2

I've entered the following

swapoff -a

This only works until reboot. I'm not sure the best way to permanently disable swaps on Centos. Can anyone advise? thanks

3

This configuration is stored in /etc/fstab by default in CentOS. You can check and remove your current swap device from that configuration file.

0

I cribbed this from https://www.refmanual.com/2016/01/08/completely-remove-swap-on-ce7/ with a bit of additional clarification and testing.

First disable swap temporarily:

# swapoff -a

Then remove the LVM volume for the swap:

# lvremove -Ay /dev/centos/swap

You can recover the space used by extending the root volume:

# lvextend -l +100%FREE centos/root

You then need to remove the LVM swap partition from the kernel boot command line by editing the GRUB configuration file in /etc/default/grub to remove the rd.lvm.lv=centos/swap device:

# vi /etc/default/grub
GRUB_TIMEOUT=5
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
##GRUB_CMDLINE_LINUX="rd.lvm.lv=centos/root rd.lvm.lv=centos/swap crashkernel=auto rhgb quiet"
GRUB_CMDLINE_LINUX="rd.lvm.lv=centos/root crashkernel=auto rhgb quiet"
GRUB_DISABLE_RECOVERY="true"

The GRUB configuration needs to be regenerated. On a BIOS boot system:

# grub2-mkconfig -o /etc/grub2.cfg

On a UEFI system:

# grub2-mkconfig -o /etc/grub2-efi.cfg

Edit /etc/fstab to remove or comment out the swap device:

# vi /etc/fstab
/dev/mapper/centos-root  /        xfs    defaults 0 0
#/dev/mapper/centos-swap swap     swap   defaults 0 0

Reboot and your system should come up without any swap.

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