increase mymory by swap file

ubuntu-make-swap-file.sh

# ref. https://askubuntu.com/a/1075516/22308

sudo swapoff /swapfile # make all swap off
sudo rm -rf /swapfile # remove the current

#                                8Gb=8*1024Mb=8192 Mb
#                                4Gb=4*1024Mb=4096 Mb
sudo dd if=/dev/zero of=/swapfile bs=1M count=4096 # resize the swapfile to 4Gb
#                                            =

sudo chmod 600 /swapfile

sudo mkswap /swapfile # format the file as swap

sudo swapon /swapfile # activate it
sudo swapon -s        # view swap size

# ensure swapfile persist wh reboot - add to /etc/fstab ifnotalreadypresent  ref https://x.com/i/grok/share/ctPttiuOtlGwhOndGj6lrKXLq
if ! grep -q '/swapfile' /etc/fstab; then
    echo     '/swapfile    none    swap    sw    0    0' | sudo tee -a /etc/fstab
fi

Thank you!