Elastic Compute Service (ECS) can send notifications for instance events such as system events, instance state changes, and release of preemptible instances.

Events

ECS can send notifications for the following instance events:

System events

When a system event occurs on an instance, ECS sends an initial notification for the event, and sends subsequent notifications every time the event state changes. For the names of notifications for system events, see Appendix: Notifications for instance-related system events.

The following examples show notifications in the JSON format for an Instance restart due to system maintenance (SystemMaintenance.Reboot) event.

  • The initial notification indicates that the event is in the Scheduled (Scheduled) state. 
    {
  "ver": "1.0",
  "id": "2256A988-0B26-4E2B-820A-8A********E5",
  "product": "ECS",
  "resourceId": "acs:ecs:cn-hangzhou:169070********30:instance/i-bp1ecr********5go2go",
  "level": "CRITICAL",
  "name": "Instance:SystemMaintenance.Reboot:Scheduled",
  "userId": "169070********30",
  "eventTime": "20190409T121826.922+0800",
  "regionId": "cn-hangzhou",
  "content": {
    "eventId": "e-bp11trd********pqum2",
    "publishTime": "2019-04-09T04:18:26Z",
    "notBefore": "2019-04-12T01:01:01Z",      
    "instanceId": "i-bp1ecr********5go2go",   
    "eventType": "SystemMaintenance.Reboot",  
    "eventStatus": "Scheduled"
  }
}
  • If you restart the instance before the time specified by the notBefore subparameter, the system event is avoided and ECS sends a notification to indicate that the event state is changed to Avoided (Avoided). 
    {
  "ver": "1.0",
  "id": "2256A988-0B26-4E2B-820A-8A********E5",
  "product": "ECS",
  "resourceId": "acs:ecs:cn-hangzhou:169070********30:instance/i-bp1ecr********5go2go",
  "level": "CRITICAL",
  "name": "Instance:SystemMaintenance.Reboot:Scheduled",
  "userId": "169070********30",
  "eventTime": "20190410T160101.922+0800",
  "regionId": "cn-hangzhou",
  "content": {
    "eventId": "e-bp11trdr********qum2",
    "publishTime": "2019-04-09T04:18:26Z",
    "notBefore": "2019-04-12T01:01:01Z",
    "instanceId": "i-bp1ecr********5go2go",
    "eventType": "SystemMaintenance.Reboot",
    "eventStatus": "Avoided",
    "executeStartTime": "2019-04-10T08:01:01Z",  
    "executeFinishTime": "2019-04-10T08:01:01Z"  
  }
}
The following table describes the subparameters contained in the content parameter.
Subparameter Description Example
eventId The ID of the system event. e-t4navn7********6x5no
publishTime The time when the system event is published. 2019-04-09T04:18:26Z
notBefore The scheduled start time of the event. This subparameter is available only for system maintenance events. 2019-04-12T01:01:01Z
instanceId The ID of the affected instance. i-bp1ecr********5go2go
eventType The type of the system event. For more information about the subparameter values, see Overview. SystemMaintenance.Reboot
eventStatus The state of the system event. For more information about the subparameter values, see Overview. Avoided
executeStartTime The start time of the system event. The time is in UTC. 2019-04-10T08:01:01Z
executeFinishTime The end time of the system event. The time is in UTC.
Note The executeStartTime and and executeFinishTime subparameters are available only for events in the Executing (Executing), Executed (Executed), Canceled (Canceled), or Avoided (Avoided) state.
2019-04-10T08:01:01Z

Instance state changes

When the state of your instance changes, ECS sends you an event notification. For more information about instance state changes, see Instance lifecycle.

The following example shows a notification for the event that the state of an instance changes to Running (Running): 

{
  "ver": "1.0",
  "id": "2256A988-0B26-4E2B-820A-8A********E5",
  "product": "ECS",
  "resourceId": "acs:ecs:cn-hangzhou:169070********30:instance/i-bp1ecr********5go2go",
  "level": "INFO",
  "name": "Instance:StateChange",
  "userId": "169070********30",
  "eventTime": "20190409T121826.922+0800",
  "regionId": "cn-hangzhou",
  "content": {
    "resourceId": "i-bp1ecr********5go2go",  
    "resourceType": "ALIYUN::ECS::Instance", 
    "state": "Running"                       
  }
}
The following table describes the subparameters contained in the content parameter.
Subparameter Description Example
resourceId The ID of the instance. i-bp1ecr********5go2go
resourceType The type of the resource. Set the value to ALIYUN::ECS::Instance. ALIYUN::ECS::Instance
state The state of the instance. Valid values:
  • Created: The instance is created. This event notification is sent only once after the instance is created.
  • Starting: The instance is being started.
  • Running: The instance is running.
  • Stopping: The instance is being stopped or restarted.
  • Stopped: The instance is stopped.
  • Deleted: The instance is released.
Running

Release of a preemptible instance

Preemptible instances may be released due to fluctuations in market prices or insufficient resources. Five minutes before a preemptible instance is released, ECS sends an event notification to warn you about the interruption of the instance. For more information, see Overview.

The following example shows such an event notification in the JSON format: 

{
  "ver": "1.0",
  "id": "2256A988-0B26-4E2B-820A-8A********E5",
  "product": "ECS",
  "resourceId": "acs:ecs:cn-hangzhou:169070********30:instance/i-bp1ecr********5go2go",
  "level": "INFO",
  "name": "Instance:PreemptibleInstanceInterruption",
  "userId": "169070********30",
  "eventTime": "20190409T121826.922+0800",
  "regionId": "cn-hangzhou",
  "content": {
    "instanceId": "i-bp1ecr********5go2go",  
    "action": "delete"                       
  }
}
The following table describes the subparameters contained in the content parameter.
Subparameter Description Example
instanceId The ID of the preemptible instance. i-bp1ecr********5go2go
action The operation on the preemptible instance. Set the value to delete. delete

Hot migration of ECS instances between dedicated hosts

You can call the ModifyInstanceDeployment operation to perform hot migration of ECS instances between dedicated hosts. Hot migration of ECS instances is asynchronous, and the states of the ECS instances do not change during the migration. You can configure notifications for the Instance:LiveMigrationAcrossDDH event to receive updates about the migration progress.

The following examples show the event notifications in the JSON format.

  • Notification for the event that the hot migration starts: 
    {
  "ver": "1.0",
  "id": "2256A988-0B26-4E2B-820A-8A0580D0B8E5",
  "product": "ECS",
  "resourceId": "acs:ecs:cn-hangzhou:169070********30:instance/i-bp1ecr********5go2go",
  "level": "INFO",
  "instanceName": "instance-event-subscription",
  "name": "Instance:LiveMigrationAcrossDDH",
  "userId": "169070********30",
  "eventTime": "20180608T092537.922+0800",
  "regionId": "cn-hangzhou",
  "content": {
      "instanceId" : "i-bp1ecr********5go2go",
      "sourceDedicatedHostId" : "dh-2ze3lm********t8nr82",
      "destinationDedicatedHostId" : "dh-2ze3lm********t8nr83",
      "startTime" : "2018-06-08T01:25:37Z",
      "status" : "started"
  }
}
  • Notification for the event that the hot migration is complete: 
    {
  "ver": "1.0",
  "id": "2256A988-0B26-4E2B-820A-8A0580D0B8E5",
  "product": "ECS",
  "resourceId": "acs:ecs:cn-hangzhou:169070********30:instance/i-bp1ecr********5go2go",
  "level": "INFO",
  "instanceName": "instance-event-subscription",
  "name": "Instance:LiveMigrationAcrossDDH",
  "userId": "169070********30",
  "eventTime": "20180608T092545.922+0800",
  "regionId": "cn-hangzhou",
  "content": {
      "instanceId" : "i-bp1ecr********5go2go",
      "sourceDedicatedHostId" : "dh-2ze3lm********t8nr82",
      "destinationDedicatedHostId" : "dh-2ze3lm********t8nr83",
      "startTime" : "2018-06-08T01:25:37Z",
      "endTime" : "2018-06-08T01:25:45Z",
      "status" : "accomplished"
  }
}
  • Notification for the event that the hot migration fails: 
    {
  "ver": "1.0",
  "id": "2256A988-0B26-4E2B-820A-8A0580D0B8E5",
  "product": "ECS",
  "resourceId": "acs:ecs:cn-hangzhou:169070********30:instance/i-bp1ecr********5go2go",
  "level": "INFO",
  "instanceName": "instance-event-subscription",
  "name": "Instance:LiveMigrationAcrossDDH",
  "userId": "169070********30",
  "eventTime": "20180608T092545.922+0800",
  "regionId": "cn-hangzhou",
  "content": {
      "instanceId" : "i-bp1ecr********5go2go",
      "sourceDedicatedHostId" : "dh-2ze3lm********t8nr82",
      "destinationDedicatedHostId" : "dh-2ze3lm********t8nr83",
      "startTime" : "2018-06-08T01:25:37Z",
      "endTime" : "2018-06-08T01:25:45Z",
      "status" : "failed"
  }
}
The following table describes the subparameters contained in the content parameter.
Subparameter Description Example
instanceId The ID of the instance. i-bp1ecr********5go2go
sourceDedicatedHostId The ID of the source dedicated host. dh-2ze3lm********t8nr82
destinationDedicatedHostId The ID of the destination dedicated host. dh-2ze3lm********t8nr83
startTime The start time of the migration. The time is in UTC. 2018-06-08T01:25:37Z
endTime The end time of the migration. The time is in UTC. 2018-06-08T01:25:45Z
status The state of the hot migration. Valid values:
  • started: The migration starts.
  • failed: The migration fails.
  • accomplished: The migration is complete.
accomplished

Changes in the performance mode of burstable instances

If the performance mode of a burstable instance changes, ECS sends a notification for the Instance:PerformanceModeChange event.

The following example shows such an event notification in the JSON format: 

{
    "ver": "1.0",
    "id": "2256A988-0B26-4E2B-820A-8A0580D0B8E5",
    "product": "ECS",
    "resourceId": "acs:ecs:cn-hangzhou:169070********30:instance/i-bp1ecr********5go2go",
    "level": "INFO",
    "name": "Instance:PerformanceModeChange",
    "userId": "169070********30",
    "eventTime": "20190409T121826.922+0800",
    "regionId": "cn-hangzhou",
    "content": {
        "instanceId" : "i-bp1ecr********5go2go",
        "creditSpecification" : "Unlimited",
        "operator" : "System"
    }
}
The following table describes the subparameters contained in the content parameter.
Subparameter Description Example
instanceId The ID of the instance. i-bp1ecr********5go2go
creditSpecification The new performance mode of the burstable instance. Valid values:
  • Standard: standard mode
  • Unlimited: unlimited mode
Standard
operator The operator that triggers the event. Valid values:
  • User: The performance mode of the instance is manually changed by the user from the ECS console or by calling API operations.
  • System: The performance mode of the instance is automatically changed by the system. The performance mode of your burstable instance may be automatically changed if the instance depletes its CPU credits, if the economical mode is triggered, or if you have overdue payments in your account. For more information, see Switch the performance mode of a burstable instance.
User

Limited performance of burstable instances

When a burstable instance depletes its CPU credits, the instance is limited to its baseline performance and runs in standard mode. An Instance:BurstablePerformanceRestricted event is generated.
Note Each Instance:BurstablePerformanceRestricted event spans a period of 1 hour. That means that the interval between the start time and end time of the event is 1 hour. This event indicates only that the instance gets limited to its baseline performance for some duration of the event period but not necessarily the entire event period. If the instance remains limited to its baseline performance for an extended period of time, an Instance:BurstablePerformanceRestricted event is generated every hour.

The following example shows such an event notification in the JSON format: 

{
    "ver": "1.0",
    "id": "2256A988-0B26-4E2B-820A-8A0580D0B8E5",
    "product": "ECS",
    "resourceId": "acs:ecs:cn-hangzhou:169070********30:instance/i-bp1ecr********5go2go",
    "level": "INFO",
    "name": "Instance:BurstablePerformanceRestricted",
    "userId": "169070********30",
    "eventTime": "20190409T121826.922+0800",
    "regionId": "cn-hangzhou",
    "content": {
        "instanceId" : "i-bp1ecr********5go2go",
        "intervalStart" : "2019-11-11T11:00Z",
        "intervalEnd" : "2019-11-11T12:00Z"
    }
}
The following table describes the subparameters contained in the content parameter.
Subparameter Description Example
instanceId The ID of the instance. i-bp1ecr********5go2go
intervalStart The start time of the event. The time is in UTC. 2019-11-11T11:00Z
intervalEnd The end time of the event. The time is in UTC. 2019-11-11T12:00Z

Appendix: Notifications for instance-related system events

Impact Event type and code Event notification name and code
The instance is restarted. Instance restart due to system maintenance: SystemMaintenance.Reboot
  • Instance restart scheduled (system maintenance): Instance:SystemMaintenance.Reboot:Scheduled
  • Scheduled instance restart being executed (system maintenance): Instance:SystemMaintenance.Reboot:Executing
  • Scheduled instance restart completed (system maintenance): Instance:SystemMaintenance.Reboot:Executed
  • Scheduled instance restart avoided (system maintenance): Instance:SystemMaintenance.Reboot:Avoided
  • Scheduled instance restart canceled (system maintenance): Instance:SystemMaintenance.Reboot:Canceled
  • Scheduled instance restart failed (system maintenance): Instance:SystemMaintenance.Reboot:Failed
The instance is unexpectedly restarted. Instance restart due to system errors: SystemFailure.Reboot
  • Instance restart being executed (system error): Instance:SystemFailure.Reboot:Executing
  • Instance restart completed (system error): Instance:SystemFailure.Reboot:Executed
The instance is unexpectedly restarted. Instance restart due to instance errors: InstanceFailure.Reboot
  • Instance restart being executed (instance error): Instance:InstanceFailure.Reboot:Executing
  • Instance restart completed (instance error): Instance:InstanceFailure.Reboot:Executed
The instance is redeployed. Instance redeployment due to system maintenance: SystemMaintenance.Redeploy
  • Instance redeployment scheduled (system maintenance): Instance:SystemMaintenance.Redeploy:Scheduled
  • Scheduled instance redeployment being executed (system maintenance): Instance:SystemMaintenance.Redeploy:Executing
  • Scheduled instance redeployment completed (system maintenance): Instance:SystemMaintenance.Redeploy:Executed
  • Scheduled instance redeployment avoided (system maintenance): Instance:SystemMaintenance.Redeploy:Avoided
  • Scheduled instance redeployment canceled (system maintenance): Instance:SystemMaintenance.Redeploy:Canceled
The instance is redeployed. Instance redeployment due to system errors: SystemFailure.Redeploy
  • Instance redeployment scheduled (system error): Instance:SystemFailure.Redeploy:Scheduled
  • Instance redeployment being executed (system error): Instance:SystemFailure.Redeploy:Executing
  • Instance redeployment completed (system error): Instance:SystemFailure.Redeploy:Executed
  • Instance redeployment avoided (system error): Instance:SystemFailure.Redeploy:Avoided
  • Instance redeployment canceled (system error): Instance:SystemFailure.Redeploy:Canceled
The instance is restarted and the damaged local disk is isolated. Instance restart and local disk replacement due to system maintenance: SystemMaintenance.RebootAndIsolateErrorDisk
  • Instance restart and local disk isolation being inquired (system maintenance): Instance:SystemMaintenance.RebootAndIsolateErrorDisk:Inquiring
  • Instance restart and local disk isolation being executed (system maintenance): Instance:SystemMaintenance.RebootAndIsolateErrorDisk:Executing
  • Instance restart and local disk isolation completed (system maintenance): Instance:SystemMaintenance.RebootAndIsolateErrorDisk:Executed
  • Instance restart and local disk isolation avoided (system maintenance): Instance:SystemMaintenance.RebootAndIsolateErrorDisk:Avoided
  • Instance restart and local disk isolation canceled (system maintenance): Instance:SystemMaintenance.RebootAndIsolateErrorDisk:Canceled
The instance is restarted and the damaged local disk is restored. Instance restart and local disk re-initialization due to system maintenance: SystemMaintenance.RebootAndReInitErrorDisk
  • Instance restart and local disk re-initialization being inquired (system maintenance): Instance:SystemMaintenance.RebootAndReInitErrorDisk:Inquiring
  • Instance restart and local disk re-initialization being executed (system maintenance): Instance:SystemMaintenance.RebootAndReInitErrorDisk:Executing
  • Instance restart and local disk re-initialization completed (system maintenance): Instance:SystemMaintenance.RebootAndReInitErrorDisk:Executed
  • Instance restart and local disk re-initialization avoided (system maintenance): Instance:SystemMaintenance.RebootAndReInitErrorDisk:Avoided
  • Instance restart and local disk re-initialization canceled (system maintenance): Instance:SystemMaintenance.RebootAndReInitErrorDisk:Canceled
The instance is released. Automatic instance release due to instance creation failures: SystemFailure.Delete
  • Automatic instance release being executed (instance creation failure): Instance:SystemFailure.Delete:Executing
  • Automatic instance release completed (instance creation failure): Instance:SystemFailure.Delete:Executed
  • Automatic instance release avoided (instance creation failure): Instance:SystemFailure.Delete:Avoided