RHEL failed to start after removing swap partition!

1 What happened?

When preparing a server for k8s, the swap was disabled, and to reuse the swap partition, it's removed.

# swapoff -a

# lvremove /dev/rhel/swap

# vi /etc/fstab ( delete swap entry)

# reboot

Then, the server failed to start and entered a dracut state.

2 Root cause

After swap partition was removed, the GRUB menu entries are still having it.

# cat /etc/grub2.cfg | grep swap

rd.lvm.lv=rhel/swap

3 Solution

Step 0:  edit GRUB2 menu and boot system

Power on the server, and press "Down Arrow" key to enter GRUB UI.

Then press "e" to edit the menu temporarily by deleting "rd.lvm.lv=rhel/swap".

Press "Ctr + X" to boot into OS

Step 1: update /etc/default/grub by deletinig swap parameter

# vi /etc/default/grub

(delete "rd.lvm.lv=rhel/swap")

Step 2: Regenerate grub2.cfg

# grub2-mkconfig > /etc/grub2.cfg

Finally, reboot the system to verify.