DNS alias causes MassTransit.EndpointNotFoundException upon response

[moc777]

Someone recently suggested that referring to VMs by their actual names in config was not best practice and that we should institute DNS aliases.

However, when configure the receive URI for the consumer to use a DNS alias for the same machien, the response fails - presumably because of the mismatch between the alias and the machine name that MT seems to be still trying to hit:

The endpoint address specified an unknown host: rabbitmq://srv12345wn/bus-WSP12345WN-Foo.Bar.Package-1q3oyybxzs4mmcdabdkcim5381?durable=false&autodelete=true

at MassTransit.RabbitMqTransport.Transport.RabbitMqSendTransportProvider.GetSendTransport(Uri address) at MassTransit.RabbitMqTransport.Transport.RabbitMqSendEndpointProvider.<GetSendEndpoint>d__6.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MassTransit.Transports.SendEndpointCache.<GetSendEndpointFromProvider>d__6.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MassTransit.Util.Caching.PendingValue`2.<CreateValue>d__6.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MassTransit.Transports.SendEndpointCache.<GetSendEndpoint>d__4.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MassTransit.Serialization.BaseConsumeContext.<GetSendEndpoint>d__46.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MassTransit.Serialization.BaseConsumeContext.<RespondAsync>d__35`1.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MassTransit.Util.Caching.PendingValue`2.<CreateValue>d__6.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MassTransit.Util.Caching.NodeValueFactory`1.<CreateValue>d__7.MoveNext()

Is this a known problem?

[Chris Patterson]

You can override your bus endpoint name to something that resolves on other machines. I would ask why you're putting the RabbitMQ broker on an ephemeral machine -- it should be on a machine that has a reasonable lifetime and is available via a known host address.

The bus endpoint name would be on the same RabbitMQ host, and not the local server name.

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[moc777]

P.S. on this: this issue only occurs when configuring a fully-qualified DNS alias e.g. alias.domain.com; when using alias alone, it works fine.

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