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Enough RAM: Disabling SWAP in Ubuntu/Debian and CentOS/RedHat

Enough RAM: Disabling SWAP in Ubuntu/Debian and CentOS/RedHat

Disabling swap on Linux systems, including CentOS and Ubuntu, can be done using a few simple commands. Here are the steps for both operating systems:

For CentOS and Other RHEL-based Distributions:

Turn Off All Swap Spaces:

sudo swapoff -a

This command disables all active swap spaces immediately.

Permanently Disable Swap:

To prevent swap from being enabled on boot, you need to edit the /etc/fstab file.
Open /etc/fstab in a text editor with superuser privileges, for example:

sudo nano /etc/fstab

Comment out or delete the lines referring to swap partitions or files (usually labeled as swap in the file).
Save and close the file.

Reboot (Optional):

Reboot your system to ensure that the changes are correctly applied and that no swap is active:

sudo reboot

For Ubuntu and Other Debian-based Distributions:

Turn Off All Swap Spaces:

sudo swapoff -a

This command disables all active swap spaces immediately.

Permanently Disable Swap:

To permanently disable swap, edit the /etc/fstab file.

Open /etc/fstab in a text editor with superuser privileges, for example:

sudo nano /etc/fstab

Comment out or delete the lines referring to swap partitions or files. Save and close the file.

Reboot (Optional):

Consider rebooting your system to ensure that no swap is active:

sudo reboot

Important Considerations:

⚠️ Disabling swap can affect system performance, especially on systems with limited RAM.
⚠️ Ensure you have enough physical memory available to handle the system’s needs without swap.
⚠️ Disabling swap is generally not recommended on systems with limited physical memory.
⚠️ Always backup configuration files before editing.


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