Frequently asked questions about EventBridge.
What is EventBridge?
Alibaba Cloud EventBridge is a fully managed, serverless event bus designed for high scalability and reliability. It supports event query, event tracing, and cross-account event transfer. EventBridge is the core building block for event-driven architectures on Alibaba Cloud.
What are the benefits of EventBridge?
Fully managed: No deployment, no operations. Activate with one click and rely on Alibaba Cloud infrastructure from day one.
Pay-per-use: Billed only for API calls—no upfront cost to build event-driven service components.
High reliability and elasticity: Built on Message Queue, ECS, and cloud disks, EventBridge maintains triplicate event data backup and active/standby high-availability failover.
Alibaba Cloud ecosystem integration: Works with a broad range of Alibaba Cloud services out of the box.
What is the billing method for EventBridge?
See Billing overview.
Which regions does EventBridge support?
EventBridge supports the China (Hangzhou), China (Shanghai), China (Beijing), and China (Hong Kong) regions. For a complete list of endpoints, see Regions and endpoints.
How does EventBridge ensure data security?
Access control is enforced through Alibaba Cloud Resource Access Management (RAM). Unauthorized users cannot access your event bus data.
All events are published to EventBridge over secure HTTPS endpoints.
How do I grant the permissions to use EventBridge?
Log in to the RAM console with your Alibaba Cloud account to create RAM users and assign the permissions they need—for example, resource management, event publishing, monitoring, and O&M. To grant temporary access to external users, use Security Token Service (STS). See Grant permissions to a RAM user.
To share access with another enterprise, create a RAM role in your Alibaba Cloud account (Enterprise A), grant the role the required permissions, and then assign it to the other enterprise (Enterprise B). This lets Enterprise B's Alibaba Cloud account and its RAM users access your resources. See Grant permissions across Alibaba Cloud accounts.
Why do events fail to be published?
Check the following common causes:
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Wrong endpoint
Copy the endpoint directly from the EventBridge console. Do not prefix it with a protocol header such as HTTP.
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Network misconfiguration
Choose the public endpoint or VPC endpoint based on your producer's network environment.
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Resource not found
Confirm the target event bus exists before publishing.
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Insufficient permissions
Verify that the AccessKey ID and AccessKey secret are correct and that the required RAM permissions are in place. See Grant permissions to a RAM user.
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Event size exceeded
Check the size limits in Limits.
To calculate the actual size of your event, see Calculate the size of events published by PutEvents.
Why do events fail to be routed?
Routing failures are typically caused by one of two issues:
The destination endpoint is rate-limiting the delivery.
The event target is rejecting transformed event content.
To diagnose the exact cause, query the event trace for the failed event. See Event query.
If you configure an HTTP endpoint as the event target, you must use a public endpoint.
Which Alibaba Cloud services can act as EventBridge event sources, and what are the EventBridge event formats?
For a full list of supported EventBridge event sources, see Event source overview.
For the event formats produced by each EventBridge source service, see Enterprise Distributed Application Service events.
How do I configure event patterns to filter events?
See Manage event rules.