Define event windows for scheduled events - Amazon Elastic Compute Cloud
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Define event windows for scheduled events

You can define custom event windows that recur weekly for scheduled events that reboot, stop, or terminate your Amazon EC2 instances. You can associate one or more instances with an event window. If a scheduled event for those instances is planned, Amazon will schedule the events within the associated event window.

You can use event windows to maximize workload availability by specifying event windows that occur during off-peak periods for your workload. You can also align the event windows with your internal maintenance schedules.

You define an event window by specifying a set of time ranges. The minimum time range is 2 hours. The combined time ranges must total at least 4 hours.

You can associate one or more instances with an event window by using either instance IDs or instance tags. You can also associate Dedicated Hosts with an event window by using the host ID.

Warning

Event windows are applicable only for scheduled events that stop, reboot, or terminate instances.

Event windows are not applicable for:

  • Expedited scheduled events and network maintenance events.

  • Unscheduled maintenance such as AutoRecovery and unplanned reboots.

Considerations

  • All event window times are in UTC.

  • The minimum weekly event window duration is 4 hours.

  • The time ranges within an event window must each be at least 2 hours.

  • Only one target type (instance ID, Dedicated Host ID, or instance tag) can be associated with an event window.

  • A target (instance ID, Dedicated Host ID, or instance tag) can only be associated with one event window.

  • A maximum of 100 instance IDs, or 50 Dedicated Host IDs, or 50 instance tags can be associated with an event window. The instance tags can be associated with any number of instances.

  • A maximum of 200 event windows can be created per Amazon Region.

  • Multiple instances that are associated with event windows can potentially have scheduled events occur at the same time.

  • If Amazon has already scheduled an event, modifying an event window won't change the time of the scheduled event. If the event has a deadline date, you can reschedule the event.

  • You can stop and start an instance prior to the scheduled event, which migrates the instance to a new host, and the scheduled event will no longer take place.

View event windows

You can view event windows by using one of the following methods.

Console
To view event windows

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. In the navigation pane, choose Events.

  3. Choose Actions, Manage event windows.

  4. Select an event window to view its details.

Amazon CLI
To describe all event windows

Use the describe-instance-event-windows command.

aws ec2 describe-instance-event-windows \
    --region us-east-1

Expected output

{
    "InstanceEventWindows": [
        {
            "InstanceEventWindowId": "iew-0abcdef1234567890",
            "Name": "myEventWindowName",
            "CronExpression": "* 21-23 * * 2,3",
            "AssociationTarget": {
                "InstanceIds": [
                    "i-1234567890abcdef0",
                    "i-0598c7d356eba48d7"
                ],
                "Tags": [],
                "DedicatedHostIds": []
            },
            "State": "active",
            "Tags": []
        }
        
        ...
        
    ],
    "NextToken": "9d624e0c-388b-4862-a31e-a85c64fc1d4a"
}
To describe a specific event window

Use the describe-instance-event-windows command with the --instance-event-window-id parameter to describe a specific event window.

aws ec2 describe-instance-event-windows \
    --region us-east-1 \
    --instance-event-window-id iew-0abcdef1234567890
To describe event windows that match one or more filters

Use the describe-instance-event-windows command with the --filters parameter. In the following example, the instance-id filter is used to describe all of the event windows that are associated with the specified instance.

When a filter is used, it performs a direct match. However, the instance-id filter is different. If there is no direct match to the instance ID, then it falls back to indirect associations with the event window, such as the instance's tags or Dedicated Host ID (if the instance is on a Dedicated Host).

For the list of supported filters, see describe-instance-event-windows in the Amazon CLI Reference.

aws ec2 describe-instance-event-windows \
    --region us-east-1 \
    --filters Name=instance-id,Values=i-1234567890abcdef0 \
    --max-results 100 \
    --next-token <next-token-value>

Expected output

In the following example, the instance is on a Dedicated Host, which is associated with the event window.

{
    "InstanceEventWindows": [
        {
            "InstanceEventWindowId": "iew-0dbc0adb66f235982",
            "TimeRanges": [
                {
                    "StartWeekDay": "sunday",
                    "StartHour": 2,
                    "EndWeekDay": "sunday",
                    "EndHour": 8
                }
            ],
            "Name": "myEventWindowName",
            "AssociationTarget": {
                "InstanceIds": [],
                "Tags": [],
                "DedicatedHostIds": [
                    "h-0140d9a7ecbd102dd"
                ]
            },
            "State": "active",
            "Tags": []
        }
    ]
}

Create event windows

You can create one or more event windows. For each event window, you specify one or more blocks of time. For example, you can create an event window with blocks of time that occur every day at 4 AM for 2 hours. Or you can create an event window with blocks of time that occur on Sundays from 2 AM to 4 AM and on Wednesdays from 3 AM to 5 AM.

For the event window constraints, see Considerations earlier in this topic.

Event windows recur weekly until you delete them.

Use one of the following methods to create an event window.

Console
To create an event window

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. In the navigation pane, choose Events.

  3. Choose Actions, Manage event windows.

  4. Choose Create instance event window.

  5. For Event window name, enter a descriptive name for the event window.

  6. For Event window schedule, choose to specify the blocks of time in the event window by using the cron schedule builder or by specifying time ranges.

    • If you choose Cron schedule builder, specify the following:

      1. For Days (UTC), specify the days of the week on which the event window occurs.

      2. For Start time (UTC), specify the time when the event window begins.

      3. For Duration, specify the duration of the blocks of time in the event window. The minimum duration per block of time is 2 hours. The minimum duration of the event window must equal or exceed 4 hours in total. All times are in UTC.

    • If you choose Time ranges, choose Add new time range and specify the start day and time and the end day and time. Repeat for each time range. The minimum duration per time range is 2 hours. The minimum duration for all time ranges combined must equal or exceed 4 hours in total.

  7. (Optional) For Target details, associate one or more instances with the event window so that if the instances are scheduled for maintenance, the scheduled event will occur during the associated event window. You can associate one or more instances with an event window by using instance IDs or instance tags. You can associate Dedicated Hosts with an event window by using the host ID.

    Note that you can create the event window without associating a target with the window. Later, you can modify the window to associate one or more targets.

  8. (Optional) For Event window tags, choose Add tag, and enter the key and value for the tag. Repeat for each tag.

  9. Choose Create event window.

Amazon CLI

To create an event window using the Amazon CLI, you first create the event window, and then you associate one or more targets with the event window.

Create an event window

You can define either a set of time ranges or a cron expression when creating the event window, but not both.

To create an event window with a time range

Use the create-instance-event-window command and specify the --time-range parameter. You can't also specify the --cron-expression parameter.

aws ec2 create-instance-event-window \
    --region us-east-1 \
    --time-range StartWeekDay=monday,StartHour=2,EndWeekDay=wednesday,EndHour=8 \
    --tag-specifications "ResourceType=instance-event-window,Tags=[{Key=K1,Value=V1}]" \
    --name myEventWindowName

Expected output

{
    "InstanceEventWindow": {
        "InstanceEventWindowId": "iew-0abcdef1234567890",
        "TimeRanges": [
            {
                "StartWeekDay": "monday",
                "StartHour": 2,
                "EndWeekDay": "wednesday",
                "EndHour": 8
            }
        ],
        "Name": "myEventWindowName",
        "State": "creating",
        "Tags": [
            {
                "Key": "K1",
                "Value": "V1"
            }
        ]
    }
}
To create an event window with a cron expression

Use the create-instance-event-window command and specify the --cron-expression parameter. You can't also specify the --time-range parameter.

aws ec2 create-instance-event-window \
    --region us-east-1 \
    --cron-expression "* 21-23 * * 2,3" \
    --tag-specifications "ResourceType=instance-event-window,Tags=[{Key=K1,Value=V1}]" \
    --name myEventWindowName

Expected output

{
    "InstanceEventWindow": {
        "InstanceEventWindowId": "iew-0abcdef1234567890",
        "Name": "myEventWindowName",
        "CronExpression": "* 21-23 * * 2,3",
        "State": "creating",
        "Tags": [
            {
                "Key": "K1",
                "Value": "V1"
            }
        ]
    }
}
Associate a target with an event window

You can associate only one type of target (instance IDs, Dedicated Host IDs, or instance tags) with an event window.

To associate instance tags with an event window

Use the associate-instance-event-window command and specify the instance-event-window-id parameter to specify the event window. To associate instance tags, specify the --association-target parameter, and for the parameter values, specify one or more tags.

aws ec2 associate-instance-event-window \
    --region us-east-1 \
    --instance-event-window-id iew-0abcdef1234567890 \
    --association-target "InstanceTags=[{Key=k2,Value=v2},{Key=k1,Value=v1}]"

Expected output

{
    "InstanceEventWindow": {
        "InstanceEventWindowId": "iew-0abcdef1234567890",
        "Name": "myEventWindowName",
        "CronExpression": "* 21-23 * * 2,3",
        "AssociationTarget": {
            "InstanceIds": [],
            "Tags": [
                {
                    "Key": "k2",
                    "Value": "v2"
                },
                {
                    "Key": "k1",
                    "Value": "v1"
                }
            ],
            "DedicatedHostIds": []
        },
        "State": "creating"
    }
}
To associate one or more instances with an event window

Use the associate-instance-event-window command and specify the instance-event-window-id parameter to specify the event window. To associate instances, specify the --association-target parameter, and for the parameter values, specify one or more instance IDs.

aws ec2 associate-instance-event-window \
    --region us-east-1 \
    --instance-event-window-id iew-0abcdef1234567890 \
    --association-target "InstanceIds=i-1234567890abcdef0,i-0598c7d356eba48d7"

Expected output

{
    "InstanceEventWindow": {
        "InstanceEventWindowId": "iew-0abcdef1234567890",
        "Name": "myEventWindowName",
        "CronExpression": "* 21-23 * * 2,3",
        "AssociationTarget": {
            "InstanceIds": [
                "i-1234567890abcdef0",
                "i-0598c7d356eba48d7"
            ],
            "Tags": [],
            "DedicatedHostIds": []
        },
        "State": "creating"
    }
}
To associate a Dedicated Host with an event window

Use the associate-instance-event-window command and specify the instance-event-window-id parameter to specify the event window. To associate a Dedicated Host, specify the --association-target parameter, and for the parameter values, specify one or more Dedicated Host IDs.

aws ec2 associate-instance-event-window \
    --region us-east-1 \
    --instance-event-window-id iew-0abcdef1234567890 \
    --association-target "DedicatedHostIds=h-029fa35a02b99801d"

Expected output

{
    "InstanceEventWindow": {
        "InstanceEventWindowId": "iew-0abcdef1234567890",
        "Name": "myEventWindowName",
        "CronExpression": "* 21-23 * * 2,3",
        "AssociationTarget": {
            "InstanceIds": [],
            "Tags": [],
            "DedicatedHostIds": [
                "h-029fa35a02b99801d"
            ]
        },
        "State": "creating"
    }
}

Modify event windows

You can modify all of the fields of an event window except its ID. For example, when daylight savings begin, you might want to modify the event window schedule. For existing event windows, you might want to add or remove targets.

Use one of the following methods to modify an event window.

Console
To modify an event window

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. In the navigation pane, choose Events.

  3. Choose Actions, Manage event windows.

  4. Select the event window to modify, and then choose Actions, Modify instance event window.

  5. Modify the fields in the event window, and then choose Modify event window.

Amazon CLI

To modify an event window using the Amazon CLI, you can modify the time range or cron expression, and associate or disassociate one or more targets with the event window.

Modify the event window time

You can modify either a time range or a cron expression when modifying the event window, but not both.

To modify the time range of an event window

Use the modify-instance-event-window command and specify the event window to modify. Specify the --time-range parameter to modify the time range. You can't also specify the --cron-expression parameter.

aws ec2 modify-instance-event-window \
    --region us-east-1 \
    --instance-event-window-id iew-0abcdef1234567890 \
    --time-range StartWeekDay=monday,StartHour=2,EndWeekDay=wednesday,EndHour=8

Expected output

{
    "InstanceEventWindow": {
        "InstanceEventWindowId": "iew-0abcdef1234567890",
        "TimeRanges": [
            {
                "StartWeekDay": "monday",
                "StartHour": 2,
                "EndWeekDay": "wednesday",
                "EndHour": 8
            }
        ],
        "Name": "myEventWindowName",
        "AssociationTarget": {
            "InstanceIds": [
                "i-0abcdef1234567890",
                "i-0be35f9acb8ba01f0"
            ],
            "Tags": [],
            "DedicatedHostIds": []
        },
        "State": "creating",
        "Tags": [
            {
                "Key": "K1",
                "Value": "V1"
            }
        ]
    }
}
To modify a set of time ranges for an event window

Use the modify-instance-event-window command and specify the event window to modify. Specify the --time-range parameter to modify the time range. You can't also specify the --cron-expression parameter in the same call.

aws ec2 modify-instance-event-window \
    --region us-east-1 \
    --instance-event-window-id iew-0abcdef1234567890 \
    --time-range '[{"StartWeekDay": "monday", "StartHour": 2, "EndWeekDay": "wednesday", "EndHour": 8},
	  {"StartWeekDay": "thursday", "StartHour": 2, "EndWeekDay": "friday", "EndHour": 8}]'

Expected output

{
    "InstanceEventWindow": {
        "InstanceEventWindowId": "iew-0abcdef1234567890",
        "TimeRanges": [
            {
                "StartWeekDay": "monday",
                "StartHour": 2,
                "EndWeekDay": "wednesday",
                "EndHour": 8
            },
            {
                "StartWeekDay": "thursday",
                "StartHour": 2,
                "EndWeekDay": "friday",
                "EndHour": 8
            }
        ],
        "Name": "myEventWindowName",
        "AssociationTarget": {
            "InstanceIds": [
                "i-0abcdef1234567890",
                "i-0be35f9acb8ba01f0"
            ],
            "Tags": [],
            "DedicatedHostIds": []
        },
        "State": "creating",
        "Tags": [
            {
                "Key": "K1",
                "Value": "V1"
            }
        ]
    }
}
To modify the cron expression of an event window

Use the modify-instance-event-window command and specify the event window to modify. Specify the --cron-expression parameter to modify the cron expression. You can't also specify the --time-range parameter.

aws ec2 modify-instance-event-window \
    --region us-east-1 \
    --instance-event-window-id iew-0abcdef1234567890 \
    --cron-expression "* 21-23 * * 2,3"

Expected output

{
    "InstanceEventWindow": {
        "InstanceEventWindowId": "iew-0abcdef1234567890",
        "Name": "myEventWindowName",
        "CronExpression": "* 21-23 * * 2,3",
        "AssociationTarget": {
            "InstanceIds": [
                "i-0abcdef1234567890",
                "i-0be35f9acb8ba01f0"
            ],
            "Tags": [],
            "DedicatedHostIds": []
        },
        "State": "creating",
        "Tags": [
            {
                "Key": "K1",
                "Value": "V1"
            }
        ]
    }
}
Modify the targets associated with an event window

You can associate additional targets with an event window. You can also disassociate existing targets from an event window. However, only one type of target (instance IDs, Dedicated Host IDs, or instance tags) can be associated with an event window.

To associate additional targets with an event window

For the instructions on how to associate targets with an event window, see Associate a target with an event window.

To disassociate instance tags from an event window

Use the disassociate-instance-event-window command and specify the instance-event-window-id parameter to specify the event window. To disassociate instance tags, specify the --association-target parameter, and for the parameter values, specify one or more tags.

aws ec2 disassociate-instance-event-window \
    --region us-east-1 \
    --instance-event-window-id iew-0abcdef1234567890 \
    --association-target "InstanceTags=[{Key=k2,Value=v2},{Key=k1,Value=v1}]"

Expected output

{
    "InstanceEventWindow": {
        "InstanceEventWindowId": "iew-0abcdef1234567890",
        "Name": "myEventWindowName",
        "CronExpression": "* 21-23 * * 2,3",
        "AssociationTarget": {
            "InstanceIds": [],
            "Tags": [],
            "DedicatedHostIds": []
        },
        "State": "creating"
    }
}
To disassociate one or more instances from an event window

Use the disassociate-instance-event-window command and specify the instance-event-window-id parameter to specify the event window. To disassociate instances, specify the --association-target parameter, and for the parameter values, specify one or more instance IDs.

aws ec2 disassociate-instance-event-window \
    --region us-east-1 \
    --instance-event-window-id iew-0abcdef1234567890 \
    --association-target "InstanceIds=i-1234567890abcdef0,i-0598c7d356eba48d7"

Expected output

{
    "InstanceEventWindow": {
        "InstanceEventWindowId": "iew-0abcdef1234567890",
        "Name": "myEventWindowName",
        "CronExpression": "* 21-23 * * 2,3",
        "AssociationTarget": {
            "InstanceIds": [],
            "Tags": [],
            "DedicatedHostIds": []
        },
        "State": "creating"
    }
}
To disassociate a Dedicated Host from an event window

Use the disassociate-instance-event-window command and specify the instance-event-window-id parameter to specify the event window. To disassociate a Dedicated Host, specify the --association-target parameter, and for the parameter values, specify one or more Dedicated Host IDs.

aws ec2 disassociate-instance-event-window \
    --region us-east-1 \
    --instance-event-window-id iew-0abcdef1234567890 \
    --association-target DedicatedHostIds=h-029fa35a02b99801d

Expected output

{
    "InstanceEventWindow": {
        "InstanceEventWindowId": "iew-0abcdef1234567890",
        "Name": "myEventWindowName",
        "CronExpression": "* 21-23 * * 2,3",
        "AssociationTarget": {
            "InstanceIds": [],
            "Tags": [],
            "DedicatedHostIds": []
        },
        "State": "creating"
    }
}

Delete event windows

You can delete one event window at a time by using one of the following methods.

Console
To delete an event window

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. In the navigation pane, choose Events.

  3. Choose Actions, Manage event windows.

  4. Select the event window to delete, and then choose Actions, Delete instance event window.

  5. When prompted, enter delete, and then choose Delete.

Amazon CLI
To delete an event window

Use the delete-instance-event-window command and specify the event window to delete.

aws ec2 delete-instance-event-window \
    --region us-east-1 \
    --instance-event-window-id iew-0abcdef1234567890
To force delete an event window

Use the --force-delete parameter if the event window is currently associated with targets.

aws ec2 delete-instance-event-window \
    --region us-east-1 \
    --instance-event-window-id iew-0abcdef1234567890 \
    --force-delete

Expected output

{
    "InstanceEventWindowState": {
        "InstanceEventWindowId": "iew-0abcdef1234567890",
        "State": "deleting"
    }
}

Tag event windows

You can tag an event window when you create it, or afterwards.

To tag an event window when you create it, see Create event windows.

Use one of the following methods to tag an event window.

Console
To tag an existing event window

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. In the navigation pane, choose Events.

  3. Choose Actions, Manage event windows.

  4. Select the event window to tag, and then choose Actions, Manage instance event window tags.

  5. Choose Add tag to add a tag. Repeat for each tag.

  6. Choose Save.

Amazon CLI
To tag an existing event window

Use the create-tags command to tag existing resources. In the following example, the existing event window is tagged with Key=purpose and Value=test.

aws ec2 create-tags \
    --resources iew-0abcdef1234567890 \
    --tags Key=purpose,Value=test