Linux: Adding swap after partition

Create a file size (size*1024), we are using 512MB:
dd if=/dev/zero of=/swapfile1 bs=1024 count=524288

Create swap:
mkswap /swapfile

Turn on swap:
swapon /swapfile

Edit swap file:
vi /etc/fstab
/swapfile swap swap defaults 0 0

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