1. log in to the system as root
$ sudo sh
password:
#
2.configure additional swap space
cd /
sudo dd if=/dev/zero of =/swapfile bs=1M count=1536
sudo mkswap /swapfile
sudo swapon /swapfile
sudo vi /etc/fstab //加到fstab文件中让系统引导时自动启动 "/swapfile swap swap defaults 0 0"
finally, I failed