Flask Opentelemetry

Distributed HTTP request-response tracing with Opentelemetry.

Project setup guidelines

Create Python Virtual environment and run projec locally.

• Create virtual environment

  python3.6 -m venv venv

• Install dependencies

  . venv/bin/active
  
  pip install -r requirements.txt

• Copy and Set environment variables

  cp sample.env .env

• Export flask application

  export FLASK_APP=app.py

• Run project locally

  flask run

• Fire up another console and run second flask service locally

  python app1.py

Jaeger setup guidelines

Run Jaeger container locally to collect tracing data from Flask application

docker run -p 16686:16686 -p 6831:6831/udp jaegertracing/all-in-one

Demo

Make sure you have Both Flask applications running and jaeger running.

• Make GET requests to below APIs

  localhost:5000/hello
  localhost:5000/zero
  localhost:5000/zero-unhandled
  localhost:5000/zero-trace
  

• Go to jaeger home page and select service my-helloworld-service to find trace

  http://localhost:16686/search
  

• Notice the number of spans for each request. We can add more spans to each REST API for better detailed traces.

• With first request, we can notice that it calls internally second service. As second service also have tracing enabled, we have more in-depth tracing information.