docker 配置文件使用经验，后续持续增加

1. 容器中如何访问主机服务

在docker容器、docker compose 中如何访问主机服务呢？

docker容器

20.10.0 版本在 linux 新增 host.docker.internal 支持： docker run -it --add-host=host.docker.internal:host-gateway alpine cat /etc/hosts

127.0.0.1       localhost
::1     localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
172.17.0.1      host.docker.internal # --add-host的作用就是添加了这行到/etc/hosts
172.17.0.3      cb0565ceea26
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add-host 的意思是告诉容器，容器对域名 host.docker.internal 的访问都将转发到 host-gateway 去。

即容器内部访问这个域名 host.docker.internal 时，就会访问到对应的主机上的 host-gateway 地址，从而达到容器访问主机上服务的效果。

docker compose

注意：8080是宿主机提供的服务

version: "2.3" # version改为3.3也可以
services:
  server:
    image: curlimages/curl
    command: curl http://host.docker.internal:8080
    extra_hosts:
      - "host.docker.internal:host-gateway"
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2. docker-compose使用多个docker-compose.yaml配置文件创建容器

如何使用多个Docker compose文件，参见：multiple-compose-files

Docker Compose lets you merge and override a set of Compose files together to create a composite Compose file.

By default, Compose reads two files, a compose.yml and an optional compose.override.yml file. By convention, the compose.yml contains your base configuration. The override file can contain configuration overrides for existing services or entirely new services.

If a service is defined in both files, Compose merges the configurations using the rules described below and in the Compose Specification.

后面的docker compose配置如何与前面的docker compose配置合并，参见：compose-file/13-merge

指定多个docker compose配置文件示例

docker compose -f docker-compose.yaml -f docker-compose.gpu.yaml up -d --build

docker compose -f docker-compose.yaml -f docker-compose.api.yaml up -d --build
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docker-compose.yaml

version: '3.8'

services:
  ollama:
    volumes:
      - ollama:/root/.ollama
    container_name: ollama
    pull_policy: always
    tty: true
    restart: unless-stopped
    image: ollama/ollama:${OLLAMA_DOCKER_TAG-latest}

  open-webui:
    build:
      context: .
      args:
        OLLAMA_BASE_URL: '/ollama'
      dockerfile: Dockerfile
    image: ghcr.io/open-webui/open-webui:${WEBUI_DOCKER_TAG-main}
    container_name: open-webui
    volumes:
      - open-webui:/app/backend/data
    depends_on:
      - ollama
    ports:
      - ${OPEN_WEBUI_PORT-3000}:8080
    environment:
      - 'OLLAMA_BASE_URL=http://ollama:11434'
      - 'WEBUI_SECRET_KEY='
    extra_hosts:
      - host.docker.internal:host-gateway
    restart: unless-stopped

volumes:
  ollama: {}
  open-webui: {}
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docker-compose.gpu.yaml

version: '3.8'

services:
  ollama:
    # GPU support
    deploy:
      resources:
        reservations:
          devices:
            - driver: ${OLLAMA_GPU_DRIVER-nvidia}
              count: ${OLLAMA_GPU_COUNT-1}
              capabilities:
                - gpu
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docker-compose.api.yaml

version: '3.8'

services:
  ollama:
    # Expose Ollama API outside the container stack
    ports:
      - ${OLLAMA_WEBAPI_PORT-11434}:11434
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