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<!DOCTYPE html><html lang="en" itemscope itemtype="https://schema.org/WebPage" style="overflow-y: scroll;"><head><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1"><meta name="title" content="Overview"><meta name="og:title" content="Overview"><meta name="og:image" content="/v0.1/img/logo.png"/><meta name="description" content="Provides a conceptual overview of traffic management in Istio and the features it enables."><meta name="og:description" content="Provides a conceptual overview of traffic management in Istio and the features it enables."><title>Istioldie 0.1 / Overview</title><script> window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date; ga('create', 'UA-98480406-2', 'auto'); ga('send', 'pageview'); </script> <script async src='https://www.google-analytics.com/analytics.js'></script><link 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href="/v0.1/docs/reference/index.html">Reference</a></li></ul></div></div></div><script src="/v0.1/js/navtree.js"></script><div class="container docs"><div class="row"><div class="col-md-11 nofloat center-block"><div class="row"><div id="sidebar-container" class="col-sm-3"><ul class="doc-side-nav"><li><h5 class='doc-side-nav-title'>Concepts</h5></li><script type="text/javascript"> var docs = []; docs.push({path: [ "index.md", ], url: "/docs/concepts/index.html", title: "Concepts", order: 10, overview: "Concepts help you learn about the different parts of the Istio system and the abstractions it uses."}); docs.push({path: [ "network-and-auth", "auth.md", ], url: "/docs/concepts/network-and-auth/auth.html", title: "Auth", order: 10, overview: "Architectural deep-dive into the design of Auth, which provides the secure communication channel and strong identity for Istio."}); docs.push({path: [ "network-and-auth", "index.md", ], url: "/docs/concepts/network-and-auth/index.html", title: "Network and Auth", order: 30, overview: "Introduces core network and authentication functionality."}); docs.push({path: [ "policy-and-control", "attributes.md", ], url: "/docs/concepts/policy-and-control/attributes.html", title: "Attributes", order: 10, overview: "Explains the important notion of attributes, which is a central mechanism for how policies and control are applied to services within the mesh."}); docs.push({path: [ "policy-and-control", "index.md", ], url: "/docs/concepts/policy-and-control/index.html", title: "Policies and Control", order: 40, overview: "Introduces the policy control mechanisms."}); docs.push({path: [ "policy-and-control", "mixer-aspect-config.md", ], url: "/docs/concepts/policy-and-control/mixer-aspect-config.html", title: "Mixer Aspect Configuration", order: 38, overview: "Explains how to configure a Mixer Aspect and its dependencies."}); docs.push({path: [ "policy-and-control", "mixer-config.md", ], url: "/docs/concepts/policy-and-control/mixer-config.html", title: "Mixer Configuration", order: 30, overview: "An overview of the key concepts used to configure Mixer."}); docs.push({path: [ "policy-and-control", "mixer.md", ], url: "/docs/concepts/policy-and-control/mixer.html", title: "Mixer", order: 20, overview: "Architectural deep-dive into the design of Mixer, which provides the policy and control mechanisms within the service mesh."}); docs.push({path: [ "traffic-management", "fault-injection.md", ], url: "/docs/concepts/traffic-management/fault-injection.html", title: "Fault Injection", order: 40, overview: "Introduces the idea of systematic fault injection that can be used to uncover conflicting failure recovery policies across services."}); docs.push({path: [ "traffic-management", "handling-failures.md", ], url: "/docs/concepts/traffic-management/handling-failures.html", title: "Handling Failures", order: 30, overview: "An overview of failure recovery capabilities in Envoy that can be leveraged by unmodified applications to improve robustness and prevent cascading failures."}); docs.push({path: [ "traffic-management", "index.md", ], url: "/docs/concepts/traffic-management/index.html", title: "Traffic Management", order: 20, overview: "Describes the various Istio features focused on traffic routing and control."}); docs.push({path: [ "traffic-management", "load-balancing.md", ], url: "/docs/concepts/traffic-management/load-balancing.html", title: "Discovery & Load Balancing", order: 25, overview: "Describes how traffic is load balanced across instances of a service in the mesh."}); docs.push({path: [ "traffic-management", "overview.md", ], url: "/docs/concepts/traffic-management/overview.html", title: "Overview", order: 0, overview: "Provides a conceptual overview of traffic management in Istio and the features it enables."}); docs.push({path: [ "traffic-management", "pilot.md", ], url: "/docs/concepts/traffic-management/pilot.html", title: "Pilot", order: 10, overview: "Introduces Pilot, the component responsible for managing a distributed deployment of Envoy proxies in the service mesh."}); docs.push({path: [ "traffic-management", "request-routing.md", ], url: "/docs/concepts/traffic-management/request-routing.html", title: "Request Routing", order: 20, overview: "Describes how requests are routed between services in an Istio service mesh."}); docs.push({path: [ "traffic-management", "rules-configuration.md", ], url: "/docs/concepts/traffic-management/rules-configuration.html", title: "Rules Configuration", order: 50, overview: "Provides a high-level overview of the domain-specific language used by Istio to configure traffic management rules in the service mesh."}); docs.push({path: [ "what-is-istio", "goals.md", ], url: "/docs/concepts/what-is-istio/goals.html", title: "Design Goals", order: 20, overview: "Describes the core principles that Istio's design adheres to."}); docs.push({path: [ "what-is-istio", "index.md", ], url: "/docs/concepts/what-is-istio/index.html", title: "What is Istio?", order: 10, overview: "A broad overview of the Istio system."}); docs.push({path: [ "what-is-istio", "overview.md", ], url: "/docs/concepts/what-is-istio/overview.html", title: "Overview", order: 15, overview: "Provides a conceptual introduction to Istio, including the problems it solves and its high-level architecture."}); 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>Overview</h1><p>This page provides an overview of how traffic management works in Istio, including the benefits of its traffic management principles. It assumes that you’ve already read <a href="/v0.1/docs/concepts/what-is-istio/overview.html">What Is Istio?</a> and are familiar with Istio’s high-level architecture. You can find out more about individual traffic management features in the other guides in this section.</p><h2 id="pilot-and-envoy">Pilot and Envoy</h2><p>The core component used for traffic management in Istio is <a href="./pilot.html">Pilot</a>, which manages and configures all the Envoy proxy instances deployed in a particular Istio service mesh. It lets you specify what rules you want to use to route traffic between Envoy proxies and configure failure recovery features such as timeouts, retries, and circuit breakers. It also maintains a canonical model of all the services in the mesh and uses this to let Envoys know about the other instances in the mesh via its discovery service.</p><p>Each Envoy instance maintains <a href="./load-balancing.html">load balancing information</a> based on the information it gets from Pilot and periodic health-checks of other instances in its load-balancing pool, allowing it to intelligently distribute traffic between destination instances while following its specified routing rules.</p><h2 id="traffic-management-benefits">Traffic management benefits</h2><p>Using Istio’s traffic management model essentially decouples traffic flow and infrastructure scaling, letting operators specify via Pilot what rules they want traffic to follow rather than which specific pods/VMs should receive traffic - Pilot and intelligent Envoy proxies look after the rest. So, for example, you can specify via Pilot that you want 5% of traffic for a particular service to go to a canary version irrespective of the size of the canary deployment, or send traffic to a particular version depending on the content of the request.</p><figure><img style="max-width:85%;" src="./img/pilot/TrafficManagementOverview.svg" alt="Traffic Management with Istio" title="Traffic Management with Istio" /><figcaption>Traffic Management with Istio</figcaption></figure><p>Decoupling traffic flow from infrastructure scaling like this allows Istio to provide a variety of traffic management features that live outside the application code. As well as dynamic <a href="request-routing.html">request routing</a> for A/B testing, gradual rollouts, and canary releases, it also handles <a href="handling-failures.html">failure recovery</a> using timeouts, retries, and circuit breakers, and finally <a href="fault-injection.html">fault injection</a> to test the compatibility of failure recovery policies across services. These capabilities are all realized through the Envoy sidecars/proxies deployed across the service mesh.</p></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/concepts/traffic-management/overview.md">Report a Doc Issue</a></li><li><a href="https://github.com/istio/istio.github.io/edit/master/_docs/concepts/traffic-management/overview.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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