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<a href="../auth/oauth-external-auth/" title="External OAUTH Authentication" class="md-nav__link">
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External OAUTH Authentication
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Custom Configuration
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Custom Errors
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Custom Headers
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External authentication
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<a href="../customization/ssl-dh-param/" title="Custom DH parameters for perfect forward secrecy" class="md-nav__link">
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Custom DH parameters for perfect forward secrecy
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</a>
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Step 2: the kubernetes Service
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Step 4: test the connection
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Debugging Hints
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Notes on using response/request streams
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Multi TLS certificate termination
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Static IPs
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TLS termination
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Prerequisites
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Step 4: test the connection
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Debugging Hints
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<h1 id="grpc">gRPC<a class="headerlink" href="#grpc" title="Permanent link"> ¶</a></h1>
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<p>This example demonstrates how to route traffic to a gRPC service through the
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nginx controller.</p>
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<h2 id="prerequisites">Prerequisites<a class="headerlink" href="#prerequisites" title="Permanent link"> ¶</a></h2>
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<ol>
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<li>You have a kubernetes cluster running.</li>
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<li>You have a domain name such as <code>example.com</code> that is configured to route
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traffic to the ingress controller. Replace references to
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<code>fortune-teller.stack.build</code> (the domain name used in this example) to your
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own domain name (you're also responsible for provisioning an SSL certificate
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for the ingress).</li>
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<li>You have the nginx-ingress controller installed in typical fashion (must be
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at least
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<a href="https://quay.io/kubernetes-ingress-controller/nginx-ingress-controller">quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.30.0</a>
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for grpc support.</li>
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<li>You have a backend application running a gRPC server and listening for TCP
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traffic. If you prefer, you can use the
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<a href="https://github.com/kubernetes/ingress-nginx/tree/master/images/grpc-fortune-teller">fortune-teller</a>
|
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application provided here as an example.</li>
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</ol>
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<h3 id="step-1-kubernetes-deployment">Step 1: kubernetes <code>Deployment</code><a class="headerlink" href="#step-1-kubernetes-deployment" title="Permanent link"> ¶</a></h3>
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<div class="highlight"><pre><span></span><code>$ kubectl create -f app.yaml
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</code></pre></div>
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<p>This is a standard kubernetes deployment object. It is running a grpc service
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listening on port <code>50051</code>.</p>
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<p>The sample application
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|
<a href="https://github.com/kubernetes/ingress-nginx/tree/master/images/grpc-fortune-teller">fortune-teller-app</a>
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is a grpc server implemented in go. Here's the stripped-down implementation:</p>
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<div class="highlight"><pre><span></span><code><span class="kd">func</span> <span class="nx">main</span><span class="p">()</span> <span class="p">{</span>
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<span class="nx">grpcServer</span> <span class="o">:=</span> <span class="nx">grpc</span><span class="p">.</span><span class="nx">NewServer</span><span class="p">()</span>
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<span class="nx">fortune</span><span class="p">.</span><span class="nx">RegisterFortuneTellerServer</span><span class="p">(</span><span class="nx">grpcServer</span><span class="p">,</span> <span class="o">&</span><span class="nx">FortuneTeller</span><span class="p">{})</span>
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<span class="nx">lis</span><span class="p">,</span> <span class="nx">_</span> <span class="o">:=</span> <span class="nx">net</span><span class="p">.</span><span class="nx">Listen</span><span class="p">(</span><span class="s">"tcp"</span><span class="p">,</span> <span class="s">":50051"</span><span class="p">)</span>
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<span class="nx">grpcServer</span><span class="p">.</span><span class="nx">Serve</span><span class="p">(</span><span class="nx">lis</span><span class="p">)</span>
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<span class="p">}</span>
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</code></pre></div>
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<p>The takeaway is that we are not doing any TLS configuration on the server (as we
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|
are terminating TLS at the ingress level, grpc traffic will travel unencrypted
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inside the cluster and arrive "insecure").</p>
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<p>For your own application you may or may not want to do this. If you prefer to
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|
forward encrypted traffic to your POD and terminate TLS at the gRPC server
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|
itself, add the ingress annotation <code>nginx.ingress.kubernetes.io/backend-protocol: "GRPCS"</code>.</p>
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<h3 id="step-2-the-kubernetes-service">Step 2: the kubernetes <code>Service</code><a class="headerlink" href="#step-2-the-kubernetes-service" title="Permanent link"> ¶</a></h3>
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<div class="highlight"><pre><span></span><code>$ kubectl create -f svc.yaml
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</code></pre></div>
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<p>Here we have a typical service. Nothing special, just routing traffic to the
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backend application on port <code>50051</code>.</p>
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<h3 id="step-3-the-kubernetes-ingress">Step 3: the kubernetes <code>Ingress</code><a class="headerlink" href="#step-3-the-kubernetes-ingress" title="Permanent link"> ¶</a></h3>
|
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<div class="highlight"><pre><span></span><code>$ kubectl create -f ingress.yaml
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</code></pre></div>
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<p>A few things to note:</p>
|
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<ol>
|
|
<li>We've tagged the ingress with the annotation
|
|
<code>nginx.ingress.kubernetes.io/backend-protocol: "GRPC"</code>. This is the magic
|
|
ingredient that sets up the appropriate nginx configuration to route http/2
|
|
traffic to our service.</li>
|
|
<li>We're terminating TLS at the ingress and have configured an SSL certificate
|
|
<code>fortune-teller.stack.build</code>. The ingress matches traffic arriving as
|
|
<code>https://fortune-teller.stack.build:443</code> and routes unencrypted messages to
|
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our kubernetes service.</li>
|
|
</ol>
|
|
<h3 id="step-4-test-the-connection">Step 4: test the connection<a class="headerlink" href="#step-4-test-the-connection" title="Permanent link"> ¶</a></h3>
|
|
<p>Once we've applied our configuration to kubernetes, it's time to test that we
|
|
can actually talk to the backend. To do this, we'll use the
|
|
<a href="https://github.com/fullstorydev/grpcurl">grpcurl</a> utility:</p>
|
|
<div class="highlight"><pre><span></span><code>$ grpcurl fortune-teller.stack.build:443 build.stack.fortune.FortuneTeller/Predict
|
|
<span class="o">{</span>
|
|
<span class="s2">"message"</span>: <span class="s2">"Let us endeavor so to live that when we come to die even the undertaker will be sorry.\n\t\t-- Mark Twain, \"Pudd'nhead Wilson's Calendar\""</span>
|
|
<span class="o">}</span>
|
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</code></pre></div>
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|
|
<h3 id="debugging-hints">Debugging Hints<a class="headerlink" href="#debugging-hints" title="Permanent link"> ¶</a></h3>
|
|
<ol>
|
|
<li>Obviously, watch the logs on your app.</li>
|
|
<li>Watch the logs for the nginx-ingress-controller (increasing verbosity as
|
|
needed).</li>
|
|
<li>Double-check your address and ports.</li>
|
|
<li>Set the <code>GODEBUG=http2debug=2</code> environment variable to get detailed http/2
|
|
logging on the client and/or server.</li>
|
|
<li>Study RFC 7540 (http/2) <a href="https://tools.ietf.org/html/rfc7540">https://tools.ietf.org/html/rfc7540</a>.</li>
|
|
</ol>
|
|
<blockquote>
|
|
<p>If you are developing public gRPC endpoints, check out
|
|
https://proto.stack.build, a protocol buffer / gRPC build service that can use
|
|
to help make it easier for your users to consume your API.</p>
|
|
<p>See also the specific GRPC settings of NGINX: https://nginx.org/en/docs/http/ngx_http_grpc_module.html</p>
|
|
</blockquote>
|
|
<h3 id="notes-on-using-responserequest-streams">Notes on using response/request streams<a class="headerlink" href="#notes-on-using-responserequest-streams" title="Permanent link"> ¶</a></h3>
|
|
<ol>
|
|
<li>If your server does only response streaming and you expect a stream to be open longer than 60 seconds, you will have to change the <code>grpc_read_timeout</code> to acommodate for this.</li>
|
|
<li>If your service does only request streaming and you expect a stream to be open longer than 60 seconds, you have to change the
|
|
<code>grpc_send_timeout</code> and the <code>client_body_timeout</code>.</li>
|
|
<li>If you do both response and request streaming with an open stream longer than 60 seconds, you have to change all three timeouts: <code>grpc_read_timeout</code>, <code>grpc_send_timeout</code> and <code>client_body_timeout</code>.</li>
|
|
</ol>
|
|
<p>Values for the timeouts must be specified as e.g. <code>"1200s"</code>.</p>
|
|
<blockquote>
|
|
<p>On the most recent versions of nginx-ingress, changing these timeouts requires using the <code>nginx.ingress.kubernetes.io/server-snippet</code> annotation. There are plans for future releases to allow using the Kubernetes annotations to define each timeout seperately.</p>
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</blockquote>
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