dd if=/dev/zero of=/swapfile bs=1M count=768
mkswap /swapfile
swapon /swapfile
vi /etc/fstab
/swapfile swap swap defaults 0 0
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dd if=/dev/zero of=/swapfile bs=1M count=768
mkswap /swapfile
swapon /swapfile
vi /etc/fstab
/swapfile swap swap defaults 0 0