无法从Docker容器连接到SQL Server
我们用现有的sql server创build了ASP NET Core App。
const string connectionString = @"Server=hostname\sqlexpress;Database=DEVDB;User Id=sa;Password=password;"; services.AddDbContext<RecruitmentToolsDatabaseContext>(options => options.UseSqlServer(connectionString)); 它在Windows上工作。 在创build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build了freetdsconfiguration/etc/freetds/freetds.conf
[dev01] host = hostname instance = sqlexpress tds version = 8.0"
我们可以使用sqsh连接到那个数据库。
有任何想法吗？
编辑
我的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"]
除了普通的ASP .NET Core之外，这个映像还包含freetds和sqsh以供我们testing。 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.netexception时发生问题。
根据这个答案，你必须等待.net核心的新版本或安装SQL Server默认实例。