Ubuntu swap 활성화

# swap 16GB
fallocate -l 16G /swap.img
dd if=/dev/zero of=/swap.img bs=1024 count=16777216
chmod 600 /swap.img
mkswap /swap.img
swapon /swap.img

vi /etc/fstab
/swap.img       none    swap    sw      0       0

swapon --show