/touch /etc/modules-load.d/zram.conf
echo zram

/etc/modprobe.d/zram.conf
options zram num_devices=1

/etc/udev/rules.d/99-zram.rules
KERNEL=="zram0", ATTR{disksize}="4G" RUN="/usr/bin/mkswap /dev/zram0", TAG+="systemd"


/etc/fstab
/dev/zram0 none swap defaults 0 0