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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>Configuring Request Routing</h1><p>This task shows you how to configure dynamic request routing based on weights and HTTP headers.</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="content-based-routing">Content-based routing</h2><p>Because the BookInfo sample deploys 3 versions of the reviews microservice, we need to set a default route. Otherwise if you access the application several times, you’ll notice that sometimes the output contains star ratings. This is because without an explicit default version set, Istio will route requests to all available versions of a service in a random fashion.</p><blockquote><p>Note: This task 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><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><blockquote><p>Note: In a Kubernetes deployment of Istio, you can replace <code>istioctl</code> with <code>kubectl</code> in the above, and for all other CLI commands. Note, however, that <code>kubectl</code> currently does not provide input validation.</p></blockquote><p>You can display the routes that are defined with the following command:</p><pre><code class="language-bash">istioctl get routerules -o yaml
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</code></pre><pre><code class="language-yaml">apiVersion: config.istio.io/v1alpha2
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kind: RouteRule
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metadata:
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name: details-default
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namespace: default
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...
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spec:
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destination:
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name: details
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precedence: 1
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route:
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- labels:
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version: v1
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---
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apiVersion: config.istio.io/v1alpha2
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kind: RouteRule
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metadata:
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name: productpage-default
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namespace: default
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...
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spec:
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destination:
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name: productpage
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precedence: 1
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route:
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- labels:
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version: v1
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---
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apiVersion: config.istio.io/v1alpha2
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kind: RouteRule
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metadata:
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name: ratings-default
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namespace: default
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...
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spec:
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destination:
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name: ratings
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precedence: 1
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route:
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- labels:
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version: v1
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---
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apiVersion: config.istio.io/v1alpha2
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kind: RouteRule
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metadata:
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name: reviews-default
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namespace: default
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...
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spec:
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destination:
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name: reviews
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precedence: 1
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route:
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- labels:
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version: v1
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---
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</code></pre><p>Since rule propagation to the proxies is asynchronous, you should wait a few seconds for the rules to propagate to all pods before attempting to access the application.</p></li><li><p>Open the BookInfo URL (http://$GATEWAY_URL/productpage) in your browser</p><p>You should see the BookInfo application productpage displayed. Notice that the <code>productpage</code> is displayed with no rating stars since <code>reviews:v1</code> does not access the ratings service.</p></li><li><p>Route a specific user to <code>reviews:v2</code></p><p>Lets enable the ratings service for test user “jason” by routing productpage traffic to <code>reviews:v2</code> instances.</p><pre><code class="language-bash">istioctl create -f samples/bookinfo/kube/route-rule-reviews-test-v2.yaml
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</code></pre><p>Confirm the rule is created:</p><pre><code class="language-bash">istioctl get routerule reviews-test-v2 -o yaml
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</code></pre><pre><code class="language-yaml">apiVersion: config.istio.io/v1alpha2
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kind: RouteRule
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metadata:
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name: reviews-test-v2
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namespace: default
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...
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spec:
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destination:
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name: reviews
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match:
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request:
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headers:
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cookie:
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regex: ^(.*?;)?(user=jason)(;.*)?$
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precedence: 2
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route:
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- labels:
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version: v2
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</code></pre></li><li><p>Log in as user “jason” at the <code>productpage</code> web page.</p><p>You should now see ratings (1-5 stars) next to each review. Notice that if you log in as any other user, you will continue to see <code>reviews:v1</code>.</p></li></ol><h2 id="understanding-what-happened">Understanding what happened</h2><p>In this task, you used Istio to send 100% of the traffic to the v1 version of each of the BookInfo services. You then set a rule to selectively send traffic to version v2 of the reviews service based on a header (i.e., a user cookie) in a request.</p><p>Once the v2 version has been tested to our satisfaction, we could use Istio to send traffic from all users to v2, optionally in a gradual fashion. We’ll explore this in a separate task.</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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istioctl delete -f samples/bookinfo/kube/route-rule-reviews-test-v2.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/request-routing.md">Doc Bugs & Gaps</a></li><li><a href="https://github.com/istio/istio.github.io/edit/master/_docs/tasks/traffic-management/request-routing.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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