Script to quickly launch EC2 instances in a preset VPC, type, etc

launch-ubuntu-instance.sh

#!/bin/bash

# ======= Configuration =======
REGION="us-east-1"                     # Set your AWS region
INSTANCE_TYPE="t2.micro"
KEY_NAME="your-key-pair-name"
SECURITY_GROUP_ID="sg-xxxxxxxxxxxxxxx"
SUBNET_ID="subnet-xxxxxxxxxxxxxxxxx"
UBUNTU_OWNER="099720109477"            # Canonical (Ubuntu's AWS account ID)
UBUNTU_NAME_FILTER="ubuntu/images/hvm-ssd/ubuntu-jammy-22.04-amd64-server-*"
# ==============================

# Input: instance suffix name
if [ -z "$1" ]; then
  echo "Usage: $0 <instance-name-suffix>"
  exit 1
fi

INSTANCE_NAME="temp-instance-$1"

# Get latest Ubuntu AMI ID
echo "Fetching latest Ubuntu AMI ID for $REGION..."
AMI_ID=$(aws ec2 describe-images \
  --region "$REGION" \
  --owners "$UBUNTU_OWNER" \
  --filters "Name=name,Values=$UBUNTU_NAME_FILTER" "Name=state,Values=available" \
  --query 'Images | sort_by(@, &CreationDate)[-1].ImageId' \
  --output text)

if [ -z "$AMI_ID" ]; then
  echo "Failed to find Ubuntu AMI."
  exit 1
fi

# Launch the EC2 instance
echo "Launching EC2 instance named '$INSTANCE_NAME' with 50GB root volume..."
INSTANCE_ID=$(aws ec2 run-instances \
  --region "$REGION" \
  --image-id "$AMI_ID" \
  --count 1 \
  --instance-type "$INSTANCE_TYPE" \
  --key-name "$KEY_NAME" \
  --security-group-ids "$SECURITY_GROUP_ID" \
  --subnet-id "$SUBNET_ID" \
  --block-device-mappings "[{\"DeviceName\":\"/dev/sda1\",\"Ebs\":{\"VolumeSize\":50,\"VolumeType\":\"gp3\",\"DeleteOnTermination\":true}}]" \
  --tag-specifications "ResourceType=instance,Tags=[{Key=Name,Value=$INSTANCE_NAME}]" \
  --query 'Instances[0].InstanceId' \
  --output text)

if [ -z "$INSTANCE_ID" ]; then
  echo "Failed to launch instance."
  exit 1
fi

# Wait for the instance to be in 'running' state
echo "Waiting for instance to be in 'running' state..."
aws ec2 wait instance-running \
  --region "$REGION" \
  --instance-ids "$INSTANCE_ID"

# Get and print the private IP address
PRIVATE_IP=$(aws ec2 describe-instances \
  --region "$REGION" \
  --instance-ids "$INSTANCE_ID" \
  --query 'Reservations[0].Instances[0].PrivateIpAddress' \
  --output text)

if [ -z "$PRIVATE_IP" ]; then
  echo "Failed to retrieve private IP address."
  exit 1
fi

echo "Private IP: $PRIVATE_IP"