aws ec2 two network cards

aws ec2 t2.micro instance
ubuntu server 14.04
create two subnets on a VPC
add two network cards to the VM
add an ip for each subnet
launch

eth1 wont be enable on boot.
adding /etc/network/interfaces.d/eth1.cfg
OR
adding /etc/network/interfaces
"auto eth1
iface eth1 inet dhcp"
reboot

*machine is unreachable*
---
ApportVersion: 2.14.1-0ubuntu3.4
Architecture: amd64
DistroRelease: Ubuntu 14.04
Ec2AMI: ami-2c90315b
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: eu-west-1a
Ec2InstanceType: t2.micro
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
Package: network
PackageArchitecture: amd64
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 3.13.0-36.63-generic 3.13.11.6
Tags: trusty ec2-images
Uname: Linux 3.13.0-36-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

_MarkForUpload: True