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Linux: Create a swap

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There are two ways to create a swap in Linux.

Use disk partition

Make a partition first

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fdisk /dev/sda1
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mkswap /dev/sda1
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swapon /dev/sda1
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blkid
UUID="40a10328-63e5-4450-8bed-1739bc472d2d"
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vi /etc/fstab
UUID="40a10328-63e5-4450-8bed-1739bc472d2d"   swap swap defaults 0 0
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mount -a

Use a file

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dd if=/dev/zero of=/tmp/swap bs=1M count=128
mkswap /tmp/swap
swapon /tmp/swap
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vi /etc/fstab
/tmp/swap swap swap defaults  0 0