create or resize linux swap

created: 20240211 updated: 20240211 authors: alick97

how to resize swap

create new swap file eg: 8GB

• create empty file

  sudo dd if=/dev/zero of=/swapfile.img bs=1024 count=8M
  sudo chmod 600 /swapfile.img
  

• change format to swap

  sudo mkswap /swapfile.img
  

• mount to filesystem

  sudo swapon /swapfile.img
  

• set for reboot

  # vim /etc/fstab
  # add line
  /swapfile.img                                 none            swap    sw              0       0
  

if exist old swap, stop it and delete it.

• check it

  cat /etc/fatab
  

• stop it, eg: it is /swapfile

  sudo swapoff /swapfile
  

• remove if from tab for reboot

  # vim /etc/fstab
  # find line /swapfile and remove line
  

• remove file

  sudo rm /swapfile