在测试环境部署服务后,调用API会抛出以下异常:
Microsoft.Data.SqlClient.SqlException (0x80131904): A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: SSL Provider, error: 31 - Encryption(ssl/tls) handshake failed)
---> System.IO.IOException: Received an unexpected EOF or 0 bytes from the transport stream.
原因如下:
Docker容器中支持的TLS最低版本为1.2,但对应的SQL Server不支持1.2版本,可通过挂载配置文件的方式将容器支持的TLS最低版本设置为1.0来解决该问题。
启动容器,然后进入容器内/etc/ssl
目录下拷贝出openssl.cnf
文件,修改TLS配置。尽量不使用其他已存在的openssl.cnf
文件,可能不兼容导致修改无效:
[system_default_sect]
MinProtocol = TLSv1
CipherString = DEFAULT@SECLEVEL=1
将修改后的openssl.cnf
文件挂载到容器上:
/home/services/conf/openssl.cnf:/etc/ssl/openssl.cnf
⚠️上述做法可能存在安全隐患,官方比较推荐的做法是使用支持TLS1.2的SQL Server版本
除了通过挂载文件之外,还可以在Dockerfile
中进行修改:
Dockerfile
中添加以下两条命令:
RUN sed -i 's/TLSv1.2/TLSv1/g' /etc/ssl/openssl.cnf
RUN sed -i 's/DEFAULT@SECLEVEL=2/DEFAULT@SECLEVEL=1/g' /etc/ssl/openssl.cnf
一个完整的Dockerfile
示例:
FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /source
COPY . .
RUN dotnet restore
RUN dotnet publish ./src/APIs/APIs.csproj -c release -o /app --no-restore
FROM mcr.microsoft.com/dotnet/aspnet:6.0
RUN sed -i 's/TLSv1.2/TLSv1/g' /etc/ssl/openssl.cnf
RUN sed -i 's/DEFAULT@SECLEVEL=2/DEFAULT@SECLEVEL=1/g' /etc/ssl/openssl.cnf
WORKDIR /app
COPY --from=build /app ./
ENTRYPOINT ["dotnet", "APIs.dll"]
容器中连接数据库报超时错误:
An exception occurred while iterating over the results of a query for context type'SqlServerRepository.DataBackgroundDbContext'.
Microsoft.Data.SqlClient.SqlException (0x80131904): Connection Timeout Expired. The timeout period elapsed during the post-login phase. The connection could have timed out while waiting for server to complete the login process and respond; Or it could have timed out while attempting to create multiple active connections. The duration spent while attempting to connect to this server was - [Pre-Login] initialization=45; handshake=334; [Login] initialization=5; authentication=22; [Post-Login] complete=14299
通过ping
以及telnet
命令确认容器到数据库的网络是通顺的,具体原因如下:
数据库版本是SQL Server 2008,只打了SP1的补丁,在linux环境下SqlClient库无法连接到数据库,升级安装SP3后问题解决。
Github上SqlClient项目Issues下挺多关于数据库连接相关问题。