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Questions tagged [grub]

Console application permitting the user to choose between several installed operating systems.

361 questions
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How can I tell which of two very similar linux kernels I booted from?

I have recently compiled a new kernel for my linux server. It is almost identical with the previous kernel (I added cifs support). Because physical access to the server is limited, I configured grub to fallback to the old kernel if the new kernel…
Dominic Cronin
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Unattended grub-pc update

I would like to know how to update grub-pc on a ubuntu 10.04 derivative distro without the configure grub-pc ncurses based dialog. I have tried examining debconf-get-selections before and after as well as variations on: apt-get -o…
fecko2130
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How Do You Non-Destructively Check if grub2 is Installed in The Boot Sector or is Being Chain-Loaded by grub1, Without Rebooting?

We're upgrading several systems from Debian Lenny to Squeeze and I'd like to ensure that I haven't missed any grub2 installations. By default, Squeeze chain-boot-loads from grub1 and you have to run upgrade-from-grub-legacy to upgrade. So I'd like…
chrishiestand
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No volume groups found - CentOS

I have migrated a CentOS 5.11 server from VmWare to Hyper-V and when trying to boot the server. I'm getting the following error messages: "No volume groups found" ""VolumeGroup00" not found" and consequently the other messages you see on the…
user2629636
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Grub rescue, will not boot from mdadm RAID, no such disk or device -- mduuid wrong?

I am running a 14 disk RAID 6 on mdadm behind 2 LSI SAS2008's in JBOD mode (no HW raid) on Debian 7 in BIOS legacy mode. Grub2 is dropping to a rescue shell complaining that "no such device" exists for…
ctrlbrk
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Cannot install grub, segmentation fault, unable to identify filesystem, superfluous RAID member, found two disks with same index — Debian 7

A server was recently transported from location A to B, a long journey that took six months. Things have gone wrong due to nothing being labeled prior to shipment. Yes, I know --- it was done by others, but I am paying the price. I must salvage…
ctrlbrk
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How to configure GRUB loader after apt-get upgrade on Ubuntu 12.04

I have a box with Ubuntu 12.04, and just did a apt-get upgrade. I'm presented with a dialogue to update my GRUB bootloader, but with the following message: The GRUB boot loader was previously installed to a disk that is no longer present, or whose…
knutole
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How to update-grub on a system running overlayroot?

We ship boxes configured with overlayroot, using the following overlayroot.conf: overlayroot=device:dev=/dev/sda6,timeout=20,recurse=0 Which produces the following mount configuration: $ mount overlayroot on / type overlayfs…
mikepurvis
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Modifying grub.conf file in linux

I edited the 'grub.conf' file of my linux system and changed the 'timeout' value in it and added some other line so as to solve the timeout issue of 'xm console guest' command. I was fool to assume that this 'timeout' parameter in grub.conf is…
stillStudent
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Use GRUB/GRUB2 to PXE boot OS image

Asked this in stackoverflow but they recommended I post this here: Here is the situation I am in: I currently have a Windows drive that boots XP. The BIOS does not support PXE booting so this is out of the question. Therefore, I was thinking I could…
Jack
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How do I chain boot from grub to syslinux?

I am expanding my rescue usb flash disk. The USB's partition is bootable, and I have installed GRUB to the MBR of the jump drive. It works pretty well - I can boot Freedos and run some utilities,and I can boot PING. I would like to add the Ubuntu…
pcapademic
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Converting Linux machine from XenServer to Hyper-V

I'm in the process of converting the last few on my XenServer VMs over to Hyper-V. The majority of them have been Windows machines and I've done a backup and restore using Windows Backup. For some of the windows boxes I've used the XenServer export…
Drifter104
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Modifying kernel cmdline in Ubuntu

I have a number of systems on which I need to modify the kernel cmdline, adding a few options. At the moment I do it using the following procedure: Open /etc/default/grub Modify GRUB_CMDLINE_LINUX_DEFAULT, adding the options Run…
pehrs
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Linux RAID 1: How to make a secondary HD boot?

I have the following RAID 1 on a Centos 6.5 server: # cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sdb1[3] 974713720 blocks super 1.0 [2/1] [_U] bitmap: 7/8 pages [28KB], 65536KB chunk md1 : active raid1 sdb2[3] sda2[2] …
Fernando
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X86 Solaris boot failure

We had a power outage last weekend that seems to have done some very bad things to one of our x86 Solaris machines. It is refusing to boot, and dropping me to the "grub>" prompt when started. I can get it to recognize the multiboot kernel and…
John
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