.NET Core/SQL Server docker 撰写网络问题

Question

我是 docker 新手，正在尝试使用 docker-compose 将 .NET Core 3.0 应用程序与 SQL 数据库连接起来。
我在 docker-compose.yml 中定义了连接字符串。
我尝试过使用 127.0.0.1 和不提供端口（1433）。

这是我得到的例外：

webapi_1  | fail: Microsoft.EntityFrameworkCore.Database.Connection[20004]
webapi_1  |       An error occurred using the connection to database 'InstaDb' on server '127.0.0.1,1433'.
webapi_1  | fail: Microsoft.EntityFrameworkCore.Query[10100]
webapi_1  |       An exception occurred while iterating over the results of a query for context type 'Insta.Infra.Data.Context.InstaDbContext'.
webapi_1  |       Microsoft.Data.SqlClient.SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 40 - Could not open a connection to SQL Server)

docker-compose.yml

version: "3.9"
services:
    webapi:
        build: .
        ports:
            - "5000:80"
        depends_on:
            - db
        environment:
            ConnectionStrings:InstaDBConnection: "Server=127.0.0.1,1433;Database=InstaDb;User=sa;Password=#Admin123;MultipleActiveResultSets=True;"
    db:
        image: "mcr.microsoft.com/mssql/server"
        environment:
            SA_PASSWORD: "#Admin123"
            ACCEPT_EULA: "Y"

Dockerfile

FROM mcr.microsoft.com/dotnet/sdk:3.1 AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443

FROM mcr.microsoft.com/dotnet/sdk:3.1 AS build
WORKDIR /src
COPY ["Insta.Mvc/Insta.Mvc.csproj", "Insta.Mvc/"]
COPY ["Insta.Infra.Data/Insta.Infra.Data.csproj", "Insta.Infra.Data/"]
COPY ["Insta.Application/Insta.Application.csproj", "Insta.Application/"]
COPY ["Insta.Domain/Insta.Domain.csproj", "Insta.Domain/"]
COPY ["Insta.Common.Utils/Insta.Common.Utils.csproj", "Insta.Common.Utils/"]
COPY ["Insta.Infra.IoC/Insta.Infra.IoC.csproj", "Insta.Infra.IoC/"]
RUN dotnet restore "Insta.Mvc/Insta.Mvc.csproj"
COPY . .

WORKDIR "/src/Insta.Mvc"
RUN dotnet build "Insta.Mvc.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "Insta.Mvc.csproj" -c Release -o /app/publish

WORKDIR /src
RUN chmod +x ./entrypoint.sh
CMD /bin/bash ./entrypoint.sh

WORKDIR "/src/Insta.Mvc"
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "Insta.Mvc.dll"]

Answer 1

您可以使用 docker composes 创建网络，您也可以在其中通过容器的域名从容器访问其他容器，如下所示：

version: "3.9"
services:
    webapi:
        build: .
        ports:
            - "5000:80"
        depends_on:
            - db
        environment:
            ConnectionStrings:InstaDBConnection: "Server=db,1433;Database=InstaDb;User=sa;Password=#Admin123;MultipleActiveResultSets=True;"
        networks:
          - your-network
    db:
        image: "mcr.microsoft.com/mssql/server"
        environment:
            SA_PASSWORD: "#Admin123"
            ACCEPT_EULA: "Y"
        networks:
          - your-network
  
networks:
    your-network:
        name: your-network

请注意，在连接字符串中，您可以使用服务名称作为主机名。