This demo is based on Jaeger hotrod-tutorial.

• Discover architecture of the whole system via data-driven dependency diagram
• View request timeline & errors, understand how the app works
• Find sources of latency, lack of concurrency
• Highly contextualized logging
• Use baggage propagation to
  • Diagnose inter-request contention (queueing)
  • Attribute time spent in a service
• Use open source libraries with OpenTracing integration to get vendor-neutral instrumentation for free

• Download docker-compose.yml from https://github.com/jaegertracing/jaeger/blob/master/examples/hotrod/docker-compose.yml
• Run Jaeger backend and HotROD demo with docker-compose -f path-to-yml-file up
• Access Jaeger UI at http://localhost:16686 and HotROD app at http://localhost:8080
• Shutdown / cleanup with docker-compose -f path-to-yml-file down

Alternatively, you can run each component separately as described below.

An all-in-one Jaeger backend is packaged as a Docker container with in-memory storage.

docker run \
  --rm \
  --name jaeger \
  -p6831:6831/udp \
  -p16686:16686 \
  jaegertracing/all-in-one:latest

Jaeger UI can be accessed at http://localhost:16686.

git clone [email protected]:jaegertracing/jaeger.git jaeger
cd jaeger
go run ./examples/hotrod/main.go all

docker run \
  --rm \
  --link jaeger \
  --env JAEGER_AGENT_HOST=jaeger \
  --env JAEGER_AGENT_PORT=6831 \
  -p8080-8083:8080-8083 \
  jaegertracing/example-hotrod:latest \
  all

Then open http://127.0.0.1:8080

The app exposes metrics in either Go's expvar format (by default) or in Prometheus format (enabled via -m prometheus flag).

• expvar: curl http://127.0.0.1:8083/debug/vars
• Prometheus: curl http://127.0.0.1:8083/metrics

The HotROD UI can generate links to the Jaeger UI to find traces corresponding to each executed request. By default it uses the standard Jaeger UI address http://localhost:16686, but if your Jaeger UI is running at a different address, it can be customized via -j <address> flag passed to HotROD, e.g.

go run ./examples/hotrod/main.go all -j http://jaeger-ui:16686