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<a href="https://github.com/kubernetes/ingress-nginx/edit/master/docs/user-guide/third-party-addons/opentracing.md" title="Edit this page" class="md-icon md-content__icon">&#xE3C9;</a>
<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><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>
</pre></div></p>
<p>We must also set the host to use when uploading traces:</p>
<p><div class="codehilite"><pre><span></span>zipkin-collector-host: zipkin.default.svc.cluster.local
jaeger-collector-host: jaeger-agent.default.svc.cluster.local
datadog-collector-host: datadog-agent.default.svc.cluster.local
</pre></div>
NOTE: While the option is called <code class="codehilite">jaeger-collector-host</code>, you will need to point this to a <code class="codehilite">jaeger-agent</code>, and not the <code class="codehilite">jaeger-collector</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># specifies the port to use when uploading traces, Default: 9411
zipkin-collector-port
# specifies the service name to use for any traces created, Default: nginx
zipkin-service-name
# specifies sample rate for any traces created, Default: 1.0
zipkin-sample-rate
# specifies the port to use when uploading traces, Default: 6831
jaeger-collector-port
# specifies the service name to use for any traces created, Default: nginx
jaeger-service-name
# specifies the sampler to be used when sampling traces.
# The available samplers are: const, probabilistic, ratelimiting, remote, Default: const
jaeger-sampler-type
# specifies the argument to be passed to the sampler constructor, Default: 1
jaeger-sampler-param
# Specifies the custom remote sampler host to be passed to the sampler constructor. Must be a valid URL.
# Default: http://127.0.0.1
jaeger-sampler-host
# Specifies the custom remote sampler port to be passed to the sampler constructor. Must be a number. Default: 5778
jaeger-sampler-port
# Specifies the header name used for passing trace context. Must be a string. Default: uber-trace-id
jaeger-trace-context-header-name
# Specifies the header name used for force sampling. Must be a string. Default: jaeger-debug-id
jaeger-debug-header
# Specifies the header name used to submit baggage if there is no root span. Must be a string. Default: jaeger-baggage
jaeger-baggage-header
# Specifies the header prefix used to propagate baggage. Must be a string. Default: uberctx-
jaeger-tracer-baggage-header-prefix
# specifies the port to use when uploading traces, Default 8126
datadog-collector-port
# specifies the service name to use for any traces created, Default: nginx
datadog-service-name
# specifies the operation name to use for any traces collected, Default: nginx.handle
datadog-operation-name-override
</pre></div></p>
<p>All these options (including host) allow environment variables, such as <code class="codehilite">$HOSTNAME</code> or <code class="codehilite">$HOST_IP</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">$HOST_IP</code> (which can be 'mounted' with the <code class="codehilite">status.hostIP</code> fieldpath, as described <a href="https://kubernetes.io/docs/tasks/inject-data-application/downward-api-volume-expose-pod-information/#capabilities-of-the-downward-api">here</a>) to make sure traces will be sent to the local agent.</p>
<h2 id="examples">Examples<a class="headerlink" href="#examples" title="Permanent link"></a></h2>
<p>The following examples show how to deploy and test different distributed tracing systems. These example can be performed
using Minikube.</p>
<h3 id="zipkin">Zipkin<a class="headerlink" href="#zipkin" title="Permanent link"></a></h3>
<p>In the <a href="https://github.com/rnburn/zipkin-date-server">rnburn/zipkin-date-server</a>
GitHub repository is an example of a dockerized date service. To install the example and Zipkin collector run:</p>
<div class="codehilite"><pre><span></span>kubectl create -f https://raw.githubusercontent.com/rnburn/zipkin-date-server/master/kubernetes/zipkin.yaml
kubectl create -f https://raw.githubusercontent.com/rnburn/zipkin-date-server/master/kubernetes/deployment.yaml
</pre></div>
<p>Also we need to configure the NGINX controller ConfigMap with the required values:</p>
<div class="codehilite"><pre><span></span>$ <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 -
</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>$ minikube addons <span class="nb">enable</span> ingress
</pre></div></p>
</li>
<li>
<p>Add Minikube IP to /etc/hosts:
<div class="codehilite"><pre><span></span>$ <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
</pre></div></p>
</li>
<li>
<p>Apply a basic Service and Ingress Resource:
<div class="codehilite"><pre><span></span># Create Echoheaders Deployment
$ kubectl run echoheaders --image=k8s.gcr.io/echoserver:1.4 --replicas=1 --port=8080
# Expose as a Cluster-IP
$ kubectl expose deployment echoheaders --port=80 --target-port=8080 --name=echoheaders-x
# Apply the Ingress Resource
$ echo &#39;
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: echo-ingress
spec:
rules:
- host: example.com
http:
paths:
- backend:
serviceName: echoheaders-x
servicePort: 80
path: /echo
&#39; | kubectl apply -f -
</pre></div></p>
</li>
<li>
<p>Enable OpenTracing and set the jaeger-collector-host:
<div class="codehilite"><pre><span></span>$ <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 -
</pre></div></p>
</li>
<li>
<p>Apply the Jaeger All-In-One Template:
<div class="codehilite"><pre><span></span>$ kubectl apply -f https://raw.githubusercontent.com/jaegertracing/jaeger-kubernetes/master/all-in-one/jaeger-all-in-one-template.yml
</pre></div></p>
</li>
<li>
<p>Make a few requests to the Service:
<div class="codehilite"><pre><span></span>$ 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
</pre></div></p>
</li>
<li>
<p>View the Jaeger UI:
<div class="codehilite"><pre><span></span>$ minikube service jaeger-query --url
http://192.168.99.100:30183
</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>
</li>
</ol>
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