本文介绍了使用在 Linux 上运行的 .NET Core 时连接到 MongoDB 失败的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在使用 ASP.NET Core 2.0(刚从一个月前的 1.1 升级)构建一个网站.MongoDB 也是由 Mongo Atlas 在 AWS 上托管的.这个 MongoDB 实例有 3 个副本集，需要 SSL 连接并且已经设置可以从任何 IP 访问.
I'm building a website using ASP.NET Core 2.0 (just upgraded from 1.1 one month ago). MongoDB is hosted by Mongo Atlas on AWS as well.This MongoDB instance has 3 replica set, require SSL to connect and already set can be access from any IP.
它在我的机器 (Windows 10 x64) 和 AWS (Windows Server 2016) 上运行得很好.
It runs quite ok on my machine (Windows 10 x64) and AWS (Windows Server 2016).
我尝试在 Linux 机器上部署它，我使用 apt 在 Ubuntu Server 16.04 上安装 dotnet-runtime-2.0.0，然后我尝试运行我的网站，并得到以下错误(出于安全原因，我隐藏了确切的服务器域名)
I try to deploy it on Linux machines, I use apt to install dotnet-runtime-2.0.0 on Ubuntu Server 16.04, then I try to run my site , and got the following error (for security reason I hide the exact server domain name)
System.TimeoutException: A timeout occured after 30000ms selecting a server using CompositeServerSelector{ Selectors = WritableServerSelector, LatencyLimitingServerSelector{ AllowedLatencyRange = 00:00:00.0150000 } }. Client view of cluster state is { ClusterId : "1", ConnectionMode : "ReplicaSet", Type : "ReplicaSet", State : "Disconnected", Servers : [{ ServerId: "{ ClusterId : 1, EndPoint : "Unspecified/*****-shard-00-00-*****.mongodb.net:27017" }", EndPoint: "Unspecified/*****-shard-00-00-*****.mongodb.net:27017", State: "Disconnected", Type: "Unknown", HeartbeatException: "MongoDB.Driver.MongoConnectionException: An exception occurred while opening a connection to the server. ---> MongoDB.Driver.MongoCommandException: Command isMaster failed: no SNI name sent, make sure using a MongoDB 3.4+ driver/shell..
其余副本集有两个相同的错误.
and two same error for the rest of replica set.
但是我可以通过使用同一台机器的 MongoDB shell 成功连接到 MongoDB 服务器.
But I can successfully connect to MongoDB server by MongoDB shell use the same machine.
我是否缺少对 Ubuntu 的某些依赖，或者 MongoDB .NET SDK 中存在错误?
Am I missing some dependencies on Ubuntu or there's a bug in MongoDB .NET SDK?
完整的堆栈跟踪:
System.TimeoutException: A timeout occured after 30000ms selecting a server using CompositeServerSelector{ Selectors = WritableServerSelector, LatencyLimitingServerSelector{ AllowedLatencyRange = 00:00:00.0150000 } }. Client view of cluster state is { ClusterId : "1", ConnectionMode : "ReplicaSet", Type : "ReplicaSet", State : "Disconnected", Servers : [{ ServerId: "{ ClusterId : 1, EndPoint : "Unspecified/*****-shard-00-00-*****.mongodb.net:27017" }", EndPoint: "Unspecified/*****-shard-00-00-*****.mongodb.net:27017", State: "Disconnected", Type: "Unknown", HeartbeatException: "MongoDB.Driver.MongoConnectionException: An exception occurred while opening a connection to the server. ---> MongoDB.Driver.MongoCommandException: Command isMaster failed: no SNI name sent, make sure using a MongoDB 3.4+ driver/shell..
at MongoDB.Driver.Core.WireProtocol.CommandWireProtocol`1.ProcessReply(ConnectionId connectionId, ReplyMessage`1 reply)
at MongoDB.Driver.Core.WireProtocol.CommandWireProtocol`1.<ExecuteAsync>d__11.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MongoDB.Driver.Core.Connections.ConnectionInitializer.<InitializeConnectionAsync>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MongoDB.Driver.Core.Connections.BinaryConnection.<OpenHelperAsync>d__48.MoveNext()
--- End of inner exception stack trace ---
at MongoDB.Driver.Core.Connections.BinaryConnection.<OpenHelperAsync>d__48.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MongoDB.Driver.Core.Servers.ServerMonitor.<HeartbeatAsync>d__27.MoveNext()" }, { ServerId: "{ ClusterId : 1, EndPoint : "Unspecified/*****-shard-00-01-*****.mongodb.net:27017" }", EndPoint: "Unspecified/*****-shard-00-01-*****.mongodb.net:27017", State: "Disconnected", Type: "Unknown", HeartbeatException: "MongoDB.Driver.MongoConnectionException: An exception occurred while opening a connection to the server. ---> MongoDB.Driver.MongoCommandException: Command isMaster failed: no SNI name sent, make sure using a MongoDB 3.4+ driver/shell..
at MongoDB.Driver.Core.WireProtocol.CommandWireProtocol`1.ProcessReply(ConnectionId connectionId, ReplyMessage`1 reply)
at MongoDB.Driver.Core.WireProtocol.CommandWireProtocol`1.<ExecuteAsync>d__11.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MongoDB.Driver.Core.Connections.ConnectionInitializer.<InitializeConnectionAsync>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MongoDB.Driver.Core.Connections.BinaryConnection.<OpenHelperAsync>d__48.MoveNext()
--- End of inner exception stack trace ---
at MongoDB.Driver.Core.Connections.BinaryConnection.<OpenHelperAsync>d__48.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MongoDB.Driver.Core.Servers.ServerMonitor.<HeartbeatAsync>d__27.MoveNext()" }, { ServerId: "{ ClusterId : 1, EndPoint : "Unspecified/*****-shard-00-02-*****.mongodb.net:27017" }", EndPoint: "Unspecified/*****-shard-00-02-*****.mongodb.net:27017", State: "Disconnected", Type: "Unknown", HeartbeatException: "MongoDB.Driver.MongoConnectionException: An exception occurred while opening a connection to the server. ---> MongoDB.Driver.MongoCommandException: Command isMaster failed: no SNI name sent, make sure using a MongoDB 3.4+ driver/shell..
at MongoDB.Driver.Core.WireProtocol.CommandWireProtocol`1.ProcessReply(ConnectionId connectionId, ReplyMessage`1 reply)
at MongoDB.Driver.Core.WireProtocol.CommandWireProtocol`1.<ExecuteAsync>d__11.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MongoDB.Driver.Core.Connections.ConnectionInitializer.<InitializeConnectionAsync>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MongoDB.Driver.Core.Connections.BinaryConnection.<OpenHelperAsync>d__48.MoveNext()
--- End of inner exception stack trace ---
at MongoDB.Driver.Core.Connections.BinaryConnection.<OpenHelperAsync>d__48.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MongoDB.Driver.Core.Servers.ServerMonitor.<HeartbeatAsync>d__27.MoveNext()" }] }.
at MongoDB.Driver.Core.Clusters.Cluster.ThrowTimeoutException(IServerSelector selector, ClusterDescription description)
at MongoDB.Driver.Core.Clusters.Cluster.WaitForDescriptionChangedHelper.HandleCompletedTask(Task completedTask)
at MongoDB.Driver.Core.Clusters.Cluster.WaitForDescriptionChanged(IServerSelector selector, ClusterDescription description, Task descriptionChangedTask, TimeSpan timeout, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Clusters.Cluster.SelectServer(IServerSelector selector, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Bindings.WritableServerBinding.GetWriteChannelSource(CancellationToken cancellationToken)
at MongoDB.Driver.Core.Operations.CreateIndexesOperation.Execute(IWriteBinding binding, CancellationToken cancellationToken)
at MongoDB.Driver.OperationExecutor.ExecuteWriteOperation[TResult](IWriteBinding binding, IWriteOperation`1 operation, CancellationToken cancellationToken)
at MongoDB.Driver.MongoCollectionImpl`1.ExecuteWriteOperation[TResult](IWriteOperation`1 operation, CancellationToken cancellationToken)
at MongoDB.Driver.MongoCollectionImpl`1.MongoIndexManager.CreateMany(IEnumerable`1 models, CancellationToken cancellationToken)
at MongoDB.Driver.MongoIndexManagerBase`1.CreateOne(IndexKeysDefinition`1 keys, CreateIndexOptions options, CancellationToken cancellationToken)
推荐答案
.NET Core 库不支持 Linux 和 OSX 上的 SNI TLS 扩展.
.NET Core library does not support the SNI TLS extension on Linux and OSX.
因此您将无法连接到免费层 MongoDB Atlas.
Hence you will not be able to connect to a FREE Tier MongoDB Atlas.
https://docs.atlas.mongodb.com/driver-connection/#c-net-driver-example
重要 .NET Core 库不支持 SNI TLS 扩展在 Linux 和 OSX 上.在这些操作上使用 .NET Core 的应用程序系统无法连接到 Atlas 免费层集群.
在 dotnet/corefx github 页面上跟踪了该问题.
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