblock">
<div class="content">
<pre>$ cf cs p-mongodb development spring-music-mongo
Creating service spring-music-mongo in org ACME / space instructor as [email protected]...
OK</pre>
</div>
</div>
</li>
<li>
<p>Next we’ll unbind our application from our MySql instance (<em>Spring Music</em> does not support being bound to multiple datasources at the same time):</p>
<div class="listingblock">
<div class="content">
<pre>$ cf us spring-music spring-music-db</pre>
</div>
</div>
<div class="paragraph">
<p>If you visit your application now, you’ll see that it still works.
If you recall, environment variable changes (such as binding/unbinding of services) don’t actually take effect until a <em>restage</em> or <em>restart</em>.</p>
</div>
</li>
<li>
<p>Now let’s bind the application to our MongoDB instance:</p>
<div class="listingblock">
<div class="content">
<pre>$ cf bs spring-music spring-music-mongo
Binding service spring-music-mongo to app spring-music in org oreilly-class / space instructor as [email protected]...
OK
TIP: Use 'cf restage' to ensure your env variable changes take effect</pre>
</div>
</div>
</li>
<li>
<p>And then do a restage:</p>
<div class="listingblock">
<div class="content">
<pre>$ cf restage spring-music</pre>
</div>
</div>
<div class="paragraph">
<p>Once the application is running again, revisit or refresh the browser tab where you have the <em>Spring Music</em> application loaded:</p>
</div>
<div class="imageblock">
<div class="content">
<img src="../../../Common/images/Spring_Music_Mongo.png" alt="Spring Music Mongo">
</div>
</div>
<div class="paragraph">
<p>As you can see from the information dialog, the application is now utilizing a MongoDB database via the <code>spring-music-mongo</code> service.</p>
</div>
</li>
<li>
<p><strong>(OPTIONAL)</strong> Similar to the steps to view the relational data in another DB tool, a MongoDB client tool can be used to inspect the MongoDB instance. Your instructor can demo this if you do not have access to the tool and / or the appropriate network access to the MongoDB instance.</p>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_clean_up">Clean Up</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Because of the limited PWS quota we have for this course, let’s clean up our application and services to make room for future labs.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Delete the <code>spring-music</code> application:</p>
<div class="listingblock">
<div class="content">
<pre>$ cf d spring-music
Really delete the app spring-music?> y
Deleting app spring-music in org oreilly-class / space instructor as [email protected]...
OK</pre>
</div>
</div>
</li>
<li>
<p>Delete the <code>spring-music-mongo</code> service:</p>
<div class="listingblock">
<div class="content">
<pre>$ cf ds spring-music-mongo
Really delete the service spring-music-mongo?> y
Deleting service spring-music-mongo in org oreilly-class / space instructor as [email protected]...
OK</pre>
</div>
</div>
</li>
<li>
<p>Delete the <code>spring-music-db</code> service:</p>
<div class="listingblock">
<div class="content">
<pre>$ cf ds spring-music-db
Really delete the service spring-music-db?> y
Deleting service spring-music-db in org oreilly-class / space instructor as [email protected]...
OK</pre>
</div>
</div>
</li>
</ol>
</div>
</div>
</div>
</div>
<div id="footnotes">
<hr>
<div class="footnote" id="_footnote_1">
<a href="#_footnoteref_1">1</a>. In this case, we could accomplish the same goal by only <em>restarting</em> the application via <code>cf restart spring-music</code>. A <em>restage</em> is generally recommended because Cloud Foundry buildpacks also have access to injected environment variables and can install or configure things differently based on their values.
</div>
<div class="footnote" id="_footnote_2">
<a href="#_footnoteref_2">2</a>. Notice in this listing that we’re typing <code>cf cs</code> rather than <code>cf create-service</code>. Most CF CLI commands have a shorthand version to save typing time. You can view these shorthand commands via <code>cf help</code> or <code>cf h</code> (See! More shorthand!).
</div>
</div>
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<div id="footer-text">
Last updated 2015-06-14 09:40:36 EDT
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