[英]Cannot connect to SQL Server from a Docker container
我們已經使用現有的SQL Server創建了ASP NET Core App。
const string connectionString = @"Server=hostname\sqlexpress;Database=DEVDB;User Id=sa;Password=password;";
services.AddDbContext<RecruitmentToolsDatabaseContext>(options => options.UseSqlServer(connectionString));
它適用於Windows。 創建具有相同設置的Docker映像后,我們無法連接到數據庫服務器。
錯誤:
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 ---
我們已經創建了freetds配置/etc/freetds/freetds.conf
[dev01]
host = hostname
instance = sqlexpress
tds version = 8.0"
並且我們能夠使用sqsh連接到該數據庫。
有任何想法嗎?
編輯
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,此圖像還包含freetds和sqsh,用於我們的測試目的。 我們的應用程序正常啟動,正在運行。 當我們嘗試連接到sql時,會發生問題,並拋出.net異常。
根據此答案,您必須等待.net core的新版本或安裝sql server默認實例。
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