Swap

• What's the right amount of swap space for a modern Linux system?

Calculate swap space needed, i.e. 1.5x24 GB RAM = 36 GB

LANGUAGE=en ram_mb=$(free -m | grep '^Mem:' | sed 's/[^0-9]*//' | cut -d' ' -f1)

Using a swapfile

swapoff -a
lvremove /dev/ubuntu-vg/swap_1
# bs in GB (bytes * 1024³)
dd conv=notrunc if=/dev/zero of=/var/lib/swapfile bs=1048576 count=$ram_mb
mkswap /var/lib/swapfile
chmod 600 /var/lib/swapfile

Then edit /etc/fstab and add the swapfile, afterwards:

swapon -a
swapon -s