Adding swap space on Linux

A safety buffer when memory runs short.

Swap lets the system use disk space when memory is full, so programs slow down instead of being killed.

fallocate -l 2G /swapfile
chmod 600 /swapfile
mkswap /swapfile
swapon /swapfile
echo '/swapfile none swap sw 0 0' >> /etc/fstab
free -h

Swap is a buffer, not extra memory. If the server uses swap all the time, it needs more RAM; see Requesting an add-on.

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