AWS EC2 user data error handling

userdata.sh

# error handling
# redirect logs so can be found in instance -> actions -> instance settings -> Get System log
exec > >(tee /var/log/user-data.log|logger -t user-data -s 2>/dev/console) 2>&1
# trap errors. Shutdown restarts machine in an hour and prevents further commands,
# so instances won't finish booting and won't report to ECS
function my_trap()
{
echo "Sorry, there was an error at line $1 $2" && shutdown -h +60
}
trap 'my_trap $${LINENO} $$? ' ERR
# /error handling