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ts1971
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PostPosted: Sat Oct 20, 2012 7:51 pm    Post subject: Can't write grub.conf + dual boot questions Reply with quote

Hi,

I'm at the point in the installatoin where I"ve emerged grub but not yet installed it. I'm trying to get grub.conf sorted out but I have a couple of issues. I think that I had the gentoo stuff sorted out but I was a bit confused at the end with the dual boot stuff and specifically wihch partition rootnoverify should specify. I had inteded to save what I had and include it in the post but that brings me to the second issue which is that I was unable to save the file because apparently the filesystem was mounted read only. It's not clear to me why though.

Here is my partition table:

Code:


sysresccd / # fdisk /dev/sda
Welcome to fdisk (util-linux 2.21.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


The device presents a logical sector size that is smaller than
the physical sector size. Aligning to a physical sector (or optimal
I/O) size boundary is recommended, or performance may be impacted.

Command (m for help): p

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0xd45a1e8d

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     3074047     1536000    7  HPFS/NTFS/exFAT
/dev/sda2         3074048   318081023   157503488    7  HPFS/NTFS/exFAT
/dev/sda3       948099072   976771071    14336000    7  HPFS/NTFS/exFAT
/dev/sda4       318081024   948099071   315009024    5  Extended
/dev/sda5       318083072   318148607       32768   83  Linux
/dev/sda6       318150656   334927871     8388608   82  Linux swap / Solaris
/dev/sda7       334929920   641114111   153092096   83  Linux

Partition table entries are not in disk order

Command (m for help):


where /dev/sda5 is the boot partition I crteated for gentoo and /dev/sda7 is the /root. The windows stuff should be obvious.

Here is /etc/fstab:

Code:


sysresccd / # cat /etc/fstab
# /etc/fstab: static file system information.
#
# noatime turns off atimes for increased performance (atimes normally aren't
# needed); notail increases performance of ReiserFS (at the expense of storage
# efficiency).  It's safe to drop the noatime options if you want and to
# switch between notail / tail freely.
#
# The root filesystem should have a pass number of either 0 or 1.
# All other filesystems should have a pass number of 0 or greater than 1.
#
# See the manpage fstab(5) for more information.
#

# <fs>         <mountpoint>   <type>      <opts>      <dump/pass>

# NOTE: If your BOOT partition is ReiserFS, add the notail option to opts.
/dev/sda5      /boot      ext2      noauto,noatime   1 2
/dev/sda7      /      ext3      noatime      0 1
/dev/sda6      none      swap      sw      0 0
/dev/cdrom      /mnt/cdrom   auto      noauto,ro   0 0
/dev/fd0      /mnt/floppy   auto      noauto      0 0
sysresccd / #



Help!

Thanks in advance.

-ts1971
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DONAHUE
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PostPosted: Sat Oct 20, 2012 8:16 pm    Post subject: Reply with quote

"apparently the filesystem was mounted read only" probably means that you were trying to run the command from outside the chroot as suggested by the command prompt in your post. It happens a lot.
boot cd
Quote:
mount /dev/sda7 /mnt/gentoo
mount /dev/sda5 /mnt/gentoo/boot
cp /etc/resolv.conf /mnt/gentoo/etc/resolv.conf
mount -t proc none /mnt/gentoo/proc
mount --rbind /sys /mnt/gentoo/sys
mount --rbind /dev /mnt/gentoo/dev
chroot /mnt/gentoo /bin/bash
env-update
source /etc/profile
export PS1="(chroot) $PS1"
ls /boot
got kernel (initramfs system-map if applicable)?
Code:
nano /boot/grub/grub.conf
Code:
nano /etc/fstab
write them and save them.
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ts1971
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PostPosted: Sat Oct 20, 2012 8:24 pm    Post subject: Reply with quote

DONAHUE wrote:
"apparently the filesystem was mounted read only" probably means that you were trying to run the command from outside the chroot as suggested by the command prompt in your post. It happens a lot.
boot cd
Quote:
mount /dev/sda7 /mnt/gentoo
mount /dev/sda5 /mnt/gentoo/boot
cp /etc/resolv.conf /mnt/gentoo/etc/resolv.conf
mount -t proc none /mnt/gentoo/proc
mount --rbind /sys /mnt/gentoo/sys
mount --rbind /dev /mnt/gentoo/dev
chroot /mnt/gentoo /bin/bash
env-update
source /etc/profile
export PS1="(chroot) $PS1"
ls /boot
got kernel (initramfs system-map if applicable)?
Code:
nano /boot/grub/grub.conf
Code:
nano /etc/fstab
write them and save them.


LOL. This has been an ordeal. I've been at it off and on for a week and a half. In any event, I assume that I was supposed to issue the commands you've listed above from a non chrooted environment. Here's what happened:

Code:

sysrescd init.d # mount /dev/sda7 /mnt/gentoo
mount: mount point /mnt/gentoo does not exist


Should I have chrooted first? If so, why would you have me chrooting afterwards. Ugh.

Thanks as always for the help.

-ts1971
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ts1971
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PostPosted: Sat Oct 20, 2012 8:25 pm    Post subject: Reply with quote

DONAHUE wrote:
"apparently the filesystem was mounted read only" probably means that you were trying to run the command from outside the chroot as suggested by the command prompt in your post. It happens a lot.
boot cd
Quote:
mount /dev/sda7 /mnt/gentoo
mount /dev/sda5 /mnt/gentoo/boot
cp /etc/resolv.conf /mnt/gentoo/etc/resolv.conf
mount -t proc none /mnt/gentoo/proc
mount --rbind /sys /mnt/gentoo/sys
mount --rbind /dev /mnt/gentoo/dev
chroot /mnt/gentoo /bin/bash
env-update
source /etc/profile
export PS1="(chroot) $PS1"
ls /boot
got kernel (initramfs system-map if applicable)?
Code:
nano /boot/grub/grub.conf
Code:
nano /etc/fstab
write them and save them.


LOL. This has been an ordeal. I've been at it off and on for a week and a half. In any event, I assume that I was supposed to issue the commands you've listed above from a non chrooted environment. Here's what happened:

Code:

sysrescd init.d # mount /dev/sda7 /mnt/gentoo
mount: mount point /mnt/gentoo does not exist


Should I have chrooted first? If so, why would you have me chrooting afterwards. Ugh.

Thanks as always for the help.

-ts1971
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DONAHUE
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PostPosted: Sat Oct 20, 2012 8:31 pm    Post subject: Reply with quote

I haven't booted every nor the latest sysresccd. they used to have /mnt/gentoo built in.

boot cd,
Code:
mkdir /mnt/gentoo
then as before suggested
Quote:
mount /dev/sda7 /mnt/gentoo
mount /dev/sda5 /mnt/gentoo/boot
cp /etc/resolv.conf /mnt/gentoo/etc/resolv.conf
mount -t proc none /mnt/gentoo/proc
mount --rbind /sys /mnt/gentoo/sys
mount --rbind /dev /mnt/gentoo/dev
chroot /mnt/gentoo /bin/bash
env-update
source /etc/profile
export PS1="(chroot) $PS1"
ls /boot
got kernel (initramfs system-map if applicable)?
Code:
nano /boot/grub/grub.conf
Code:
nano /etc/fstab
write them and save them.
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ts1971
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PostPosted: Sat Oct 20, 2012 8:48 pm    Post subject: Reply with quote

DONAHUE wrote:
I haven't booted every nor the latest sysresccd. they used to have /mnt/gentoo built in.

boot cd,
Code:
mkdir /mnt/gentoo
then as before suggested
Quote:
mount /dev/sda7 /mnt/gentoo
mount /dev/sda5 /mnt/gentoo/boot
cp /etc/resolv.conf /mnt/gentoo/etc/resolv.conf
mount -t proc none /mnt/gentoo/proc
mount --rbind /sys /mnt/gentoo/sys
mount --rbind /dev /mnt/gentoo/dev
chroot /mnt/gentoo /bin/bash
env-update
source /etc/profile
export PS1="(chroot) $PS1"
ls /boot
got kernel (initramfs system-map if applicable)?
Code:
nano /boot/grub/grub.conf
Code:
nano /etc/fstab
write them and save them.


Code:

sysresccd init.d # mkdir /mnt/gentoo
sysresccd init.d # mount /dev/sda7 /mnt/gentoo
sysresccd init.d # mount /dev/sda5 /mnt/gentoo/boot
mount: /dev/sda5 already mounted or /mnt/gentoo/boot busy
mount: according to mtab, /dev/sda5 is mounted on /boot


Should I just skip that line and continue? I apologize for asking for all the hand holding, but frankly at this point I'm completely confused.

-ts1971
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DONAHUE
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PostPosted: Sat Oct 20, 2012 8:53 pm    Post subject: Reply with quote

a little strange
clean up with a reboot of the cd and a do over.
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BillWho
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PostPosted: Sat Oct 20, 2012 9:12 pm    Post subject: Reply with quote

ts1971,

If you encounter that "already mounted" problem again check the output of mount - maybe it is getting mounted :?
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Jickler
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PostPosted: Sat Oct 20, 2012 9:17 pm    Post subject: Reply with quote

Make sure you're running
Code:
mount /dev/sda5 /mnt/gentoo/boot
not
Code:
 mount /dev/sda5 /boot
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ts1971
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PostPosted: Sat Oct 20, 2012 9:26 pm    Post subject: Reply with quote

DONAHUE wrote:
a little strange
clean up with a reboot of the cd and a do over.


Okay, whatever the weirdness was, the reboot solved it. fstab was as already edited. I'm including it here just to make sure the it looks okay.

Code:

(chroot) sysresccd / # cat /etc/fstab
# /etc/fstab: static file system information.
#
# noatime turns off atimes for increased performance (atimes normally aren't
# needed); notail increases performance of ReiserFS (at the expense of storage
# efficiency).  It's safe to drop the noatime options if you want and to
# switch between notail / tail freely.
#
# The root filesystem should have a pass number of either 0 or 1.
# All other filesystems should have a pass number of 0 or greater than 1.
#
# See the manpage fstab(5) for more information.
#

# <fs>         <mountpoint>   <type>      <opts>      <dump/pass>

# NOTE: If your BOOT partition is ReiserFS, add the notail option to opts.
/dev/sda5      /boot      ext2      noauto,noatime   1 2
/dev/sda7      /      ext3      noatime      0 1
/dev/sda6      none      swap      sw      0 0
/dev/cdrom      /mnt/cdrom   auto      noauto,ro   0 0
/dev/fd0      /mnt/floppy   auto      noauto      0 0
(chroot) sysresccd / #



I've also edited grub.conf but it's still unclear to me which partition I should specify to rootnoverify. Here is the file as it stands now:

Code:

(chroot) sysresccd / # 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=(hd0,4)/grub/splash.xpm.gz

title Gentoo Linux 3.4.9
root (hd0,4)
kernel /boot/kernel-genkernel-x86_64-3.4.9-gentoo root=/dev/ram0 real_root=/dev/sda7 video=uvesafb:mtrr:3,ywrap,1024x768-32@85
initrd /boot/initramfs-genkernel-x86_64-3.4.9-gentoo

# vim:ft=conf:

title Windows Something or Other
rootnoverify (hd0,?)
makeactive
chainloader + 1
(chroot) sysresccd / #


So, two questions. Does everything other than the rootnoverify look correct? And given my partition table which is posted upthread, what should I be specifying for the rootnoverify line?

Thanks!

-ts1971
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BillWho
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PostPosted: Sat Oct 20, 2012 9:30 pm    Post subject: Reply with quote

ts1971

rootnoverify (hd0,0) should boot your windows :wink:
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ts1971
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PostPosted: Sat Oct 20, 2012 9:34 pm    Post subject: Reply with quote

BillWho wrote:
ts1971

rootnoverify (hd0,0) should boot your windows :wink:


Thanks Bill.

-ts1971
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ts1971
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PostPosted: Sat Oct 20, 2012 10:10 pm    Post subject: Reply with quote

Okay so after installing grub on the MBR and rebooting gentoo is looking good. Windows ... not so much. Here's the error when I choose windows from the bootloader screen:

Code:

Booting 'Windows Something or Other'
rootnoverify (hd0,0)
makeactive
chainloader + 1

Error 1: Filename must be either an absolute pathname or blocklist

Press any key to continue...


It must be something wrong with my grub.conf, no?

Thanks.

-ts1971
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Jickler
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PostPosted: Sat Oct 20, 2012 10:30 pm    Post subject: Reply with quote

I don't know too much about GRUB and its syntax, this probably isn't your problem and I'm sure someone will come along with the answer, but...
I notice in all the grub examples I see the line is
Code:

chainloader +1

not what you posted, which was:
Code:
 
chainloader + 1
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DONAHUE
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PostPosted: Sat Oct 20, 2012 10:33 pm    Post subject: Reply with quote

good eye jickler
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ts1971
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PostPosted: Sat Oct 20, 2012 11:04 pm    Post subject: Reply with quote

Jickler wrote:
I don't know too much about GRUB and its syntax, this probably isn't your problem and I'm sure someone will come along with the answer, but...
I notice in all the grub examples I see the line is
Code:

chainloader +1

not what you posted, which was:
Code:
 
chainloader + 1


That was it. Thanks a lot Jickler.

-ts1971
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