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#######
Tracing
#######
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Installation
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Currently, we use the Jaeger tracing all-in-one Kubernetes template for development and testing,
which uses in-memory storage. It can be deployed to the istio-system namespace with the
following command::
kubectl apply -n istio-system -f https://raw.githubusercontent.com/jaegertracing/jaeger-kubernetes/master/all-in-one/jaeger-all-in-one-template.yml
The standard Jaeger REST port is at 16686. To make this service available outside of the
Kubernetes cluster via any node IP in the cluster, use the following command::
kubectl expose -n istio-system deployment jaeger-deployment --port=16686 --type=NodePort
Kubernetes will expose the Jaeger service on another port from 30000-32767 and the assignment can
be found with::
kubectl get svc -n istio-system
An example listing from the command above is shown below where the Jaeger service is exposed
externally on port 30888 in this case::
istio-system jaeger-deployment NodePort 10.104.113.94 <none> 16686:30888/TCP
Jaeger will be accessible using the host IP of any node in Kubernetes cluster and port provided.
With this method, the Jaeger UI will also be available from a remote host. If external access is
required to Jaeger but restricted to cluster localhost(s), an alternate method is to use the
**port-forward** command in the foreground, as shown below::
kubectl -n istio-system port-forward $(kubectl -n istio-system get pod -l app=jaeger -o jsonpath='{.items[0].metadata.name}') 16686:16686
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Validate
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The script in ``clover/tracing`` validates Jaeger installation::
python clover/tracing/validate.py
It validates the installation with the following criteria:
#. Existence of Jaeger all-in-one deployment using Kubernetes
#. Jaeger service is accessible using IP address and port configured in installation steps
#. Optionally, if Jaeger can retrieve service listing for default Istio components
(istio-ingress, istio-mixer). At least one HTTP request must be sent to istio-ingress
after initial Jaeger deployment for this validation to function.
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