Changing swap memory under Linux:

dd if=/dev/zero of=/swap2 bs=1024K count=2048 

sudo dd if=/dev/zero of=/swap2 bs=1024K count=2048 

mkswap /swap2 

chmod 0600 /swap2 

swapon /swap2 

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Reference:

1. Swap Arch Wiki
2. The Use of Swap Space in Modern Linux Systems
3. Swap Memory: What It Is, How It Works, and How to Manage It