What are ECS resources?-Elastic Compute Service(ECS)-阿里云帮助中心

ECS resources include instances, auto provisioning groups, images, disks, security groups, and ENIs. Each resource has a unique ID and is bound to a specific region or zone.

Limitations

Grant permissions to RAM users with your Alibaba Cloud account before they create or manage resources. See Control access to resources by using RAM users.
Resource creation and retention quotas vary by ECS usage. See Limits.

Resource IDs

Each resource has a unique ID that consists of a resource-type letter prefix, a hyphen (-), and a fixed-length string. Examples: instance ID i-bp13izg0l4s3********, custom image ID m-bp1gbwvlscsk********, and launch template ID lt-bp18i1ibppnr********.

Some API and CLI parameters require resource IDs. For example, the following command starts an ECS instance with ID i-bp13izg0l4s3********:

aliyun ecs StartInstance --RegionId cn-hangzhou --InstanceId i-bp13izg0l4s3********

Resource locations

Each ECS resource is bound to a region or zone. See Regions and zones for details.

Resource	Location	Description
Instance	Zone	An ECS instance is tied to its creation zone. Instance type availability varies by zone within a region.
Reserved instance	Zone or region	Zonal reserved instances provide zone-level resource reservation. Regional reserved instances offset pay-as-you-go bills for specific instance types in the same region.
Storage capacity unit (SCU)	Region	An SCU offsets pay-as-you-go bills for disks in the same region.
Image	Region	Custom image: To use a custom image across regions, copy it to the destination region. A new image ID is generated in the destination region. Public image: Public images released in all regions have no region restrictions.
Elastic Block Storage (EBS) device	Zone	An EBS device can only be attached to ECS instances in the same zone.
Snapshot	Region	A snapshot backs up data of a cloud disk in the same region.
Security group	Region	Security group rules only enable internal network communication between ECS instances in the same region. Cross-region internal communication requires a cloud service configured for Internet communication.
SSH key pair	Region	To use a key pair across regions, create it locally and import it to the target region.
ENI	Region	An ENI can only be bound to ECS instances in the same region.
Launch template	Region	A launch template is region-specific. Specify the zone when using it to create ECS instances.
Deployment set	Region	A deployment set applies only to ECS instances in the same region.
Auto provisioning group	Region	An auto provisioning group is region-specific. Specify the zone for creating pay-as-you-go or spot instances.
Tag	Region	A tag can only be added to ECS instances in the same region.
Cloud Assistant command	Region	A Cloud Assistant command can only run on ECS instances in the same region.