sudo fallocate -l 1G /swapfile

sudo chmod 600 /swapfile

sudo mkswap /swapfile

sudo swapon /swapfile

sudo nano /etc/fstab

/swapfile   none    swap    sw    0   0

free -h

#设置为10为低，或60为高
sudo sysctl vm.swappiness=10
#永久保存
echo 'vm.swappiness=10' | sudo tee -a /etc/sysctl.conf