Step1: Verify if the ENA driver is installed on the EC2 Instance by running the modinfo command as below:
modinfo ena
If ENA driver is not installed, you need to first install it.
Step2: Check if ENA is enabled on the EC2 Instance by running the below command:
aws ec2 describe-instances --instance-ids INSTANCEID --query "Reservations[].Instances[].EnaSupport"
If ENA is already enabled, the output from above command says “True”. If there is no output from the above command, ENA is not enabled. Stop the Instance and enable ENA using the below commands:
aws ec2 stop-instances --instance-ids INSTANCEID
aws ec2 modify-instance-attribute --instance-id INSTANCEID --ena-support
Step3: Change the EC2 Instance type and start the Instance as shown here from AWS Management console or from CLI using the below commands:
aws ec2 modify-instance-attribute --instance-id INSTANCEID --instance-type "{\"Value\": \"r5.xlarge\"}"
aws ec2 start-instances --instance-ids INSTANCEID