Docker环境下API、SQL与RabbitMQ连接故障排查求助

问题现象 #

• 主API通过RabbitMQ发送的消息可在控制台及RabbitMQ管理界面正常查看，但helper API无法接收消息
• Docker容器内的helper API异常要求连接SQL数据库，而本地环境运行该API时无需连接数据库
• 本地环境中所有组件（两个API、SQL、RabbitMQ）通信完全正常，推测问题出在Dockerfile或Docker Compose配置中

已尝试的排查操作 #

• 曾尝试在Dockerfile中添加第二个API的构建逻辑，结果两个API变成完全相同的副本，导致系统崩溃
• 多次执行容器重建、端口配置修改、localhost地址调整、数据库删除重建、helper API重新创建等操作，均未解决问题

相关配置文件 #

Dockerfile #

FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
WORKDIR /app
EXPOSE 7166
ENV ASPNETCORE_URLS=http://+:7166

FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /src
COPY . .

FROM build AS publish
RUN dotnet publish "eCakeShop/eCakeShop.csproj" -c Release -o /app
FROM base AS final
WORKDIR /app
COPY --from=publish /app .

ENTRYPOINT ["dotnet", "eCakeShop.dll"]

Docker Compose 文件 #

version: "3"
services:
  ecakeshop-sql:
    image: "mcr.microsoft.com/mssql/server:2022-latest"
    restart: unless-stopped
    environment:
      SA_PASSWORD: "***********"
      ACCEPT_EULA: "Y"
      MSSQL_PID: "Developer"
    ports:
      - "1434:1433"
    networks:
      - ecakeshopnet

  rabbitmq:
    image: "rabbitmq:latest"
    hostname: "rabbitmq"
    restart: unless-stopped
    ports:
      - "5672:5672"
      - "15672:15672"
    networks:
      - ecakeshopnet

  ecakeshop-api:
    restart: unless-stopped
    build: .
    environment:
      - "ConnectionStrings:eCakeShop=Server=ecakeshop-sql,1433;Database=eCakeShop;Encrypt=true;MultipleActiveResultSets=true;TrustServerCertificate=True;User=sa;Password=**********;"
      - "ASPNETCORE_ENVIRONMENT=Development"
    ports:
      - "7166:7166"
    networks:
      - ecakeshopnet
    depends_on:
      - ecakeshop-sql
      - rabbitmq
    links:
      - ecakeshop-sql

  helper-api:
    restart: unless-stopped
    build: .
    environment:
      - "ConnectionStrings:eCakeShop=Server=ecakeshop-sql,1433;Encrypt=true;MultipleActiveResultSets=true;TrustServerCertificate=True;User=sa;Password=***********;"
      - "ASPNETCORE_ENVIRONMENT=Development"
    ports:
      - "7215:7215"
    networks:
      - ecakeshopnet
    depends_on:
      - rabbitmq

networks:
  ecakeshopnet:
    driver: bridge

内容的提问来源于stack exchange，提问作者Chubbyb0b