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shows you how to setup request timeouts in Envoy using Istio."}); docs.push({path: [ "zipkin-tracing.md", ], url: "/docs/tasks/zipkin-tracing.html", title: "Distributed Request Tracing", order: 120, overview: "How to configure the proxies to send tracing requests to Zipkin"}); genNavBarTree(docs) </script></ul></div><div id="tab-container" class="col-xs-1 tab-neg-margin pull-left"> <a id="sidebar-tab" class="glyphicon glyphicon-chevron-left" href="javascript:void 0;"></a></div><div id="content-container" class="thin-left-border col-sm-9 markdown"><div id="toc" class="toc"></div><div id="doc-content"><h1>Fault Injection</h1><p>This task shows how to inject delays and test the resiliency of your application.</p><h2 id="before-you-begin">Before you begin</h2><ul><li><p>Setup Istio by following the instructions in the <a href="./installing-istio.html">Installation guide</a>.</p></li><li><p>Deploy the <a href="/v0.1/docs/samples/bookinfo.html">BookInfo</a> sample application.</p></li><li><p>Initialize the application version routing by either first doing the <a href="./request-routing.html">request routing</a> task or by running following commands:</p><blockquote><p>Note: This assumes you don’t have any routes set yet. If you’ve already created conflicting route rules for the sample, you’ll need to use <code>replace</code> rather than <code>create</code> in one or both of the following commands.</p></blockquote><pre><code class="language-bash">istioctl create -f samples/apps/bookinfo/route-rule-all-v1.yaml
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istioctl create -f samples/apps/bookinfo/route-rule-reviews-test-v2.yaml
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</code></pre></li></ul><h2 id="fault-injection">Fault injection</h2><p>To test our BookInfo application microservices for resiliency, we will <em>inject a 7s delay</em> between the reviews:v2 and ratings microservices. Since the <em>reviews:v2</em> service has a 10s timeout for its calls to the ratings service, we expect the end-to-end flow to continue without any errors.</p><ol><li><p>Create a fault injection rule to delay traffic coming from user “jason” (our test user)</p><pre><code class="language-bash">istioctl create -f samples/apps/bookinfo/destination-ratings-test-delay.yaml
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</code></pre><p>Confirm the rule is created:</p><pre><code class="language-bash">istioctl get route-rule ratings-test-delay
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</code></pre><pre><code class="language-yaml">destination: ratings.default.svc.cluster.local
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httpFault:
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delay:
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fixedDelay: 7s
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percent: 100
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match:
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httpHeaders:
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cookie:
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regex: "^(.*?;)?(user=jason)(;.*)?$"
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precedence: 2
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route:
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- tags:
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version: v1
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</code></pre><p>Allow several seconds to account for rule propagation delay to all pods.</p></li><li><p>Observe application behavior</p><p>If the application’s front page was set to correctly handle delays, we expect it to load within approximately 7 seconds. To see the web page response times, open the <em>Developer Tools</em> menu in IE, Chrome or Firefox (typically, key combination <em>Ctrl+Shift+I</em> or <em>Alt+Cmd+I</em>) and reload the <code>productpage</code> web page.</p><p>You will see that the webpage loads in about 6 seconds. The reviews section will show <em>Sorry, product reviews are currently unavailable for this book</em>.</p></li></ol><h2 id="understanding-what-happened">Understanding what happened</h2><p>The reason that the entire reviews service has failed is because our BookInfo application has a bug. The timeout between the productpage and reviews service is less (3s + 1 retry = 6s total) than the timeout between the reviews and ratings service (10s). These kinds of bugs can occur in typical enterprise applications where different teams develop different microservices independently. Istio’s fault injection rules help you identify such anomalies without impacting end users.</p><blockquote><p>Notice that we are restricting the failure impact to user “jason” only. If you login as any other user, you would not experience any delays.</p></blockquote><p><strong>Fixing the bug:</strong> At this point we would normally fix the problem by either increasing the productpage timeout or decreasing the reviews to ratings service timeout, terminate and restart the fixed microservice, and then confirm that the <code>productpage</code> returns its response without any errors.</p><p>However, we already have this fix running in v3 of the reviews service, so we can simply fix the problem by migrating all traffic to <code>reviews:v3</code> as described in the <a href="./request-routing.html">request routing task</a>.</p><p>(Left as an exercise for the reader - change the delay rule to use a 2.8 second delay and then run it against the v3 version of reviews.)</p><h2 id="whats-next">What’s next</h2><ul><li><p>Learn more about <a href="/v0.1/docs/concepts/traffic-management/fault-injection.html">fault injection</a>.</p></li><li><p>Limit requests to the BookInfo <code>ratings</code> service with Istio <a href="./rate-limiting.html">rate limiting</a>.</p></li><li><p>If you are not planning to explore any follow-on tasks, refer to the <a href="/v0.1/docs/samples/bookinfo.html#cleanup">BookInfo cleanup</a> instructions to shutdown the application and cleanup the associated rules.</p></li></ul></div></div></div></div></div></div><script src="/v0.1/js/sidemenu.js"></script><footer><div class="container"><div class="row"><div class="col-md-2"></div><div class="col-md-3 col-sm-4 col-xs-12 center-block"><ul class="toggle"><p class="header">Docs</p><li><a href="/v0.1/docs/">Welcome</a></li><li><a href="/v0.1/docs/concepts">Concepts</a></li><li><a href="/v0.1/docs/tasks">Tasks</a></li><li><a href="/v0.1/docs/samples">Samples</a></li><li><a href="/v0.1/docs/reference">Reference</a></li></ul></div><hr class="footer-sections" /><div class="col-md-3 col-sm-4 col-xs-12 center-block"><ul class="toggle"><p class="header">Resources</p><li><a href="/v0.1/faq">Frequently Asked Questions</a></li><li><a href="/v0.1/troubleshooting">Troubleshooting Guide</a></li><li><a href="/v0.1/bugs">Report a Bug</a></li><li><a href="https://github.com/istio/istio.github.io/issues/new?title=Issue with _docs/tasks/fault-injection.md">Report a Doc Issue</a></li><li><a href="https://github.com/istio/istio.github.io/edit/master/_docs/tasks/fault-injection.md">Edit This Page on GitHub</a></li></ul></div><hr class="footer-sections" /><div class="col-md-3 col-sm-4 col-xs-12 center-block"><ul class="toggle"><p class="header">Community</p><li><a href="https://groups.google.com/forum/#!forum/istio-users" target="_blank"><span class="group">User</span></a> | <a href="https://groups.google.com/forum/#!forum/istio-dev" target="_blank">Dev Mailing Lists</a></li><li><a href="https://twitter.com/IstioMesh" target="_blank"><span class="twitter">Twitter</span></a></li><li><a href="https://github.com/istio/istio" target="_blank"><span class="github">GitHub</span></a></li></ul></div><div class="col-md-1"></div></div><div class="row"><p class="description small text-center"> Copyright © 2017 Istio Authors<br> Istio 0.1<br> Archived on 20-Jul-2017</p></div></div></footer><script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.15.0/jquery.validate.min.js"></script> <script src="/v0.1/js/jquery.form.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/js/bootstrap.min.js"></script> <script src="/v0.1/js/slick.min.js"></script> <script src="/v0.1/js/jquery.visible.min.js"></script> <script src="/v0.1/js/common.js" type="text/javascript" charset="utf-8"></script> <script src="/v0.1/js/buttons.js"></script> <script src="/v0.1/js/search.js"></script> <script src="/v0.1/js/prism.js"></script></body></html>
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