Disable SWAP

Disabling swap on K3S nodes is recommended for several reasons. Firstly, Kubernetes applications are designed to manage their own memory usage, and enabling swap can lead to unexpected performance issues and instability as the system may swap container data to disk. Secondly, disabling swap ensures that Kubernetes workloads have predictable and consistent memory behavior, helping to avoid potential problems related to excessive swap usage. Lastly, some container runtime environments, like Docker, do not handle swap well, and disabling it helps maintain compatibility and stability when running K3S clusters.

Disabling SWAP using /etc/fstab

Open /etc/fstab with editor like vim vi or nano
Locate line hat corresponds to your swap partition

To remove swap you can comment line (recommended), or remove the line completely from fstab

After making changes type below commands

It is recommended to reboot the server after make these changes

Disable using swapiness

This is another way to disable swap.

On server open /etc/sysctl.conf using editor and add 0 to swappiness

save changes and exit

Apply the changes by running below command