Updated at: 2022-04-11 GMT+08:00

Creating a Topic


A topic is a specified event to publish messages and subscribe to notifications. It serves as a message sending channel, where publishers and subscribers can interact with each other.

To Create a Topic

  1. Log in to the management console.
  2. Click on the upper left to select the desired region and project.
  3. Under Management & Governance, select Simple Message Notification.

    The SMN console is displayed.

  4. In the navigation pane, choose Topic Management > Topics.

    The Topics page is displayed.

  5. In the upper right corner, click Create Topic.
    Figure 1 Create Topic
  6. Enter a topic name and display name.
    Table 1 Parameter descriptions



    Topic Name

    Topic name, which:

    • Contains only letters, digits, hyphens (-), and underscores (_), and must start with a letter or digit.
    • Contain 1 to 255 characters.
    • Must be unique and cannot be modified once the topic is created.

    Display Name

    Message sender name, which must be fewer than 192 characters.


    After you specify a display name, the sender in email messages will be presented as Display name<username@example.com>. Otherwise, the sender will be username@example.com.


    A tag is a key-value pair. Tags identify cloud resources so that you can easily categorize and search for your resources.

    • Both key and value cannot contain the following characters =*<>\,|/, nor start or end with a space. A key can contain up to 36 characters, and a value can contain up to 43 characters.
    • You can add up to 10 tags for each topic.
  7. Click OK.

    The topic you created is displayed in the topic list. The system generates a topic URN, which is the unique resource identifier of the topic and cannot be changed.

  8. Click the name of the topic to view its details, including the URN, display name, and subscriptions.