def create_instances(options = {})
      batch = []
      options = options.merge(subnet_id: @id)
      resp = @client.run_instances(options)
      resp.data.instances.each do |i|
        batch << Instance.new(
          id: i.instance_id,
          data: i,
          client: @client
        )
      end
      Instance::Collection.new([batch], size: batch.size)
    end
def create_instances(options = {})
      batch = []
      options = options.merge(subnet_id: @id)
      resp = @client.run_instances(options)
      resp.data.instances.each do |i|
        batch << Instance.new(
          id: i.instance_id,
          data: i,
          client: @client
        )
      end
      Instance::Collection.new([batch], size: batch.size)
    end
@!group Actions
 @example Request syntax with placeholder values

   instance = subnet.create_instances({
     block_device_mappings: [
       {
         device_name: "String",
         virtual_name: "String",
         ebs: {
           delete_on_termination: false,
           iops: 1,
           snapshot_id: "String",
           volume_size: 1,
           volume_type: "standard", # accepts standard, io1, gp2, sc1, st1
           encrypted: false,
           kms_key_id: "String",
         },
         no_device: "String",
       },
     ],
     image_id: "String",
     instance_type: "t1.micro", # accepts t1.micro, t2.nano, t2.micro, t2.small, t2.medium, t2.large, t2.xlarge, t2.2xlarge, t3.nano, t3.micro, t3.small, t3.medium, t3.large, t3.xlarge, t3.2xlarge, t3a.nano, t3a.micro, t3a.small, t3a.medium, t3a.large, t3a.xlarge, t3a.2xlarge, m1.small, m1.medium, m1.large, m1.xlarge, m3.medium, m3.large, m3.xlarge, m3.2xlarge, m4.large, m4.xlarge, m4.2xlarge, m4.4xlarge, m4.10xlarge, m4.16xlarge, m2.xlarge, m2.2xlarge, m2.4xlarge, cr1.8xlarge, r3.large, r3.xlarge, r3.2xlarge, r3.4xlarge, r3.8xlarge, r4.large, r4.xlarge, r4.2xlarge, r4.4xlarge, r4.8xlarge, r4.16xlarge, r5.large, r5.xlarge, r5.2xlarge, r5.4xlarge, r5.12xlarge, r5.24xlarge, r5.metal, r5a.large, r5a.xlarge, r5a.2xlarge, r5a.4xlarge, r5a.12xlarge, r5a.24xlarge, r5d.large, r5d.xlarge, r5d.2xlarge, r5d.4xlarge, r5d.12xlarge, r5d.24xlarge, r5d.metal, r5ad.large, r5ad.xlarge, r5ad.2xlarge, r5ad.4xlarge, r5ad.8xlarge, r5ad.12xlarge, r5ad.16xlarge, r5ad.24xlarge, x1.16xlarge, x1.32xlarge, x1e.xlarge, x1e.2xlarge, x1e.4xlarge, x1e.8xlarge, x1e.16xlarge, x1e.32xlarge, i2.xlarge, i2.2xlarge, i2.4xlarge, i2.8xlarge, i3.large, i3.xlarge, i3.2xlarge, i3.4xlarge, i3.8xlarge, i3.16xlarge, i3.metal, hi1.4xlarge, hs1.8xlarge, c1.medium, c1.xlarge, c3.large, c3.xlarge, c3.2xlarge, c3.4xlarge, c3.8xlarge, c4.large, c4.xlarge, c4.2xlarge, c4.4xlarge, c4.8xlarge, c5.large, c5.xlarge, c5.2xlarge, c5.4xlarge, c5.9xlarge, c5.18xlarge, c5d.large, c5d.xlarge, c5d.2xlarge, c5d.4xlarge, c5d.9xlarge, c5d.18xlarge, c5n.large, c5n.xlarge, c5n.2xlarge, c5n.4xlarge, c5n.9xlarge, c5n.18xlarge, cc1.4xlarge, cc2.8xlarge, g2.2xlarge, g2.8xlarge, g3.4xlarge, g3.8xlarge, g3.16xlarge, g3s.xlarge, cg1.4xlarge, p2.xlarge, p2.8xlarge, p2.16xlarge, p3.2xlarge, p3.8xlarge, p3.16xlarge, p3dn.24xlarge, d2.xlarge, d2.2xlarge, d2.4xlarge, d2.8xlarge, f1.2xlarge, f1.4xlarge, f1.16xlarge, m5.large, m5.xlarge, m5.2xlarge, m5.4xlarge, m5.12xlarge, m5.24xlarge, m5.metal, m5a.large, m5a.xlarge, m5a.2xlarge, m5a.4xlarge, m5a.12xlarge, m5a.24xlarge, m5d.large, m5d.xlarge, m5d.2xlarge, m5d.4xlarge, m5d.12xlarge, m5d.24xlarge, m5d.metal, m5ad.large, m5ad.xlarge, m5ad.2xlarge, m5ad.4xlarge, m5ad.8xlarge, m5ad.12xlarge, m5ad.16xlarge, m5ad.24xlarge, h1.2xlarge, h1.4xlarge, h1.8xlarge, h1.16xlarge, z1d.large, z1d.xlarge, z1d.2xlarge, z1d.3xlarge, z1d.6xlarge, z1d.12xlarge, z1d.metal, u-6tb1.metal, u-9tb1.metal, u-12tb1.metal, a1.medium, a1.large, a1.xlarge, a1.2xlarge, a1.4xlarge
     ipv_6_address_count: 1,
     ipv_6_addresses: [
       {
         ipv_6_address: "String",
       },
     ],
     kernel_id: "String",
     key_name: "String",
     max_count: 1, # required
     min_count: 1, # required
     monitoring: {
       enabled: false, # required
     },
     placement: {
       availability_zone: "String",
       affinity: "String",
       group_name: "String",
       partition_number: 1,
       host_id: "String",
       tenancy: "default", # accepts default, dedicated, host
       spread_domain: "String",
     },
     ramdisk_id: "String",
     security_group_ids: ["String"],
     security_groups: ["String"],
     user_data: "String",
     additional_info: "String",
     client_token: "String",
     disable_api_termination: false,
     dry_run: false,
     ebs_optimized: false,
     iam_instance_profile: {
       arn: "String",
       name: "String",
     },
     instance_initiated_shutdown_behavior: "stop", # accepts stop, terminate
     network_interfaces: [
       {
         associate_public_ip_address: false,
         delete_on_termination: false,
         description: "String",
         device_index: 1,
         groups: ["String"],
         ipv_6_address_count: 1,
         ipv_6_addresses: [
           {
             ipv_6_address: "String",
           },
         ],
         network_interface_id: "String",
         private_ip_address: "String",
         private_ip_addresses: [
           {
             primary: false,
             private_ip_address: "String",
           },
         ],
         secondary_private_ip_address_count: 1,
         subnet_id: "String",
         interface_type: "String",
       },
     ],
     private_ip_address: "String",
     elastic_gpu_specification: [
       {
         type: "String", # required
       },
     ],
     elastic_inference_accelerators: [
       {
         type: "String", # required
       },
     ],
     tag_specifications: [
       {
         resource_type: "client-vpn-endpoint", # accepts client-vpn-endpoint, customer-gateway, dedicated-host, dhcp-options, elastic-ip, fleet, fpga-image, host-reservation, image, instance, internet-gateway, launch-template, natgateway, network-acl, network-interface, reserved-instances, route-table, security-group, snapshot, spot-instances-request, subnet, transit-gateway, transit-gateway-attachment, transit-gateway-route-table, volume, vpc, vpc-peering-connection, vpn-connection, vpn-gateway
         tags: [
           {
             key: "String",
             value: "String",
           },
         ],
       },
     ],
     launch_template: {
       launch_template_id: "String",
       launch_template_name: "String",
       version: "String",
     },
     instance_market_options: {
       market_type: "spot", # accepts spot
       spot_options: {
         max_price: "String",
         spot_instance_type: "one-time", # accepts one-time, persistent
         block_duration_minutes: 1,
         valid_until: Time.now,
         instance_interruption_behavior: "hibernate", # accepts hibernate, stop, terminate
       },
     },
     credit_specification: {
       cpu_credits: "String", # required
     },
     cpu_options: {
       core_count: 1,
       threads_per_core: 1,
     },
     capacity_reservation_specification: {
       capacity_reservation_preference: "open", # accepts open, none
       capacity_reservation_target: {
         capacity_reservation_id: "String",
       },
     },
     hibernation_options: {
       configured: false,
     },
     license_specifications: [
       {
         license_configuration_arn: "String",
       },
     ],
   })
 @param [Hash] options ({})
 @option options [Array<Types::BlockDeviceMapping>] :block_device_mappings
   The block device mapping entries. You can't specify both a snapshot
   ID and an encryption value. This is because only blank volumes can be
   encrypted on creation. If a snapshot is the basis for a volume, it is
   not blank and its encryption status is used for the volume encryption
   status.
 @option options [String] :image_id
   The ID of the AMI. An AMI is required to launch an instance and must
   be specified here or in a launch template.
 @option options [String] :instance_type
   The instance type. For more information, see [Instance Types][1] in
   the *Amazon Elastic Compute Cloud User Guide*.

   Default: `m1.small`



   [1]: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-types.html
 @option options [Integer] :ipv_6_address_count
   \[EC2-VPC\] The number of IPv6 addresses to associate with the primary
   network interface. Amazon EC2 chooses the IPv6 addresses from the
   range of your subnet. You cannot specify this option and the option to
   assign specific IPv6 addresses in the same request. You can specify
   this option if you've specified a minimum number of instances to
   launch.

   You cannot specify this option and the network interfaces option in
   the same request.
 @option options [Array<Types::InstanceIpv6Address>] :ipv_6_addresses
   \[EC2-VPC\] The IPv6 addresses from the range of the subnet to
   associate with the primary network interface. You cannot specify this
   option and the option to assign a number of IPv6 addresses in the same
   request. You cannot specify this option if you've specified a minimum
   number of instances to launch.

   You cannot specify this option and the network interfaces option in
   the same request.
 @option options [String] :kernel_id
   The ID of the kernel.

   We recommend that you use PV-GRUB instead of kernels and RAM disks.
   For more information, see [ PV-GRUB][1] in the *Amazon Elastic Compute
   Cloud User Guide*.



   [1]: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/UserProvidedkernels.html
 @option options [String] :key_name
   The name of the key pair. You can create a key pair using
   CreateKeyPair or ImportKeyPair.

   If you do not specify a key pair, you can't connect to the instance
   unless you choose an AMI that is configured to allow users another way
   to log in.
 @option options [required, Integer] :max_count
   The maximum number of instances to launch. If you specify more
   instances than Amazon EC2 can launch in the target Availability Zone,
   Amazon EC2 launches the largest possible number of instances above
   `MinCount`.

   Constraints: Between 1 and the maximum number you're allowed for the
   specified instance type. For more information about the default
   limits, and how to request an increase, see [How many instances can I
   run in Amazon EC2][1] in the Amazon EC2 FAQ.



   [1]: http://aws.amazon.com/ec2/faqs/#How_many_instances_can_I_run_in_Amazon_EC2
 @option options [required, Integer] :min_count
   The minimum number of instances to launch. If you specify a minimum
   that is more instances than Amazon EC2 can launch in the target
   Availability Zone, Amazon EC2 launches no instances.

   Constraints: Between 1 and the maximum number you're allowed for the
   specified instance type. For more information about the default
   limits, and how to request an increase, see [How many instances can I
   run in Amazon EC2][1] in the Amazon EC2 General FAQ.



   [1]: http://aws.amazon.com/ec2/faqs/#How_many_instances_can_I_run_in_Amazon_EC2
 @option options [Types::RunInstancesMonitoringEnabled] :monitoring
   Specifies whether detailed monitoring is enabled for the instance.
 @option options [Types::Placement] :placement
   The placement for the instance.
 @option options [String] :ramdisk_id
   The ID of the RAM disk to select. Some kernels require additional
   drivers at launch. Check the kernel requirements for information about
   whether you need to specify a RAM disk. To find kernel requirements,
   go to the AWS Resource Center and search for the kernel ID.

   We recommend that you use PV-GRUB instead of kernels and RAM disks.
   For more information, see [ PV-GRUB][1] in the *Amazon Elastic Compute
   Cloud User Guide*.



   [1]: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/UserProvidedkernels.html
 @option options [Array<String>] :security_group_ids
   The IDs of the security groups. You can create a security group using
   CreateSecurityGroup.

   Default: Amazon EC2 uses the default security group.

   You cannot specify this option and the network interfaces option in
   the same request.
 @option options [Array<String>] :security_groups
   \[EC2-Classic, default VPC\] The names of the security groups. For a
   nondefault VPC, you must use security group IDs instead.

   You cannot specify this option and the network interfaces option in
   the same request.

   Default: Amazon EC2 uses the default security group.
 @option options [String] :user_data
   The user data to make available to the instance. For more information,
   see [Running Commands on Your Linux Instance at Launch][1] (Linux) and
   [Adding User Data][2] (Windows). If you are using a command line tool,
   base64-encoding is performed for you, and you can load the text from a
   file. Otherwise, you must provide base64-encoded text. User data is
   limited to 16 KB.



   [1]: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/user-data.html
   [2]: https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/ec2-instance-metadata.html#instancedata-add-user-data
 @option options [String] :additional_info
   Reserved.
 @option options [String] :client_token
   Unique, case-sensitive identifier you provide to ensure the
   idempotency of the request. For more information, see [Ensuring
   Idempotency][1].

   Constraints: Maximum 64 ASCII characters



   [1]: https://docs.aws.amazon.com/AWSEC2/latest/APIReference/Run_Instance_Idempotency.html
 @option options [Boolean] :disable_api_termination
   If you set this parameter to `true`, you can't terminate the instance
   using the Amazon EC2 console, CLI, or API; otherwise, you can. To
   change this attribute to `false` after launch, use
   ModifyInstanceAttribute. Alternatively, if you set
   `InstanceInitiatedShutdownBehavior` to `terminate`, you can terminate
   the instance by running the shutdown command from the instance.

   Default: `false`
 @option options [Boolean] :dry_run
   Checks whether you have the required permissions for the action,
   without actually making the request, and provides an error response.
   If you have the required permissions, the error response is
   `DryRunOperation`. Otherwise, it is `UnauthorizedOperation`.
 @option options [Boolean] :ebs_optimized
   Indicates whether the instance is optimized for Amazon EBS I/O. This
   optimization provides dedicated throughput to Amazon EBS and an
   optimized configuration stack to provide optimal Amazon EBS I/O
   performance. This optimization isn't available with all instance
   types. Additional usage charges apply when using an EBS-optimized
   instance.

   Default: `false`
 @option options [Types::IamInstanceProfileSpecification] :iam_instance_profile
   The IAM instance profile.
 @option options [String] :instance_initiated_shutdown_behavior
   Indicates whether an instance stops or terminates when you initiate
   shutdown from the instance (using the operating system command for
   system shutdown).

   Default: `stop`
 @option options [Array<Types::InstanceNetworkInterfaceSpecification>] :network_interfaces
   The network interfaces to associate with the instance.
 @option options [String] :private_ip_address
   \[EC2-VPC\] The primary IPv4 address. You must specify a value from
   the IPv4 address range of the subnet.

   Only one private IP address can be designated as primary. You can't
   specify this option if you've specified the option to designate a
   private IP address as the primary IP address in a network interface
   specification. You cannot specify this option if you're launching
   more than one instance in the request.

   You cannot specify this option and the network interfaces option in
   the same request.
 @option options [Array<Types::ElasticGpuSpecification>] :elastic_gpu_specification
   An elastic GPU to associate with the instance. An Elastic GPU is a GPU
   resource that you can attach to your Windows instance to accelerate
   the graphics performance of your applications. For more information,
   see [ Amazon EC2 Elastic GPUs][1] in the *Amazon Elastic Compute Cloud
   User Guide*.



   [1]: https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/elastic-graphics.html
 @option options [Array<Types::ElasticInferenceAccelerator>] :elastic_inference_accelerators
   An elastic inference accelerator to associate with the instance.
   Elastic inference accelerators are a resource you can attach to your
   Amazon EC2 instances to accelerate your Deep Learning (DL) inference
   workloads.
 @option options [Array<Types::TagSpecification>] :tag_specifications
   The tags to apply to the resources during launch. You can only tag
   instances and volumes on launch. The specified tags are applied to all
   instances or volumes that are created during launch. To tag a resource
   after it has been created, see CreateTags.
 @option options [Types::LaunchTemplateSpecification] :launch_template
   The launch template to use to launch the instances. Any parameters
   that you specify in RunInstances override the same parameters in the
   launch template. You can specify either the name or ID of a launch
   template, but not both.
 @option options [Types::InstanceMarketOptionsRequest] :instance_market_options
   The market (purchasing) option for the instances.

   For RunInstances, persistent Spot Instance requests are only supported
   when **InstanceInterruptionBehavior** is set to either `hibernate` or
   `stop`.
 @option options [Types::CreditSpecificationRequest] :credit_specification
   The credit option for CPU usage of the T2 or T3 instance. Valid values
   are `standard` and `unlimited`. To change this attribute after launch,
   use ModifyInstanceCreditSpecification. For more information, see
   [Burstable Performance Instances][1] in the *Amazon Elastic Compute
   Cloud User Guide*.

   Default: `standard` (T2 instances) or `unlimited` (T3 instances)



   [1]: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/burstable-performance-instances.html
 @option options [Types::CpuOptionsRequest] :cpu_options
   The CPU options for the instance. For more information, see
   [Optimizing CPU Options][1] in the *Amazon Elastic Compute Cloud User
   Guide*.



   [1]: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-optimize-cpu.html
 @option options [Types::CapacityReservationSpecification] :capacity_reservation_specification
   Information about the Capacity Reservation targeting option. If you do
   not specify this parameter, the instance's Capacity Reservation
   preference defaults to `open`, which enables it to run in any open
   Capacity Reservation that has matching attributes (instance type,
   platform, Availability Zone).
 @option options [Types::HibernationOptionsRequest] :hibernation_options
   Indicates whether an instance is enabled for hibernation. For more
   information, see [Hibernate Your Instance][1] in the *Amazon Elastic
   Compute Cloud User Guide*.



   [1]: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Hibernate.html
 @option options [Array<Types::LicenseConfigurationRequest>] :license_specifications
   The license configurations.
 @return [Instance::Collection]