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"/docs/tasks/telemetry/servicegraph.html", title: "Generating a Service Graph", order: 50, overview: "This task shows you how to generate a graph of services within an Istio mesh."}); docs.push({path: [ "telemetry", "tcp-metrics.md", ], url: "/docs/tasks/telemetry/tcp-metrics.html", title: "Collecting Metrics for TCP services", order: 25, overview: "This task shows you how to configure Istio to collect metrics for TCP services."}); docs.push({path: [ "telemetry", "using-istio-dashboard.md", ], url: "/docs/tasks/telemetry/using-istio-dashboard.html", title: "Visualizing Metrics with Grafana", order: 40, overview: "This task shows you how to setup and use the Istio Dashboard to monitor mesh traffic."}); docs.push({path: [ "traffic-management", "egress.md", ], url: "/docs/tasks/traffic-management/egress.html", title: "Control Egress Traffic", order: 40, overview: "Describes how to configure Istio to route traffic from services in the mesh to external services."}); docs.push({path: [ "traffic-management", "fault-injection.md", ], url: "/docs/tasks/traffic-management/fault-injection.html", title: "Fault Injection", order: 20, overview: "This task shows how to inject delays and test the resiliency of your application."}); docs.push({path: [ "traffic-management", "index.md", ], url: "/docs/tasks/traffic-management/", title: "Traffic Management", order: 10, overview: "Describes tasks that demonstrate traffic routing features of Istio service mesh."}); docs.push({path: [ "traffic-management", "ingress.md", ], url: "/docs/tasks/traffic-management/ingress.html", title: "Istio Ingress Controller", order: 30, overview: "Describes how to configure the Istio ingress controller on Kubernetes."}); docs.push({path: [ "traffic-management", "request-routing.md", ], url: "/docs/tasks/traffic-management/request-routing.html", title: "Configuring Request Routing", order: 10, overview: "This task shows you how to configure dynamic request routing based on weights and HTTP headers."}); docs.push({path: [ "traffic-management", "request-timeouts.md", ], url: "/docs/tasks/traffic-management/request-timeouts.html", title: "Setting Request Timeouts", order: 28, overview: "This task shows you how to setup request timeouts in Envoy using Istio."}); docs.push({path: [ "traffic-management", "traffic-shifting.md", ], url: "/docs/tasks/traffic-management/traffic-shifting.html", title: "Traffic Shifting", order: 25, overview: "This task shows you how to migrate traffic from an old to new version of a service."}); genSideBarTree(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>Traffic Shifting</h1><p>This task shows you how to gradually migrate traffic from an old to new version of a service. With Istio, we can migrate the traffic in a gradual fashion by using a sequence of rules with weights less than 100 to migrate traffic in steps, for example 10, 20, 30, … 100%. For simplicity this task will migrate the traffic from <code>reviews:v1</code> to <code>reviews:v3</code> in just two steps: 50%, 100%.</p><h2 id="before-you-begin">Before you begin</h2><ul><li><p>Setup Istio by following the instructions in the <a href="/v0.4/docs/setup/">Installation guide</a>.</p></li><li><p>Deploy the <a href="/v0.4/docs/guides/bookinfo.html">BookInfo</a> sample application.</p></li></ul><blockquote><p>Note: This task assumes you are deploying the application on Kubernetes. All of the example commands are using the Kubernetes version of the rule yaml files (e.g., <code>samples/bookinfo/kube/route-rule-all-v1.yaml</code>). If you are running this task in a different environment, change <code>kube</code> to the directory that corresponds to your runtime (e.g., <code>samples/bookinfo/consul/route-rule-all-v1.yaml</code> for the Consul-based runtime).</p></blockquote><h2 id="weight-based-version-routing">Weight-based version routing</h2><ol><li><p>Set the default version for all microservices to v1.</p><pre><code class="language-bash">istioctl create -f samples/bookinfo/kube/route-rule-all-v1.yaml
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</code></pre></li><li><p>Confirm v1 is the active version of the <code>reviews</code> service by opening http://$GATEWAY_URL/productpage in your browser.</p><p>You should see the BookInfo application productpage displayed. Notice that the <code>productpage</code> is displayed with no rating stars since <code>reviews:v1</code> does not access the ratings service.</p><blockquote><p>Note: If you previously ran the <a href="./request-routing.html">request routing</a> task, you may need to either log out as test user “jason” or delete the test rules that were created exclusively for him:</p></blockquote><pre><code class="language-bash"> istioctl delete routerule reviews-test-v2
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</code></pre></li><li><p>First, transfer 50% of the traffic from <code>reviews:v1</code> to <code>reviews:v3</code> with the following command:</p><pre><code class="language-bash">istioctl replace -f samples/bookinfo/kube/route-rule-reviews-50-v3.yaml
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</code></pre><p>Notice that we are using <code>istioctl replace</code> instead of <code>create</code>.</p></li><li><p>Refresh the <code>productpage</code> in your browser and you should now see <em>red</em> colored star ratings approximately 50% of the time.</p><blockquote><p>Note: With the current Envoy sidecar implementation, you may need to refresh the <code>productpage</code> very many times to see the proper distribution. It may require 15 refreshes or more before you see any change. You can modify the rules to route 90% of the traffic to v3 to see red stars more often.</p></blockquote></li><li><p>When version v3 of the <code>reviews</code> microservice is considered stable, we can route 100% of the traffic to <code>reviews:v3</code>:</p><pre><code class="language-bash">istioctl replace -f samples/bookinfo/kube/route-rule-reviews-v3.yaml
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</code></pre><p>You can now log into the <code>productpage</code> as any user and you should always see book reviews with <em>red</em> colored star ratings for each review.</p></li></ol><h2 id="understanding-what-happened">Understanding what happened</h2><p>In this task we migrated traffic from an old to new version of the <code>reviews</code> service using Istio’s weighted routing feature. Note that this is very different than version migration using deployment features of container orchestration platforms, which use instance scaling to manage the traffic. With Istio, we can allow the two versions of the <code>reviews</code> service to scale up and down independently, without affecting the traffic distribution between them. For more about version routing with autoscaling, check out <a href="/v0.4/blog/canary-deployments-using-istio.html">Canary Deployments using Istio</a>.</p><h2 id="cleanup">Cleanup</h2><ul><li><p>Remove the application routing rules.</p><pre><code class="language-bash">istioctl delete -f samples/bookinfo/kube/route-rule-all-v1.yaml
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</code></pre></li><li><p>If you are not planning to explore any follow-on tasks, refer to the <a href="/v0.4/docs/guides/bookinfo.html#cleanup">BookInfo cleanup</a> instructions to shutdown the application.</p></li></ul><h2 id="further-reading">Further reading</h2><ul><li>Learn more about <a href="/v0.4/docs/concepts/traffic-management/rules-configuration.html">request routing</a>.</li></ul></div></div></div></div></div></div><script src="/v0.4/js/sidebar.min.js"></script><footer><div class="container"><div class="row"><div class="col-lg-2 col-md-2 col-sm-2"></div><div class="col-lg-3 col-md-3 col-sm-3 col-xs-12 center-block"><ul><li><a class="header" href="/v0.4/docs/welcome">Docs</a></li><li><a href="/v0.4/docs/concepts">Concepts</a></li><li><a href="/v0.4/docs/setup">Setup</a></li><li><a href="/v0.4/docs/tasks">Tasks</a></li><li><a href="/v0.4/docs/guides">Guides</a></li><li><a href="/v0.4/docs/reference">Reference</a></li></ul></div><div class="col-lg-3 col-md-3 col-sm-3 col-xs-12 center-block"><ul><li><a class="header" href="/v0.4/help">Help</a></li><li><a href="/v0.4/faq">FAQ</a></li><li><a href="/v0.4/glossary">Glossary</a></li><li><a href="/v0.4/troubleshooting">Troubleshooting</a></li><li><a href="/v0.4/bugs">Report Bugs</a></li><li><a href="https://github.com/istio/istio.github.io/issues/new?title=Issue with _docs/tasks/traffic-management/traffic-shifting.md">Doc Bugs & Gaps</a></li><li><a href="https://github.com/istio/istio.github.io/edit/master/_docs/tasks/traffic-management/traffic-shifting.md">Edit This Page</a></li></ul></div><div class="col-lg-3 col-md-3 col-sm-3 col-xs-12 center-block"><ul><li> <a class="header" href="/v0.4/community">Community</a></li><li> <a href="https://groups.google.com/forum/#!forum/istio-users" target="_blank" rel="noopener">User</a> | <a href="https://groups.google.com/forum/#!forum/istio-dev" target="_blank" rel="noopener">Dev Mailing Lists</a></li><li><a href="https://twitter.com/IstioMesh" target="_blank" rel="noopener">Twitter</a></li><li><a href="https://stackoverflow.com/questions/tagged/istio" target="_blank" rel="noopener">Stack Overflow</a></li><li><a href="https://github.com/istio/community" target="_blank" rel="noopener">GitHub</a></li><li><a href="https://github.com/istio/community/blob/master/WORKING-GROUPS.md" target="_blank" rel="noopener">Working Groups</a></li></ul></div><div class="col-lg-1 col-md-1 col-sm-1"></div></div><div class="row"><p class="description small text-center"> Istio 0.4, Copyright © 2017 Istio Authors<br> Archived on 20-Dec-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="https://cdnjs.cloudflare.com/ajax/libs/jquery.form/4.2.1/jquery.form.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-visible/1.2.0/jquery.visible.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.6.0/slick.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/1.7.1/clipboard.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> <script src="/v0.4/js/common.min.js"></script> <script src="/v0.4/js/search.js"></script> <script src="/v0.4/js/prism.min.js"></script></body></html>
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