ingress-nginx-helm/user-guide/third-party-addons/opentracing/index.html
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<h1 id="opentracing">OpenTracing<a class="headerlink" href="#opentracing" title="Permanent link"></a></h1>
<p>Enables requests served by NGINX for distributed tracing via The OpenTracing Project.</p>
<p>Using the third party module <a href="https://github.com/opentracing-contrib/nginx-opentracing">opentracing-contrib/nginx-opentracing</a> the NGINX ingress controller can configure NGINX to enable <a href="http://opentracing.io">OpenTracing</a> instrumentation.
By default this feature is disabled.</p>
<h2 id="usage">Usage<a class="headerlink" href="#usage" title="Permanent link"></a></h2>
<p>To enable the instrumentation we must enable OpenTracing in the configuration ConfigMap:
<div class="codehilite"><pre><span></span><code><span class="n">data</span><span class="o">:</span>
<span class="n">enable</span><span class="o">-</span><span class="n">opentracing</span><span class="o">:</span> <span class="s2">&quot;true&quot;</span>
</code></pre></div></p>
<p>To enable or disable instrumentation for a single Ingress, use
the <code class="codehilite"><span class="err">enable-opentracing</span></code> annotation:
<div class="codehilite"><pre><span></span><code><span class="n">kind</span><span class="o">:</span> <span class="n">Ingress</span>
<span class="n">metadata</span><span class="o">:</span>
<span class="n">annotations</span><span class="o">:</span>
<span class="n">nginx</span><span class="o">.</span><span class="na">ingress</span><span class="o">.</span><span class="na">kubernetes</span><span class="o">.</span><span class="na">io</span><span class="o">/</span><span class="n">enable</span><span class="o">-</span><span class="n">opentracing</span><span class="o">:</span> <span class="s2">&quot;true&quot;</span>
</code></pre></div></p>
<p>We must also set the host to use when uploading traces:</p>
<p><div class="codehilite"><pre><span></span><code><span class="c">zipkin-collector-host: zipkin.default.svc.cluster.local</span>
<span class="c">jaeger-collector-host: jaeger-agent.default.svc.cluster.local</span>
<span class="c">datadog-collector-host: datadog-agent.default.svc.cluster.local</span>
</code></pre></div>
NOTE: While the option is called <code class="codehilite"><span class="err">jaeger-collector-host</span></code>, you will need to point this to a <code class="codehilite"><span class="err">jaeger-agent</span></code>, and not the <code class="codehilite"><span class="err">jaeger-collector</span></code> component.</p>
<p>Next you will need to deploy a distributed tracing system which uses OpenTracing.
<a href="https://github.com/openzipkin/zipkin">Zipkin</a> and
<a href="https://github.com/jaegertracing/jaeger">Jaeger</a> and
<a href="https://github.com/DataDog/dd-opentracing-cpp">Datadog</a>
have been tested.</p>
<p>Other optional configuration options:
<div class="codehilite"><pre><span></span><code><span class="o">#</span> <span class="n">specifies</span> <span class="n">the</span> <span class="n">port</span> <span class="k">to</span> <span class="n">use</span> <span class="k">when</span> <span class="n">uploading</span> <span class="n">traces</span><span class="p">,</span> <span class="k">Default</span><span class="p">:</span> <span class="mi">9411</span>
<span class="n">zipkin</span><span class="o">-</span><span class="n">collector</span><span class="o">-</span><span class="n">port</span>
<span class="o">#</span> <span class="n">specifies</span> <span class="n">the</span> <span class="n">service</span> <span class="n">name</span> <span class="k">to</span> <span class="n">use</span> <span class="k">for</span> <span class="k">any</span> <span class="n">traces</span> <span class="n">created</span><span class="p">,</span> <span class="k">Default</span><span class="p">:</span> <span class="n">nginx</span>
<span class="n">zipkin</span><span class="o">-</span><span class="n">service</span><span class="o">-</span><span class="n">name</span>
<span class="o">#</span> <span class="n">specifies</span> <span class="n">sample</span> <span class="n">rate</span> <span class="k">for</span> <span class="k">any</span> <span class="n">traces</span> <span class="n">created</span><span class="p">,</span> <span class="k">Default</span><span class="p">:</span> <span class="mi">1</span><span class="p">.</span><span class="mi">0</span>
<span class="n">zipkin</span><span class="o">-</span><span class="n">sample</span><span class="o">-</span><span class="n">rate</span>
<span class="o">#</span> <span class="n">specifies</span> <span class="n">the</span> <span class="n">port</span> <span class="k">to</span> <span class="n">use</span> <span class="k">when</span> <span class="n">uploading</span> <span class="n">traces</span><span class="p">,</span> <span class="k">Default</span><span class="p">:</span> <span class="mi">6831</span>
<span class="n">jaeger</span><span class="o">-</span><span class="n">collector</span><span class="o">-</span><span class="n">port</span>
<span class="o">#</span> <span class="n">specifies</span> <span class="n">the</span> <span class="n">service</span> <span class="n">name</span> <span class="k">to</span> <span class="n">use</span> <span class="k">for</span> <span class="k">any</span> <span class="n">traces</span> <span class="n">created</span><span class="p">,</span> <span class="k">Default</span><span class="p">:</span> <span class="n">nginx</span>
<span class="n">jaeger</span><span class="o">-</span><span class="n">service</span><span class="o">-</span><span class="n">name</span>
<span class="o">#</span> <span class="n">specifies</span> <span class="n">the</span> <span class="n">sampler</span> <span class="k">to</span> <span class="n">be</span> <span class="n">used</span> <span class="k">when</span> <span class="n">sampling</span> <span class="n">traces</span><span class="p">.</span>
<span class="o">#</span> <span class="n">The</span> <span class="n">available</span> <span class="n">samplers</span> <span class="k">are</span><span class="p">:</span> <span class="n">const</span><span class="p">,</span> <span class="n">probabilistic</span><span class="p">,</span> <span class="n">ratelimiting</span><span class="p">,</span> <span class="n">remote</span><span class="p">,</span> <span class="k">Default</span><span class="p">:</span> <span class="n">const</span>
<span class="n">jaeger</span><span class="o">-</span><span class="n">sampler</span><span class="o">-</span><span class="k">type</span>
<span class="o">#</span> <span class="n">specifies</span> <span class="n">the</span> <span class="n">argument</span> <span class="k">to</span> <span class="n">be</span> <span class="n">passed</span> <span class="k">to</span> <span class="n">the</span> <span class="n">sampler</span> <span class="k">constructor</span><span class="p">,</span> <span class="k">Default</span><span class="p">:</span> <span class="mi">1</span>
<span class="n">jaeger</span><span class="o">-</span><span class="n">sampler</span><span class="o">-</span><span class="n">param</span>
<span class="o">#</span> <span class="n">Specifies</span> <span class="n">the</span> <span class="n">custom</span> <span class="n">remote</span> <span class="n">sampler</span> <span class="k">host</span> <span class="k">to</span> <span class="n">be</span> <span class="n">passed</span> <span class="k">to</span> <span class="n">the</span> <span class="n">sampler</span> <span class="k">constructor</span><span class="p">.</span> <span class="n">Must</span> <span class="n">be</span> <span class="n">a</span> <span class="k">valid</span> <span class="n">URL</span><span class="p">.</span>
<span class="o">#</span> <span class="k">Default</span><span class="p">:</span> <span class="n">http</span><span class="p">:</span><span class="o">//</span><span class="mi">127</span><span class="p">.</span><span class="mi">0</span><span class="p">.</span><span class="mi">0</span><span class="p">.</span><span class="mi">1</span>
<span class="n">jaeger</span><span class="o">-</span><span class="n">sampler</span><span class="o">-</span><span class="k">host</span>
<span class="o">#</span> <span class="n">Specifies</span> <span class="n">the</span> <span class="n">custom</span> <span class="n">remote</span> <span class="n">sampler</span> <span class="n">port</span> <span class="k">to</span> <span class="n">be</span> <span class="n">passed</span> <span class="k">to</span> <span class="n">the</span> <span class="n">sampler</span> <span class="k">constructor</span><span class="p">.</span> <span class="n">Must</span> <span class="n">be</span> <span class="n">a</span> <span class="nb">number</span><span class="p">.</span> <span class="k">Default</span><span class="p">:</span> <span class="mi">5778</span>
<span class="n">jaeger</span><span class="o">-</span><span class="n">sampler</span><span class="o">-</span><span class="n">port</span>
<span class="o">#</span> <span class="n">Specifies</span> <span class="n">the</span> <span class="n">header</span> <span class="n">name</span> <span class="n">used</span> <span class="k">for</span> <span class="n">passing</span> <span class="n">trace</span> <span class="n">context</span><span class="p">.</span> <span class="n">Must</span> <span class="n">be</span> <span class="n">a</span> <span class="n">string</span><span class="p">.</span> <span class="k">Default</span><span class="p">:</span> <span class="n">uber</span><span class="o">-</span><span class="n">trace</span><span class="o">-</span><span class="n">id</span>
<span class="n">jaeger</span><span class="o">-</span><span class="n">trace</span><span class="o">-</span><span class="n">context</span><span class="o">-</span><span class="n">header</span><span class="o">-</span><span class="n">name</span>
<span class="o">#</span> <span class="n">Specifies</span> <span class="n">the</span> <span class="n">header</span> <span class="n">name</span> <span class="n">used</span> <span class="k">for</span> <span class="k">force</span> <span class="n">sampling</span><span class="p">.</span> <span class="n">Must</span> <span class="n">be</span> <span class="n">a</span> <span class="n">string</span><span class="p">.</span> <span class="k">Default</span><span class="p">:</span> <span class="n">jaeger</span><span class="o">-</span><span class="n">debug</span><span class="o">-</span><span class="n">id</span>
<span class="n">jaeger</span><span class="o">-</span><span class="n">debug</span><span class="o">-</span><span class="n">header</span>
<span class="o">#</span> <span class="n">Specifies</span> <span class="n">the</span> <span class="n">header</span> <span class="n">name</span> <span class="n">used</span> <span class="k">to</span> <span class="n">submit</span> <span class="n">baggage</span> <span class="k">if</span> <span class="n">there</span> <span class="k">is</span> <span class="k">no</span> <span class="n">root</span> <span class="n">span</span><span class="p">.</span> <span class="n">Must</span> <span class="n">be</span> <span class="n">a</span> <span class="n">string</span><span class="p">.</span> <span class="k">Default</span><span class="p">:</span> <span class="n">jaeger</span><span class="o">-</span><span class="n">baggage</span>
<span class="n">jaeger</span><span class="o">-</span><span class="n">baggage</span><span class="o">-</span><span class="n">header</span>
<span class="o">#</span> <span class="n">Specifies</span> <span class="n">the</span> <span class="n">header</span> <span class="k">prefix</span> <span class="n">used</span> <span class="k">to</span> <span class="n">propagate</span> <span class="n">baggage</span><span class="p">.</span> <span class="n">Must</span> <span class="n">be</span> <span class="n">a</span> <span class="n">string</span><span class="p">.</span> <span class="k">Default</span><span class="p">:</span> <span class="n">uberctx</span><span class="o">-</span>
<span class="n">jaeger</span><span class="o">-</span><span class="n">tracer</span><span class="o">-</span><span class="n">baggage</span><span class="o">-</span><span class="n">header</span><span class="o">-</span><span class="k">prefix</span>
<span class="o">#</span> <span class="n">specifies</span> <span class="n">the</span> <span class="n">port</span> <span class="k">to</span> <span class="n">use</span> <span class="k">when</span> <span class="n">uploading</span> <span class="n">traces</span><span class="p">,</span> <span class="k">Default</span> <span class="mi">8126</span>
<span class="n">datadog</span><span class="o">-</span><span class="n">collector</span><span class="o">-</span><span class="n">port</span>
<span class="o">#</span> <span class="n">specifies</span> <span class="n">the</span> <span class="n">service</span> <span class="n">name</span> <span class="k">to</span> <span class="n">use</span> <span class="k">for</span> <span class="k">any</span> <span class="n">traces</span> <span class="n">created</span><span class="p">,</span> <span class="k">Default</span><span class="p">:</span> <span class="n">nginx</span>
<span class="n">datadog</span><span class="o">-</span><span class="n">service</span><span class="o">-</span><span class="n">name</span>
<span class="o">#</span> <span class="n">specifies</span> <span class="n">the</span> <span class="k">operation</span> <span class="n">name</span> <span class="k">to</span> <span class="n">use</span> <span class="k">for</span> <span class="k">any</span> <span class="n">traces</span> <span class="n">collected</span><span class="p">,</span> <span class="k">Default</span><span class="p">:</span> <span class="n">nginx</span><span class="p">.</span><span class="n">handle</span>
<span class="n">datadog</span><span class="o">-</span><span class="k">operation</span><span class="o">-</span><span class="n">name</span><span class="o">-</span><span class="n">override</span>
<span class="o">#</span> <span class="n">Specifies</span> <span class="k">to</span> <span class="n">use</span> <span class="n">client</span><span class="o">-</span><span class="n">side</span> <span class="n">sampling</span> <span class="k">for</span> <span class="n">distributed</span> <span class="n">priority</span> <span class="n">sampling</span> <span class="k">and</span> <span class="k">ignore</span> <span class="n">sample</span> <span class="n">rate</span><span class="p">,</span> <span class="k">Default</span><span class="p">:</span> <span class="k">true</span>
<span class="n">datadog</span><span class="o">-</span><span class="n">priority</span><span class="o">-</span><span class="n">sampling</span>
<span class="o">#</span> <span class="n">specifies</span> <span class="n">sample</span> <span class="n">rate</span> <span class="k">for</span> <span class="k">any</span> <span class="n">traces</span> <span class="n">created</span><span class="p">,</span> <span class="k">Default</span><span class="p">:</span> <span class="mi">1</span><span class="p">.</span><span class="mi">0</span>
<span class="n">datadog</span><span class="o">-</span><span class="n">sample</span><span class="o">-</span><span class="n">rate</span>
</code></pre></div></p>
<p>All these options (including host) allow environment variables, such as <code class="codehilite"><span class="err">$HOSTNAME</span></code> or <code class="codehilite"><span class="err">$HOST_IP</span></code>. In the case of Jaeger, if you have a Jaeger agent running on each machine in your cluster, you can use something like <code class="codehilite"><span class="err">$HOST_IP</span></code> (which can be 'mounted' with the <code class="codehilite"><span class="err">status.hostIP</span></code> fieldpath, as described <a href="https://kubernetes.io/docs/tasks/inject-data-application/downward-api-volume-expose-pod-information/#capabilities-of-the-downward-api">here</a>) to make sure traces will be sent to the local agent.</p>
<h2 id="examples">Examples<a class="headerlink" href="#examples" title="Permanent link"></a></h2>
<p>The following examples show how to deploy and test different distributed tracing systems. These example can be performed using Minikube.</p>
<h3 id="zipkin">Zipkin<a class="headerlink" href="#zipkin" title="Permanent link"></a></h3>
<p>In the <a href="https://github.com/rnburn/zipkin-date-server">rnburn/zipkin-date-server</a>
GitHub repository is an example of a dockerized date service. To install the example and Zipkin collector run:</p>
<div class="codehilite"><pre><span></span><code><span class="err">kubectl create -f https://raw.githubusercontent.com/rnburn/zipkin-date-server/master/kubernetes/zipkin.yaml</span>
<span class="err">kubectl create -f https://raw.githubusercontent.com/rnburn/zipkin-date-server/master/kubernetes/deployment.yaml</span>
</code></pre></div>
<p>Also we need to configure the NGINX controller ConfigMap with the required values:</p>
<div class="codehilite"><pre><span></span><code>$ <span class="nb">echo</span> <span class="s1">&#39;</span>
<span class="s1">apiVersion: v1</span>
<span class="s1">kind: ConfigMap</span>
<span class="s1">data:</span>
<span class="s1"> enable-opentracing: &quot;true&quot;</span>
<span class="s1"> zipkin-collector-host: zipkin.default.svc.cluster.local</span>
<span class="s1">metadata:</span>
<span class="s1"> name: nginx-configuration</span>
<span class="s1"> namespace: kube-system</span>
<span class="s1">&#39;</span> <span class="p">|</span> kubectl replace -f -
</code></pre></div>
<p>In the Zipkin interface we can see the details:
<img alt="zipkin screenshot" src="../../../images/zipkin-demo.png" title="zipkin collector screenshot" /></p>
<h3 id="jaeger">Jaeger<a class="headerlink" href="#jaeger" title="Permanent link"></a></h3>
<ol>
<li>
<p>Enable Ingress addon in Minikube:
<div class="codehilite"><pre><span></span><code>$ minikube addons <span class="nb">enable</span> ingress
</code></pre></div></p>
</li>
<li>
<p>Add Minikube IP to /etc/hosts:
<div class="codehilite"><pre><span></span><code>$ <span class="nb">echo</span> <span class="s2">&quot;</span><span class="k">$(</span>minikube ip<span class="k">)</span><span class="s2"> example.com&quot;</span> <span class="p">|</span> sudo tee -a /etc/hosts
</code></pre></div></p>
</li>
<li>
<p>Apply a basic Service and Ingress Resource:
<div class="codehilite"><pre><span></span><code><span class="o">#</span> <span class="k">Create</span> <span class="n">Echoheaders</span> <span class="n">Deployment</span>
<span class="err">$</span> <span class="n">kubectl</span> <span class="n">run</span> <span class="n">echoheaders</span> <span class="c1">--image=k8s.gcr.io/echoserver:1.4 --replicas=1 --port=8080</span>
<span class="o">#</span> <span class="n">Expose</span> <span class="k">as</span> <span class="n">a</span> <span class="k">Cluster</span><span class="o">-</span><span class="n">IP</span>
<span class="err">$</span> <span class="n">kubectl</span> <span class="n">expose</span> <span class="n">deployment</span> <span class="n">echoheaders</span> <span class="c1">--port=80 --target-port=8080 --name=echoheaders-x</span>
<span class="o">#</span> <span class="n">Apply</span> <span class="n">the</span> <span class="n">Ingress</span> <span class="n">Resource</span>
<span class="err">$</span> <span class="n">echo</span> <span class="s1">&#39;</span>
<span class="s1"> apiVersion: networking.k8s.io/v1beta1</span>
<span class="s1"> kind: Ingress</span>
<span class="s1"> metadata:</span>
<span class="s1"> name: echo-ingress</span>
<span class="s1"> spec:</span>
<span class="s1"> rules:</span>
<span class="s1"> - host: example.com</span>
<span class="s1"> http:</span>
<span class="s1"> paths:</span>
<span class="s1"> - backend:</span>
<span class="s1"> serviceName: echoheaders-x</span>
<span class="s1"> servicePort: 80</span>
<span class="s1"> path: /echo</span>
<span class="s1"> &#39;</span> <span class="o">|</span> <span class="n">kubectl</span> <span class="n">apply</span> <span class="o">-</span><span class="n">f</span> <span class="o">-</span>
</code></pre></div></p>
</li>
<li>
<p>Enable OpenTracing and set the jaeger-collector-host:
<div class="codehilite"><pre><span></span><code>$ <span class="nb">echo</span> <span class="s1">&#39;</span>
<span class="s1"> apiVersion: v1</span>
<span class="s1"> kind: ConfigMap</span>
<span class="s1"> data:</span>
<span class="s1"> enable-opentracing: &quot;true&quot;</span>
<span class="s1"> jaeger-collector-host: jaeger-agent.default.svc.cluster.local</span>
<span class="s1"> metadata:</span>
<span class="s1"> name: nginx-configuration</span>
<span class="s1"> namespace: kube-system</span>
<span class="s1"> &#39;</span> <span class="p">|</span> kubectl replace -f -
</code></pre></div></p>
</li>
<li>
<p>Apply the Jaeger All-In-One Template:
<div class="codehilite"><pre><span></span><code>$ kubectl apply -f https://raw.githubusercontent.com/jaegertracing/jaeger-kubernetes/master/all-in-one/jaeger-all-in-one-template.yml
</code></pre></div></p>
</li>
<li>
<p>Make a few requests to the Service:
<div class="codehilite"><pre><span></span><code>$ curl example.com/echo -d <span class="s2">&quot;meow&quot;</span>
CLIENT VALUES:
<span class="nv">client_address</span><span class="o">=</span><span class="m">172</span>.17.0.5
<span class="nv">command</span><span class="o">=</span>POST
real <span class="nv">path</span><span class="o">=</span>/echo
<span class="nv">query</span><span class="o">=</span>nil
<span class="nv">request_version</span><span class="o">=</span><span class="m">1</span>.1
<span class="nv">request_uri</span><span class="o">=</span>http://example.com:8080/echo
SERVER VALUES:
<span class="nv">server_version</span><span class="o">=</span>nginx: <span class="m">1</span>.10.0 - lua: <span class="m">10001</span>
HEADERS RECEIVED:
<span class="nv">accept</span><span class="o">=</span>*/*
<span class="nv">connection</span><span class="o">=</span>close
content-length<span class="o">=</span><span class="m">4</span>
content-type<span class="o">=</span>application/x-www-form-urlencoded
<span class="nv">host</span><span class="o">=</span>example.com
user-agent<span class="o">=</span>curl/7.54.0
x-forwarded-for<span class="o">=</span><span class="m">192</span>.168.99.1
x-forwarded-host<span class="o">=</span>example.com
x-forwarded-port<span class="o">=</span><span class="m">80</span>
x-forwarded-proto<span class="o">=</span>http
x-original-uri<span class="o">=</span>/echo
x-real-ip<span class="o">=</span><span class="m">192</span>.168.99.1
x-scheme<span class="o">=</span>http
BODY:
meow
</code></pre></div></p>
</li>
<li>
<p>View the Jaeger UI:
<div class="codehilite"><pre><span></span><code>$ minikube service jaeger-query --url
http://192.168.99.100:30183
</code></pre></div></p>
<p>In the Jaeger interface we can see the details:
<img alt="jaeger screenshot" src="../../../images/jaeger-demo.png" title="jaeger collector screenshot" /></p>
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