mirror of https://github.com/istio/istio.io.git
187 lines
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187 lines
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HTML
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services."}); docs.push({path: [ "traffic-management", "faq.md", ], url: "/docs/tasks/traffic-management/faq.html", title: "FAQ", order: 100, overview: "Common issues, known limitations and work arounds, and other frequently asked questions on this topic."}); 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."}); 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>Istio Ingress Controller</h1><p>This task describes how to configure Istio to expose a service outside of the service mesh cluster. In a Kubernetes environment, the <a href="https://kubernetes.io/docs/concepts/services-networking/ingress/">Kubernetes Ingress Resources</a> allows users to specify services that should be exposed outside the cluster. However, the Ingress Resource specification is very minimal, allowing users to specify just hosts, paths and their backing services. To take advantage of Istio’s advanced routing capabilities, we recommend combining a minimal Ingress Resource specification with Istio’s route rules.</p><blockquote><p>Note: Istio does not support <code>ingress.kubernetes.io</code> annotations in the ingress resource specifications. Any annotation other than <code>kubernetes.io/ingress.class: istio</code> will be ignored.</p></blockquote><h2 id="before-you-begin">Before you begin</h2><ul><li><p>Setup Istio by following the instructions in the <a href="/v0.2/docs/setup/">Installation guide</a>.</p></li><li><p>Make sure your current directory is the <code>istio</code> directory.</p></li><li><p>Start the <a href="https://github.com/istio/istio/tree/master/samples/httpbin">httpbin</a> sample, which will be used as the destination service to be exposed externally.</p><p>If you installed the <a href="/v0.2/docs/setup/kubernetes/sidecar-injection.html#automatic-sidecar-injection">Istio-Initializer</a>, do</p><pre><code class="language-bash">kubectl apply -f samples/httpbin/httpbin.yaml
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</code></pre><p>Without the Istio-Initializer:</p><pre><code class="language-bash">kubectl apply -f <(istioctl kube-inject -f samples/httpbin/httpbin.yaml)
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</code></pre></li></ul><h2 id="configuring-ingress-http">Configuring ingress (HTTP)</h2><ol><li><p>Create a basic Ingress Resource for the httpbin service</p><pre><code class="language-bash">cat <<EOF | kubectl create -f -
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apiVersion: extensions/v1beta1
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kind: Ingress
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metadata:
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name: simple-ingress
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annotations:
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kubernetes.io/ingress.class: istio
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spec:
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rules:
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- http:
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paths:
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- path: /.*
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backend:
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serviceName: httpbin
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servicePort: 8000
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EOF
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</code></pre><p><code>/.*</code> is a special Istio notation that is used to indicate a prefix match, specifically a configuration of the form (<code>prefix: /</code>). This configuration above will allow access to all URIs in the httpbin service. However we wish to enable access only to specific URIs under the httpbin service. Let us define a default <em>deny all</em> route rule that provides this behavior:</p><pre><code class="language-bash">cat <<EOF | istioctl create -f -
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## Deny all access from istio-ingress
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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: deny-route
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spec:
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destination:
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name: httpbin
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match:
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# Limit this rule to istio ingress pods only
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source:
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name: istio-ingress
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labels:
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istio: ingress
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precedence: 1
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route:
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- weight: 100
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httpFault:
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abort:
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percent: 100
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httpStatus: 403 #Forbidden for all URLs
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EOF
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</code></pre></li><li><p>Now, allow requests to <code>/status/</code> prefix by defining a route rule of higher priority.</p><pre><code class="language-bash">cat <<EOF | istioctl create -f -
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## Allow requests to /status prefix
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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: status-route
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spec:
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destination:
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name: httpbin
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match:
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# Limit this rule to istio ingress pods only
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source:
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name: istio-ingress
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labels:
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istio: ingress
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request:
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headers:
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uri:
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prefix: /status
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precedence: 2 #must be higher precedence than the deny-route
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route:
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- weight: 100
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EOF
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</code></pre><p>You can use other features of the route rules such as redirects, rewrites, regular expression based match in HTTP headers, websocket upgrades, timeouts, retries, and so on. Please refer to the <a href="/v0.2/docs/reference/config/traffic-rules/routing-rules.html">routing rules</a> for more details.</p></li></ol><h2 id="verifying-ingress">Verifying ingress</h2><ol><li><p>Determine the ingress URL:</p><ul><li><p>If your cluster is running in an environment that supports external load balancers, use the ingress’ external address:</p><pre><code class="language-bash">kubectl get ingress simple-ingress -o wide
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</code></pre><pre><code class="language-bash">NAME HOSTS ADDRESS PORTS AGE
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simple-ingress * 130.211.10.121 80 1d
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</code></pre><pre><code class="language-bash">export INGRESS_HOST=130.211.10.121
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</code></pre></li><li><p>If load balancers are not supported, use the ingress controller pod’s hostIP:</p><pre><code class="language-bash">kubectl -n istio-system get po -l istio=ingress -o jsonpath='{.items[0].status.hostIP}'
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</code></pre><pre><code class="language-bash">169.47.243.100
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</code></pre><p>along with the istio-ingress service’s nodePort for port 80:</p><pre><code class="language-bash">kubectl -n istio-system get svc istio-ingress
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</code></pre><pre><code class="language-bash">NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
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istio-ingress 10.10.10.155 <pending> 80:31486/TCP,443:32254/TCP 32m
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</code></pre><pre><code class="language-bash">export INGRESS_HOST=169.47.243.100:31486
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</code></pre></li></ul></li><li><p>Access the httpbin service using <em>curl</em>:</p><pre><code class="language-bash">curl -I http://$INGRESS_HOST/status/200
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</code></pre><pre><code class="language-bash">HTTP/1.1 200 OK
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Server: meinheld/0.6.1
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Date: Thu, 05 Oct 2017 21:23:17 GMT
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Content-Type: text/html; charset=utf-8
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Access-Control-Allow-Origin: *
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Access-Control-Allow-Credentials: true
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X-Powered-By: Flask
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X-Processed-Time: 0.00105214118958
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Content-Length: 0
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Via: 1.1 vegur
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Connection: Keep-Alive
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</code></pre></li><li><p>Access any other URL that has not been explicitly exposed. You should see a HTTP 403</p><pre><code class="language-bash">curl -I http://$INGRESS_HOST/headers
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</code></pre><pre><code class="language-bash">HTTP/1.1 403 FORBIDDEN
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Server: meinheld/0.6.1
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Date: Thu, 05 Oct 2017 21:24:47 GMT
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Content-Type: text/html; charset=utf-8
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Access-Control-Allow-Origin: *
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Access-Control-Allow-Credentials: true
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X-Powered-By: Flask
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X-Processed-Time: 0.000759840011597
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Content-Length: 0
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Via: 1.1 vegur
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Connection: Keep-Alive
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</code></pre></li></ol><h2 id="configuring-secure-ingress-https">Configuring secure ingress (HTTPS)</h2><ol><li><p>Generate keys if necessary</p><p>A private key and certificate can be created for testing using <a href="https://www.openssl.org/">OpenSSL</a>.</p><pre><code class="language-bash">openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /tmp/tls.key -out /tmp/tls.crt -subj "/CN=foo.bar.com"
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</code></pre></li><li><p>Update the secret using <code>kubectl</code></p><pre><code class="language-bash">kubectl create -n istio-system secret tls istio-ingress-certs --key /tmp/tls.key --cert /tmp/tls.crt
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</code></pre></li><li><p>Create the Ingress Resource for the httpbin service</p><pre><code class="language-bash">cat <<EOF | kubectl create -f -
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apiVersion: extensions/v1beta1
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kind: Ingress
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metadata:
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name: secure-ingress
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annotations:
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kubernetes.io/ingress.class: istio
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spec:
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tls:
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- secretName: istio-ingress-certs # currently ignored
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rules:
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- http:
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paths:
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- path: /.*
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backend:
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serviceName: httpbin
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servicePort: 8000
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EOF
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</code></pre><p>Create the <em>deny rule</em> and the rule for <code>/status</code> prefix as described earlier. Set the INGRESS_HOST to point to the ip address and the port number of the ingress service as shown earlier.</p><blockquote><p>Note: Envoy currently only allows a single TLS secret in the ingress since SNI is not yet supported. That means that the secret name field in ingress resource is not used, and the secret must be called <code>istio-ingress-certs</code> in <code>istio-system</code> namespace.</p></blockquote></li><li><p>Access the secured httpbin service using <em>curl</em>:</p><pre><code class="language-bash">curl -I -k https://$INGRESS_HOST/status/200
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</code></pre></li></ol><h2 id="configuring-ingress-for-grpc">Configuring ingress for gRPC</h2><p>The ingress controller currently doesn’t support <code>.</code> characters in the <code>path</code> field. This is an issue for gRPC services using namespaces. In order to work around the issue, traffic can be directed through a common dummy service, with route rules set up to intercept traffic and redirect to the intended services.</p><ol><li><p>Create a dummy ingress service:</p><pre><code class="language-bash">cat <<EOF | kubectl create -f -
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apiVersion: v1
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kind: Service
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metadata:
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name: ingress-dummy-service
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spec:
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ports:
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- name: grpc
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port: 1337
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EOF
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</code></pre></li><li><p>Create a catch-all ingress pointing to the dummy service:</p><pre><code class="language-bash">cat <<EOF | kubectl create -f -
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apiVersion: extensions/v1beta1
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kind: Ingress
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metadata:
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name: all-istio-ingress
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annotations:
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kubernetes.io/ingress.class: istio
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spec:
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rules:
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- http:
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paths:
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- backend:
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serviceName: ingress-dummy-service
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servicePort: grpc
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EOF
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</code></pre></li><li><p>Create a RouteRule for each service, redirecting from the dummy service to the correct gRPC service:</p><pre><code class="language-bash">cat <<EOF | istioctl create -f -
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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: foo-service-route
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spec:
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destination:
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name: ingress-dummy-service
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match:
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request:
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headers:
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uri:
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prefix: "/foo.FooService"
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precedence: 1
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route:
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- weight: 100
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destination:
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name: foo-service
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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: bar-service-route
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spec:
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destination:
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name: ingress-dummy-service
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match:
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request:
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headers:
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uri:
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prefix: "/bar.BarService"
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precedence: 1
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route:
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- weight: 100
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destination:
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name: bar-service
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EOF
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</code></pre></li></ol><h2 id="understanding-ingresses">Understanding ingresses</h2><p>Ingresses provide gateways for external traffic to enter the Istio service mesh and make the traffic management and policy features of Istio available for edge services.</p><p>In the preceding steps we created a service inside the Istio service mesh and showed how to expose both HTTP and HTTPS endpoints of the service to external traffic. We also showed how to control the ingress traffic using an Istio route rule.</p><h2 id="cleanup">Cleanup</h2><ol><li><p>Remove the secret, Ingress Resource definitions and Istio rule.</p><pre><code class="language-bash">istioctl delete routerule deny-route status-route
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kubectl delete ingress simple-ingress secure-ingress
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kubectl delete -n istio-system secret istio-ingress-certs
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</code></pre></li><li><p>Shutdown the <a href="https://github.com/istio/istio/tree/master/samples/httpbin">httpbin</a> service.</p><pre><code class="language-bash">kubectl delete -f samples/httpbin/httpbin.yaml
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</code></pre></li></ol><h2 id="further-reading">Further reading</h2><ul><li><p>Learn more about <a href="https://kubernetes.io/docs/concepts/services-networking/ingress/">Ingress Resources</a>.</p></li><li><p>Learn more about <a href="/v0.2/docs/concepts/traffic-management/rules-configuration.html">routing rules</a>.</p></li></ul></div></div></div></div></div></div><script src="/v0.2/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="/v0.2/docs/">Welcome</a></li><li><a href="/v0.2/docs/concepts">Concepts</a></li><li><a href="/v0.2/docs/setup">Setup</a></li><li><a href="/v0.2/docs/tasks">Tasks</a></li><li><a href="/v0.2/docs/guides">Guides</a></li><li><a href="/v0.2/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="/v0.2/faq">Frequently Asked Questions</a></li><li><a href="/v0.2/troubleshooting">Troubleshooting Guide</a></li><li><a href="/v0.2/bugs">Report a Bug</a></li><li><a href="https://github.com/istio/istio.github.io/issues/new?title=Issue with _docs/tasks/traffic-management/ingress.md">Report a Doc Issue</a></li><li><a href="https://github.com/istio/istio.github.io/edit/master/_docs/tasks/traffic-management/ingress.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</a> | <a href="https://github.com/istio/istio/blob/master/GROUPS.md#working-groups" target="_blank">Working Group 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"> Istio 0.2, Copyright © 2017 Istio Authors<br> Archived on 12-Nov-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="/v0.2/js/common.js"></script> <script src="/v0.2/js/buttons.js"></script> <script src="/v0.2/js/search.js"></script> <script src="/v0.2/js/prism.js"></script></body></html>
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