ec2

AWS Move Instance to Another Zone

December 23, 2021

Here’s how to move an AWS instance to another zone.

Stop the instance first.

aws ec2 stop-instances --instance-ids i-1234567890abcdef0

Create an AMI image.

aws ec2 create-image \
--instance-id i-1234567890abcdef0 \
--name "my-ami" \
--description "my-ami"

Create EC2 instance using Terraform. The contents of main.tf.

terraform {
  required_providers {
    aws = {
      source = "hashicorp/aws"
    }
  }
}
provider "aws" {
  profile = "default"
  region  = "us-east-1"
}
resource "aws_instance" "ulysses" {
  ami                           = "ami-1234567890abcdef0"
  key_name                      = "servers"
  iam_instance_profile          = "machine-role"
  instance_type                 = "t3.micro"
  subnet_id                     = "subnet-1234567890abcdef0"
  security_groups               = ["sg-1234567890abcdef0", "sg-1234567890abcdef1"]
  tags = {
    Name = "moving-instance"
    tag1 = "test1"
    tag2 = "test2"
  }
}

Launch it.

terraform init
terraform plan
terraform apply

Terraform User Data

October 26, 2021

Here’s how to add userdata in Terraform.

user_data = filebase64("${path.module}/example.sh")

AWS EC2 ENA Support

May 7, 2021

AWS has machine types that require ENA Support. You can run AWS CLI to find out if instance is ENA enabled.

aws ec2 describe-instances \
--instance-id i-xxxxxxxxxxxxxxxxx \
--profile default \
--region us-east-1 \
--query 'Reservations[].Instances[].EnaSupport'

sudo lspci | grep -i Amazon

List driver details.

modinfo nvme

Verify modules loaded at startup.

lsmod | grep nvme
lsmod | grep ena

If ENA drivers are missing, install them.

yum install pciutils