4.2. Understanding boot entries

A boot entry is a collection of options stored in a configuration file and tied to a particular kernel version. In practice, you have at least as many boot entries as your system has installed kernels. The boot entry configuration file is located in the /boot/loader/entries/ directory:

d8712ab6d4f14683c5625e87b52b6b6e-6.12.0.el10_0.x86_64.conf

The file name consists of a machine ID stored in the /etc/machine-id file, and a kernel version.

The boot entry configuration file contains information about the kernel version, the initial ramdisk image, and the kernel command-line parameters. The example contents of a boot entry config can be seen below:

title Red Hat Enterprise Linux (6.12.0-0.el10_0.x86_64) 10.0
version 6.12.0-0.el10_0.x86_64
linux /vmlinuz-6.12.0-0.el10_0.x86_64
initrd /initramfs-6.12.0-0.el10_0.x86_64.img
options root=/dev/mapper/rhel_kvm--02--guest08-root ro crashkernel=2G-64G:256M,64G-:512M resume=/dev/mapper/rhel_kvm--02--guest08-swap rd.lvm.lv=rhel_kvm-02-guest08/root rd.lvm.lv=rhel_kvm-02-guest08/swap console=ttyS0,115200
grub_users $grub_users
grub_arg --unrestricted
grub_class kernel