Python Django Gunicorn

Prerequisites

Python 3

Installation

1. Install dependencies:

   pip install opentelemetry-distro opentelemetry-exporter-otlp-proto-http
   opentelemetry-bootstrap -a install

2. Modify the gunicorn config file as follows:

   gunicorn.conf.py

   import os
   from opentelemetry import trace
   from opentelemetry.semconv.resource import ResourceAttributes
   from opentelemetry.sdk.trace import TracerProvider, Resource
   from opentelemetry.sdk.trace.export import (
      BatchSpanProcessor,
      ConsoleSpanExporter,
      SimpleSpanProcessor,
   )
   from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter
   from socket import gethostname
   
   bind = "127.0.0.1:8000"
   
   # Sample Worker processes
   workers = 4
   worker_class = "sync"
   worker_connections = 1000
   timeout = 30
   keepalive = 2
   
   # Sample logging
   errorlog = "-"
   loglevel = "info"
   accesslog = "-"
   access_log_format = (
      '%(h)s %(l)s %(u)s %(t)s "%(r)s" %(s)s %(b)s "%(f)s" "%(a)s"'
   )
   
   def post_fork(server, worker):
      server.log.info("Worker spawned (pid: %s)", worker.pid)
   
      provider = TracerProvider(resource=Resource({
         ResourceAttributes.SERVICE_NAME: os.environ['OTEL_SERVICE_NAME'],
         ResourceAttributes.HOST_NAME: gethostname() or 'UNSET',
      }))
      if os.getenv('OTEL_LOG_LEVEL', '') == 'debug':
         processor = SimpleSpanProcessor(ConsoleSpanExporter())
      else:
         processor = BatchSpanProcessor(OTLPSpanExporter())
      provider.add_span_processor(processor)
      trace.set_tracer_provider(provider)

3. Add the highlighted lines below to your project's wsgi.py file:

   wsgi.py

   import os
   from django.core.wsgi import get_wsgi_application
   from opentelemetry.instrumentation.django import DjangoInstrumentor
   
   os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'mysite.settings')
   
   DjangoInstrumentor().instrument()
   # Additional instrumentations can be enabled by
   # following the docs for respective instrumentations at
   # https://github.com/open-telemetry/opentelemetry-python-contrib/tree/main/instrumentation
   #
   # A working example with multiple instrumentations is available at
   # https://github.com/cubeapm/sample_app_python_django_gunicorn
   
   application = get_wsgi_application()

4. Modify the application run command as follows:

   DJANGO_SETTINGS_MODULE=<django_app_name>.settings \
   OTEL_METRICS_EXPORTER=none \
   OTEL_LOGS_EXPORTER=none \
   OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=http://<ip_address_of_cubeapm_server>:4318/v1/traces \
   OTEL_EXPORTER_OTLP_COMPRESSION=gzip \
   OTEL_SERVICE_NAME=<app_name> \
   gunicorn mysite.wsgi -c gunicorn.conf.py

Troubleshooting

The following can be used for debugging:

OTEL_LOG_LEVEL=debug

The following command can be tried on the application host server to check connectivity to CubeAPM server(s):

telnet <ip_address_of_cubeapm_server> 4318