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MassTransit–Using RabbitMQ Virtual Hosts

Today I want to talk about a specific feature in RabbitMQ and how we can use this feature with my favorite messaging library MassTransit.

Virtual Hosts

With virtual hosts you can create a logical grouping in  your RabbitMQ cluster. Every exchange, queue, binding, user permissions, and so on is bound to a specific virtual host and isolated from the other virtual hosts. This helps to avoid naming collisions.

There is always at least one virtual host in use; the default one is ‘/’.

To create a new virtual host in your RabbitMQ cluster, you can use the rabbitmqctl's add_vhost command:

rabbitmqctl add_vhost development

Or you can use the RabbitMQ Management portal:

  • In the Management Portal go to the Admin tab and click on the Virtual Hosts section on the right:

  • Go to the Add Virtual Host form and enter a name and an optional description and tags:

  • Click on Add virtual host to create the new virtual host.

Remark: Be aware that virtual hosts are a security boundary, so I would recommend to create different users per virtual host.

Using Virtual Hosts in MassTransit

Now that we have a new Virtual Host created, let’s see how we can use this in MassTransit.

Let’s have a look at a simple example from the MassTransit documentation:

In the example above, the virtual host is passed as a second parameter after the servername in the Host() method:

You can also specify it through the URI:

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