I am quite new to Linux administration so I am having trouble understanding yum update and grub boot list.
I recently did a yum update on an old CentOS machine. Everything is good except there is multiple boot options appear in grub boot list and I wonder why? I managed to do a Google search and figured I can manually configure the boot order in /etc/grub.conf.
- Does it mean I now have multiple OS installed?
- Will my grub list grow if I do future yum update?
- Do I need to clean up old item from the list?