Add swap file to CentOS 7, Amazon AWS

move to super user

sudo su

create 1GB swap file

dd if=/dev/zero of=/myswap bs=1M count=1024

only root should have access

chown root:root /myswap
chmod 0600 /myswap

At this point the content of / are:

format as swap

mkswap /myswap

last check without swap on:

free -m

announce to system

swapon /myswap

there should be swap on now:

free -m

vi /etc/fstab

UUID=cf990154-eb88-40fc-88f2-f208d0b88c2a /                       xfs     defaults        0 0
/myswap swap swap defaults 0 0

Here is full file:

This configuration causes such a trouble. Now to reboot the computer it is more required to manually stop thing:

systemctl stop httpd zabbix-agent zabbix-server mariadb && sleep 1 && swapoff -a && sleep 1 && reboot

or wait 30 minutes for reboot to succeed by default.