无法从Docker容器连接到SQL Server

我们已经使用现有的sql server创建了ASP NET Core App。无法从Docker容器连接到SQL Server

const string connectionString = @"Server=hostname\sqlexpress;Database=DEVDB;User Id=sa;Password=password;"; 
services.AddDbContext<RecruitmentToolsDatabaseContext>(options => options.UseSqlServer(connectionString));

它适用于Windows。在创建具有相同设置的docker映像后，我们无法连接到数据库服务器。

错误：

fail: Microsoft.EntityFrameworkCore.Query.Internal.SqlServerQueryCompilationContextFactory[1] 
    An exception occurred in the database while iterating the results of a query. 
    System.Data.SqlClient.SqlException: 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: 35 - An internal exception was caught) ---> System.AggregateException: One or more errors occurred. (No such device or address) ---> System.Net.Internals.SocketExceptionFactory+ExtendedSocketException: No such device or address 
     at System.Net.Dns.HostResolutionEndHelper(IAsyncResult asyncResult) 
     at System.Net.Dns.EndGetHostAddresses(IAsyncResult asyncResult) 
     at System.Net.Dns.<>c.<GetHostAddressesAsync>b__14_1(IAsyncResult asyncResult) 
     at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization) 
    --- End of stack trace from previous location where exception was thrown ---

我们已经创建了freetds的配置/etc/freetds/freetds.conf

[dev01] 
host = hostname 
instance = sqlexpress 
tds version = 8.0"

，我们能够连接到使用SQSH分贝。

任何想法？

编辑

我Dockerfile：

FROM microsoft/dotnet:latest 
COPY . /app 
WORKDIR /app 

# Install apt packages 
RUN apt-get update && apt-get install -y \ 
    freetds-bin \ 
    freetds-common \ 
    freetds-dev \ 
    sqsh 

RUN touch /etc/freetds/freetds.conf 
RUN echo "[dev01]" > /etc/freetds/freetds.conf 
RUN echo "host = hostname" >> /etc/freetds/freetds.conf 
RUN echo "instance = sqlexpress" >> /etc/freetds/freetds.conf 
RUN echo "tds version = 8.0" >> /etc/freetds/freetds.conf 

RUN touch /home/.sqshrc 
RUN echo "\set username=sa" > /home/.sqshrc 
RUN echo "\set password=password" >> /home/.sqshrc 
RUN echo "\set style=vert" >> /home/.sqshrc 

RUN ["dotnet", "restore"] 
RUN ["dotnet", "build"] 

EXPOSE 5000/tcp 
ENV ASPNETCORE_URLS http://*:5000 

ENTRYPOINT ["dotnet", "run"] 
#CMD ["bash"]

除了正常的ASP .NET核心这个图像包含了我们的测试目的和freetds的SQSH。我们的应用程序正常启动，它正在工作。当我们尝试连接到SQL它会抛出.net异常时发生问题。

来源

2016-08-19 bizon

请不要强迫标签进入问题标题 – Tseng

FreeTDS与ASP.NET无关。该消息明确指出，由于服务器名称或防火墙规则错误，您甚至无法访问服务器。你甚至可以ping服务器？ Docker默认不允许出站连接，您需要指定允许的内容 –

是的，我可以ping该服务器。我使用docker run命令添加主机，并且可以使用FreeTDS检查的Docker镜像中的实例名称，用户名和密码到达服务器。 – bizon

根据this的答案你必须等待.net核心的新版本或安装sql server默认实例。

来源

2016-08-25 14:12:27 MKJ

无法从Docker容器连接到SQL Server

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