aws/amazon-ssm-agent#353 https://repost.aws/knowledge-center/ec2-memory-swap-file
sudo dd if=/dev/zero of=/swapfile bs=128M count=4 # 512 MB, e.g. t4g.nano
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile
sudo swapon -s
echo "/swapfile swap swap defaults 0 0" >> /etc/fstab
mount -a