Adding swap to a CentOS 7 AWS virtual machine

This is the steps for adding swap space to an CentOS 7 server.

dd if=/dev/zero of=/swapfile count=2048 bs=1MiB
chmod 600 /swapfile
chown root. /swapfile
mkswap /swapfile
swapon /swapfile
echo "/swapfile swap swap sw 0 0" >> /etc/fstab

Check to make sure it created correctly

swapon -s

That’s it

This note was written testing against the following image:

uname -a: Linux s17.iotau.io 3.10.0-862.11.6.el7.x86_64 #1 SMP Tue Aug 14 21:49:04 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux