Delete ASG instances and launch configurations only for ASG using deprecated LCs

asg-cleanup.sh

# Loop through all Auto Scaling Groups (ASGs) with Launch Configurations
for asg in $(aws autoscaling describe-auto-scaling-groups --region us-east-1 \
    --query 'AutoScalingGroups[?LaunchConfigurationName!=null].AutoScalingGroupName' \
    --output text); do

    echo "Deleting Auto Scaling group: $asg"

    # Set desired capacity to 0 to terminate instances
    aws autoscaling update-auto-scaling-group --auto-scaling-group-name "$asg" \
        --region us-east-1 --desired-capacity 0

    # Disable instance protection (optional, in case some ASGs have instance protection enabled)
    aws autoscaling update-auto-scaling-group --auto-scaling-group-name "$asg" \
    --region us-east-1 --new-instances-protected-from-scale-in

    # Wait for instances to terminate (optional: you can include this to ensure that instances are fully terminated)
    aws autoscaling describe-auto-scaling-groups --auto-scaling-group-names "$asg" \
        --region us-east-1 --query 'AutoScalingGroups[0].Instances'

    # Delete the Auto Scaling group
    aws autoscaling delete-auto-scaling-group --auto-scaling-group-name "$asg" \
        --region us-east-1 --force-delete

    echo "$asg deleted."
done

# Now delete the associated Launch Configurations
for lc in $(aws autoscaling describe-launch-configurations --region us-east-1 \
    --query 'LaunchConfigurations[].LaunchConfigurationName' --output text); do

    echo "Deleting Launch Configuration: $lc"

    # Delete the Launch Configuration
    aws autoscaling delete-launch-configuration --launch-configuration-name "$lc" \
        --region us-east-1

    echo "$lc deleted."
done

check-asg-instance-count.sh

for asg in $(aws autoscaling describe-auto-scaling-groups --region us-east-1 \
    --query 'AutoScalingGroups[?LaunchConfigurationName!=null].AutoScalingGroupName' \
    --output text); do

    # Get the number of instances in the Auto Scaling group
    instance_count=$(aws autoscaling describe-auto-scaling-groups --region us-east-1 \
        --auto-scaling-group-names "$asg" \
        --query 'AutoScalingGroups[0].Instances | length(@)' \
        --output text)

    echo "Auto Scaling group: $asg has $instance_count instances."

done