Ensure that you are using an AMI that is enabled for ENA.

[Nida1998]

Description

data "aws_ebs_snapshot" "sftp-s1" {
  most_recent = true
  owners = ["self"]

  filter {
    name   = "tag:DeviceName"
    values = ["/dev/sdf"]
  }

  filter {
    name   = "tag:Name"
    values = ["server"]
  }
}

resource "aws_ami" "custom_ami" {
  name                = "custom-ami"
  virtualization_type = "hvm"
  root_device_name    = "/dev/sdf"

  ebs_block_device {
    device_name = "/dev/sdf"
    snapshot_id = data.aws_ebs_snapshot.sftp-s1.id
    volume_size = 5
  }

}

resource "aws_instance" "server-sftp" {
  ami           = aws_ami.sftp_ami.id
  instance_type = "t3.medium"
  subnet_id     = var.public_subnet_2a
  root_block_device {
    volume_size = 20
    volume_type = "gp2"  # You can specify the type of volume, e.g., gp2, gp3, io1, io2, etc.
  }
}

I am trying to initiate instance, having ami creating in same terraform script by picking up specific snapshot. but getting below error:

terraform error: Error launching source instance: InvalidParameterCombination: Enhanced networking with the Elastic Network Adapter (ENA) is required for the 't3.large' instance type. Ensure that you are using an AMI that is enabled for ENA.

anywork around is highly appreciated, I need to create multiple instances of size t3.medium.

References

No response

Would you like to implement a fix?

None

[github-actions[bot]]

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[stefanfreitag]

Hi @Nida1998!

I was going through your explanation, let me recap what I understood.

• You want to launch EC2s with t3.large instance type
• You have a custom AMI that you would like to use for these EC2s
• The error message highlights a discrepancy between AMI and instance type selection: the ENA support is causing trouble.

When registering an AMI with AWS you need to specify if it supports ENA or not. On a Terraform aws_ami resource there is the attribute ena_support that you could look into.