如何正确组合这个 docker-compose.yml？

Question

在这个 docker-compose.yaml 中，我尝试将 prometheus、grafana 和我的应用程序组合到一个 compose 文件中。 我对 prometheus 和 docker-compose 没有太多经验，所以我决定在堆栈上发布我的第一个问题。 我尝试使用 docker-compose prometheus 从 docker 容器中提取指标，但它不起作用。他们很可能在不同的网络中运营。

version: '3.7'

volumes:
    prometheus_data: {}
    grafana_data: {}

networks:
  front-tier:
  back-tier:

services:
  fastapi:
    image: tiangolo/uvicorn-gunicorn-fastapi:python3.8
    ports:
        - 80:80
    volumes:
        - ./app:/app
    working_dir: /app
    command:
        - 'pip install --no-cache-dir --upgrade -r requirements.txt'
        - 'uvicorn app.main:app --host 0.0.0.0 --port 80'
    restart: always
    
  prometheus:
    image: prom/prometheus:v2.1.0
    volumes:
      - ./prometheus/:/etc/prometheus/
      - prometheus_data:/prometheus
    command:
      - '--config.file=/etc/prometheus/prometheus.yml'
      - '--storage.tsdb.path=/prometheus'
      - '--web.console.libraries=/usr/share/prometheus/console_libraries'
      - '--web.console.templates=/usr/share/prometheus/consoles'
    ports:
      - 9090:9090
    networks:
      - back-tier
    restart: always
  node-exporter:
    image: prom/node-exporter
    volumes:
      - /proc:/host/proc:ro
      - /sys:/host/sys:ro
      - /:/rootfs:ro
    command: 
      - '--path.procfs=/host/proc' 
      - '--path.sysfs=/host/sys'
      - --collector.filesystem.ignored-mount-points
      - "^/(sys|proc|dev|host|etc|rootfs/var/lib/docker/containers|rootfs/var/lib/docker/overlay2|rootfs/run/docker/netns|rootfs/var/lib/docker/aufs)($$|/)"
    ports:
      - 9100:9100
    networks:
      - back-tier
    restart: always
    deploy:
      mode: global
  grafana:
    image: grafana/grafana
    user: "472"
    depends_on:
      - prometheus
    ports:
      - 3000:3000
    volumes:
      - grafana_data:/var/lib/grafana
      - ./grafana/provisioning/:/etc/grafana/provisioning/
    env_file:
      - ./grafana/config.monitoring
    networks:
      - back-tier
      - front-tier
    restart: always

我收到的警告docker-compose up

ERROR: for fastapi Cannot start service fastapi: failed to create shim: OCI runtime create failed: container_linux.go:380: starting container process caused: exec: "pip install --no-cache-dir --upgrade -r requirements.txt": executable file not found in $PATH: unknown. ERROR: Encountered errors while bringing up the project.

Answer 1

错误是因为为fastapi提供的命令造成的。

docker-compose 中的command 配置覆盖了默认命令，只能有一个命令指令。 文档：
https://docs.docker.com/compose/compose-file/compose-file-v3/#command
https://docs.docker.com/engine/reference/builder/#cmd

您为 fastapi 构建服务的方式需要更新：

使用 dockerfile 扩展映像 tiangolo/uvicorn-gunicorn:python3.8 并使用它来安装 requirements.txt 并运行服务器。

# Dockerfile
FROM tiangolo/uvicorn-gunicorn:python3.8

WORKDIR /app

COPY ./app /app

RUN pip install --no-cache-dir --upgrade -r requirements.txt

CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "80"]

并为 fastapi 更新 docker-compose。为 fastapi 添加任何其他配置。

services:
  fastapi:
    build: .
    ports:
        - 80:80
    restart: always
    # add network configuration if needed

您可以在 README here 上找到有关 uvicorn-gunicorn-fastapi-docker 的更多信息。