On 02/15/2016 03:42 PM, Mike Wright wrote:
Hi everybody,
I have several large disks filled with experiments and multiboots. I
need to make changes to the current /boot/grub/grub.cfg but I have no
idea which one I'm using or which one of the systems' grub config tools
were used so I don't dare just grab any old one and use it
I've searched through seven VolumeGroups full of LogicalVolumes and
can't seem to find the one I'm using. Also combed through partitions
that are not part of LVM.
Does the boot process leave any footprints behind telling where it
booted from?
Rapidly losing what little is left of my mind...
You can always "cat /proc/cmdline" to see what the boot command line
was. In my case:
[root@prophead ~]# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-4.3.4-200.fc22.x86_64 root=/dev/mapper/fedora-root
ro rd.lvm.lv=fedora/swap vconsole.font=latarcyrheb-sun16
rd.lvm.lv=fedora/root rhgb quiet LANG=en_US.UTF-8
So it booted the 4.3.4-200.fc22.x86_64 kernel (yes, this machine is
still F22) and the current /dev/mapper/fedora-root is the root of my
filesystem. Digging a bit more:
[root@prophead ~]# ls -l /dev/mapper/fedora-root
lrwxrwxrwx. 1 root root 7 Feb 1 15:09 /dev/mapper/fedora-root -> ../dm-1
[root@prophead ~]# ls -l /dev/dm-1
brw-rw----. 1 root disk 253, 1 Feb 1 15:09 /dev/dm-1
So, /dev/mapper/fedora-root is is /dev/dm-1 or device major 253, minor
1. Dig a bit deeper:
[root@prophead ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 931.5G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 931G 0 part
├─fedora-swap 253:0 0 15.6G 0 lvm [SWAP]
├─fedora-root 253:1 0 606.8G 0 lvm /
├─fedora-home 253:2 0 293G 0 lvm /home
└─fedora-tmp 253:3 0 15.6G 0 lvm /tmp
sdb 8:16 0 465.8G 0 disk
└─sdb1 8:17 0 465.8G 0 part /media/500GB-Drive
sr0 11:0 1 2K 0 rom
So you can see my boot partition is a plain-old partition on /dev/sda1
and the root filesystem (block device 253:1) is a Linux LVM living on
/dev/sda2.
Does that help any?
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- Rick Stevens, Systems Engineer, AllDigital ricks@xxxxxxxxxxxxxx -
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- grasshopotomus: A creature that can leap to tremendous heights... -
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