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<h1 id="title">Traffic Management</h1>
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<h4 id="viewing-current-rules">Q: How can I view the current route rules I have configured with Istio?</h4>
<p>Rules can be viewed using <code>istioctl get routerules -o yaml</code> or <code>kubectl get routerules -o yaml</code>.</p>
<h4 id="weighted-rules-not-working">Q: Why is creating a weighted route rule to split traffic between two versions of a service not working as expected?</h4>
<p>For the current Envoy sidecar implementation, up to 100 requests may be required for the desired
distribution to be observed.</p>
<h4 id="unreachable-services">Q: How come some of my services are unreachable after creating route rules?</h4>
<p>This is an known issue with the current Envoy sidecar implementation. After two seconds of creating the
rule, services should become available.</p>
<h4 id="ingress-with-no-route-rules">Q: Can I use standard Ingress specification without any route rules?</h4>
<p>Simple ingress specifications, with host, TLS, and exact path based
matches will work out of the box without the need for route
rules. However, note that the path used in the ingress resource should
not have any <code>.</code> characters.</p>
<p>For example, the following ingress resource matches requests for the
example.com host, with /helloworld as the URL.</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-bash" data-lang="bash">cat <span style="color:#e6db74">&lt;&lt;EOF | kubectl create -f -
</span><span style="color:#e6db74">apiVersion: extensions/v1beta1
</span><span style="color:#e6db74">kind: Ingress
</span><span style="color:#e6db74">metadata:
</span><span style="color:#e6db74">name: simple-ingress
</span><span style="color:#e6db74">annotations:
</span><span style="color:#e6db74"> kubernetes.io/ingress.class: istio
</span><span style="color:#e6db74">spec:
</span><span style="color:#e6db74">rules:
</span><span style="color:#e6db74">- host: example.com
</span><span style="color:#e6db74"> http:
</span><span style="color:#e6db74"> paths:
</span><span style="color:#e6db74"> - path: /helloworld
</span><span style="color:#e6db74"> backend:
</span><span style="color:#e6db74"> serviceName: myservice
</span><span style="color:#e6db74"> servicePort: grpc
</span><span style="color:#e6db74">EOF</span>
</code></pre></div><p>However, the following rules will not work because it uses regular
expressions in the path and uses <code>ingress.kubernetes.io</code> annotations:</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-bash" data-lang="bash">cat <span style="color:#e6db74">&lt;&lt;EOF | kubectl create -f -
</span><span style="color:#e6db74">apiVersion: extensions/v1beta1
</span><span style="color:#e6db74">kind: Ingress
</span><span style="color:#e6db74">metadata:
</span><span style="color:#e6db74">name: this-will-not-work
</span><span style="color:#e6db74">annotations:
</span><span style="color:#e6db74"> kubernetes.io/ingress.class: istio
</span><span style="color:#e6db74"> # Ingress annotations other than ingress class will not be honored
</span><span style="color:#e6db74"> ingress.kubernetes.io/rewrite-target: /
</span><span style="color:#e6db74">spec:
</span><span style="color:#e6db74">rules:
</span><span style="color:#e6db74">- host: example.com
</span><span style="color:#e6db74"> http:
</span><span style="color:#e6db74"> paths:
</span><span style="color:#e6db74"> - path: /hello(.*?)world/
</span><span style="color:#e6db74"> backend:
</span><span style="color:#e6db74"> serviceName: myservice
</span><span style="color:#e6db74"> servicePort: grpc
</span><span style="color:#e6db74">EOF</span>
</code></pre></div>
<h4 id="naming-port-convention">Q: What is the naming convention for port name inside my application deployment file?</h4>
<p>Named ports: Service ports must be named.</p>
<p>The port names must be of the form <code>protocol</code>-<code>suffix</code> with http, http2, grpc, mongo, or redis as the <code>protocol</code> in order to take advantage of Istios routing features.</p>
<p>For example, <code>name: http2-foo</code> or <code>name: http</code> are valid port names, but <code>name: http2foo</code> is not. If the port name does not begin with a recognized prefix or if the port is unnamed, traffic on the port will be treated as plain TCP traffic (unless the port explicitly uses Protocol: UDP to signify a UDP port).</p>
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<path d="M245,286.131c-2.083,0-4.167-0.649-5.931-1.948L48.64,143.929c-4.446-3.275-5.396-9.535-2.121-13.982
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</svg>
</a>
</div>
<div class="icon">
<span>github</span>
<a title="GitHub is where development takes place on Istio code"
href="https://github.com/istio/community" aria-label="GitHub">
<svg viewBox="0 0 478.165 478.165">
<path d="M349.22,55.768c6.136,14.046,10.241,37.556,4.224,54.69
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c-6.136,0.458-15.361-0.239-14.903,8.408c37.735,3.008,75.092,6.117,105.894,15.779c-30.702-4.981-67.74-12.552-105.894-13.668
c-15.54,30.921-47.239,46.262-90.991,49.49c4.682,10.261,13.847,14.066,15.879,30.702c3.267,24.406-4.881,60.328,3.208,76.686
c4.064,7.89,10.579,8.009,14.863,14.604c-10.699,12.871-37.257-1.395-40.186-14.604c-5.14-22.852,7.89-58.256-6.415-73.737
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c-7.471,0.697-4.204,11.197-4.224,15.76c-0.199,40.106,8.189,94.836-34.846,89.556c-1.315-8.348,5.838-11.217,8.467-19.007
c7.91-22.434-1.454-56.045,2.112-83.161c-16.417,12.512,1.793,55.666-8.428,77.961c-5.838,12.671-24.785,18.27-39.19,12.651
c1.873-9.464,11.695-7.989,15.879-16.875c5.818-12.452,0.02-30.244,2.092-48.494c-30.423,6.097-53.993-0.877-65.608-20.023
c-5.12-8.507-6.356-18.708-12.632-26.219c-6.117-7.551-16.098-8.507-19.087-18.808c37.755-9.185,39.17,38.771,73.06,39.807
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c-38.293,1.893-73.339,7.013-105.894,14.843c29.547-10.679,65.807-14.604,104.778-15.819c-2.351-13.807-22.434-10.022-34.866-9.543
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c12.133,0.677,24.705,6.097,33.731,5.32c8.906-0.877,18.728-10.898,27.534-14.843C326.507,58.099,336.17,56.206,349.22,55.768z"/>
</svg>
</a>
</div>
<div class="icon">
<span>drive</span>
<a title="Access our team drive if you'd like to take a look at the Istio technical design documents"
href="https://groups.google.com/forum/#!forum/istio-team-drive-access" aria-label="team drive">
<svg viewBox="0 0 207.027 207.027">
<path d="M69.866,15.557L0,138.919l28.732,52.552l143.288-0.029l35.008-59.588L136.39,15.735L69.866,15.557z M17.166,139.046
L74.268,38.205L91.21,67.783L33.24,168.447L17.166,139.046z M99.841,82.851l23.805,41.558l-47.732-0.006L99.841,82.851z
M163.434,176.443l-117.332,0.024l21.53-37.065l64.606,0.008l0.067,0.119l52.865-0.085L163.434,176.443z M140.932,124.411
L90.157,35.767l-2.966-5.178l40.751,0.121l57.003,93.706L140.932,124.411z"/>
</svg>
</a>
</div>
<div class="icon">
<span>working groups</span>
<a title="If you'd like to contribute to the Istio project, consider participating in our working groups"
href="https://github.com/istio/community/blob/master/WORKING-GROUPS.md" aria-label="working groups">
<svg viewBox="0 -45 439.833 439.833">
<polygon points="246.048,195.833 299.966,235.085 319.497,227.296 276.278,195.833"/>
<polygon points="193.786,195.833 163.556,195.833 120.33,227.3 139.862,235.089"/>
<path d="M219.927,11.558c-23.854,0-37.057,12.362-36.814,36.182c0.348,32.623,14.211,52.414,36.814,52.068
c0,0,36.802,1.492,36.802-52.068C256.729,23.918,244.294,11.558,219.927,11.558z"/>
<path d="M285.017,124.567l-36.77-14.659l-8.608-7.256c-2.274-1.922-5.636-1.78-7.741,0.317l-11.973,11.904l-12.008-11.907
c-2.109-2.094-5.465-2.229-7.736-0.313l-8.611,7.256l-36.77,14.661c-11.842,4.715-11.83,46.647-12.848,50.497h155.93
C296.866,171.228,296.862,129.28,285.017,124.567z"/>
<path d="M77.976,228.568c0,0,36.801,1.492,36.801-52.068c0-23.82-12.434-36.182-36.801-36.182
c-23.854,0-37.057,12.362-36.814,36.182C41.509,209.124,55.372,228.915,77.976,228.568z"/>
<path d="M143.065,253.329l-36.77-14.658l-8.609-7.256c-2.275-1.923-5.635-1.781-7.742,0.315l-11.971,11.904l-12.008-11.908
c-2.109-2.094-5.465-2.229-7.736-0.312l-8.611,7.256l-36.77,14.66C1.006,258.045,1.018,299.977,0,303.827h155.93
C154.915,299.988,154.911,258.042,143.065,253.329z"/>
<path d="M361.878,228.568c0,0,36.801,1.492,36.801-52.068c0-23.82-12.434-36.182-36.801-36.182
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<path d="M426.968,253.329l-36.77-14.658l-8.609-7.256c-2.273-1.923-5.635-1.781-7.742,0.315l-11.971,11.904l-12.008-11.908
c-2.109-2.094-5.465-2.229-7.736-0.312l-8.61,7.256l-36.771,14.66c-11.842,4.715-11.83,46.646-12.848,50.497h155.93
C438.817,299.988,438.812,258.042,426.968,253.329z"/>
</svg>
</a>
</div>
<div class="icon">
<span>slack</span>
<a title="Interactively discuss development issues with the Istio community on Slack (invitation-only)"
href="https://istio.slack.com" aria-label="slack">
<svg viewBox="0 0 31.444 31.443">
<path d="M31.202,16.369c-0.62-1.388-2.249-2.011-3.637-1.391l-1.325,0.594l-3.396-7.591l1.325-0.592
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c-0.621-1.388-2.249-2.009-3.637-1.388c-1.388,0.62-2.009,2.247-1.389,3.637l0.593,1.325L7.98,8.598L7.388,7.273
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c0.621,1.391,2.248,2.013,3.637,1.392c1.388-0.619,2.01-2.248,1.389-3.637l-0.592-1.324l1.323-0.594
C31.201,19.384,31.823,17.757,31.202,16.369z M13.623,21.215l-3.395-7.593l7.591-3.394l3.395,7.591L13.623,21.215z"/>
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