Re: [gentoo-user] re: can't find /boot/grub/grub.conf after kernel upgrade [3.10.7]

[meino.cramer@gmx.de]

Alexander Kapshuk <alexander.kapshuk@gmail.com> [13-09-07 23:14]:
> On 09/07/2013 11:11 PM, Canek Peláez Valdés wrote:
> >On Sat, Sep 7, 2013 at 2:41 PM, Alexander Kapshuk
> ><alexander.kapshuk@gmail.com>  wrote:
> >   
> >>On 09/07/2013 10:35 PM, Canek Peláez Valdés wrote:
> >>     
> >>>On Sat, Sep 7, 2013 at 2:30 PM, Alexander Kapshuk
> >>><alexander.kapshuk@gmail.com>  wrote:
> >>>       
> >>>>On 09/07/2013 10:25 PM, Canek Peláez Valdés wrote:
> >>>>         
> >>>>>On Sat, Sep 7, 2013 at 1:53 PM, Alexander Kapshuk
> >>>>><alexander.kapshuk@gmail.com>  wrote:
> >>>>>           
> >>>>>>On 09/07/2013 09:35 PM, Canek Peláez Valdés wrote:
> >>>>>>             
> >>>>>>>On Sat, Sep 7, 2013 at 1:24 PM, Alexander Kapshuk
> >>>>>>><alexander.kapshuk@gmail.com>  wrote:
> >>>>>>>               
> >>>>>>>>On 09/07/2013 09:11 PM, Canek Peláez Valdés wrote:
> >>>>>>>>                 
> >>>>>>>>>On Sat, Sep 7, 2013 at 1:06 PM, Alexander Kapshuk
> >>>>>>>>><alexander.kapshuk@gmail.com>  wrote:
> >>>>>>>>>                   
> >>>>>>>>>>Howdy,
> >>>>>>>>>>
> >>>>>>>>>>Just compiled the new kernel [3.10.7], was about to edit my
> >>>>>>>>>>/boot/grub/grub.conf, and found it missing:
> >>>>>>>>>>box0 boot # pwd
> >>>>>>>>>>/boot
> >>>>>>>>>>box0 boot # ls -a
> >>>>>>>>>>.  ..  kernel-3.10.7-gentoo  kernel-3.8.13-gentoo
> >>>>>>>>>>
> >>>>>>>>>>What did I miss?
> >>>>>>>>>>                     
> >>>>>>>>>Do you have /boot in a separated partition? Did you mounted 
> >>>>>>>>>it?
> >>>>>>>>>
> >>>>>>>>>Nothing should touch /boot, AFAIK.
> >>>>>>>>>
> >>>>>>>>>Regards.
> >>>>>>>>>                   
> >>>>>>>>I do have '/boot' on a separate partition. If I understand it 
> >>>>>>>>correctly,
> >>>>>>>>'/boot' gets mounted every time at system start-up, based on
> >>>>>>>>'/etc/fstab', does it not?
> >>>>>>>>                 
> >>>>>>>By the contents of your fstab, it should...
> >>>>>>>
> >>>>>>>               
> >>>>>>>>box0 boot # cat /etc/fstab
> >>>>>>>><snip>
> >>>>>>>>/dev/sda1        /boot        ext2        default,noatime    0 
> >>>>>>>>2
> >>>>>>>>/dev/sda2        none        swap        sw        0 0
> >>>>>>>>/dev/sda3        /        ext4        noatime        0 1
> >>>>>>>>/dev/sda5        /home        ext4        noatime            0 
> >>>>>>>>2
> >>>>>>>>/dev/cdrom        /mnt/cdrom    auto        noauto,ro    0 0
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>box0 boot # mount|grep /dev/sda
> >>>>>>>>/dev/sda3 on / type ext4 (rw,noatime,data=ordered)
> >>>>>>>>/dev/sda5 on /home type ext4 (rw,noatime)
> >>>>>>>>                 
> >>>>>>>,,,however mount says up there that it's not mounted.
> >>>>>>>
> >>>>>>>               
> >>>>>>>>box0 boot # fdisk -l /dev/sda
> >>>>>>>>
> >>>>>>>>Disk /dev/sda: 250.1 GB, 250059350016 bytes, 488397168 sectors
> >>>>>>>>Units = sectors of 1 * 512 = 512 bytes
> >>>>>>>>Sector size (logical/physical): 512 bytes / 512 bytes
> >>>>>>>>I/O size (minimum/optimal): 512 bytes / 512 bytes
> >>>>>>>>Disk identifier: 0x00000000
> >>>>>>>>
> >>>>>>>>    Device Boot      Start         End      Blocks   Id  System
> >>>>>>>>/dev/sda1   *        2048       67583       32768   83  Linux
> >>>>>>>>/dev/sda2           67584     1116159      524288   82  Linux 
> >>>>>>>>swap / Solaris
> >>>>>>>>/dev/sda3         1116160    43059199    20971520   83  Linux
> >>>>>>>>/dev/sda4        43059200   488397167   222668984    5  
> >>>>>>>>Extended
> >>>>>>>>/dev/sda5        43061248   488397167   222667960   83  Linux
> >>>>>>>>                 
> >>>>>>>For some reason your /boot partition didn't get mounted. See the 
> >>>>>>>boot
> >>>>>>>logs, and try to mounting by hand. Perhaps the fsck failed or it 
> >>>>>>>needs
> >>>>>>>manual intervention.
> >>>>>>>
> >>>>>>>Regards.
> >>>>>>>               
> >>>>>>Based on the 'dmesg' output below, EXT2-fs attempted to mount the 
> >>>>>>'/'
> >>>>>>partition instead of the '/boot' one.
> >>>>>>
> >>>>>>box0 ~ # dmesg|grep 'EXT.*fs'
> >>>>>>[    2.444214] EXT2-fs (sda3): error: couldn't mount because of
> >>>>>>unsupported optional features (240)
> >>>>>>[    2.444736] EXT4-fs (sda3): couldn't mount as ext3 due to 
> >>>>>>feature
> >>>>>>incompatibilities
> >>>>>>[    2.481412] EXT4-fs (sda3): mounted filesystem with ordered 
> >>>>>>data
> >>>>>>mode. Opts: (null)
> >>>>>>[    9.448819] EXT4-fs (sda3): re-mounted. Opts: (null)
> >>>>>>[    9.731383] EXT4-fs (sda5): mounted filesystem with ordered 
> >>>>>>data
> >>>>>>mode. Opts: (null)
> >>>>>>
> >>>>>>Would that suggest a corrupted /boot/grub/grub.conf file?
> >>>>>>             
> >>>>>Not necessarily. Can you manually mount /boot and see the contents 
> >>>>>of
> >>>>>/boot/grub/grub.conf.
> >>>>>
> >>>>>           
> >>>>>>How did the system boot then?
> >>>>>>             
> >>>>>If grub can see the boot partition (and is correctly configured 
> >>>>>and
> >>>>>installed on the MBR), it can mount the root system without 
> >>>>>problems
> >>>>>regardless of fstab. Do you use an initramfs?
> >>>>>
> >>>>>Regards.
> >>>>>           
> >>>>'mount /boot' fails:
> >>>>box0 ~ # mount /boot
> >>>>mount: wrong fs type, bad option, bad superblock on /dev/sda1,
> >>>>        missing codepage or helper program, or other error
> >>>>        In some cases useful info is found in syslog - try
> >>>>        dmesg | tail or so
> >>>>
> >>>>No, I do not use 'initfamfs'.
> >>>>
> >>>>What do you suggest doing?
> >>>>         
> >>>Mounting it by hand:
> >>>
> >>>mount -t ext2 /dev/sda1 /boot
> >>>
> >>>Regards.
> >>>       
> >>That did the trick. Thanks very much.
> >>
> >>Here's my /boot/grub/grub.conf:
> >>box0 linux # cat /boot/grub/grub.conf
> >># This is a sample grub.conf for use with Genkernel, per the Gentoo 
> >>handbook
> >>#
> >>http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?part=1&chap=10#doc_chap2
> >># If you are not using Genkernel and you need help creating this 
> >>file, you
> >># should consult the handbook. Alternatively, consult the
> >>grub.conf.sample that
> >># is included with the Grub documentation.
> >>
> >>default 0
> >>timeout 30
> >>splashimage=(hd0,0)/boot/grub/splash.xpm.gz
> >>
> >>title Gentoo Linux 3.8.13
> >>root (hd0,0)
> >>kernel /boot/kernel-3.8.13-gentoo root=/dev/sda3
> >>#initrd /boot/initramfs-genkernel-x86-2.6.24-gentoo-r5
> >>
> >>title Gentoo Linux 3.8.13 (rescue)
> >>root (hd0,0)
> >>kernel /boot/kernel-3.8.13-gentoo root=/dev/sda3 init=/bin/bb
> >># vim:ft=conf:
> >>
> >>Is there anything that suggests as to why the /boot partition failed 
> >>to
> >>mount at system start-up?
> >>     
> >No, I don't see anything that. However, since you cannot "mount
> >/boot", but doing it manually works, that means something is wrong
> >with your fstab. Can I see it again? There is no /boot/etc/fstab,
> >right? What does /boot/grub/device.map say?
> >
> >Regards.
> >   
> Getting late. I'll have to chase it up tomorrow. Sorry.
> 
> Thanks heaps for your help.
> 
> I'll keep yourself and the list posted on the progress made.
> 
> 

Hi,

the problem is in your fstab:

You try first to mount /boot before mounting root "/"....
Cant work...

Try this one:
/dev/sda3        /        ext4        noatime        0 1
/dev/sda1        /boot        ext2        default,noatime    0 2
/dev/sda2        none        swap        sw        0 0
/dev/sda5        /home        ext4        noatime            0 2
/dev/cdrom        /mnt/cdrom    auto        noauto,ro    0 0


best regards,
mcc