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<button id=search-close title='Cancel search' type=reset aria-label='Cancel search'><svg class="icon menu-close"><use xlink:href="/v1.24/img/icons.svg#menu-close"/></svg></button></form></nav></header><div class=banner-container><a href=https://events.linuxfoundation.org/kubecon-cloudnativecon-europe/co-located-events/istio-day/ class=banner data-title="Istio Day Europe-2025-01-31 00:00:00 +0000 UTC" data-period-start=1738281600000 data-period-end=1743465600000 data-max-impressions data-timeout><div class=content><p>Join us for Istio Day Europe, a KubeCon + CloudNativeCon Europe Co-located Event. 01 April 2025, London, England. Register now!</p></div><div class=frame></div></a></div><article class=post itemscope itemtype=http://schema.org/BlogPosting><div class=header-content><h1>Traffic Mirroring with Istio for Testing in Production</h1><p>An introduction to safer, lower-risk deployments and release to production.</p></div><p class=post-author>Feb 8, 2018 <span>| </span>By Christian Posta</p><div><aside class="callout warning"><div class=type><svg class="large-icon"><use xlink:href="/v1.24/img/icons.svg#callout-warning"/></svg></div><div class=content>This blog post was written assuming Istio 0.5, so some of this content may now be outdated.</div></aside></div><div><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=/v1.24/news/releases/0.x/announcing-0.5/>Istio 0.5</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 data-repo=istio>apiVersion: config.istio.io/v1alpha2
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kind: RouteRule
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metadata:
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name: mirror-traffic-to-httpbin-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</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=/v1.24/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></div><div class=share-social><div class=heading>Share this post</div><div class=share-buttons><a href="https://www.linkedin.com/shareArticle?mini=true&url=%2fv1.24%2fblog%2f2018%2ftraffic-mirroring%2f" target=_blank><img class=share-icon src=/v1.24/img/social/linkedin.svg alt="Share to LinkedIn">
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