{
AssignPrivateIpAddressesRequest request = new AssignPrivateIpAddressesRequest();
request.setNetworkInterfaceId(networkInterface.getNetworkInterfaceId());
request.setSecondaryPrivateIpAddressCount(1);
ec2.assignPrivateIpAddresses(request);
}
ec2Instance = describeInstance(ec2, ec2InstanceId);
networkInterface = findNetworkInterface(ec2Instance, networkInterfaceIndex);
privateIp = findUnusedIp(networkInterface);