Elastic Compute Service:Retain and restore data for preemptible instances

Procedure

1. Log on to the ECS console, go to the instance buy page, and then click the Custom Launch tab.

2. Follow the on-screen instructions to configure the instance parameters based on your business requirements. Take note of the following parameters. For information about other parameters, see Create an instance on the Custom Launch tab.

   • Billing Method: Select Preemptible Instance.

   • Instance Interruption Mode: Select Stop in Economical Mode.

   Note

   • After a preemptible instance is stopped in economical mode, the computing resources (vCPUs, GPUs, and memory), static public IP address, and public bandwidth associated with the static public IP address of the instance are reclaimed and no longer billed. The billing for other resources of the preemptible instance continues, such as the cloud disks (system disk and data disks), elastic IP addresses (if any), and snapshots.

   • If you call the RunInstances operation to create preemptible instances, set the SpotInterruptionBehavior parameter to Stop to enable the economical mode for the instances.

Procedure

1. After you receive an interruption and reclamation notification for a preemptible instance, the instance is stopped in economical mode in 5 minutes. You can view the status of the preemptible instance on the ECS console - Instance page.

   

2. After the preemptible instance is stopped in economical mode, start the instance when the market price does not exceed the bid price and the inventory is sufficient. You can also call the StartInstance or StartInstances operation to start the instance.

   

   Note

   • To query the market price, go to the instance buy page, select the instance type of the preemptible instance, and then view the price history of the instance type. You can also call the DescribeSpotPriceHistory operation to view the price history of the instance type.

   • To query the inventory, go to the instance buy page and select the preemptible instance type. If you can create a new preemptible instance, the instance type is in stock. You can also call the DescribeAvailableResource operation to query the inventory.

Flowchart

Retain data

Considerations

• The disks that you want to attach to a new instance are in the Unattached (Available) state.

• The instance to which you want to attach the disks is in the Running (Running) or Stopped (Stopped) state and not in the Locked (Locked) state.

Procedure

• Attach the system disk to another instance as a data disk for repair.

• Attach the data disks to another instance.

Procedure

This section describes how to create a snapshot for a cloud disk on the Instance page in the ECS console. You can also create a snapshot for a cloud disk on the Snapshots or Block Storage page.

1. Go to the ECS console - Instance page.

2. In the top navigation bar, select the region and resource group of the resource that you want to manage.

3. Click the ID of the instance from which you want to create a snapshot. On the instance details page, click All Actions in the upper-right corner. In the pane that appears, search for and click Create Snapshot.

4. In the Create Snapshot dialog box, configure the snapshot parameters and click OK.

   Parameter		Description
   Resource Type		The default selection is Cloud Disk, which allows you to create a snapshot for a single disk. Note You can also select Instance to select one or more disks from the instance, create a snapshot-consistent group, and then create snapshots for multiple disks in the group to ensure data consistency across multiple disks. For more information, see Create a snapshot-consistent group.
   Disk		Select the disk for which you want to create a snapshot. You can select a system disk or a data disk.
   Snapshot Name		Specify a name for the snapshot.
   Retention Period		Set the retention period for the snapshot. You can choose to retain it permanently or specify a custom number of days. Permanently: After the maximum number of snapshots is reached, new snapshots cannot be created. Custom retention period: The snapshot will be automatically deleted by the system after the retention period expires. Note For the upper limit of manually created snapshots, see Snapshot overview. If you choose a custom retention period, when the retention period is 3 days away from expiration, the Retention Period column in the snapshot list will highlight Released After Xx Days. You can extend the retention period before the snapshot expires as needed. For more information, see Extend the retention period of a snapshot. Regardless of whether the retention period is permanent or custom, if you no longer need the snapshot, it is recommended to delete it promptly to avoid incurring ongoing snapshot fees. For more information, see Delete a snapshot.
   Advanced Settings	Instant Access	ESSD series disks (ESSDs, ESSD AutoPL disks, ESSD Entry disks, and Regional ESSDs) have the instant access feature enabled by default. Other categories of disks do not have this feature enabled by default. Note The instant access feature allows snapshots to be available within seconds after creation, without waiting for the snapshot to be uploaded to OSS. You can use the snapshot immediately for operations such as rolling back disks, creating new disks, or sharing snapshots. For more information, see Use the instant access feature.
   	Tag	Set the tag key-value pairs for the snapshot. You can use the tag feature to manage resources in a unified manner.
   	Resource Group	Set the resource group to which the snapshot belongs. You can use resource groups to manage snapshots at different levels.

5. (Optional) View the creation progress of the snapshot on the Disk Snapshots tab.

   

   • In the Progress column, view the upload progress of the snapshot to OSS. When you move your pointer over Progress of Upload to OSS: xx%, the system displays the estimated remaining time for the upload.

     Note

     • The estimated remaining time to upload a snapshot to OSS dynamically varies based on multiple factors. For more information, see the Considerations section of the "Create a snapshot" topic.

     • You can call the DeleteSnapshot operation to cancel an ongoing snapshot creation task.

   • If Progress of Upload to OSS: 100% is displayed, the snapshot is uploaded to OSS. The disk data is backed up.

6. Click the ID of the preemptible instance to go to the instance details page. In the upper-right corner of the page, click All Actions. In the pane that appears, search for and click Create Custom Image.

7. In the Create Custom Image dialog box, configure the parameters and click OK.

   The time required to create an image varies based on the disk size. You must wait until the snapshot of each disk is created before you can use the image.

Procedure

1. Go to the ECS console - Images page.

2. In the top navigation bar, select the region and resource group of the resource that you want to manage.

3. Find the image that you want to use and click Create Instance in the Actions column.

   

4. On the Custom Launch tab, click the Custom Images tab in the Image section. Verify that the custom image created from the preemptible instance in the previous step is selected. For information about other parameters, see Create an instance on the Custom Launch tab.