vpcZoneIdentifier

A list of subnet IDs for a virtual private cloud (VPC) where instances in the Auto Scaling group can be created. If this resource specifies public subnets and is also in a VPC that is defined in the same stack template, you must use the DependsOn attribute to declare a dependency on the VPC-gateway attachment. When you update `VPCZoneIdentifier`, this retains the same Auto Scaling group and replaces old instances with new ones, according to the specified subnets. You can optionally specify how CloudFormation handles these updates by using an UpdatePolicy attribute. Required to launch instances into a nondefault VPC. If you specify `VPCZoneIdentifier` with `AvailabilityZones`, the subnets that you specify for this property must reside in those Availability Zones.

A list of subnet IDs for a virtual private cloud (VPC) where instances in the Auto Scaling group can be created. If this resource specifies public subnets and is also in a VPC that is defined in the same stack template, you must use the DependsOn attribute to declare a dependency on the VPC-gateway attachment. When you update `VPCZoneIdentifier`, this retains the same Auto Scaling group and replaces old instances with new ones, according to the specified subnets. You can optionally specify how CloudFormation handles these updates by using an UpdatePolicy attribute. Required to launch instances into a nondefault VPC. If you specify `VPCZoneIdentifier` with `AvailabilityZones`, the subnets that you specify for this property must reside in those Availability Zones.