Differences

This shows you the differences between two versions of the page.

--- linux:linux_boot_order [2024/09/21 21:57]
manu created
+++ linux:linux_boot_order [2024/09/22 21:43] (current)
manu [Grub]
@@ Line 5: / Line 5: @@
 Initial RAM disk (initrd or Initramfs) is a RAM filesystem mounted at startup to initialize kernel modules.
+===== Initrd =====
+Rebuild initrd
+<cli prompt='#'>
+# dracut -f
+</cli>
+Another example to add multipathing
+<cli prompt='#'>
+# dracut --force --add multipath
+</cli>
+**Regenerating the initramfs**
+  * Adding Drivers Because of Hardware Changes
+  * Moving System Directories to a RAID or LVM
+  * Adding Disks to an LVM Group or Btrfs RAID Containing the Root File System
+  * Changing Kernel Variables (sysctl)
+  * Adding or removing swap devices, re-creating swap area, it required also to recreate grub
 You can read the content of initrd
@@ Line 17: / Line 35: @@
 # cp /boot/initrd.img .
 # unmkinitramfs initrd.img .
+</cli>
+===== Grub =====
+Generate a new grub.cfg on BIOS based server
+<cli prompt='#'>
+# grub2-mkconfig -o /boot/grub2/grub.cfg
+</cli>
+Generate a new grub.cfg on UEFI based server
+<cli prompt='#'>
+# grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg
+</cli>
+Check the syntax of grub.cfg
+<cli prompt='#'>
+# grub2-script-check /boot/grub2/grub.cfg
 </cli>

wiki