无法从asgi应用FastApi连接到在Docker上运行的Datadog Agent

问题描述

我正在尝试从我的fastapi后端连接到datadog。我目前正在尝试使用docker-compose文件在localhost上执行此操作，以使我的datadog-agent和backend-container都在同一网络中运行。这是一个最小的例子

dd-minimal
 - docker-compose.yml
 - backend-client
   - Dockerfile
   - app
     - main.py

docker-compose.yml


version: "3.7"

networks:
  my_network:

services:
  datadog:
    image: datadog/agent:latest
    environment:
     DD_API_KEY: <my-api-key>
     DD_APM_ENABLED: 'true'
    volumes:
     - /var/run/docker.sock:/var/run/docker.sock
     - /proc/:/host/proc/:ro
     - /sys/fs/cgroup:/host/sys/fs/cgroup:ro
    ports: 
      - "8126:8126/tcp"
    networks:
      - my_network
    
  backend-web-client:
    image: gql-backend-api
    build:
      dockerfile: Dockerfile
      context: ./backend-client
    environment:
      DD_TRACE_ANALYTICS_ENABLED: 'true'
      DD_AGENT_HOST: 172.21.0.2
    ports: 
      - "5555:8080"
    networks:
      - my_network
    depends_on: 
      - datadog

Dockerfile

FROM tianGolo/uvicorn-gunicorn-fastapi:python3.8-slim

copY ./app /app
RUN pip install ddtrace==0.41.0

CMD exec ddtrace-run gunicorn --bind :8080 --workers 1 --threads 8 --timeout 0  main:api -k uvicorn.workers.UvicornWorker

main.py

import os

import uvicorn
from fastapi import FastAPI

api = FastAPI()

if __name__ == "__main__":
    uvicorn.run(api,host="127.0.0.1",port=int(os.environ.get("PORT",8080)))

我运行docker-compose up，然后使用以下命令检查我的dd容器的ip

docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' dd-minimal_datadog_1

并在撰写文件中对其进行更新。

当我再次运行docker-compose up时，出现以下错误

- DATADOG TRACER DIAGNOSTIC - Agent not reachable. Exception raised: [Errno 111] Connection refused.

任何帮助将不胜感激

解决方法

您可能需要在datadog代理容器中设置环境变量DD_APM_NON_LOCAL_TRAFFIC=true。

参考：https://docs.datadoghq.com/agent/docker/apm/?tab=linux#docker-apm-agent-environment-variables

datadog docker docker-compose fastapi