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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">></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/incubator-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">></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'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 hre
f="/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
+<!DOCTYPE html><html><head><title>Deploying an Engine</title><meta
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content="width=device-width, initial-scale=1.0"/><meta class="swiftype"
name="title" data-type="string" content="Deploying an Engine"/><link
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true });}catch(e){}</script></head><body><div id="global"><header><div
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href="#"></a><a href="http://predictionio.apache.org/";><img alt="Apache
PredictionIO" id="logo"
src="/images/logos/logo-ee2b9bb3.png"/></a><span>®</span></div><div
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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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hidden-lg"></div></div></div></div><div id="page" class="container-fluid"><div
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
Engine</span></a></li></ul></li><li class="level-1"><a class="expandible"
href="#"><span>Integrating with Your App</span></a><ul><li class="level-2"><a
class="final" href="/appin
tegration/"><span>App Integration Overview</span></a></li><li
class="level-2"><a class="expandible" href="/sdk/"><span>List of
SDKs</span></a><ul><li class="level-3"><a class="final"
href="/sdk/java/"><span>Java & Android SDK</span></a></li><li
class="level-3"><a class="final" href="/sdk/php/"><span>PHP
SDK</span></a></li><li class="level-3"><a class="final"
href="/sdk/python/"><span>Python SDK</span></a></li><li class="level-3"><a
class="final" href="/sdk/ruby/"><span>Ruby SDK</span></a></li><li
class="level-3"><a class="final" href="/sdk/community/"><span>Community Powered
SDKs</span></a></li></ul></li></ul></li><li class="level-1"><a
class="expandible" href="#"><span>Deploying an Engine</span></a><ul><li
class="level-2"><a class="final active" href="/deploy/"><span>Deploying as a
Web Service</span></a></li><li class="level-2"><a class="final"
href="/batchpredict/"><span>Batch Predictions</span></a></li><li
class="level-2"><a class="final" href="/deploy/monitoring/"><span>Monitori
ng Engine</span></a></li><li class="level-2"><a class="final"
href="/deploy/engineparams/"><span>Setting Engine Parameters</span></a></li><li
class="level-2"><a class="final" href="/deploy/enginevariants/"><span>Deploying
Multiple Engine Variants</span></a></li><li class="level-2"><a class="final"
href="/deploy/plugin/"><span>Engine Server Plugin</span></a></li></ul></li><li
class="level-1"><a class="expandible" href="#"><span>Customizing an
Engine</span></a><ul><li class="level-2"><a class="final"
href="/customize/"><span>Learning DASE</span></a></li><li class="level-2"><a
class="final" href="/customize/dase/"><span>Implement DASE</span></a></li><li
class="level-2"><a class="final"
href="/customize/troubleshooting/"><span>Troubleshooting Engine
Development</span></a></li><li class="level-2"><a class="final"
href="/api/current/#package"><span>Engine Scala
APIs</span></a></li></ul></li><li class="level-1"><a class="expandible"
href="#"><span>Collecting and Analyzing Data</span></a><u
l><li class="level-2"><a class="final" href="/datacollection/"><span>Event
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 Algorithm(
s)</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>ML 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</spa
n></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/
recommendation/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
Evaluator</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="
final" 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 clas
s="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
class="expandible" href="#"><span>Engine Template Gallery</span></a><ul><li
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"
href="#"><span>Demo Tutorials</span>
</a><ul><li class="level-2"><a class="final"
href="/demo/tapster/"><span>Comics Recommendation Demo</span></a></li><li
class="level-2"><a class="final" href="/demo/community/"><span>Community
Contributed Demo</span></a></li><li class="level-2"><a class="final"
href="/demo/textclassification/"><span>Text Classification Engine
Tutorial</span></a></li></ul></li><li class="level-1"><a class="expandible"
href="/community/"><span>Getting Involved</span></a><ul><li class="level-2"><a
class="final" href="/community/contribute-code/"><span>Contribute
Code</span></a></li><li class="level-2"><a class="final"
href="/community/contribute-documentation/"><span>Contribute
Documentation</span></a></li><li class="level-2"><a class="final"
href="/community/contribute-sdk/"><span>Contribute a SDK</span></a></li><li
class="level-2"><a class="final"
href="/community/contribute-webhook/"><span>Contribute a
Webhook</span></a></li><li class="level-2"><a class="final"
href="/community/projects/"><span>Commu
nity Projects</span></a></li></ul></li><li class="level-1"><a
class="expandible" href="#"><span>Getting Help</span></a><ul><li
class="level-2"><a class="final"
href="/resources/faq/"><span>FAQs</span></a></li><li class="level-2"><a
class="final" href="/support/"><span>Support</span></a></li></ul></li><li
class="level-1"><a class="expandible"
href="#"><span>Resources</span></a><ul><li class="level-2"><a class="final"
href="/cli/"><span>Command-line Interface</span></a></li><li class="level-2"><a
class="final" href="/resources/release/"><span>Release
Cadence</span></a></li><li class="level-2"><a class="final"
href="/resources/intellij/"><span>Developing Engines with IntelliJ
IDEA</span></a></li><li class="level-2"><a class="final"
href="/resources/upgrade/"><span>Upgrade Instructions</span></a></li><li
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
class="level-2"><a class="final"
href="https://www.apache.org/licenses/";><span>License</span></a></li><li
class="level-2"><a class="final"
href="https://www.apache.org/foundation/sponsorship.html";><span>Sponsorship</span></a></li><li
class="level-2"><a class="final"
href="https://www.apache.org/foundation/thanks.html";><span>Thanks</span></a></li><li
class="level-2"><a class="final"
href="https://www.apache.org/security/";><span>Security</span></a></li></ul></li></ul></nav></div><div
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">></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 pa
ge</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">></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 bu
ild</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'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-comm
ands">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
</pre></td></tr></tbody></table> </div> <p>where <em>$PIO_HOME</em> is the
installation path of PredictionIO. See <a
href="#retrain-and-deploy-script">Retrain and Deploy Script</a> below for a
script ready for customization.</p><h2 id='specify-a-different-engine-port'
class='header-anchors'>Specify a Different Engine Port</h2><p>By default,
<code>pio deploy</code> deploys an engine on <strong>port
8000</strong>.</p><p>You can specify another port with an <em>--port</em>
argument. For example, to deploy on port 8123</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>pio deploy --port 8123
</pre></td></tr></tbody></table> </div> <p>You can also specify the binding IP
with <em>--ip</em>, which is set to <em>localhost</em> if not specified. For
example:</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>pio deploy --port 8123 --ip
1.2.3.4
-</pre></td></tr></tbody></table> </div> <h2 id='retrain-and-deploy-script'
class='header-anchors'>Retrain and Deploy Script</h2><p>A retrain and deploy
script is available <a
href="https://github.com/apache/incubator-predictionio/tree/develop/examples/redeploy-script";>in
the <em>examples/redeploy-script</em> directory</a>.</p><p>To use the script,
copy <em>local.sh.template</em> as <em>local.sh</em>, <em>redeploy.sh</em> as
(say) <em>MyEngine_Redeploy_(production).sh</em> (Name of the script will
appear as title of email) and put both files under the <em>scripts/</em>
directory of your engine. Then, modify the settings inside both file, filling
in details like <code>PIO_HOME</code>, <code>LOG_DIR</code>,
<code>TARGET_EMAIL</code>, <code>ENGINE_JSON</code> and others. You need to do
<code>pio build</code> once before using this script. This script only trains
and deploys. If <code>pio train</code> or <code>pio deploy</code> fails for
some reason, the running engine stays put in most
cases. If engine is retrained and deployed successfully, the email sent will
have <em>Normal</em> in the title so you can set filtering
rules.</p><p><code>mailutils</code> is used in this script. For Ubuntu, you can
do <code>sudo update-alternatives --config mailx</code> and see if
<code>/usr/bin/mail.mailutils</code> is selected. If you are using a server
that blocks email, you will need to use services like SendGrid.</p><p>This
script does not guarantee no down time since at some point during <code>pio
deploy</code> the original engine is shut down. The down time is usually not
more than a few seconds though it can be more.</p><p>The last thing to do is to
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>
/path/to/script >/dev/null 2>/
dev/null <span class="c"># mute both stdout and stderr to supress email sent
from cron</span>
-</pre></td></tr></tbody></table> </div> </div></div></div></div><footer><div
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+</pre></td></tr></tbody></table> </div> <h2 id='retrain-and-deploy-script'
class='header-anchors'>Retrain and Deploy Script</h2><p>A retrain and deploy
script is available <a
href="https://github.com/apache/predictionio/tree/develop/examples/redeploy-script";>in
the <em>examples/redeploy-script</em> directory</a>.</p><p>To use the script,
copy <em>local.sh.template</em> as <em>local.sh</em>, <em>redeploy.sh</em> as
(say) <em>MyEngine_Redeploy_(production).sh</em> (Name of the script will
appear as title of email) and put both files under the <em>scripts/</em>
directory of your engine. Then, modify the settings inside both file, filling
in details like <code>PIO_HOME</code>, <code>LOG_DIR</code>,
<code>TARGET_EMAIL</code>, <code>ENGINE_JSON</code> and others. You need to do
<code>pio build</code> once before using this script. This script only trains
and deploys. If <code>pio train</code> or <code>pio deploy</code> fails for
some reason, the running engine stays put in most cases. If
engine is retrained and deployed successfully, the email sent will have
<em>Normal</em> in the title so you can set filtering
rules.</p><p><code>mailutils</code> is used in this script. For Ubuntu, you can
do <code>sudo update-alternatives --config mailx</code> and see if
<code>/usr/bin/mail.mailutils</code> is selected. If you are using a server
that blocks email, you will need to use services like SendGrid.</p><p>This
script does not guarantee no down time since at some point during <code>pio
deploy</code> the original engine is shut down. The down time is usually not
more than a few seconds though it can be more.</p><p>The last thing to do is to
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>
/path/to/script >/dev/null 2>/dev/null <
span class="c"># mute both stdout and stderr to supress email sent from
cron</span>
+</pre></td></tr></tbody></table> </div> </div></div></div></div><footer><div
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