Help Center> Distributed Message Service for RabbitMQ> User Guide> Buying an Instance
Updated on 2024-05-06 GMT+08:00
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Buying an Instance

Scenario

RabbitMQ instances are physically isolated and exclusively occupied by each tenant. You can customize the computing capabilities and storage space of a RabbitMQ instance based on service requirements.

RabbitMQ is an open-source service based on the Advanced Message Queuing Protocol (AMQP). It is used to store and forward messages in a distributed system. A RabbitMQ server is compiled in Erlang (supporting high concurrency, distributed deployment, and robust fault tolerance), and a RabbitMQ client can be compiled in various programming languages, including Python, Ruby, .NET, Java, JMS, C, PHP, ActionScript, XMPP, STOMP, and AJAX.

Advanced Message Queuing Protocol (AMQP) is an open standard application layer protocol.

Prerequisites

A VPC configured with security groups and subnets is available.

Procedure

  1. Go to the Buy Instance page.
  2. Specify Billing Mode, Region, Project, and AZ.
  3. Specify the instance name and the enterprise project.
  4. Configure the following instance parameters.

    1. Version: RabbitMQ version. Currently, only 3.8.35 is supported.
    2. Architecture: Select Single-node or Cluster.
      • Single-node: There is only one RabbitMQ broker.
      • Cluster: There are multiple RabbitMQ brokers, achieving highly reliable message storage.
    3. CPU Architecture: Retain the default value.
    4. Flavor: Select a flavor as required.

      To ensure service stability and reliability, DMS for RabbitMQ sets the default memory high watermark to 40%. Publishers will be blocked if the memory usage exceeds 40%. To avoid reaching the high watermark, retrieve messages stacked in the queue in time.

    5. Brokers: Select the required number of brokers.
    6. Storage Space per Broker: Indicates the disk type and total storage space of the RabbitMQ instance.

      For details about how to select a disk type, see Disk Types and Performance.

      • For a single-node instance, the value range is 100 GB to 30,000 GB.
      • For a cluster instance, the value range is Number of brokers × 100 GB to Number of brokers × 30,000 GB.
    7. VPC: Select a VPC and a subnet.

      A VPC provides an isolated virtual network for your RabbitMQ instances. You can configure and manage the network as required.

    8. Security Group: Select a security group.

      A security group is a set of rules for accessing a RabbitMQ instance. Click Manage Security Group. On the console that is displayed, view or create security groups.

    9. Configure SSL.

      This parameter indicates whether SSL authentication is enabled when a client is accessing an instance. If SSL is enabled, data will be encrypted before transmission for enhanced security.

      Once the instance is created, SSL cannot be enabled or disabled.

    Figure 1 Configuring the instance parameters

  5. Enter the username and password used for connecting to the RabbitMQ instance.
  6. Select the required duration.

    This parameter is displayed only if the billing mode is yearly/monthly.

  7. Click Advanced Settings to configure more parameters.

    1. Configure Public Access.

      Public access can be enabled or disabled.

      A RabbitMQ instance with public access enabled can be accessed by using an EIP. After you enable public access, Elastic IP Address is displayed. Select an EIP or click Create Elastic IP to view or buy EIPs.

      Figure 2 Configuring public access for a RabbitMQ instance
      • In comparison with intra-VPC access, enabling public access increases access latency and might lead to packet loss and jitter. Therefore, you are advised to enable public access only during the service development and testing phases.
      • If you manually unbind or delete an EIP on the VPC console, the public access function of the corresponding RabbitMQ instance is automatically disabled.
    2. Specify tags.

      Tags are used to identify cloud resources. When you have many cloud resources of the same type, you can use tags to classify cloud resources by dimension (for example, usage, owner, or environment).

      If your organization has configured tag policies for DMS for RabbitMQ, add tags to RabbitMQ instances based on the tag policies. If a tag does not comply with the tag policies, RabbitMQ instance creation may fail. Contact your organization administrator to learn more about tag policies.

      • If you have created predefined tags, select a predefined pair of tag key and value. You can click View predefined tags to go to the Tag Management Service (TMS) console and view or create tags.
      • You can also create new tags by entering Tag key and Tag value.

      Up to 20 tags can be added to each RabbitMQ instance. For details about the requirements on tags, see Managing Instance Tags.

    3. Enter a description of the instance.

  8. Click Buy Now.
  9. Confirm the instance information, and read and agree to the HUAWEI CLOUD Customer Agreement. If you have selected the yearly/monthly billing mode, click Pay Now and make the payment as prompted. If you have selected the pay-per-use mode, click Submit.
  10. Return to the instance list and check whether the instance has been created.

    It takes 3 to 15 minutes to create an instance. During this period, the instance status is Creating.
    • If the instance is created successfully, its status changes to Running.
    • If the instance is in the Creation failed state, delete it by referring to Deleting an Instance, and buy a new one. If the instance purchase fails again, contact customer service.