引用自：http://blog.sina.com.cn/s/blog_9150610c0102weym.html
引用自: https://blog.csdn.net/libaoan1971/article/details/52931284
dd if=/dev/zero of=/swapfile bs=1G count=16
chmod 600 /swapfile
mkswap /swapfile
swapon /swapfile
vim /etc/fstable
/swapfile swap swap defaults 0 0