Questions tagged [grub]

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

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GRUB "USB lock" for Linux Full Disk Encryption

Hy everyone. I'm investigating the possibility of using something like USB hardware locking dongles (like these ones used for software locking and licensing) to provide the key that Grub asks for ...
André Maricato's user avatar
1 vote
1 answer
89 views

Centos 5.4 wont boot

I have three disks in a centos server but it won boot,I have no grub at all.I tried to install grub with super grub and fix the system with rescatux but in vain.Is there a way to boot into centos?Here ...
Keftef's user avatar
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How can I get into debian to edit grub settings when grub is hidden and shift key does not bring up menu?

I wanted to hide GRUB during boot, so that I can access the list of OS whenever I want to boot something other than the default. I hid GRUB by specifying in /etc/default/grub that GRUB_TIMEOUT=0 ...
Mikkel Rev's user avatar
0 votes
1 answer
149 views

Centos 6.8 failed reboot dedicated server

Ok so I bought/rent a dedicated server from nocix with Centos 6.8 installed, also came with 2 hard drives sda - 128GB SSD & sdb - 2TB HDD and I think I made a mistake by partitioning the second ...
Shane Buckley's user avatar
1 vote
2 answers
6k views

PXE boot with grub: root variable unset

I configured a dhcp and tftp server, for my tests, I used at first time, syslinux to boot over PXE network successfully. Now I want to use grub instead of syslinux to boot, in order to do that, I ...
StormByte's user avatar
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3 votes
2 answers
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Kernel Panic on CentOS - Google Compute Engine Instance

I'm getting a kernel panic error in a CentOS instance of Google Compute Engine. I'm able to see the error and already figure out how to solve it, but I can't get into the GRUB menu trough the serial ...
João Felipe Coutinho de Sousa's user avatar
0 votes
1 answer
1k views

How to change boot drive on server with RAID 5 software raid

I have my hardware-owned dedicated server hosted in remote datacenter, running CentOS release 6.4 (Final) with grub (GNU GRUB 0.97). Server has 6 2TB drives with 2 software raids on them - md0 raid 1 ...
Josef's user avatar
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Debian 7 can not boot, grub rescue show error: out of partition

Debian 7 amd64 running in VirtualBox 5.0.10, on Windows 8.1 ent x64 host. This VM running more than 1 years. Use basic partition, NOT LVM or any Raid. Today it's suddenly auto umount all disk, and ...
consatan's user avatar
  • 121
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0 answers
259 views

Grub loading error 21

I have a 2-disk software RAID CentOS 6 system that I just installed. When I boot from the disk I get "Error 21" from GRUB. I have run this command on sda and sdb, after booting from the rescue DVD ...
Sol's user avatar
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How can I start grub using grub on my new installation

I have installed a Scientific Linux 6 (like Centos 6) on my first drive sda and use it as my working linux, in order to continue to user my working ditribution I have Installed a Scientific Linux 7 on ...
famedoro's user avatar
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2 votes
1 answer
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Solaris 10 x86 hangs on boot

I have an old server running Solaris 10 x86 64 bit. Haven't had issues with it but recently it was powered off without a clean shutdown. That hasn't been an issue in the past with reboots from the ...
OrganicLawnDIY's user avatar
0 votes
1 answer
542 views

Cannot Boot Centos Machine on GCP (Google Compute)

I have a Centos 6 server that's been running fine for 6mths on Google Compute Platform for the past 6mths. Without a restart - it froze this morning and on reboot is producing the following errors ...
PeterM's user avatar
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-1 votes
1 answer
909 views

sed + replace value default in grub.conf [closed]

I want to change the default value on all machines to default=0 default value could be any integer number how to set in the sed syntax that default could be any number my example ( not working ) ...
dandan's user avatar
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2 votes
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399 views

How to ignore ttyS0 in GRUB

I've got some systems that have serial devices attached; when these systems boot, the serial device may be sending data, so GRUB sees this, assumes it's a request to manage the boot process, and sits ...
wortmanb's user avatar
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2 answers
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Linux + how to clean /boot and stay only with the current kernel version files

Under /boot we have the following files ( red-hat Linux version 6.6 ) cd /boot # ls -ltr drwx------ 2 root root 12288 Oct 15 2015 lost+found -rwxr-xr-x 1 root root 4152624 Oct 15 2015 ...
dandan's user avatar
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3 votes
2 answers
17k views

how to configure the grub.cfg file on redhat 7 in order to boot from specific kernel

In Red Hat EL versions 5 and 6 we can easily to update the /etc/grub.conf in case we want to change the kernel by default variable For example , grub.conf on redhat 5 default=0 timeout=5 #...
dandan's user avatar
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2 votes
1 answer
2k views

Why does my server not boot after moving root fs, inside LVM, to raid?

I'm trying to move my root partition to raid based physical volumes, and I seem to be failing. The procedure I'm using is somewhat complicated, but that's because my hosting provider has very limited ...
Huash7ee's user avatar
3 votes
3 answers
8k views

Change kernel of Centos OVH

I'm using a server of OVH with OS centos7. OVH has its own linux kernel: 3.14.32-xxxx-grs-ipv6-64 Now I try to configure another Centos7 kernel. I installed the other kernel(s). yum install kernel ...
DenCowboy's user avatar
  • 323
4 votes
0 answers
372 views

How to modify the grub default timeout for CoreOS?

I am trying to reset the root password for my CoreOS machine for which I need access to the machine's grub. However, I don't see the grub at all and the machine boots up. I am on CoreOS stable (1010.5....
jobin's user avatar
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2 votes
1 answer
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GPT, grub and mdadm. sda drive replaced, raid rebuilt in recovery mode, but now server won't boot

This is how partition table loooks like: (parted) print Model: ATA TOSHIBA DT01ACA2 (scsi) Disk /dev/sda: 2000GB Sector size (logical/...
Mladen Adamovic's user avatar
0 votes
2 answers
63 views

issues booting fresh install of UbuntuOS

I have 2 hard drives on my server and i have previously installed CentOS on one of the hard drives(not sure which but i am guessing the second) I install fresh Ubuntu 14.04LTS on the first one i ...
uberrebu's user avatar
  • 513
1 vote
1 answer
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linux red hat + how to start as single user mode from grub

I have this in my linux machine grub> how from this I start the linux machine as single user mode? in order to update some file after boot
dandan's user avatar
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2 votes
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941 views

How to validate grub boot environment parameters with grubby

I am updating grub parameters in RHEL 7.0 with grubby command using /usr/sbin/grubby --update-kernel=ALL --args='isolcpus=14-24' followed by /usr/sbin/grub2-install /dev/sda and reboot I very well ...
Waqas's user avatar
  • 131
5 votes
3 answers
8k views

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 ...
Drifter104's user avatar
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4 votes
1 answer
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Is it possible and wise to put the grub bios partition on a software raid?

in a two disk setup /dev/sda /dev/sdb i created per disk 3 partitions bios_grub 1mb linux raid 512mb md0 (/boot - ext3) linux raid rest md1 (physical volume for lvm) the answer on https://...
c33s's user avatar
  • 1,535
1 vote
0 answers
498 views

Problems installing software on AWS EC2 instance (Debian 7.8 'hvm')

After some issues due to the lack of support in required kernel for the network card in my machine (though I'm aware of how to compile the driver for my card, I don't want to do that, based on some ...
Aleksandr Blekh's user avatar
2 votes
2 answers
2k views

Debian software RAID1 is not working when I remove hard drive

I have been trying all weekend to get RAID working on an old server computer with the Intel ICH7 / ICH7-R SATA-II controller running dual hard-drive with RAID 1. After giving up in hardware raid, I ...
Skyler 440's user avatar
2 votes
1 answer
708 views

Replaced SATA controller, software RAID (mdadm) stopped booting: grub rescue> no such disk

I have a relatively old server machine which has no SATA ports on the motherboard (Dell Precision Workstaion 650). Also have a cheap FakeRAID controller (VIA VT6421 Chipset) and two Seagate 3TB drives ...
sd1074's user avatar
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0 votes
1 answer
456 views

Copy centos 6 modify mdadm raid 1 and clone to new mdadm raid 1 ssd

I have: Centos 6.7 grub-install -v grub-install (GNU GRUB 0.97) lsblk two new SSD 128gb Live usb with Parted_Magic_2015.03.06 /boot/grub/device.map # this device map was generated by anaconda (...
snex's user avatar
  • 191
1 vote
0 answers
432 views

Cloudlinux, GRUB 0.97, software RAID, won't automatically boot

My server is running Cloudlinux as has a software RAID mirror (/dev/md2 made from /dev/sda and /dev/sdb) mounted on / It's been running fine, but after simulating a raid failure and rebuilding the ...
rmm's user avatar
  • 81
2 votes
2 answers
819 views

EXTLINUX warns to install grub

While doing apt-get dist-upgrade on a Debian GNU/Linux Jessie EXTLINUX warned me that now was mandatory to install grub. The system was installed after an image not done by me: is it safe to ignore ...
473183469's user avatar
  • 1,370
2 votes
1 answer
622 views

grub 0.97 (legacy) confusion between menu.lst and grub.cfg

I've been looking through documentation but am still utterly confused. I'm used to using menu.lst to configure grub but grub.cfg seems to be the way to do it for grub2. My Debian 8 server has grub 0....
Tim Tisdall's user avatar
6 votes
3 answers
8k views

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 ...
user2629636's user avatar
0 votes
1 answer
516 views

How to save output from grub-md5-crypt to a file ?

I am using Cent OS 6.5 and I want to save the generated output and md5 hash from grub-md5-crypt command to a file. The grub-md5-crypt command asks us to set a password. I want the password(which I ...
Muddassir Nazir's user avatar
2 votes
2 answers
2k views

Intel NUC5CPYH - Ubuntu Server 14.04.2 and 15.04 post-install crash

I've experienced this problem with Intel NUC model NUC5CPYH using both Ubuntu Server 14.04.2 and Ubuntu Server 15.04. After completing the installation (which in my experience is best done from an ...
gogoud's user avatar
  • 131
0 votes
1 answer
303 views

How can I modify the bootloader config on debian 7

I want to install Debian 7 remotely. I've followed this tutorial: https://wiki.debian.org/DebianInstaller/Remote How can I execute Step 8? I found the command update-grub but I don't know where to ...
Charles's user avatar
  • 185
0 votes
1 answer
251 views

Deleted MBR on virtual machine on purpose, but entries are preserved

I'm playing with Master boot record. I decided to delete and restore it on my vmware machine. With Ubuntu LiveCD I'm trying to erase partition entries and signature with command: dd if=/dev/zero of=/...
user3345632's user avatar
0 votes
1 answer
1k views

Debian/Installer Preseed Remove Post Install Kernel Options + Multi NIC Preseed Tip

In light of recent automation trends, I would like to be able to fully automate an install of Ubuntu. My my first problem was auto selection of the bootif with multiple NICs break Ubuntu/Debians ...
Scott Mattan's user avatar
9 votes
5 answers
9k views

Disable THP and THP defrag on CentOS 7 EC2 instance

I want to disable transparent_hugepage (THP) on a CentOS 7 EC2 instance, which is enabled by default: # cat /sys/kernel/mm/transparent_hugepage/enabled [always] madvise never # cat /sys/kernel/mm/...
vcarel's user avatar
  • 434
1 vote
1 answer
231 views

XEN - Does pygrub alter grub on dom0

I apologize for question but I did not really understand the idea behind pygrub. I've downloaded VM from stacklet.com. The image is shipped as a ext4 file and pygrub config. My question is if I can ...
Wakan Tanka's user avatar
1 vote
0 answers
1k views

Unable to install grub to software Raid array in Ubuntu

How do you ensure Grub is properly installed on a software RAID array in Ubuntu? I have a failed RAID array on an Ubuntu 14.04 server. When I first tried booting it, the Grub screen came up, but ...
Cerin's user avatar
  • 3,650
1 vote
1 answer
1k views

How do I replace a disk with LUKS on LVM2 - no raid, no span

I have LUKS on LVM (LVM Partitions created first, then each partition is encrypted separately, following this guide on Arch Wiki). I am using two volume groups, and each is isolated to a drive. This ...
Damon's user avatar
  • 131
2 votes
1 answer
3k views

Default kernel boot parameter on Red Hat 6 / CentOS 6

I would like to understand if, and how, it is possible to configure default kernel boot parameters on Red Hat 6 / CentOS 6 (grub legacy bootloader). I very well understand how to manually configure ...
shodanshok's user avatar
  • 50.5k
0 votes
1 answer
7k views

How to fix when grub no longer mounts the boot partition at start up?

This system has a boot partition on a dm-raid device. I updated the system by standard methods from an older Ubuntu to the latest LTS. Now, if the kernel is updated by "apt-get upgrade", the new ...
ndasusers's user avatar
  • 427
2 votes
1 answer
2k views

How to boot to shell with Solaris?

I would like to boot Solaris to shell (root prompt) directly for recovery purposes. On linux I would pass a kernel option init=/bin/bash and it would directly boot me into shell without asking for ...
cstamas's user avatar
  • 6,747
1 vote
1 answer
3k views

Install grub on mounted kvm image?

I am trying to mount a KVM image on the host machine in order to fix a grub issue however seem to be going wrong somewhere. I have tried the following steps: mount -o loop,offset=32256 /var/lib/...
Leoric80's user avatar
-2 votes
1 answer
1k views

framebuffer loads under Linux, but not Xen

I recently built a Debian "Wheezy" system, which booted via GRUB to a non-framebuffer console, printing Console: colour VGA+ 80x25 during boot. To /etc/default/grub I added GRUB_GFXMODE=1920x1200 ...
Mike's user avatar
  • 247
-2 votes
1 answer
2k views

Empty /boot/grub/grub.conf of a remote server, how to recrete it from recovery?

My remote server (running CentOS 6.6 x64) can't boot anymore. Using the emergency recovery (a LIVE CD) i can actually look that /etc/boot/grub/grub.conf and it's empty (0 bytes). I don't know why, ...
gremo's user avatar
  • 349
3 votes
1 answer
893 views

How to keep specific old kernels around after a yum update

I know that in CentOS 6.x, you can put the following line in /etc/yum.conf which tells yum to keep the last N kernels (by default this is set to five): installonly_limit=5 However, there are cases ...
tgharold's user avatar
  • 639
1 vote
3 answers
1k views

Grub CLI Arrow Keys Don't Work With IPMI SOL

When I am using the Grub CLI via IPMI sol I am unable to use the arrow keys, as well as some keys such as delete. What happens when I press the Left key I get random 'D' characters appearing, even ...
TaylorSanchez's user avatar

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