Spot Instance

module "spot_worker" {
  source  = "registry.patterneddesigns.ca/patterneddesigns/ec2-instance/aws"
  version = "1.5.0"

  instance_name = "batch-worker"
  instance_type = "c6i.xlarge"
  ami_id        = data.aws_ami.amazon_linux.id
  subnet_id     = module.vpc.private_subnets[0]

  spot_price                     = "0.10"
  spot_type                      = "persistent"
  spot_instance_interruption_behavior = "stop"

  user_data = <<-EOF
    #!/bin/bash
    # Configure instance to handle spot interruption
    yum install -y aws-cli jq

    # Start monitoring for spot interruption
    cat > /usr/local/bin/spot-monitor.sh << 'SCRIPT'
    #!/bin/bash
    while true; do
      if curl -s -o /dev/null -w "%{http_code}" http://169.254.169.254/latest/meta-data/spot/termination-time | grep -q 200; then
        echo "Spot instance termination notice received"
        # Graceful shutdown logic here
        systemctl stop myapp
        exit 0
      fi
      sleep 5
    done
    SCRIPT
    chmod +x /usr/local/bin/spot-monitor.sh
    /usr/local/bin/spot-monitor.sh &
  EOF

  tags = {
    Environment = "development"
    Workload    = "batch-processing"
  }
}