AWS/Enable ENA Support in Ubuntu
In order to enable this feature, you must launch an HVM AMI with the appropriate drivers. C5, R4, X1, I3, P3, P2, G3, and m4.16xlarge instances provide the Elastic Network Adapter (ENA) interface (which uses the “ena” Linux driver) for Enhanced Networking. C3, C4, R3, I2, M4 (except m4.16xlarge) and D2 instances use Intel® 82599g Virtual Function Interface (which uses the “ixgbevf” Linux driver). Amazon Linux AMI includes both of these drivers by default. For AMIs that do not contain these drivers, you will need to download and install the appropriate drivers based on the instance types you plan to use. You can use Linux or Windows instructions to enable Enhanced Networking in AMIs that do not include the SR-IOV driver by default. Enhanced Networking is only supported in Amazon VPC.
This is required for any instance running on new Amazon EC2 (own built hypervisor) built on core Linux Kernel-based Virtual Machine (KVM) technology, but does not include general purpose operating system components
Verify current settings
Verify Instance Attribute (enaSupport)
aws ec2 describe-instances --instance-ids i-0303ce0e47eac5f7d --query 'Reservations[].Instances[].EnaSupport' --profile devops-vpc
Verify Image Attribute (enaSupport)
aws ec2 describe-images --image-id ami-8fd760f6 --query 'Images[].EnaSupport' --profile devops-vpc #official eu-west-1 xenial 16.04 amd64 hvm-ssd 20171121.1 ami-8fd760f6
[
true
]
Check if your network adapter is using ena driver
[ec2-user ~]$ ethtool -i eth0 driver: ena version: 0.6.6
Enable ENA
Update ENA drives on Ubuntu 16.04 and modify an instance-attribute to SupportENA
Install driver
ubuntu:~$ sudo apt-get update && sudo apt-get upgrade -y ubuntu:~$ sudo apt-get install -y build-essential dkms ubuntu:~$ git clone https://github.com/amzn/amzn-drivers ubuntu:~$ sudo mv amzn-drivers /usr/src/amzn-drivers-1.0.0
Create DMKS config file
ubuntu:~$ sudo touch /usr/src/amzn-drivers-1.0.0/dkms.conf
ubuntu:~$ sudo vim /usr/src/amzn-drivers-1.0.0/dkms.conf
PACKAGE_NAME="ena"
PACKAGE_VERSION="1.0.0"
CLEAN="make -C kernel/linux/ena clean"
MAKE="make -C kernel/linux/ena/ BUILD_KERNEL=${kernelver}"
BUILT_MODULE_NAME[0]="ena"
BUILT_MODULE_LOCATION="kernel/linux/ena"
DEST_MODULE_LOCATION[0]="/updates"
DEST_MODULE_NAME[0]="ena"
AUTOINSTALL="yes"
Build, and install the ena module on your instance using dkms
ubuntu:~$ sudo dkms add -m amzn-drivers -v 1.0.0 # Add the module to dkms ubuntu:~$ sudo dkms build -m amzn-drivers -v 1.0.0 # Build the module using dkms ubuntu:~$ sudo dkms install -m amzn-drivers -v 1.0.0 # Install the module using dkms
Rebuild initramfs so the correct module is loaded at boot time.
ubuntu:~$ sudo update-initramfs -c -k all
Modify ec2 instance-attribute to SupportENA
aws ec2 stop-instances --instance-ids i-0b7f3342388888888 --dry-run --profile devops-vpc
aws ec2 modify-instance-attribute --instance-id i-0b7f3342388888888 --ena-support --profile devops-vpc
aws ec2 describe-instances --instance-ids i-0b7f3342388888888 --query 'Reservations[].Instances[].EnaSupport' --profile devops-vpc
[
true
]
aws ec2 start-instances --instance-ids i-0b7f3342388888888
To avoid stop starting instances you can reload kernel module (not recommended)
sudo rmmod ena && sudo modprobe ena
Now login to a box and check a network interface driver in use
[ec2-user ~]$ ethtool -i eth0 driver: ena version: 1.4.0g