Elastic Compute Service:ECS scheduled maintenance windows

Considerations

• When you use the ECS Scheduled Maintenance Window feature, we recommend that you do not configure maintenance windows for instance maintenance attributes.

• The start time and end time of each time range in the schedules of ECS scheduled maintenance windows are in UTC. For a weekly (Every Week) schedule of an ECS scheduled maintenance window, the earliest start time is 00:00 on Sunday, and the end time of each time range must be later than the start time.

• The total duration of each ECS scheduled maintenance window must be at least 4 hours.

• You can associate an ECS scheduled maintenance window with only one of the following types of targets (ECS instances): All ECS instances in your account, ECS instances in a specific resource group, or ECS instances that have specific tags.

How does an ECS scheduled maintenance window work?

• O&M tasks related to events are executed based on ECS scheduled maintenance windows. If the execution schedule of a scheduled O&M event matches the schedule of an ECS scheduled maintenance window, the O&M task related to the event is executed based on the maintenance window.

  

• ECS scheduled maintenance windows do not take effect. If the execution schedule of a scheduled O&M event does not match the schedules of ECS scheduled maintenance windows, the O&M task related to the event is executed based on the execution schedule of the event. We recommend that you specify multiple time ranges in the schedule of an ECS scheduled maintenance window.

  

Maintenance actions of ECS scheduled maintenance windows

ECS scheduled maintenance windows support the Redeploy Instance and Restart Instance maintenance actions and use a mechanism where the high-priority maintenance action (Redeploy Instance) overrides the low-priority maintenance action (Restart Instance). When an ECS scheduled maintenance window that supports the high-priority maintenance action (Redeploy Instance) takes effect, O&M tasks related to SystemMaintenance.Reboot (Instance Restart Due to System Maintenance) events that match this maintenance window are automatically executed based on the maintenance window.

By default, scheduled ECS O&M events expire after 48 hours. To change the expiration period to 7 days, submit a ticket.

Create an ECS scheduled maintenance window

1. Go to ECS console - Events.

2. In the left-side navigation pane of the Events page, click Scheduled Maintenance Windows.

   

3. Click Create Maintenance Window.

4. In the Create Maintenance Window dialog box, configure the parameters described in the following table.

   Parameter	Description	Example
   Window Name	Specify a name for the ECS scheduled maintenance window. The name must be 2 to 200 characters in length and can contain letters, digits, colons (:), underscores (_), periods (.), and hyphens (-). To ensure that the full name is displayed, we recommend limiting the name to 64 characters. Duplicate names are allowed. To facilitate the management of the maintenance windows, we recommend keeping the window names unique.	Redis maintenance window
   Resource Scope	Select the scope of targets (ECS instances) with which to associate the ECS scheduled maintenance window. Each ECS scheduled maintenance window can be associated with only one type of targets. Valid values of this parameter: All: all ECS instances in your account. By Resource Group: all ECS instances in a specific resource group. By Instance Tags: all ECS instances that have specific tags in all regions in your account.	All
   Recurrence Frequency	Specify a daily or weekly schedule for the ECS scheduled maintenance window. Every Day: daily schedule. Every Week: weekly schedule.	Every Week
   Time Range	Define one or more time ranges in the schedule of ECS scheduled maintenance window. Note Specify one or more time ranges in the daily or weekly schedule. The start time and end time of each time range must be at least 4 hours apart.	Every Week: Start Time: Sunday 0:00 End Time: Monday 4:00 Every Day: Start Time: 0:00 End Time: 4:00
   Maintenance Action	Select a maintenance action that can be performed in response to events within the ECS scheduled maintenance window. Restart Instance: restarts ECS instances within the ECS scheduled maintenance window. The Restart Instance action can be performed in response to only SystemMaintenance.Reboot (Instance Restart Due to System Maintenance) events. Redeploy Instance: redeploys and restarts ECS instances within the ECS scheduled maintenance window. The Redeploy Instance action can be performed in response to SystemMaintenance.Reboot (Instance Restart Due to System Maintenance ) and SystemMaintenance.Redeploy (Instance Redeployment Due to System Maintenance) events.	Restart Instance
   Effectiveness	Enable or disable the ECS scheduled maintenance window. Turn on the switch to enable the ECS scheduled maintenance window. Turn off the switch to disable the ECS scheduled maintenance window.	Turn on the switch

   

5. Click Confirm.

Manage ECS scheduled maintenance windows

• View ECS scheduled maintenance windows. You can view the list of ECS scheduled maintenance windows on the Scheduled Maintenance Windows page, or click View Details in the Actions column to view the details of an ECS scheduled maintenance window.

• Modify an ECS scheduled maintenance window. Find the ECS scheduled maintenance window that you want to modify, click Edit in the Actions column, and then modify the configurations of the maintenance window based on your business requirements.

• Delete an ECS scheduled maintenance window. If you no longer require specific ECS scheduled maintenance windows or the schedules of multiple ECS scheduled maintenance windows overlap, delete redundant or unnecessary maintenance windows. Find the ECS scheduled maintenance window that you want to delete and click Delete in the Actions column.