linux swap

Adding extra Swap to Linux


On one of my servers I needed extra swap space because the datacenter screwed up the partitioning and I didn’t have time to reimage the machine. so an easy way to add swap after partitioning is just to add it via a new file on any partition.

lets say you want to add 8GB of swap in a file called swapfile based in /

# generate empty swap file
sudo dd if=/dev/zero of=/swapfile bs=1024 count=8192k
# make the file into swap ready file
sudo mkswap /swapfile
# enable swap on said file so the OS / kernel knows about it
sudo swapon /swapfile
#list enabled swap
swapon -s

This will last till a reboot, so you need to add it to /etc/fstab.  type :

sudo nano /etc/fstab

add at the bottom :

/swapfile       none           swap    sw      0       0

and you are done 🙂

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