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This is a brief description of RabbitMQ in relation to Digizuite. It's really Important that you only change the RabbitMQ configuration if the customer specifically asks for it. 

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NServiceBus RabbitMQ documentation: https://docs.particular.net/transports/rabbitmq/

Break down of RabbitMQ's relation to Digizuite:

1. RabbitMQ is multi-tenant and can be structured in a concept called Virtual Hosts (https://www.rabbitmq.com/vhosts.html).
   
   
2. Digizuite utilizes the Virtual Host concept to separate queues, exchanges, and bindings between systems from each other. This allows you to utilize an existing RabbitMQ queue as an example so that systems on the same server can be separated on the same server and with a vhost in RabbitMQ for each of them systems.
   
   In the RabbitMQ Management Studio (usually on localhost:15672) you can get info on all virtual hosts:
   
   
   
3. For each vhost, we create a publish queue and some subscription queues. Right now there is a sub-queue for the DC and one for all other services; such as audit and AI.
   
   
   
   
4. To exchange messages between queues, we use the conventional routing topology as per NServiceBus (https://docs.particular.net/transports/rabbitmq/routing-topology) rather than the Direct Routing with routing keys as originally preferred. The reason for this is that conventional routing takes into consideration the inheritance aspect and will therefore generate all exchanges for all interfaces as illustrated below:
   

Configuration

In almost all cases you won't have to do any configuration for RabbitMQ. The Digizuite installer will automatically install RabbitMQ and start it up on http://localhost:15672. This is the default (connection string format: host=localhost;username=user;password=password;virtualhost=uniqueDbName).

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1. A configurable RabbitMQ connection string. Formatted like this: host=localhost;username=guest;password=guest;virtualhost=uniqueDbName
2. This must be set in two places
   1. DAM Center app settings in web.config.
      

      <appSettings>
            <add key="rabbitMqConnectionString" value="host=localhost;username=guest;password=guest;virtualhost=uniqueDbName" />
            ......
      </appSettings>

   2. Digizuite Core services appsettings.json (...[yourDC]/DigizuiteCore/appsettings.json): 
      

      "RabbitMQ": {        
           "ConnectionString": "host=localhost;username=user;password=password;virtualhost=uniqueDbName"
      }

Troubleshooting

One thing to be aware of after the installation has been done is the connections in rabbit. Always make sure that you see these two following connections in the management UI: (it's also okay if there are more than two)

*.dam.core.subscriber 

*.dam.core.webhost.subscriber

If you do not see these then recycle the two highlighted app pools in the IIS:

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