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<button id=search-close title="Cancel search" type=reset aria-label="Cancel search"><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#cancel-x"/></svg></button></form></nav></header><main class=primary><div id=sidebar-container class="sidebar-container sidebar-offcanvas"><nav id=sidebar aria-label="Section Navigation"><div class=directory><div class=card><button class="header dynamic" id=card0 title="Blog posts for 2019." aria-controls=card0-body><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#blog"/></svg>2019 Posts</button><div class=body aria-labelledby=card0 role=region id=card0-body><ul role=tree aria-expanded=true class=leaf-section aria-labelledby=card0><li role=none><a role=treeitem title="Istio 1.1.14 patch release." href=/v1.2/blog/2019/announcing-1.1.14/>Announcing Istio 1.1.14</a></li><li role=none><a role=treeitem title="Istio 1.2.5 patch release." href=/v1.2/blog/2019/announcing-1.2.5/>Announcing Istio 1.2.5</a></li><li role=none><a role=treeitem title="Upcoming Istio 1.1 end of life announcement." href=/v1.2/blog/2019/announcing-1.1-eol/>Support for Istio 1.1 ends on September 19th, 2019</a></li><li role=none><a role=treeitem title="Istio 1.1.13 patch release." href=/v1.2/blog/2019/announcing-1.1.13/>Announcing Istio 1.1.13</a></li><li role=none><a role=treeitem title="Istio 1.2.4 patch release." href=/v1.2/blog/2019/announcing-1.2.4/>Announcing Istio 1.2.4</a></li><li role=none><a role=treeitem title="Security vulnerability disclosure for multiple CVEs." href=/v1.2/blog/2019/istio-security-003-004/>Security Update - ISTIO-SECURITY-003 and ISTIO-SECURITY-004</a></li><li role=none><a role=treeitem title="The design principles behind Istio's APIs and how those APIs are evolving." href=/v1.2/blog/2019/evolving-istios-apis/>The Evolution of Istio's APIs</a></li><li role=none><a role=treeitem title="Istio 1.1.12 patch release." href=/v1.2/blog/2019/announcing-1.1.12/>Announcing Istio 1.1.12</a></li><li role=none><a role=treeitem title="Istio 1.2.3 patch release." href=/v1.2/blog/2019/announcing-1.2.3/>Announcing Istio 1.2.3</a></li><li role=none><a role=treeitem title="Comparison of alternative solutions to control egress traffic including performance considerations." href=/v1.2/blog/2019/egress-traffic-control-in-istio-part-3/>Secure Control of Egress Traffic in Istio, part 3</a></li><li role=none><a role=treeitem title="Use Istio Egress Traffic Control to prevent attacks involving egress traffic." href=/v1.2/blog/2019/egress-traffic-control-in-istio-part-2/>Secure Control of Egress Traffic in Istio, part 2</a></li><li role=none><a role=treeitem title="Tools and guidance for evaluating Istio's data plane performance." href=/v1.2/blog/2019/performance-best-practices/>Best Practices: Benchmarking Service Mesh Performance</a></li><li role=none><a role=treeitem title="Istio 1.1.11 patch release." href=/v1.2/blog/2019/announcing-1.1.11/>Announcing Istio 1.1.11</a></li><li role=none><a role=treeitem title="Istio 1.0.9 patch release." href=/v1.2/blog/2019/announcing-1.0.9/>Announcing Istio 1.0.9</a></li><li role=none><a role=treeitem title="Istio 1.1.10 patch release." href=/v1.2/blog/2019/announcing-1.1.10/>Announcing Istio 1.1.10</a></li><li role=none><a role=treeitem title="Istio 1.2.2 patch release." href=/v1.2/blog/2019/announcing-1.2.2/>Announcing Istio 1.2.2</a></li><li role=none><a role=treeitem title="Security vulnerability disclosure for CVE-2019-12995." href=/v1.2/blog/2019/cve-2019-12995/>Security Update - CVE-2019-12995</a></li><li role=none><a role=treeitem title="Istio 1.2.1 patch release." href=/v1.2/blog/2019/announcing-1.2.1/>Announcing Istio 1.2.1</a></li><li role=none><a role=treeitem title="Istio 1.0 end of life announcement." href=/v1.2/blog/2019/announcing-1.0-eol-final/>Support for Istio 1.0 has ended</a></li><li role=none><a role=treeitem title="Istio 1.2 release announcement." href=/v1.2/blog/2019/announcing-1.2/>Announcing Istio 1.2</a></li><li role=none><a role=treeitem title="Istio 1.1.9 patch release." href=/v1.2/blog/2019/announcing-1.1.9/>Announcing Istio 1.1.9</a></li><li role=none><a role=treeitem title="Istio 1.0.8 patch release." href=/v1.2/blog/2019/announcing-1.0.8/>Announcing Istio 1.0.8</a></li><li role=none><a role=treeitem title="Learn how to extend the lifetime of Istio self-signed root certificate." href=/v1.2/blog/2019/root-transition/>Extending Istio Self-Signed Root Certificate Lifetime</a></li><li role=none><a role=treeitem title="Istio 1.1.8 patch release." href=/v1.2/blog/2019/announcing-1.1.8/>Announcing Istio 1.1.8</a></li><li role=none><a role=treeitem title="Security vulnerability disclosure for CVE-2019-12243." href=/v1.2/blog/2019/cve-2019-12243/>Security Update - CVE-2019-12243</a></li><li role=none><a role=treeitem title="Upcoming Istio 1.0 end of life announcement." href=/v1.2/blog/2019/announcing-1.0-eol/>Support for Istio 1.0 ends on June 19th, 2019</a></li><li role=none><a role=treeitem title="Attacks involving egress traffic and requirements for egress traffic control." href=/v1.2/blog/2019/egress-traffic-control-in-istio-part-1/>Secure Control of Egress Traffic in Istio, part 1</a></li><li role=none><a role=treeitem title="Istio 1.1.7 patch release." href=/v1.2/blog/2019/announcing-1.1.7/>Announcing Istio 1.1.7</a></li><li role=none><a role=treeitem title="Istio 1.1.6 patch release." href=/v1.2/blog/2019/announcing-1.1.6/>Announcing Istio 1.1.6</a></li><li role=none><a role=treeitem title="Istio 1.1.5 patch release." href=/v1.2/blog/2019/announcing-1.1.5/>Announcing Istio 1.1.5</a></li><li role=none><a role=treeitem title="Istio 1.1.4 patch release." href=/v1.2/blog/2019/announcing-1.1.4/>Announcing Istio 1.1.4</a></li><li role=none><a role=treeitem title="Istio 1.1.3 patch release." href=/v1.2/blog/2019/announcing-1.1.3/>Announcing Istio 1.1.3</a></li><li role=none><a role=treeitem title="Istio 1.0.7 patch releases." href=/v1.2/blog/2019/announcing-1.0.7/>Announcing Istio 1.0.7 with Important Security Update</a></li><li role=none><a role=treeitem title="Istio 1.1.2 patch release." href=/v1.2/blog/2019/announcing-1.1.2/>Announcing Istio 1.1.2 with Important Security Update</a></li><li role=none><a role=treeitem title="Istio 1.1.1 patch release." href=/v1.2/blog/2019/announcing-1.1.1/>Announcing Istio 1.1.1</a></li><li role=none><a role=treeitem title="Istio 1.1 release announcement." href=/v1.2/blog/2019/announcing-1.1/>Announcing Istio 1.1</a></li><li role=none><a role=treeitem title="An overview of Istio 1.1 performance." href=/v1.2/blog/2019/istio1.1_perf/>Architecting Istio 1.1 for Performance</a></li><li role=none><a role=treeitem title="Istio 1.0.6 patch release." href=/v1.2/blog/2019/announcing-1.0.6/>Announcing Istio 1.0.6</a></li><li role=none><a role=treeitem title="Configuring Istio route rules in a multicluster service mesh." href=/v1.2/blog/2019/multicluster-version-routing/>Version Routing in a Multicluster Service Mesh</a></li><li role=none><a role=treeitem title="Announces the new Istio blog policy." href=/v1.2/blog/2019/sail-the-blog/>Sail the Blog!</a></li><li role=none><a role=treeitem title="De-mystify how Istio manages to plugin its data-plane components into an existing deployment." href=/v1.2/blog/2019/data-plane-setup/>Demystifying Istio's Sidecar Injection Model</a></li><li role=none><a role=treeitem title="Verifies the performance impact of adding an egress gateway." href=/v1.2/blog/2019/egress-performance/>Egress Gateway Performance Investigation</a></li><li role=none><a role=treeitem title="Addressing application startup ordering and startup latency using AppSwitch." href=/v1.2/blog/2019/appswitch/>Sidestepping Dependency Ordering with AppSwitch</a></li><li role=none><a role=treeitem title="Istio has a new discussion board." href=/v1.2/blog/2019/announcing-discuss.istio.io/>Announcing discuss.istio.io</a></li><li role=none><a role=treeitem title="Describes how to deploy a custom ingress gateway using cert-manager manually." href=/v1.2/blog/2019/custom-ingress-gateway/>Deploy a Custom Ingress Gateway Using Cert-Manager</a></li></ul></div></div><div class=card><button class="header dynamic" id=card1 title="Blog posts for 2018." aria-controls=card1-body><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#blog"/></svg>2018 Posts</button><div class="body default" aria-labelledby=card1 role=region id=card1-body><ul role=tree aria-expanded=true class=leaf-section aria-labelledby=card1><li role=none><a role=treeitem title="Istio 1.0.5 patch release." href=/v1.2/blog/2018/announcing-1.0.5/>Announcing Istio 1.0.5</a></li><li role=none><a role=treeitem title="Istio 1.0.4 patch release." href=/v1.2/blog/2018/announcing-1.0.4/>Announcing Istio 1.0.4</a></li><li role=none><a role=treeitem title="How to use Istio for traffic management without deploying sidecar proxies." href=/v1.2/blog/2018/incremental-traffic-management/>Incremental Istio Part 1, Traffic Management</a></li><li role=none><a role=treeitem title="Describes a simple scenario based on Istio's Bookinfo example." href=/v1.2/blog/2018/egress-mongo/>Consuming External MongoDB Services</a></li><li role=none><a role=treeitem title="Istio 1.0.3 patch release." href=/v1.2/blog/2018/announcing-1.0.3/>Announcing Istio 1.0.3</a></li><li role=none><a role=treeitem title="Istio 1.0.2 patch release." href=/v1.2/blog/2018/announcing-1.0.2/>Announcing Istio 1.0.2</a></li><li role=none><a role=treeitem title="Istio 1.0.1 patch release." href=/v1.2/blog/2018/announcing-1.0.1/>Announcing Istio 1.0.1</a></li><li role=none><a role=treeitem title="Istio hosting an all day Twitch stream to celebrate the 1.0 release." href=/v1.2/blog/2018/istio-twitch-stream/>All Day Istio Twitch Stream</a></li><li role=none><a role=treeitem title="Istio is ready for production use with its 1.0 release." href=/v1.2/blog/2018/announcing-1.0/>Announcing Istio 1.0</a></li><li role=none><a role=treeitem title="How HP is building its next-generation footwear personalization platform on Istio." href=/v1.2/blog/2018/hp/>Istio a Game Changer for HP's FitStation Platform</a></li><li role=none><a role=treeitem title="Automatic application onboarding and latency optimizations using AppSwitch." href=/v1.2/blog/2018/delayering-istio/>Delayering Istio with AppSwitch</a></li><li role=none><a role=treeitem title="Describe Istio's authorization feature and how to use it in various use cases." href=/v1.2/blog/2018/istio-authorization/>Micro-Segmentation with Istio Authorization</a></li><li role=none><a role=treeitem title="How to export Istio Access Logs to different sinks like BigQuery, GCS, Pub/Sub through Stackdriver." href=/v1.2/blog/2018/export-logs-through-stackdriver/>Exporting Logs to BigQuery, GCS, Pub/Sub through Stackdriver</a></li><li role=none><a role=treeitem title="Describes how to configure Istio for monitoring and access policies of HTTP egress traffic." href=/v1.2/blog/2018/egress-monitoring-access-control/>Monitoring and Access Policies for HTTP Egress Traffic</a></li><li role=none><a role=treeitem title="Introduction, motivation and design principles for the Istio v1alpha3 routing API." href=/v1.2/blog/2018/v1alpha3-routing/>Introducing the Istio v1alpha3 routing API</a></li><li role=none><a role=treeitem title="Describes how to configure Istio ingress with a network load balancer on AWS." href=/v1.2/blog/2018/aws-nlb/>Configuring Istio Ingress with AWS NLB</a></li><li role=none><a role=treeitem title="Using Kubernetes namespaces and RBAC to create an Istio soft multi-tenancy environment." href=/v1.2/blog/2018/soft-multitenancy/>Istio Soft Multi-Tenancy Support</a></li><li role=none><span role=treeitem class=current title="An introduction to safer, lower-risk deployments and release to production.">Traffic Mirroring with Istio for Testing in Production</span></li><li role=none><a role=treeitem title="Describes a simple scenario based on Istio's Bookinfo example." href=/v1.2/blog/2018/egress-tcp/>Consuming External TCP Services</a></li><li role=none><a role=treeitem title="Describes a simple scenario based on Istio's Bookinfo example." href=/v1.2/blog/2018/egress-https/>Consuming External Web Services</a></li></ul></div></div><div class=card><button class="header dynamic" id=card2 title="Blog posts for 2017." aria-controls=card2-body><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#blog"/></svg>2017 Posts</button><div class=body aria-labelledby=card2 role=region id=card2-body><ul role=tree aria-expanded=true class=leaf-section aria-labelledby=card2><li role=none><a role=treeitem title="Improving availability and reducing latency." href=/v1.2/blog/2017/mixer-spof-myth/>Mixer and the SPOF Myth</a></li><li role=none><a role=treeitem title="Provides an overview of Mixer's plug-in architecture." href=/v1.2/blog/2017/adapter-model/>Mixer Adapter Model</a></li><li role=none><a role=treeitem title="Istio 0.2 announcement." href=/v1.2/blog/2017/0.2-announcement/>Announcing Istio 0.2</a></li><li role=none><a role=treeitem title="How Kubernetes Network Policy relates to Istio policy." href=/v1.2/blog/2017/0.1-using-network-policy/>Using Network Policy with Istio</a></li><li role=none><a role=treeitem title="Using Istio to create autoscaled canary deployments." href=/v1.2/blog/2017/0.1-canary/>Canary Deployments using Istio</a></li><li role=none><a role=treeitem title="Istio Auth 0.1 announcement." href=/v1.2/blog/2017/0.1-auth/>Using Istio to Improve End-to-End Security</a></li><li role=none><a role=treeitem title="Istio 0.1 announcement." href=/v1.2/blog/2017/0.1-announcement/>Introducing Istio</a></li></ul></div></div></div></nav></div><div class=article-container><button tabindex=-1 id=sidebar-toggler title="Toggle the navigation bar"><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#pull"/></svg></button><nav aria-label=Breadcrumb><ol><li><a href=/v1.2/ title="Connect, secure, control, and observe services.">Istio</a></li><li><a href=/v1.2/blog/ title="Posts about using Istio.">Blog</a></li><li><a href=/v1.2/blog/2018/ title="Blog posts for 2018.">2018 Posts</a></li><li>Traffic Mirroring with Istio for Testing in Production</li></ol></nav><article aria-labelledby=title><div class=title-area><div><h1 id=title>Traffic Mirroring with Istio for Testing in Production</h1><p class=subtitle>Routing rules for HTTP traffic</p><p class=byline><span>By</span>
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<span class=attribution>Christian Posta</span><span> | </span><span><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#calendar"/></svg><span> </span>February 8, 2018</span><span> | </span><span title="224 words"><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#clock"/></svg><span> </span>2 minute read</span></p></div></div><nav class=toc-inlined aria-label="Table of Contents"><div><hr><ol><li role=none aria-label="See also"><a href=#see-also>See also</a></li></ol><hr></div></nav><p>Trying to enumerate all the possible combinations of test cases for testing services in non-production/test environments can be daunting. In some cases, you’ll find that all of the effort that goes into cataloging these use cases doesn’t match up to real production use cases. Ideally, we could use live production use cases and traffic to help illuminate all of the feature areas of the service under test that we might miss in more contrived testing environments.</p><p>Istio can help here. With the release of <a href=/v1.2/about/notes/older/0.5/>Istio 0.5.0</a>, Istio can mirror traffic to help test your services. You can write route rules similar to the following to enable traffic mirroring:</p><pre><code class=language-yaml data-expandlinks=true>apiVersion: config.istio.io/v1alpha2
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kind: RouteRule
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metadata:
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name: mirror-traffic-to-httbin-v2
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spec:
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destination:
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name: httpbin
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precedence: 11
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route:
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- labels:
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version: v1
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weight: 100
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- labels:
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version: v2
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weight: 0
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mirror:
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name: httpbin
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labels:
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version: v2
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</code></pre><p>A few things to note here:</p><ul><li>When traffic gets mirrored to a different service, that happens outside the critical path of the request</li><li>Responses to any mirrored traffic is ignored; traffic is mirrored as “fire-and-forget”</li><li>You’ll need to have the 0-weighted route to hint to Istio to create the proper Envoy cluster under the covers; <a href=https://github.com/istio/istio/issues/3270>this should be ironed out in future releases</a>.</li></ul><p>Learn more about mirroring by visiting the <a href=/v1.2/docs/tasks/traffic-management/mirroring/>Mirroring Task</a> and see a more
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<a href=https://dzone.com/articles/traffic-shadowing-with-istio-reducing-the-risk-of>comprehensive treatment of this scenario on my blog</a>.</p><nav id=see-also><h2>See also</h2><div class=see-also><div class=entry><p class=link><a data-skipendnotes=true href=/v1.2/docs/tasks/traffic-management/mirroring/>Mirroring</a></p><p class=desc>This task demonstrates the traffic mirroring/shadowing capabilities of Istio.</p></div><div class=entry><p class=link><a data-skipendnotes=true href=/v1.2/blog/2019/egress-traffic-control-in-istio-part-3/>Secure Control of Egress Traffic in Istio, part 3</a></p><p class=desc>Comparison of alternative solutions to control egress traffic including performance considerations.</p></div><div class=entry><p class=link><a data-skipendnotes=true href=/v1.2/blog/2019/egress-traffic-control-in-istio-part-2/>Secure Control of Egress Traffic in Istio, part 2</a></p><p class=desc>Use Istio Egress Traffic Control to prevent attacks involving egress traffic.</p></div><div class=entry><p class=link><a data-skipendnotes=true href=/v1.2/blog/2019/egress-traffic-control-in-istio-part-1/>Secure Control of Egress Traffic in Istio, part 1</a></p><p class=desc>Attacks involving egress traffic and requirements for egress traffic control.</p></div><div class=entry><p class=link><a data-skipendnotes=true href=/v1.2/blog/2019/multicluster-version-routing/>Version Routing in a Multicluster Service Mesh</a></p><p class=desc>Configuring Istio route rules in a multicluster service mesh.</p></div><div class=entry><p class=link><a data-skipendnotes=true href=/v1.2/blog/2019/data-plane-setup/>Demystifying Istio's Sidecar Injection Model</a></p><p class=desc>De-mystify how Istio manages to plugin its data-plane components into an existing deployment.</p></div></div></nav></article><nav class=pagenav><div class=left><a title="Using Kubernetes namespaces and RBAC to create an Istio soft multi-tenancy environment." href=/v1.2/blog/2018/soft-multitenancy/><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#left-arrow"/></svg>Istio Soft Multi-Tenancy Support</a></div><div class=right><a title="Describes a simple scenario based on Istio's Bookinfo example." href=/v1.2/blog/2018/egress-tcp/>Consuming External TCP Services<svg class="icon"><use xlink:href="/v1.2/img/icons.svg#right-arrow"/></svg></a></div></nav><div id=endnotes-container aria-hidden=true><h2>Links</h2><ol id=endnotes></ol></div></div><div class=toc-container><nav class=toc aria-label="Table of Contents"><div id=toc><ol><li role=none aria-label="See also"><a href=#see-also>See also</a></li></ol></div></nav></div></main><footer><div class=user-links><a class=channel title="Go download Istio 1.2.5 now" href=https://github.com/istio/istio/releases/tag/1.2.5 aria-label="Download Istio"><span>download</span><svg class="icon"><use xlink:href="/v1.2/img/icons.svg#download"/></svg>
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