ALIYUN::ESS::ScalingGroup is used to create a scaling group. A scaling group is a group of ECS instances that are dynamically scaled based on the configured scenario. A scaling group does not take effect immediately after it is created. You must use ALIYUN::ESS::ScalingGroupEnable to enable the scaling group to trigger scaling rules and execute scaling activities.

Syntax

{
  "Type": "ALIYUN::ESS::ScalingGroup",
  "Properties": {
    "MultiAZPolicy": String,
    "DesiredCapacity": Integer,
    "NotificationConfigurations": List,
    "ProtectedInstances": List,
    "LaunchTemplateId": String,
    "LaunchTemplateVersion": String,
    "ScalingGroupName": String,
    "VSwitchIds": List,
    "DefaultCooldown": Integer,
    "MinSize": Integer,
    "GroupDeletionProtection": Boolean,
    "MaxSize": Integer,
    "InstanceId": String,
    "VSwitchId": String,
    "LoadBalancerIds": List,
    "StandbyInstances": List,
    "RemovalPolicys": List,
    "HealthCheckType": String,
    "DBInstanceIds": List,
    "Tags": List
  }
}

Properties

Property Type Required Editable Description Constraint
MinSize Integer Yes Yes The minimum number of ECS instances in the scaling group.

Valid values: 0 to 1000.

When the number of ECS instances in the scaling group is smaller than the value of MinSize, Auto Scaling creates ECS instances till the number of instances is equal to the MinSize value.

MaxSize Integer Yes Yes The maximum number of ECS instances in the scaling group.

Valid values: 0 to 1000.

When the number of ECS instances in the scaling group is greater than the MaxSize value, Auto Scaling removes ECS instances from the scaling group till the number of instances is equal to the MaxSize value.

ScalingGroupName String No Yes The display name of the scaling group. The name must be 2 to 64 characters in length and can contain letters, digits, underscores (_), hyphens (-), and periods (.). It must start with a letter or digit.

The name must be unique to an Alibaba Cloud account within a region.

The default value is the ID of the scaling group.
LaunchTemplateId String No Yes The ID of the instance launch template from which the scaling group obtains launch configurations. None
LaunchTemplateVersion String No Yes The version of the instance launch template. Valid values:
  • The fixed template version number.
  • Default: The default template version is always used.
  • Latest: The latest template version is always used.
RemovalPolicys List No Yes The policies that are used to remove ECS instances from the scaling group. Default value: OldestScalingConfiguration or OldestInstance. Valid values:
  • OldestInstance: removes the ECS instance that is added to the scaling group at the earliest point in time.
  • NewestInstance: removes the ECS instance that is added to the scaling group at the latest point in time.
  • OldestScalingConfiguration: removes the ECS instance that is created based on the earliest scaling configuration.
VSwitchId String No No The ID of the vSwitch. None
LoadBalancerIds List No Yes The ID of the Server Load Balancer (SLB) instance. This value can be a JSON array that consists of up to five SLB instance IDs. Separate multiple IDs with commas (,).
DefaultCooldown Integer No Yes The cooldown time after a scaling activity (adding or removing ECS instances) is executed.
  • Valid values: 0 to 86400.
  • Unit: seconds.
  • Default value: 300.

During the cooldown time, the scaling group executes only scaling activities that are triggered by CloudMonitor event-triggered tasks.

DBInstanceIds List No Yes The IDs of ApsaraDB RDS instances. This value can be a JSON array that contains up to eight ApsaraDB RDS instance IDs. Separate multiple IDs with commas (,).
VSwitchIds List No No The IDs of vSwitches. You can specify up to five vSwitch IDs. If you specify this parameter, the VSwitchId parameter is ignored. vSwitches are sorted in descending order of priority. When an ECS instance cannot be created in the zone where the vSwitch that has the highest priority resides, the system uses the vSwitch that has the next highest priority to create the instance.
MultiAZPolicy String No No The ECS instance scaling policy for the multi-zone scaling group. Valid values:
  • PRIORITY: ECS instances are scaled based on the specified vSwitch. When an ECS instance cannot be created in the zone where the vSwitch that has the highest priority resides, the system uses the vSwitch that has the next highest priority to create the instance.
  • BALANCE: ECS instances are evenly distributed in multiple zones specified in the scaling group.
  • COST_OPTIMIZED: ECS instances are created based on the unit price of vCPUs, from low to high. Preemptible instances are created first when preemptible instance types are specified for the scaling configuration. Pay-as-you-go instances are created when no preemptible instances are available due to issues such as insufficient ECS resources.
NotificationConfigurations List No Yes The notification configurations for event and resource changes. For more information, see the NotificationConfigurations properties section in this topic.
ProtectedInstances List No Yes The number of protected ECS instances in the scaling group. Maximum value: 1000.
StandbyInstances List No Yes The number of ECS instances that are in the standby state in the scaling group. Maximum value: 1000.
HealthCheckType String No Yes The health check type. Valid values:
  • ECS
  • NONE
GroupDeletionProtection Boolean No Yes Specifies whether to enable deletion protection for the scaling group. Default value: false. Valid values:
  • true: Deletion protection is enabled for the scaling group. In this case, you cannot delete the scaling group.
  • false: Deletion protection is disabled for the scaling group.
DesiredCapacity Integer No Yes The expected number of ECS instances in the scaling group. The scaling group automatically keeps the number of ECS instances at the expected value. The expected number must be greater than or equal to the value of MinSize and less than or equal to the value of MaxSize.
InstanceId String No No The ID of the ECS instance from which the scaling group obtains configuration information to create scaling configurations. None
Tags List No Yes The tags of the scaling group. A maximum of 20 tags can be specified.

For more information, see the Tags properties section in this topic.

NotificationConfigurations syntax

"NotificationConfigurations": [
  {
    "NotificationArn": String,
    "NotificationTypes": List
  }
]

NotificationConfigurations properties

Property Type Required Editable Description Constraint
NotificationArn String Yes No The Alibaba Cloud Resource Name (ARN) of the notification object that Auto Scaling uses to notify you when an instance is in the transition state for the lifecycle hook. This object can be an MNS queue or an MNS topic. Format:
  • MNS queue: acs:ess:{region}:{account-id}:queue/{queuename}
  • MNS topic: acs:ess:{region}:{account-id}:topic/{topicname}
NotificationTypes List Yes No The types of the notification configurations for ESS events and resource changes. None

Tags syntax

"Tags": [
  {
    "Key": String,
    "Value": String
  }
]

Tags properties

Property Type Required Editable Description Constraint
Key String Yes No The tag key. The tag key must be 1 to 128 characters in length and cannot contain http:// or https://. It cannot start with acs: or aliyun.
Value String No No The tag value. The tag value must be 0 to 128 characters in length and cannot contain http:// or https://. It cannot start with acs: or aliyun.

Response parameters

Fn::GetAtt

  • ScalingGroupId: the ID of the scaling group.
  • ScalingGroupName: the name of the scaling group.

Examples

JSON format 

{
  "ROSTemplateFormatVersion": "2015-09-01",
  "Parameters": {
    "InstanceId": {
      "Type": "String",
      "Description": "The ID of the ECS instance from which the scaling group obtains configuration information of the specified instance."
    },
    "VSwitchIds": {
      "Type": "CommaDelimitedList",
      "Description": "Parameter VSwitchIds.N is used to create instance in multiple zones. Parameter VSwitchIds.N has a priority over parameter VSwitchId.\nThe valid range of N is [1, 5], and you can specify at most 5 VSwitches in a VPC.\nThe priority of VSwitches descends from 1 to 5, and 1 indicates the highest priority.\nWhen you fail to create an instance in the zone to which a specified VSwitch belongs, another VSwitch with less priority replaces the specified one automatically.",
      "MinLength": 0,
      "MaxLength": 5
    },
    "NotificationConfigurations": {
      "Type": "Json",
      "Description": "When a scaling event occurs in a scaling group, ESS will send a notification to Cloud Monitor or MNS."
    },
    "VSwitchId": {
      "Type": "String",
      "Description": "If you create a VPC scaling group, you must specify the ID of a VSwitch."
    },
    "LoadBalancerIds": {
      "Type": "CommaDelimitedList",
      "Description": "ID list of a Server Load Balancer instance. A Json Array with format: [ \"lb-id0\", \"lb-id1\", ... \"lb-idz\" ], support up to 100 Load Balancer instance.",
      "MaxLength": 100
    },
    "DesiredCapacity": {
      "Type": "Number",
      "Description": "The expected number of ECS instances in a scaling group. The scaling group automatically keeps the number of ECS instances as expected. The number of ECS instances cannot be greater than the value of MaxSize and cannot be less than the value of MinSize."
    },
    "GroupDeletionProtection": {
      "Type": "Boolean",
      "Description": "Whether to enable deletion protection for scaling group.\nDefault to False.",
      "AllowedValues": [
        "True",
        "true",
        "False",
        "false"
      ],
      "Default": false
    },
    "LaunchTemplateId": {
      "Type": "String",
      "Description": "The ID of the instance launch template from which the scaling group obtains launch configurations."
    },
    "MaxSize": {
      "Type": "Number",
      "Description": "Maximum number of ECS instances in the scaling group. Value range: [0, 1000].",
      "MinValue": 0,
      "MaxValue": 1000
    },
    "ScalingGroupName": {
      "Type": "String",
      "Description": "Name shown for the scaling group, which must contain 2-40 characters (English or Chinese). The name must begin with a number, an upper/lower-case letter or a Chinese character and may contain numbers, \"_\", \"-\" or \".\". The account name is unique in the same region.\nIf this parameter is not specified, the default value is ScalingGroupId.",
      "AllowedPattern": "^[a-zA-Z0-9\\u4e00-\\u9fa5][-_.a-zA-Z0-9\\u4e00-\\u9fa5]{1,63}$"
    },
    "MinSize": {
      "Type": "Number",
      "Description": "Minimum number of ECS instances in the scaling group. Value range: [0, 1000].",
      "MinValue": 0,
      "MaxValue": 1000
    },
    "DefaultCooldown": {
      "Type": "Number",
      "Description": "Default cool-down time (in seconds) of the scaling group. Value range: [0, 86400].\nThe default value is 300s.",
      "MinValue": 0,
      "MaxValue": 86400
    },
    "StandbyInstances": {
      "Type": "CommaDelimitedList",
      "Description": "ECS instances of standby mode in the scaling group.",
      "MaxLength": 1000
    },
    "LaunchTemplateVersion": {
      "Type": "String",
      "Description": "The version of the instance launch template. Valid values:\nA fixed template version numbe.\nDefault: The default template version is always used.\nLatest: The latest template version is always used."
    },
    "MultiAZPolicy": {
      "Type": "String",
      "Description": "ECS scaling strategy for multi availability zone. Allow value:\n1. PRIORITY: scaling the capacity according to the virtual switch (VSwitchIds.N) you define. ECS instances are automatically created using the next priority virtual switch when the higher priority virtual switch cannot be created in the available zone.\n2. BALANCE: evenly allocate ECS instances between the multiple available zone specified by the scaling group.",
      "AllowedValues": [
        "PRIORITY",
        "BALANCE"
      ]
    },
    "RemovalPolicys": {
      "Type": "CommaDelimitedList",
      "AllowedValues": [
        "OldestScalingConfiguration",
        "OldestInstance",
        "NewestInstance"
      ],
      "Description": "Policy for removing ECS instances from the scaling group.\nOptional values:\nOldestInstance: removes the first ECS instance attached to the scaling group.\nNewestInstance: removes the first ECS instance attached to the scaling group.\nOldestScalingConfiguration: removes the ECS instance with the oldest scaling configuration.\nDefault values: OldestScalingConfiguration and OldestInstance. You can enter up to two removal policies.",
      "MaxLength": 2
    },
    "ProtectedInstances": {
      "Type": "CommaDelimitedList",
      "Description": "ECS instances of protected mode in the scaling group.",
      "MaxLength": 1000
    },
    "DBInstanceIds": {
      "Type": "CommaDelimitedList",
      "Description": "ID list of an RDS instance. A Json Array with format: [ \"rm-id0\", \"rm-id1\", ... \"rm-idz\" ], support up to 100 RDS instance.",
      "MaxLength": 100
    },
    "Tags": {
      "Type": "Json",
      "Description": "Tags to attach to instance. Max support 20 tags to add during create instance. Each tag with two properties Key and Value, and Key is required.",
      "MaxLength": 20
    },
    "HealthCheckType": {
      "Type": "String",
      "Description": "The health check type. Allow values is \"ECS\" and \"NONE\", default to \"ECS\".",
      "AllowedValues": [
        "ECS",
        "NONE"
      ]
    }
  },
  "Resources": {
    "ScalingGroup": {
      "Type": "ALIYUN::ESS::ScalingGroup",
      "Properties": {
        "InstanceId": {
          "Ref": "InstanceId"
        },
        "VSwitchIds": {
          "Ref": "VSwitchIds"
        },
        "NotificationConfigurations": {
          "Ref": "NotificationConfigurations"
        },
        "VSwitchId": {
          "Ref": "VSwitchId"
        },
        "LoadBalancerIds": {
          "Ref": "LoadBalancerIds"
        },
        "DesiredCapacity": {
          "Ref": "DesiredCapacity"
        },
        "GroupDeletionProtection": {
          "Ref": "GroupDeletionProtection"
        },
        "LaunchTemplateId": {
          "Ref": "LaunchTemplateId"
        },
        "MaxSize": {
          "Ref": "MaxSize"
        },
        "ScalingGroupName": {
          "Ref": "ScalingGroupName"
        },
        "MinSize": {
          "Ref": "MinSize"
        },
        "DefaultCooldown": {
          "Ref": "DefaultCooldown"
        },
        "StandbyInstances": {
          "Ref": "StandbyInstances"
        },
        "LaunchTemplateVersion": {
          "Ref": "LaunchTemplateVersion"
        },
        "MultiAZPolicy": {
          "Ref": "MultiAZPolicy"
        },
        "RemovalPolicys": {
          "Ref": "RemovalPolicys"
        },
        "ProtectedInstances": {
          "Ref": "ProtectedInstances"
        },
        "DBInstanceIds": {
          "Ref": "DBInstanceIds"
        },
        "Tags": {
          "Ref": "Tags"
        },
        "HealthCheckType": {
          "Ref": "HealthCheckType"
        }
      }
    }
  },
  "Outputs": {
    "ScalingGroupId": {
      "Description": "Scaling group Id",
      "Value": {
        "Fn::GetAtt": [
          "ScalingGroup",
          "ScalingGroupId"
        ]
      }
    },
    "ScalingGroupName": {
      "Description": "Scaling group name",
      "Value": {
        "Fn::GetAtt": [
          "ScalingGroup",
          "ScalingGroupName"
        ]
      }
    }
  }
}

YAML format 

ROSTemplateFormatVersion: '2015-09-01'
Parameters:
  DBInstanceIds:
    Description: 'ID list of an RDS instance. A Json Array with format: [ "rm-id0",
      "rm-id1", ... "rm-idz" ], support up to 100 RDS instance.'
    MaxLength: 100
    Type: CommaDelimitedList
  DefaultCooldown:
    Description: 'Default cool-down time (in seconds) of the scaling group. Value
      range: [0, 86400].

      The default value is 300s.'
    MaxValue: 86400
    MinValue: 0
    Type: Number
  DesiredCapacity:
    Description: The expected number of ECS instances in a scaling group. The scaling
      group automatically keeps the number of ECS instances as expected. The number
      of ECS instances cannot be greater than the value of MaxSize and cannot be less
      than the value of MinSize.
    Type: Number
  GroupDeletionProtection:
    AllowedValues:
    - 'True'
    - 'true'
    - 'False'
    - 'false'
    Default: false
    Description: 'Whether to enable deletion protection for scaling group.

      Default to False.'
    Type: Boolean
  HealthCheckType:
    AllowedValues:
    - ECS
    - NONE
    Description: The health check type. Allow values is "ECS" and "NONE", default
      to "ECS".
    Type: String
  InstanceId:
    Description: The ID of the ECS instance from which the scaling group obtains configuration
      information of the specified instance.
    Type: String
  LaunchTemplateId:
    Description: The ID of the instance launch template from which the scaling group
      obtains launch configurations.
    Type: String
  LaunchTemplateVersion:
    Description: 'The version of the instance launch template. Valid values:

      A fixed template version numbe.

      Default: The default template version is always used.

      Latest: The latest template version is always used.'
    Type: String
  LoadBalancerIds:
    Description: 'ID list of a Server Load Balancer instance. A Json Array with format:
      [ "lb-id0", "lb-id1", ... "lb-idz" ], support up to 100 Load Balancer instance.'
    MaxLength: 100
    Type: CommaDelimitedList
  MaxSize:
    Description: 'Maximum number of ECS instances in the scaling group. Value range:
      [0, 1000].'
    MaxValue: 1000
    MinValue: 0
    Type: Number
  MinSize:
    Description: 'Minimum number of ECS instances in the scaling group. Value range:
      [0, 1000].'
    MaxValue: 1000
    MinValue: 0
    Type: Number
  MultiAZPolicy:
    AllowedValues:
    - PRIORITY
    - BALANCE
    Description: 'ECS scaling strategy for multi availability zone. Allow value:

      1. PRIORITY: scaling the capacity according to the virtual switch (VSwitchIds.N)
      you define. ECS instances are automatically created using the next priority
      virtual switch when the higher priority virtual switch cannot be created in
      the available zone.

      2. BALANCE: evenly allocate ECS instances between the multiple available zone
      specified by the scaling group.'
    Type: String
  NotificationConfigurations:
    Description: When a scaling event occurs in a scaling group, ESS will send a notification
      to Cloud Monitor or MNS.
    Type: Json
  ProtectedInstances:
    Description: ECS instances of protected mode in the scaling group.
    MaxLength: 1000
    Type: CommaDelimitedList
  RemovalPolicys:
    AllowedValues:
    - OldestScalingConfiguration
    - OldestInstance
    - NewestInstance
    Description: 'Policy for removing ECS instances from the scaling group.

      Optional values:

      OldestInstance: removes the first ECS instance attached to the scaling group.

      NewestInstance: removes the first ECS instance attached to the scaling group.

      OldestScalingConfiguration: removes the ECS instance with the oldest scaling
      configuration.

      Default values: OldestScalingConfiguration and OldestInstance. You can enter
      up to two removal policies.'
    MaxLength: 2
    Type: CommaDelimitedList
  ScalingGroupName:
    AllowedPattern: ^[a-zA-Z0-9\u4e00-\u9fa5][-_.a-zA-Z0-9\u4e00-\u9fa5]{1,63}$
    Description: 'Name shown for the scaling group, which must contain 2-40 characters
      (English or Chinese). The name must begin with a number, an upper/lower-case
      letter or a Chinese character and may contain numbers, "_", "-" or ".". The
      account name is unique in the same region.

      If this parameter is not specified, the default value is ScalingGroupId.'
    Type: String
  StandbyInstances:
    Description: ECS instances of standby mode in the scaling group.
    MaxLength: 1000
    Type: CommaDelimitedList
  Tags:
    Description: Tags to attach to instance. Max support 20 tags to add during create
      instance. Each tag with two properties Key and Value, and Key is required.
    MaxLength: 20
    Type: Json
  VSwitchId:
    Description: If you create a VPC scaling group, you must specify the ID of a VSwitch.
    Type: String
  VSwitchIds:
    Description: 'Parameter VSwitchIds.N is used to create instance in multiple zones.
      Parameter VSwitchIds.N has a priority over parameter VSwitchId.

      The valid range of N is [1, 5], and you can specify at most 5 VSwitches in a
      VPC.

      The priority of VSwitches descends from 1 to 5, and 1 indicates the highest
      priority.

      When you fail to create an instance in the zone to which a specified VSwitch
      belongs, another VSwitch with less priority replaces the specified one automatically.'
    MaxLength: 5
    MinLength: 0
    Type: CommaDelimitedList
Resources:
  ScalingGroup:
    Properties:
      DBInstanceIds:
        Ref: DBInstanceIds
      DefaultCooldown:
        Ref: DefaultCooldown
      DesiredCapacity:
        Ref: DesiredCapacity
      GroupDeletionProtection:
        Ref: GroupDeletionProtection
      HealthCheckType:
        Ref: HealthCheckType
      InstanceId:
        Ref: InstanceId
      LaunchTemplateId:
        Ref: LaunchTemplateId
      LaunchTemplateVersion:
        Ref: LaunchTemplateVersion
      LoadBalancerIds:
        Ref: LoadBalancerIds
      MaxSize:
        Ref: MaxSize
      MinSize:
        Ref: MinSize
      MultiAZPolicy:
        Ref: MultiAZPolicy
      NotificationConfigurations:
        Ref: NotificationConfigurations
      ProtectedInstances:
        Ref: ProtectedInstances
      RemovalPolicys:
        Ref: RemovalPolicys
      ScalingGroupName:
        Ref: ScalingGroupName
      StandbyInstances:
        Ref: StandbyInstances
      Tags:
        Ref: Tags
      VSwitchId:
        Ref: VSwitchId
      VSwitchIds:
        Ref: VSwitchIds
    Type: ALIYUN::ESS::ScalingGroup
Outputs:
  ScalingGroupId:
    Description: Scaling group Id
    Value:
      Fn::GetAtt:
      - ScalingGroup
      - ScalingGroupId
  ScalingGroupName:
    Description: Scaling group name
    Value:
      Fn::GetAtt:
      - ScalingGroup
      - ScalingGroupName

For more examples, visit ScalingGroup.json and ScalingGroup.yml. In the examples, the ALIYUN::ESS::ScalingGroup, ALIYUN::ESS::ScalingRule, ALIYUN::ESS::AlarmTask, ALIYUN::ESS::AlarmTaskEnable, ALIYUN::ESS::LifecycleHook, and ALIYUN::ESS::ScheduledTask resource types are involved.