def create_mount_target(FileSystemId=None, SubnetId=None, IpAddress=None,
    SecurityGroups=None):
    """
    Creates a mount target for a file system. You can then mount the file system on EC2 instances via the mount target.
    You can create one mount target in each Availability Zone in your VPC. All EC2 instances in a VPC within a given Availability Zone share a single mount target for a given file system. If you have multiple subnets in an Availability Zone, you create a mount target in one of the subnets. EC2 instances do not need to be in the same subnet as the mount target in order to access their file system. For more information, see Amazon EFS: How it Works .
    In the request, you also specify a file system ID for which you are creating the mount target and the file system's lifecycle state must be available . For more information, see  DescribeFileSystems .
    In the request, you also provide a subnet ID, which determines the following:
    After creating the mount target, Amazon EFS returns a response that includes, a MountTargetId and an IpAddress . You use this IP address when mounting the file system in an EC2 instance. You can also use the mount target's DNS name when mounting the file system. The EC2 instance on which you mount the file system via the mount target can resolve the mount target's DNS name to its IP address. For more information, see How it Works: Implementation Overview .
    Note that you can create mount targets for a file system in only one VPC, and there can be only one mount target per Availability Zone. That is, if the file system already has one or more mount targets created for it, the subnet specified in the request to add another mount target must meet the following requirements:
    If the request satisfies the requirements, Amazon EFS does the following:
    Each Amazon EFS mount target has one corresponding requester-managed EC2 network interface. After the network interface is created, Amazon EFS sets the NetworkInterfaceId field in the mount target's description to the network interface ID, and the IpAddress field to its address. If network interface creation fails, the entire CreateMountTarget operation fails.
    We recommend you create a mount target in each of the Availability Zones. There are cost considerations for using a file system in an Availability Zone through a mount target created in another Availability Zone. For more information, see Amazon EFS . In addition, by always using a mount target local to the instance's Availability Zone, you eliminate a partial failure scenario. If the Availability Zone in which your mount target is created goes down, then you won't be able to access your file system through that mount target.
    This operation requires permissions for the following action on the file system:
    This operation also requires permissions for the following Amazon EC2 actions:
    See also: AWS API Documentation
    
    Examples
    This operation creates a new mount target for an EFS file system.
    Expected Output:
    
    :example: response = client.create_mount_target(
        FileSystemId='string',
        SubnetId='string',
        IpAddress='string',
        SecurityGroups=[
            'string',
        ]
    )
    
    
    :type FileSystemId: string
    :param FileSystemId: [REQUIRED]
            ID of the file system for which to create the mount target.
            

    :type SubnetId: string
    :param SubnetId: [REQUIRED]
            ID of the subnet to add the mount target in.
            

    :type IpAddress: string
    :param IpAddress: Valid IPv4 address within the address range of the specified subnet.

    :type SecurityGroups: list
    :param SecurityGroups: Up to five VPC security group IDs, of the form sg-xxxxxxxx . These must be for the same VPC as subnet specified.
            (string) --
            

    :rtype: dict
    :return: {
        'OwnerId': 'string',
        'MountTargetId': 'string',
        'FileSystemId': 'string',
        'SubnetId': 'string',
        'LifeCycleState': 'creating'|'available'|'deleting'|'deleted',
        'IpAddress': 'string',
        'NetworkInterfaceId': 'string'
    }
    
    
    :returns: 
    Must belong to the same VPC as the subnets of the existing mount targets
    Must not be in the same Availability Zone as any of the subnets of the existing mount targets
    
    """
    pass
