#创建一个大小为8G的文件/swap
sudo /bin/dd if=/dev/zero of=/var/swap bs=1M count=8192
sudo /sbin/mkswap /var/swap
sudo chmod 600 /var/swap
#enable /swap file  for paging and swapping
sudo /sbin/swapon /var/swap
#Enable swap on boot, 开机后自动生效
echo "/swap swap swap sw 0 0" >> /etc/fstab