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for Users</span></a></li><li class="level-3"><a class="final" 
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Users</span></a></li></ul></li><li class="level-2"><a class="expandible" 
href="#"><span>Classification</span></a><ul><li class="level-3"><a class="
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 class="col-md-9 col-sm-12"><div class="content-header hidden-md 
hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a 
href="#">Deploying an Engine</a><span class="spacer">&gt;</span></li><li><span 
class="last">Deploying as a Web Service</span></li></ul></div><div 
id="page-title"><h1>Deploying an Engine</h1></div></div><div 
id="table-of-content-wrapper"><h5>On this page<
 /h5><aside id="table-of-contents"><ul> <li> <a 
href="#deploying-an-engine-the-first-time">Deploying an Engine the First 
Time</a> </li> <li> <a href="#update-model-with-new-data">Update Model with New 
Data</a> </li> <li> <a href="#specify-a-different-engine-port">Specify a 
Different Engine Port</a> </li> <li> <a 
href="#retrain-and-deploy-script">Retrain and Deploy Script</a> </li> </ul> 
</aside><hr/><a id="edit-page-link" 
href="https://github.com/apache/predictionio/tree/livedoc/docs/manual/source/deploy/index.html.md";><img
 src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div 
class="content-header hidden-sm hidden-xs"><div id="breadcrumbs" 
class="hidden-sm hidden xs"><ul><li><a href="#">Deploying an Engine</a><span 
class="spacer">&gt;</span></li><li><span class="last">Deploying as a Web 
Service</span></li></ul></div><div id="page-title"><h1>Deploying an 
Engine</h1></div></div><div class="content"> <p>An engine must be 
<strong>built</strong> (i.e. <code>pio build
 </code>) and <strong>trained</strong> (i.e. <code>pio train</code>) before it 
can be deployed as a web service.</p><div class="alert-message warning"><p>The 
engine server is not protected by authentication, and the instructions below 
assume deployment in a trusted environment.</p></div><h2 
id='deploying-an-engine-the-first-time' class='header-anchors'>Deploying an 
Engine the First Time</h2><p>After you have <a 
href="/start/download/">downloaded an Engine Template</a>, you can deploy it 
with these steps:</p> <ol> <li>Run <code>pio app new 
**your-app-name-here**</code> and specify the <code>appName</code> used in the 
template&#39;s <em>engine.json</em> file (you can set it there to your 
preference).</li> <li>Run <code>pio build</code> to update the engine</li> 
<li>Run <code>pio train</code> to train a predictive model with training 
data</li> <li>Run <code>pio deploy</code> to deploy the engine as a 
service</li> </ol> <div class="alert-message info"><p>See <a 
href="/cli/#engine-command
 s">here</a> to know details of command-line interface for the engine 
server.</p></div><p>A deployed engine listens to port 8000 by default. Your 
application can <a href="/appintegration/">send query to retrieve 
prediction</a> in real-time through the REST 
interface.</p><p><strong>Note</strong>: a new engine deployed as above will 
have no data to start with. Your engine may come with a <code>data/</code> 
directory with some sample data that you can import, not all have this. Check 
the quickstart instructions for your template.</p><h2 
id='update-model-with-new-data' class='header-anchors'>Update Model with New 
Data</h2><p>You probably want to update the trained predictive model with newly 
collected data regularly. To do so, run the <code>pio train</code> and 
<code>pio deploy</code> commands again:</p><div class="highlight shell"><table 
style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: 
right"><pre class="lineno">1
+<!DOCTYPE html><html><head><title>Deploying an Engine</title><meta 
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col-xs-11"><div class="hidden-md hidden-lg
 " id="mobile-page-heading-wrapper"><p>PredictionIO Docs</p><h4>Deploying as a 
Web Service</h4></div><h4 class="hidden-sm hidden-xs">PredictionIO 
Docs</h4></div><div class="col-md-3 col-sm-1 col-xs-1 hidden-md hidden-lg"><img 
id="left-menu-indicator" 
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class="row"><div id="left-menu-wrapper" class="col-md-3"><nav i
 d="nav-main"><ul><li class="level-1"><a class="expandible" 
href="/"><span>Apache PredictionIO® Documentation</span></a><ul><li 
class="level-2"><a class="final" href="/"><span>Welcome to Apache 
PredictionIO®</span></a></li></ul></li><li class="level-1"><a 
class="expandible" href="#"><span>Getting Started</span></a><ul><li 
class="level-2"><a class="final" href="/start/"><span>A Quick 
Intro</span></a></li><li class="level-2"><a class="final" 
href="/install/"><span>Installing Apache PredictionIO</span></a></li><li 
class="level-2"><a class="final" href="/start/download/"><span>Downloading an 
Engine Template</span></a></li><li class="level-2"><a class="final" 
href="/start/deploy/"><span>Deploying Your First Engine</span></a></li><li 
class="level-2"><a class="final" href="/start/customize/"><span>Customizing the 
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href="/customize/troubleshooting/"><span>Troubleshooting Engine 
Development</span></a></li><li class="level-2"><a class="final" 
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APIs</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Collecting and Analyzing Data</span></a><u
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Server Overview</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/eventapi/"><span>Collecting Data with 
REST/SDKs</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/eventmodel/"><span>Events Modeling</span></a></li><li 
class="level-2"><a class="final" 
href="/datacollection/webhooks/"><span>Unifying Multichannel Data with 
Webhooks</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/channel/"><span>Channel</span></a></li><li 
class="level-2"><a class="final" 
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href="/datacollection/analytics/"><span>Using Analytics 
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Plugin</span></a></li></ul></li><li class="level-1"><a class="expandible" 
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Another Algorithm</span></a></li><li class="level-2"><a class="final" 
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class="final" href="/evaluation/"><span>Overview</span></a></li><li 
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Start</span></a></li><li class="level-3"><a class="final"
  href="/templates/similarproduct/dase/"><span>DASE</span></a></li><li 
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Properties</span></a></li><li class="level-3"><a class="final" 
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Event</span></a></li><li class="level-3"><a class="final" 
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for Users</span></a></li><li class="level-3"><a class="final" 
href="/templates/similarproduct/recommended-user/"><span>Recommend 
Users</span></a></li></ul></li><li class="level-2"><a class="expandible" 
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Start</span></a></li><li class="level-3"><a class="final" 
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href="/templates/classification/how-to/"><span>How-To</span></a></li><li 
class="level-3"><a class="final" 
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Properties</span></a></li></ul></li></ul></li><li class="level-1"><a 
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class="level-2"><a class="final" 
href="/gallery/template-gallery/"><span>Browse</span></a></li><li 
class="level-2"><a class="final" 
href="/community/submit-template/"><span>Submit your Engine as a 
Template</span></a></li></ul></li><li class="level-1"><a class="expandible" 
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class="level-2"><a class="final" 
href="/resources/glossary/"><span>Glossary</span></a></li></ul></li><li 
class="level-1"><a class="expandible" href="#"><span>Apache Software 
Foundation</span>
 </a><ul><li class="level-2"><a class="final" 
href="https://www.apache.org/";><span>Apache Homepage</span></a></li><li 
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 class="col-md-9 col-sm-12"><div class="content-header hidden-md 
hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a 
href="#">Deploying an Engine</a><span class="spacer">&gt;</span></li><li><span 
class="last">Deploying as a Web Service</span></li></ul></div><div 
id="page-title"><h1>Deploying an Engine</h1></div></div><div 
id="table-of-content-wrapper"><h5>On this page</h5
 ><aside id="table-of-contents"><ul> <li> <a 
 >href="#deploying-an-engine-the-first-time">Deploying an Engine the First 
 >Time</a> </li> <li> <a href="#update-model-with-new-data">Update Model with 
 >New Data</a> </li> <li> <a href="#specify-a-different-engine-port">Specify a 
 >Different Engine Port</a> </li> <li> <a 
 >href="#retrain-and-deploy-script">Retrain and Deploy Script</a> </li> </ul> 
 ></aside><hr/><a id="edit-page-link" 
 >href="https://github.com/apache/predictionio/tree/livedoc/docs/manual/source/deploy/index.html.md";><img
 > src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div 
 >class="content-header hidden-sm hidden-xs"><div id="breadcrumbs" 
 >class="hidden-sm hidden xs"><ul><li><a href="#">Deploying an Engine</a><span 
 >class="spacer">&gt;</span></li><li><span class="last">Deploying as a Web 
 >Service</span></li></ul></div><div id="page-title"><h1>Deploying an 
 >Engine</h1></div></div><div class="content"> <p>An engine must be 
 ><strong>built</strong> (i.e. <code>pio build</c
 ode>) and <strong>trained</strong> (i.e. <code>pio train</code>) before it can 
be deployed as a web service.</p><div class="alert-message warning"><p>The 
engine server is not protected by authentication, and the instructions below 
assume deployment in a trusted environment.</p></div><h2 
id='deploying-an-engine-the-first-time' class='header-anchors'>Deploying an 
Engine the First Time</h2><p>After you have <a 
href="/start/download/">downloaded an Engine Template</a>, you can deploy it 
with these steps:</p> <ol> <li>Run <code>pio app new 
**your-app-name-here**</code> and specify the <code>appName</code> used in the 
template&#39;s <em>engine.json</em> file (you can set it there to your 
preference).</li> <li>Run <code>pio build</code> to update the engine</li> 
<li>Run <code>pio train</code> to train a predictive model with training 
data</li> <li>Run <code>pio deploy</code> to deploy the engine as a 
service</li> </ol> <div class="alert-message info"><p>See <a 
href="/cli/#engine-commands">
 here</a> to know details of command-line interface for the engine 
server.</p></div><p>A deployed engine listens to port 8000 by default. Your 
application can <a href="/appintegration/">send query to retrieve 
prediction</a> in real-time through the REST 
interface.</p><p><strong>Note</strong>: a new engine deployed as above will 
have no data to start with. Your engine may come with a <code>data/</code> 
directory with some sample data that you can import, not all have this. Check 
the quickstart instructions for your template.</p><h2 
id='update-model-with-new-data' class='header-anchors'>Update Model with New 
Data</h2><p>You probably want to update the trained predictive model with newly 
collected data regularly. To do so, run the <code>pio train</code> and 
<code>pio deploy</code> commands again:</p><div class="highlight shell"><table 
style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: 
right"><pre class="lineno">1
 2</pre></td><td class="code"><pre><span class="gp">$ </span>pio train
 <span class="gp">$ </span>pio deploy
 </pre></td></tr></tbody></table> </div> <p>For example, if you want to 
re-train the model every day, you may add this to your 
<em>crontab</em>:</p><div class="highlight shell"><table style="border-spacing: 
0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre 
class="lineno">1</pre></td><td class="code"><pre>0 0 <span class="k">*</span> 
<span class="k">*</span> <span class="k">*</span>   <span 
class="nv">$PIO_HOME</span>/bin/pio train; <span 
class="nv">$PIO_HOME</span>/bin/pio deploy

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class="level-1"><a class="expandible" href="#"><span>Customizing an 
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APIs</span></a></li></ul></li><li class="level-1"><a class="expandible" 
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href="/datacollection/eventapi/"><span>Collecting Data with 
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href="/datacollection/channel/"><span>Channel</span></a></li><li 
class="level-2"><a class="final" 
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Batch</span></a></li><li class="level-2"><a class="final" 
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Tools</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/plugin/"><span>Event Server 
Plugin</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Choosing an Algori
 thm</span></a><ul><li class="level-2"><a class="final" 
href="/algorithm/"><span>Built-in Algorithm Libraries</span></a></li><li 
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href="/algorithm/multiple/"><span>Combining Multiple 
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Properties</span></a></li><li class="level-3"><a class="final" 
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href="/templates/classification/how-to/"><span>How-To</span></a></li><li 
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 class="col-md-9 col-sm-12"><div class="content-header hidden-md 
hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a 
href="#">Deploying an Engine</a><span class="spacer">&gt;</span></li><li><span 
class="last">Monitoring Engine</span></li></ul></div><div 
id="page-title"><h1>Monitoring an Engine</h1></div></div><div 
id="table-of-content-wrapper"><h5>On this page</h5>
 <aside id="table-of-contents"><ul> <li> <a href="#configure-basics">Configure 
Basics</a> </li> <li> <a href="#configure-for-predictionio">Configure for 
PredictionIO</a> </li> <li> <a href="#start-it-all-up">Start it All Up</a> 
</li> <li> <a href="#testing">Testing</a> </li> </ul> </aside><hr/><a 
id="edit-page-link" 
href="https://github.com/apache/predictionio/tree/livedoc/docs/manual/source/deploy/monitoring.html.md";><img
 src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div 
class="content-header hidden-sm hidden-xs"><div id="breadcrumbs" 
class="hidden-sm hidden xs"><ul><li><a href="#">Deploying an Engine</a><span 
class="spacer">&gt;</span></li><li><span class="last">Monitoring 
Engine</span></li></ul></div><div id="page-title"><h1>Monitoring an 
Engine</h1></div></div><div class="content"> <p>If you&#39;re using 
PredictionIO in a production setting, you&#39;ll want some way to make sure it 
is always up. <a href="https://mmonit.com/monit/";>Monit</a> is a tool whic
 h will monitor important processes and programs. This guide will show how to 
set up monit on your PredictionIO server to keep an engine always up and 
running.</p><p>You can install monit on ubuntu with</p><div class="highlight 
shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" 
style="text-align: right"><pre class="lineno">1</pre></td><td 
class="code"><pre>sudo apt-get install monit
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class="level-2"><a class="final" href="/start/"><span>A Quick 
Intro</span></a></li><li class="level-2"><a class="final" 
href="/install/"><span>Installing Apache PredictionIO</span></a></li><li 
class="level-2"><a class="final" href="/start/download/"><span>Downloading an 
Engine Template</span></a></li><li class="level-2"><a class="final" 
href="/start/deploy/"><span>Deploying Your First Engine</span></a></li><li 
class="level-2"><a class="final" href="/start/customize/"><span>Customizing the 
Engine</span></a></li></ul></li><li class="level-1"><a class="expandible" 
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SDK</span></a></li><li class="level-3"><a class="final" 
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SDKs</span></a></li></ul></li></ul></li><li class="level-1"><a 
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href="/deploy/plugin/"><span>Engine Server Plugin</span></a></li></ul></li><li 
class="level-1"><a class="expandible" href="#"><span>Customizing an 
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Server Overview</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/eventapi/"><span>Collecting Data with 
REST/SDKs</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/eventmodel/"><span>Events Modeling</span></a></li><li 
class="level-2"><a class="final" 
href="/datacollection/webhooks/"><span>Unifying Multichannel Data with 
Webhooks</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/channel/"><span>Channel</span></a></li><li 
class="level-2"><a class="final" 
href="/datacollection/batchimport/"><span>Importing Data in 
Batch</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/analytics/"><span>Using Analytics 
Tools</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/plugin/"><span>Event Server 
Plugin</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Choosing an Algori
 thm</span></a><ul><li class="level-2"><a class="final" 
href="/algorithm/"><span>Built-in Algorithm Libraries</span></a></li><li 
class="level-2"><a class="final" href="/algorithm/switch/"><span>Switching to 
Another Algorithm</span></a></li><li class="level-2"><a class="final" 
href="/algorithm/multiple/"><span>Combining Multiple 
Algorithms</span></a></li><li class="level-2"><a class="final" 
href="/algorithm/custom/"><span>Adding Your Own 
Algorithms</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Tuning and Evaluation</span></a><ul><li class="level-2"><a 
class="final" href="/evaluation/"><span>Overview</span></a></li><li 
class="level-2"><a class="final" 
href="/evaluation/paramtuning/"><span>Hyperparameter Tuning</span></a></li><li 
class="level-2"><a class="final" 
href="/evaluation/evaluationdashboard/"><span>Evaluation 
Dashboard</span></a></li><li class="level-2"><a class="final" 
href="/evaluation/metricchoose/"><span>Choosing Evaluation Metrics</span>
 </a></li><li class="level-2"><a class="final" 
href="/evaluation/metricbuild/"><span>Building Evaluation 
Metrics</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>System Architecture</span></a><ul><li class="level-2"><a 
class="final" href="/system/"><span>Architecture Overview</span></a></li><li 
class="level-2"><a class="final" href="/system/anotherdatastore/"><span>Using 
Another Data Store</span></a></li></ul></li><li class="level-1"><a 
class="expandible" href="#"><span>PredictionIO® Official 
Templates</span></a><ul><li class="level-2"><a class="final" 
href="/templates/"><span>Intro</span></a></li><li class="level-2"><a 
class="expandible" href="#"><span>Recommendation</span></a><ul><li 
class="level-3"><a class="final" 
href="/templates/recommendation/quickstart/"><span>Quick 
Start</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/dase/"><span>DASE</span></a></li><li 
class="level-3"><a class="final" href="/templates/re
 commendation/evaluation/"><span>Evaluation Explained</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/recommendation/how-to/"><span>How-To</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/recommendation/reading-custom-events/"><span>Read Custom 
Events</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/customize-data-prep/"><span>Customize Data 
Preparator</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/customize-serving/"><span>Customize 
Serving</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/training-with-implicit-preference/"><span>Train 
with Implicit Preference</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/blacklist-items/"><span>Filter Recommended 
Items by Blacklist in Query</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/batch-evaluator/"><span>Batch Persistable E
 valuator</span></a></li></ul></li><li class="level-2"><a class="expandible" 
href="#"><span>E-Commerce Recommendation</span></a><ul><li class="level-3"><a 
class="final" href="/templates/ecommercerecommendation/quickstart/"><span>Quick 
Start</span></a></li><li class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/dase/"><span>DASE</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/how-to/"><span>How-To</span></a></li><li
 class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/train-with-rate-event/"><span>Train 
with Rate Event</span></a></li><li class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/adjust-score/"><span>Adjust 
Score</span></a></li></ul></li><li class="level-2"><a class="expandible" 
href="#"><span>Similar Product</span></a><ul><li class="level-3"><a 
class="final" href="/templates/similarproduct/quickstart/"><span>Quick 
Start</span></a></li><li class="level-3"><a class="fi
 nal" href="/templates/similarproduct/dase/"><span>DASE</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/similarproduct/how-to/"><span>How-To</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/similarproduct/multi-events-multi-algos/"><span>Multiple 
Events and Multiple Algorithms</span></a></li><li class="level-3"><a 
class="final" 
href="/templates/similarproduct/return-item-properties/"><span>Returns Item 
Properties</span></a></li><li class="level-3"><a class="final" 
href="/templates/similarproduct/train-with-rate-event/"><span>Train with Rate 
Event</span></a></li><li class="level-3"><a class="final" 
href="/templates/similarproduct/rid-user-set-event/"><span>Get Rid of Events 
for Users</span></a></li><li class="level-3"><a class="final" 
href="/templates/similarproduct/recommended-user/"><span>Recommend 
Users</span></a></li></ul></li><li class="level-2"><a class="expandible" 
href="#"><span>Classification</span></a><ul><li class="level-3"><a class=
 "final" href="/templates/classification/quickstart/"><span>Quick 
Start</span></a></li><li class="level-3"><a class="final" 
href="/templates/classification/dase/"><span>DASE</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/classification/how-to/"><span>How-To</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/classification/add-algorithm/"><span>Use Alternative 
Algorithm</span></a></li><li class="level-3"><a class="final" 
href="/templates/classification/reading-custom-properties/"><span>Read Custom 
Properties</span></a></li></ul></li></ul></li><li class="level-1"><a 
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 class="col-md-9 col-sm-12"><div class="content-header hidden-md 
hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a 
href="#">Deploying an Engine</a><span class="spacer">&gt;</span></li><li><span 
class="last">Monitoring Engine</span></li></ul></div><div 
id="page-title"><h1>Monitoring an Engine</h1></div></div><div 
id="table-of-content-wrapper"><h5>On this page</h5><as
 ide id="table-of-contents"><ul> <li> <a href="#configure-basics">Configure 
Basics</a> </li> <li> <a href="#configure-for-predictionio">Configure for 
PredictionIO</a> </li> <li> <a href="#start-it-all-up">Start it All Up</a> 
</li> <li> <a href="#testing">Testing</a> </li> </ul> </aside><hr/><a 
id="edit-page-link" 
href="https://github.com/apache/predictionio/tree/livedoc/docs/manual/source/deploy/monitoring.html.md";><img
 src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div 
class="content-header hidden-sm hidden-xs"><div id="breadcrumbs" 
class="hidden-sm hidden xs"><ul><li><a href="#">Deploying an Engine</a><span 
class="spacer">&gt;</span></li><li><span class="last">Monitoring 
Engine</span></li></ul></div><div id="page-title"><h1>Monitoring an 
Engine</h1></div></div><div class="content"> <p>If you&#39;re using 
PredictionIO in a production setting, you&#39;ll want some way to make sure it 
is always up. <a href="https://mmonit.com/monit/";>Monit</a> is a tool which w
 ill monitor important processes and programs. This guide will show how to set 
up monit on your PredictionIO server to keep an engine always up and 
running.</p><p>You can install monit on ubuntu with</p><div class="highlight 
shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" 
style="text-align: right"><pre class="lineno">1</pre></td><td 
class="code"><pre>sudo apt-get install monit
 </pre></td></tr></tbody></table> </div> <h2 id='configure-basics' 
class='header-anchors'>Configure Basics</h2><p>Now we can configure monit by 
the configuration file <code>/etc/monit/monitrc</code> with your favorite 
editor. You will notice that this file contains quite a bit already, most of 
which is commented intructions/examples.</p><p>First, choose the interval on 
which you want monit to check the status of your system. Use the <code>set 
daemon</code> command for this, it should already exist in the configuration 
file.</p><div class="highlight shell"><table style="border-spacing: 
0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre 
class="lineno">1</pre></td><td class="code"><pre><span class="nb">set 
</span>daemon 60 <span class="c">#checks at 1-minute intervals</span>
 </pre></td></tr></tbody></table> </div> <p>The <code>check system</code> block 
should also already be present, under the services block.</p><div 
class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td 
class="gutter gl" style="text-align: right"><pre class="lineno">1
 2

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