To begin with, before creating a swap file, it is advisable to check the list of mounted partitions and their size. To do this, execute the df -h command.
In this example, a swap file will be created in the /var directory with a size of 4GB.
Creating a swap file
Create an empty file and set the correct permissions:
[wpcm lang="bash"]sudo touch /var/.swap.img sudo chmod 600 /var/.swap.img[/wpcm]
Fill the file with zeros to the desired size (4GB in this example):
[wpcm lang="bash"]sudo dd if=/dev/zero of=/var/.swap.img bs=1024k count=4096[/wpcm]
Format the swap file as swap space:
[wpcm lang="bash"]sudo mkswap /var/.swap.img[/wpcm]
Activate the swap file:
[wpcm lang="bash"]sudo swapon /var/.swap.img[/wpcm]
To make the swap file persistent across reboots, add it to the /etc/fstab file:
[wpcm lang="bash"]sudo echo "/var/.swap.img none swap sw 0 0" >> /etc/fstab[/wpcm]
Verify that the swap file is active and working correctly:
[wpcm lang="bash"]free -h[/wpcm]
or
[wpcm lang="bash"]swapon --show[/wpcm]
The swap file will now provide additional virtual memory to your system, which can be beneficial for managing memory-intensive tasks.
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