swapon -a
swapoff -a
swapon --show&&swapoff -v /swap.img&& rm -rf /swap.img，
delete /etc/fstab
add
dd if=/dev/zero of=/swapfile bs=1024 count=2097152;
chmod 600 /swapfile;mkswap /swapfile;swapon /swapfile;
echo "/swapfile none swap sw 0 0" | sudo tee -a /etc/fstab
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