5 :: How To Start Up CentOS Without GRUB
Jan 28, 2011
I'm a freelance now. so i installed CentOS in a portable hard disk for the convenient i move to new place and start my job.
But i found the grub of CentOS is installed on ...uhm... my Computer(?)...actually on my first Hard Disk(start up windows with MBR). and maybe the data of grub was installed on my portable hd. so i can't start CentOS on another computer and i even can't start windows without portable device...
so... is there any way to start up this OS without GRUB? or where should i pay more attention to when setting up to let CentOS could be moveable?
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Apr 28, 2011
I installed CentOS 5.6 and there was an error, so once it finished, I reburned the cds and installed it again. Now When I start up the cpu, GNU Grub comes up. Version 0.97 (640K lower/2096864K upper memory). How do I get the OS to start up. When i type in boot, I get error 8: Kernel must be loaded before booting".[Moderator edit: Fixed tyop in Subject.]
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Jun 22, 2010
If I use the super grub disk I can get to my ubuntu partition otherwise my windows partition boots automatically. I spent over an hour in the community documentation using the live cd to reinstall grub and nothing has fixed it. I think that grub is installed and the windows bootloader is just taking precedence.
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Sep 2, 2010
I'm configuring a new Centos 5.5 server in replacement of an old W2K server.The topology of our network is simple : one file/dhcp/dns relay server and workstations (PC's and some MAC's) plus network printers and scanners.All the workstations have dynamic IP addresses (easier because a lot of 'dynamic' changes : new persons with their own laptop, ...) and the server and printers/scanners have fixed IP addresses.I edited the dhcpd.conf (see here underneath), I have the file dhcpd.leases but it doesn't start !
DHCPD.CONF
ddns-update-style interim;
ignore client-updates;
[code].....
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Mar 21, 2011
I have used CentOS for a while and have never run into this issue. I searched all over and didn't see a similar issue anywhere, I did an install of CentOS as a server (no GUI) with only the base. Partition is /boot ext3, size of 100MB. The rest of the drive is partitioned as / with ext3. This is being done on a CompactFlash card of 32GB in size. The BIOS sees it as an IDE drive.
When the install completes and the system reboots, the grub stops at the grub> prompt. There is no menu for OS options. If I do the following commands:
grub>root (hd0,0)
grub>kernel /vmlinuz-2.6.18-194.el5 root=LABEL=/
grub>initrd /initrd-2.6.18-194.el5.img
grub>boot
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May 11, 2011
i am currently trying to install vsFTP onto my new linux server and btw i just started using linux today this is my first time using linux so i got the ftp installed good it got downloaded and everything then i went to open a port for my server for vsFTP i used this comand to open it "-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT" then i closed it by pressing ESC then :wq! and it brought me back to my comand line again so now when i try to start the ip table thing with the comand "service iptables start" then when i execute that comand putty respondes with this "Applying iptables firewall rules: iptables-restore: line 1 failed [FAILED]"
The install Guide im using: [URL]
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May 5, 2009
I'm trying to install a dual booting machine with OpenSUSE v11.1 32bit and CentOS v5.2 64bit. I installed OpenSUSE first and allowed it to install and configure grub in the MBR and after that I wanted to proceed with CentOS v5.2. The installation went fine with two notable exceptions:- when I had to configure grub installation parameters, CentOS offered me only 2 solutions: either install it on the MBR of the first hard disk or not installing it at all. Other distributions are more flexible allowing you to install it in the boot sector of the root partition for example. Because I didn't want to ruin the existent grub onfiguration, I reluctantly accepted not to install it for CentOS assuming that I could manually configure the entry later in grub's menu.lst file.
- when I was presented with the options for software components installation, I've clicked on virtualization category/function because I intend to use the machine as a VMware host. There was no guidance on screen at that point and I blindly assumed that by choosing the virtualization function I would get necessary tools and drivers that will help me further on. It seems that this was a wrong move as you can see it below.
After completing the installation, I tried to search for a template or guiding on how the menu entry in menu.lst should look like but the grub directory was empty, not surprisingly because I've told CentOS earlier not to install it. Using the files in the /boot directory from the CentOS installation I tried to improvise a menu entry but it's not working. The boot stops with famous Error 13: Invalid or unsupported executable format. Using the file command to check what kind of files I'm trying to load as kernels I'm getting :
marte:~ # file /mnt/vmlinuz-2.6.18-92.el5xen
/mnt/vmlinuz-2.6.18-92.el5xen: gzip compressed data, from Unix, last modified: Tue Jun 10 19:20:51 2008, max compression
[code]....
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Nov 10, 2009
I just upgraded by box from Fedora Core 9 to Centos 5.2. Finally!I have a 500GB SATA drive, it's partitioned into three equal size slices, hda1 through 3. The old Fedora was on hda1, I installed the new Centos on hda3. I instructed the installer to write the MBR to /dev/hda, not /dev/hda3. Fdisk says I have sector 0 unused.First, the system wouldn't boot - it just looped through the BIOS, rebooting over and over again. The BIOS sees the disk, but it never loaded Grub. I tried re-running grub-install /dev/hda, and not I get a Grub Error 17 after stage 1.5 loads.
I can boot from rescue OK, the grub.conf man menu.lst look fine, it's pointing to "root (hd0,2)". It's either the BIOS that can't find the MBR, or the MBR can't find Grub.When I looked at the disk with fdisk after the install, hda1 was still marked bootable, hda3 was not, so I swapped bootable flags but that has not made a difference. I also appended the new grub to the old grub thinking I could get the MBR (if it is there) to load the old grub and thence find the new Centos, but that didn't work either.Mobo is an old Shuttle AK35.Any ideas? Did I mess up by not telling the system to put the MBR on /dev/hda3? Is there a way to fix this without reinstalling?
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Feb 22, 2011
Ive installed centos freebsd and mandriva but i want to manage grub from my centos and y create successfully a boot load for freebds. But for mandriva it just doesnt work... so how can a create a boot load entry for mandriva from grub centos?
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Sep 19, 2010
3 partitions (in order): Windows 7, CentOS and shared data partition.
I need to increase the size of the Windows 7 partition (c:windowswinsxs seems to be something not easily remedied).
GParted didn't work in moving things around (bad sector) so I wiped out its partition (# 2 out of 3) and I was able to increase the size of the Windows 7 partition (I can reinstall CentOS easily and not much work lost).
Except ... no more grub menu (unsurprising). This incantation does allow me to boot into Windows 7.
Is there any way of rebuilding the grub menu short of reinstalling CentOS (5.5)?
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Apr 8, 2009
i restore Centos from backup file,after i have finished,i start centos, it can't start and repost error: IO-APIC + timer doesn't work! Boot with apic=debug and send a report. Then try booting with the 'noapic' option
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Apr 15, 2010
pulled up an old clunker and put centos 5.4 on it the other day. well the grub spash screen appears but i have to manually hit enter to select a kernel.at the /boot/grub/grub.conf file and timeout=5. this is a new install. so I tried changing that value to 0 and it does boot the kernel immediately but never displays the splash screen. so something is not right I assume. btw I see a message (loading stage 2) for about 20 seconds as the computer boots and I have never seen that message on my ubuntu machine, so I wonder if something is off there.
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Jul 1, 2010
I installed following this guide but not install a boot loader, because only use this disk (hdd) with centosAfter the installation, restart and I have the following message "missing operating system"any suggestions to solve this problem?or centos can not install without grub?
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Jan 13, 2010
How to start in runlevel 3 with grub 2?
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Jan 3, 2011
I have recently re-installed Ubuntu and this time GRUB won't show up and will automatically start Windows. How do I fix this?
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Jan 24, 2011
A friend of mine installed ubuntu 10.10 alongside with Windows XP. During the installation he manually edited partitions. Now, the grub loader does not start, and in order to start ubuntu he has to use live cd to choose "boot from first hard drive" in the menu. Windows XP is missing from the boot options.
See the output of "fdisk -l" below (he has two identical hard drives). It looks like a big mess. Any idea where to start fixing this?
Disk /dev/sda: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x05c605c5
[Code]...
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Apr 20, 2011
I don't see grub at start. I have grub-pc installed.
Ubuntu is the only OS installed on this machine.
I don't have a /etc/boot/grub/menu.lst or a /boot/grub/menu.lst file either.
What's going on?
10.10 64bits
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Apr 28, 2011
When I try to enter Windows from GRUB my computer displays a black screen and then I'm back to GRUB. It's impossible for me to enter my Windows XP partition.
sudo fdisk -l:
Quote:
/dev/sda1 * 1 52930 425160193+ 7 HPFS ou NTFS
/dev/sda2 52931 60802 63224256+ f Win95 (LBA) Parti��o Extendida
/dev/sda5 52931 53251 2571514+ 7 HPFS ou NTFS
/dev/sda6 53251 60281 56470528 83 Linux
[Code]....
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Apr 29, 2015
I did an install of Jessie on a Macbook 2,1 to be the machine's only operating system, but it won't boot, showing only a black screen with a blinking cursor. I think the problem is caused by a mistake I made during the installation process, where I selected yes for the prompt:This machine's firmware has started the installer in UEFI mode but it looks like there may be existing operating systems already installed using "BIOS compatibility mode". If you continue to install Debian in UEFI mode, it might be difficult to reboot the machine into any BIOS-mode operating systems later.
If you wish to install in UEFI mode and don't care about keeping the ability to boot one of the existing systems, you have the option to force that here. If you wish to keep the option to boot an existing operating system, you should choose NOT to force UEFI installation here. Force UEFI installation?
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Apr 12, 2010
I've installed Fedora 12 from usb to my laptop. But, on start up a b&w grub screen occurs. (I think there is where we chose the kernel for booting?)
When I start the the system from usb ordinary multi-boot screen comes and let me choose which operating system that i would like to start.
Do i have to start from usb all the time?
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May 27, 2010
Fedora 13..Please advise how to start the grub menu at boot? [ESC]/[Shift] etc. without function.
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Aug 3, 2010
I'm new to the world of dual booting Ubuntu. My computer is currently running windows 7 64-bit, and I'm trying to install Ubuntu 32-bit to run beside it. So I've created a boot disk, and I try to install Ubuntu. The weird thing is when I get to the frame that says "Prepare disk space" it correctly shows that I have windows 7 on the computer, but it shows it's on the wrong drive. In fact within the Ubuntu installer it doesn't even show the physical drive that windows is on, it only find the other two drives. If I load up System > Administration > Disk Utility then I can see all 3 physical hard drives and all the partitions on them, but not under the Ubuntu installer.
So I tried installing Ubuntu onto one of the other physical hard drives and that seemed to go just fine. The only problem is now when I boot, the only way I can swap operating systems is to go into my BIOS and change the boot order of my hard drives. If the hard drive with Windows is higher in the boot priority, it will boot windows, no problem. If the hard drive with Ubuntu on it is higher, then it takes me to grub, where it correctly shows windows 7 and ubuntu. Only problem is when I choose windows 7 all I get is a blinking cursor and nothing happens.
If I choose Ubunutu it boots correctly and everything works. So in a way I do kind of have them both working, but it'd be nice not to have to go into my BIOS just to change operating systems. I'm guessing that grub's problem is that the Ubuntu installer identifies the wrong drive that Windows is installed on, so when I pick Windows from grub it goes to the wrong drive. Can I fix grub manually? Or is there some compatibility issue between Windows 7 64-bit and Ubuntu 32-bit that is causing this conflict?
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May 20, 2011
I recently plugged the hard drive from my parents' old computer into my computer's motherboard to copy some files (it's an IDE drive if that makes a difference). I copied all the old family photos and whatnot into a folder on my Vista 64bit desktop which runs off of my computer's main hard drive. I shut the computer down and unplugged the old IDE drive and tried to start it up again. After going through the typical start up screens it gets stuck on a black screen that says:"error: no such device: 66727dd9 (morenumbers).e3cbf9f71233grub rescue>_"the cursor is blinking where the underscore is. Typically, it would go to the screen where I choose whether I want to run ubuntu 10.10 or vista.I went into boot preferences and everything looks okay.. I tried plugging the hard drive into different ports on the mobo and still nothing. All my useful files are in the Vista partition of my hard drive so I'm fine with wiping everything and doing a fresh install of both vista and ubuntu so long as I can keep those files. Does anyone know what could be causing this? I've never heard of "grub rescue"
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May 23, 2011
I'm trying to install Natty from a USB thumb drive on a SATA SSD. My main system is OS X. The method to create an instal USB disk on the download page didn't yield a bootable disk (the partition was readble, with the right files, but GRUB never started). The quick method from the clemsonlinux wiki gave me a minimal bootable drive, though.From there, I tried to install Natty on my SSD.
Once again, the partitioning process appears to work fine, the files are copied, no problem, but the GRUB install fails silently.I think that the problem comes from the fact that, when I boot from the USB drive (even if the SSD is set as the first boot device), the SSD ends up at /dev/sdb, whereas it would be at /dev/sda if the machine could be booted from the SSD.I chose the automatic partitioning method and ends up with sda1 (/), sda2 (ext) and sda5 (swap).If I launch the installer in recovery mode and ask to mount /dev/sdb1 as root, mount reports that sda1 is / (sda1 doesn't even exist), but blkid reports the SSD as /dev/sdb.
The output of the boot_inf_script is clearly pathological, but I didn't manage to get it out of the machine with what I have (gmail is broken in lynx).I've also tried to install LILO instead of GRUB. LILO boots, but doesn't find /dev/sdb (which is now /dev/sda) and gives me a busybox prompt.I've tried to install GRUB from there, but, once again, I get a black screen at boot time.
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Dec 28, 2010
i installed ubuntu 10.10 netbook edition and it installed fine, i updated everything on and now when it starts i have 2 versions of it to select from 2.6.35-22 and 2.6.35-24 as well as the recovery versions of it. how do i remover these options from the grub menu? in addition to this i also have a question about updating python on it, its running version 2.6.6 and i need 3.x. how do i upgrade it?
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Jun 1, 2010
I move to Centos in October 2009 from Windoze and machines with 36 bit words. I now have 3 servers with Centos 5.5, 5.5. and 5.2 plus a laptop with 5.4 and am currently trying to put Centos on a 10.2" Netbook running Win XP.
On two 5.5 servers I notice a different graphical start-up process. One starts, from the text announcement "Centos 5.5 Final" with a blue Centos screen. If one displays the text it is shown with a thick blue Centos coloured border. The other starts up with text and stays in text mode until it has displayed the text log-in prompt and then after a few seconds presents the Centos GUI log-in screen.
My question is how can I make both servers, both ostensibly running the identical operating system, behave identically ?
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Oct 28, 2009
i've made a big update of almost 300Mb.I'had a working DNS server.Now, when i boot the box, named works and it resolves all the clients.If i make any change (enter a new client for example) and of course i restart named (service named restart), named stop but does not start again !!!In order to get a working named, i 'm obliged to reboot the box?
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Nov 8, 2009
For some applications i still have windows XP installed. Because of the fact that Windows has to be reinstalled once a year (it's only windows ) I deleted the MBR accidentely. Now I can't start Fedora again. hen I start Linux using the Installation CD of Fedora 10 my partition is not mounted automatically because I am using LVM.
[code]...
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Jan 24, 2010
Just upgraded to 9.10 on a laptop with dead Vista which I lost when I moved over to UBUNTU some time ago. Never any problems but when fiddling at boot up tonight I accidentally selected to boot up the Vista loader which went into the Vista recovery, and since then the laptop only opens up the Vista Recovery, ie it does not go to the Grub. Any ideas on how I can get to boot UBUNTU again?
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Jan 27, 2010
Right, so I've looked high and low for the answer to this problem and haven't found it, although I've found a million and a half threads about grub especially when it comes to dual booting windows. Which I'm not. What I am though, I suspect, is an idiot who shouldn't mess around with my computer at 4 am.
So the problem is every time I turn on my pc, grub tells me it can't find a file system and goes into recovery mode. Can't boot into ubuntu at all. Am using the live disk to type this.
I also think I know why grub is doing this, I was dual booting windows before, I had windows installed originally, added ubuntu to a new partition. Was having problems with grub. Figured that reinstalling it wouldn't be a bad idea, it might fix it. In that process I did something rather stupid, I accidentally installed grub to my other internal hard drive. There is no operating system on it. Just movies, music, etc. The problem, I think, is that my second hard drive is sda, and the one with my os is sdb, which I suspect means that grub is loading from sda and finding no operating system, rather than from sdb. (It's like that because my larger drive wouldn't fit into the sda slot on my computer, long story.) How do I remove grub from sda?
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