ApsaraMQ for RabbitMQ:Step 2: Create resources

1. Create a vhost

A vhost is used to logically isolate resources. Each vhost manages its own exchanges, queues, and bindings. Applications can run on independent vhosts in a secure manner. This way, the business of an application is not affected by other applications. An instance can contain multiple vhosts, and a vhost can contain multiple exchanges and queues. You must specify a vhost before you connect a producer or a consumer to ApsaraMQ for RabbitMQ.

1. Log on to the ApsaraMQ for RabbitMQ console. In the left-side navigation pane, click Instances.

2. In the top navigation bar of the Instances page, select the region where the instance that you want to manage resides. Then, in the instance list, click the name of the instance that you want to manage.

3. In the left-side navigation pane, click vhosts.

4. On the vhosts page, click Create vhost.

5. In the Create vhost panel, enter a vhost name in the vhost Name field and click OK.

2. Create an exchange

An exchange is used to route a message that is received from a producer to one or more queues or to discard the message. An exchange routes a message to queues based on the routing key. Different routing rules are used for different types of exchanges. For more information, see Exchange.

1. In the left-side navigation pane of the Instance Details page, click Exchanges.

2. On the Exchanges page, click the drop-down arrow next to vhost. From the Change drop-down list, select the vhost in which you want to create an exchange. Then, click Create Exchange.

3. In the Create Exchange panel, configure the Exchange Name, Type, and Internal parameters. Then, click OK. The following table describes the parameters.

   Parameter	Description
   Exchange Name	The exchange name. amq. is a reserved field and cannot be used as the prefix of an exchange name. For example, you cannot use amq.test as the name of an exchange.
   Type	The exchange type. Valid values: direct: An exchange of this type routes a message to the queue whose routing key is the same as the routing key of the message. topic: An exchange of this type is similar to an exchange of the direct type. However, the routing rule for a topic exchange is less demanding than that for a direct exchange. A topic exchange routes a message to one or more bound queues based on the result of fuzzy match or multi-condition match between the routing key of the message and the routing keys that are used to bind the queues to the exchange. fanout: An exchange of this type routes all received messages to all queues that are bound to the exchange. A fanout exchange works in the similar way to the broadcasting feature. headers: An exchange of this type is similar to an exchange of the direct type. The only difference between a headers exchange and a direct exchange is that a headers exchange routes messages based on the headers attributes instead of routing keys. When you bind a headers exchange to a queue, you must configure binding attributes in the key-value format. When you send a message to a headers exchange, you must configure the headers attributes in the key-value format for the message. After a headers exchange receives a message, the exchange routes the message based on the matching result between the headers attributes of the message and the binding attributes of the bound queue. x-delayed-message: You can declare an exchange of this type and configure the x-delay header attribute of a message to specify the period of time after which the message is sent. The period of time is in milliseconds. The message is sent to the corresponding queue after the period of time specified by the x-delay header attribute elapses. The exchange routes messages based on the routing rule that corresponds to the exchange type specified by x-delayed-type. x-consistent-hash: An exchange of this type allows you to perform hash calculation on routing keys or header values and use consistent hashing to route a message to different queues.
   x-delayed-type	If you set the Type parameter to x-delayed-message, you must configure this parameter to specify the routing rule for the exchange.
   Hash value	If you set the Type parameter to x-consistent-hash, you must configure this parameter to specify the type of the input value for hash calculation. Valid values: RoutingKey Header Value: If you use headers as the input value for hash calculation, you must specify the value for the hash-header parameter.
   hash-header	If you set the Type parameter to x-consistent-hash and the Hash value parameter to Header Value, you must configure this parameter as the input value for hash calculation.
   Internal	Specifies whether the exchange is an internal exchange. Default value: No. Valid values: Yes: The exchange is an internal exchange and is bound to another exchange. No: The exchange is not an internal exchange and is bound to a queue.

3. Create a queue

In ApsaraMQ for RabbitMQ, a queue is a message queue. All messages from ApsaraMQ for RabbitMQ are delivered to one or more queues.

1. In the left-side navigation pane of the Instance Details page, click Queues.

2. On the Queues page, click the drop-down arrow next to vhost. From the Change drop-down list, select the vhost on which you want to create a queue. Then, click Create Queue.

3. In the Create Queue panel, enter a queue name in the Queue Name field and configure the Auto Delete parameter. Click Advanced Settings and configure the queue parameters that are displayed. Then, click OK.

   Table 1. Parameters

   Parameter	Description	Usage notes
   Queue Name	The queue name.	The name can contain letters, digits, hyphens (-), underscores (_), periods (.), number signs (#), forward slashes (/), and at signs (@). The name must be 1 to 255 characters in length. After a queue is created, you cannot change its name. If you want to change the name of a queue, delete the queue and create another queue. amq. is a reserved field and cannot be used as the prefix of an exchange name. For example, you cannot use amq.test as the name of an exchange.
   Auto Delete	Specifies whether the queue is automatically deleted after the last subscription from consumers to the queue is canceled.	true: The queue is automatically deleted after the last subscription from consumers to this queue is canceled. false: The queue is not automatically deleted after the last subscription from consumers to this queue is canceled.
   Advanced Settings	Other parameters for the queue, such as the dead-letter exchange, dead-letter routing key, and message time-to-live (TTL).	DeadLetterExchange: the exchange to which dead-letter messages are delivered. DeadLetterRoutingKey: the routing key of dead-letter messages. A dead-letter exchange sends dead-letter messages to the queue whose routing key matches the routing key of the dead-letter messages. MessageTTL: the message TTL, in milliseconds. A message that is not consumed within the specified message TTL is a dead-letter message and is sent to a dead-letter exchange. For more information, see Message TTL.

4. Create a binding

1. On the Queues page, find the queue that you want to manage and click Details in the Actions column.

2. On the Queue Details page, click the Bound as Destination tab. Then, click Add Binding.

3. In the Add Binding panel, configure the Source Exchange and Routing Key parameters. Then, click Confirm.

   Note

   If the bound exchange is of the x-consistent-hash type, the routing key indicates the weight of the queue. The value of a weight must be an integer that ranges from 1 to 20.

5. Create a pair of username and password

1. In the left-side navigation pane of the Instance Details page, click Static Accounts.

2. On the Static Accounts page, click Create Username/Password.

3. In the Create Username/Password panel, configure the AccessKey ID and AccessKey Secret parameters and click OK.

   Note

   You can obtain the values of the AccessKey ID and AccessKey Secret parameters in the RAM console. For more information, see Create an AccessKey pair.

   On the Static Accounts page, the created pair of static username and password appears. The password is masked.

4. In the Password column of the created pair of static username and password, click Display to view the password.