https://ubuntu.com/tutorials/configure-ssh-2fa

# get current swap size
du --apparent-size --block-size=1 /var/swap.img -h

# create 8GB swap
swapoff /var/swap.img
dd if=/dev/zero of=/var/swap.img bs=1024k count=8000
mkswap /var/swap.img
swapon /var/swap.img

https://github.com/netdata/netdata/issues/1076#issuecomment-509214247

Tail log:

journalctl -xefu service-name