Re: [gentoo-user] Another plan for /usr and udev-181
On Fri, 13 Apr 2012 18:44:37 -0700, fe...@crowfix.com wrote: What annoys me the most about this forced change is that I like the old unix style of a single minimal base partition for booting, and being able to manage all the other partitions while unmounted in single user mode. In my case, /usr is an LVM partition precisely because I want to sit in single user mode while resizing it (it seems to keep on growing ...). It's been safe to increase the size of mounted filesystems for years. But if you can enlarge /usr while using it, you can do the same for/. So if that's your only reason for a separate /usr... -- Neil Bothwick In a classified ad: Tired of cleaning yourself? Let me do it. signature.asc Description: PGP signature
Re: [gentoo-user] Another plan for /usr and udev-181
On Fri, 13 Apr 2012 18:44:37 -0700, fe...@crowfix.com wrote: 6. Merge udev-181 and whatever else is needed. 7. Cross my fingers, sacrifice a virtual goat, and try a reboot. Somewhere between 6 and 7 is the worst part; no simple way to revert and retry. Everything up til then should require no more than a simple /etc/fstab edit. Is there any way to add more steps between 6 and 7 to allow more reversability? Create a binary package for the old udev, then you can boot from a live CD, chroot in and emerge the old version. If the breakage is too bad for even that, you can even untar the package into the root directory. -- Neil Bothwick Of course it's not your day, signature.asc Description: PGP signature
Re: [gentoo-user] Another plan for /usr and udev-181
On Friday 13 April 2012 18.44:37 fe...@crowfix.com wrote: 1. Configure the next kernel with the necessary initramfs flags, then have two grub entries for the same kernel: one with the initramfs and one without. Initially I will make the initramfs do something innocuous, and leave /usr as a separate /etc/fstab entry mounted in the old fashioned way. 2. Make sure boot works the old fashioned way, without initramfs. 3. Make sure boot works the new fangled way, with initramfs. 4. Create some temporary lvm partition and make sure the new fangled initramfs mounts it during boot without an /etc/fstab entry. 5. Remove /usr from /etc/fstab and put it in the initramfs, and make sure that boot works. 6. Merge udev-181 and whatever else is needed. 7. Cross my fingers, sacrifice a virtual goat, and try a reboot. Somewhere between 6 and 7 is the worst part; no simple way to revert and retry. Everything up til then should require no more than a simple /etc/fstab edit. Is there any way to add more steps between 6 and 7 to allow more reversability? Have I left out any steps, between 6 and 7 or anywhere else? I have done also something like this. I still have /usr in fstab (with the noauto option) just for reference. The only thing (that I have noticed yet) is that the /etc/init.d/lvm fails due to the fact that LVM is already started (in initramfs). -- Dan Johansson, http://www.dmj.nu *** This message is printed on 100% recycled electrons! ***
Re: [gentoo-user] Another plan for /usr and udev-181
On Sat, 14 Apr 2012 07:35:52 +0100 Neil Bothwick n...@digimed.co.uk wrote: On Fri, 13 Apr 2012 18:44:37 -0700, fe...@crowfix.com wrote: What annoys me the most about this forced change is that I like the old unix style of a single minimal base partition for booting, and being able to manage all the other partitions while unmounted in single user mode. In my case, /usr is an LVM partition precisely because I want to sit in single user mode while resizing it (it seems to keep on growing ...). It's been safe to increase the size of mounted filesystems for years. But if you can enlarge /usr while using it, you can do the same for/. So if that's your only reason for a separate /usr... / on LVM is officially not supported (in the sense there are no official documentation about it) in Gentoo, and is discouraged in the Gentoo LVM installation guide. Has been the case since the beginning, although there are unofficial wiki and mailinglist/forum posts about it. Of course, / on LVM would require an initrd. That's one reason why many of us using LVM keeps /usr on LVM while / as a physical partition. This allows for maximum flexibility, and is a supported legacy config without an initrd. I may add many of us had bad experience with initrd from binary distros rendering system unbootable (I've been there with Debian and Arch --- back in 2003 or so you cannot uninstall currently running kernel initrd after installing a new kernel, or else the next time your newly installed kernel won't boot. Also sometimes the newly installed kernel+initrd won't boot, and neither would the old kernel+initrd...). Of course, now that separate /usr requires an initrd, one might as well put / on LVM and let busybox in initrd handles the case when LVM goes wrong (urgh!). Still, Gentoo doesn't officially support this configuration. -- Kerwin signature.asc Description: PGP signature
Re: [gentoo-user] Another plan for /usr and udev-181
On Sat, Apr 14, 2012 at 06:35:45PM +0800, kwk...@hkbn.net wrote: On Sat, 14 Apr 2012 07:35:52 +0100 Neil Bothwick n...@digimed.co.uk wrote: On Fri, 13 Apr 2012 18:44:37 -0700, fe...@crowfix.com wrote: What annoys me the most about this forced change is that I like the old unix style of a single minimal base partition for booting, and being able to manage all the other partitions while unmounted in single user mode. In my case, /usr is an LVM partition precisely because I want to sit in single user mode while resizing it (it seems to keep on growing ...). It's been safe to increase the size of mounted filesystems for years. But if you can enlarge /usr while using it, you can do the same for/. So if that's your only reason for a separate /usr... / on LVM is officially not supported (in the sense there are no official documentation about it) in Gentoo, and is discouraged in the Gentoo LVM installation guide. Has been the case since the beginning, although there are unofficial wiki and mailinglist/forum posts about it. Of course, / on LVM would require an initrd. That's one reason why many of us using LVM keeps /usr on LVM while / as a physical partition. This allows for maximum flexibility, and is a supported legacy config without an initrd. That's my position :-) and half-hoping all this udev-181 needing /usr stuff will disappear and I can go back ... -- ... _._. ._ ._. . _._. ._. ___ .__ ._. . .__. ._ .. ._. Felix Finch: scarecrow repairman rocket surgeon / fe...@crowfix.com GPG = E987 4493 C860 246C 3B1E 6477 7838 76E9 182E 8151 ITAR license #4933 I've found a solution to Fermat's Last Theorem but I see I've run out of room o
Re: [gentoo-user] Another plan for /usr and udev-181
On Sat, Apr 14, 2012 at 09:13:09AM +0200, Dan Johansson wrote: I have done also something like this. I still have /usr in fstab (with the noauto option) just for reference. Good idea, better than commenting it out. The only thing (that I have noticed yet) is that the /etc/init.d/lvm fails due to the fact that LVM is already started (in initramfs). I suppose this is just a harmless error message, instead of getting so confused it makes a mess of things. -- ... _._. ._ ._. . _._. ._. ___ .__ ._. . .__. ._ .. ._. Felix Finch: scarecrow repairman rocket surgeon / fe...@crowfix.com GPG = E987 4493 C860 246C 3B1E 6477 7838 76E9 182E 8151 ITAR license #4933 I've found a solution to Fermat's Last Theorem but I see I've run out of room o
Re: [gentoo-user] Another plan for /usr and udev-181
On Fri, Apr 13, 2012 at 8:44 PM, fe...@crowfix.com wrote:
Dale as inspired me to finally do something about udev-181. Can't
keep my finger in the dike forever. But I have been thinking of a
different approach.
What annoys me the most about this forced change is that I like the
old unix style of a single minimal base partition for booting, and
being able to manage all the other partitions while unmounted in
single user mode. In my case, /usr is an LVM partition precisely
because I want to sit in single user mode while resizing it (it seems
to keep on growing ...). However, progress marches on, removable
media are taking over, and it's best to not be a luddite all the time.
So I think I will try the initramfs approach of mounting /usr during
boot. I don't think this will make growing /usr any easier; single
user mode won't umount it.
Mmmh. You don't need single user mode anymore with an initramfs (at
least with dracut). From dracut.cmdline(7):
rd.break={cmdline|pre-udev|pre-trigger|initqueue|pre-mount|mount|pre-pivot}
drop to a shell on defined breakpoint
You add that to your kernel command line in GRUB/GRUB2, and it drops
you tou a shell before doing the mount (pre-mount). Then you only need
to put the necessary LVM tools in the initramfs; since my LVM
installation is 3.13 MB, it sounds like a reasonable feature. Or you
can have a fat initramfs (with another GRUB entry) for resizing LVM
volumes, and a slim normal initramfs with its corresponding GRUB
entry.
Other way in which (IMHO) an initramfs is a better option that
stuffing everything and the kitchen sink on /.
My 0.02 ${CURRENCY}.
Regards.
--
Canek Peláez Valdés
Posgrado en Ciencia e Ingeniería de la Computación
Universidad Nacional Autónoma de México
Re: [gentoo-user] Another plan for /usr and udev-181
On Fri, Apr 13, 2012 at 11:03:43PM -0500, Canek Pel??ez Vald??s wrote:
Mmmh. You don't need single user mode anymore with an initramfs (at
least with dracut). From dracut.cmdline(7):
rd.break={cmdline|pre-udev|pre-trigger|initqueue|pre-mount|mount|pre-pivot}
drop to a shell on defined breakpoint
You add that to your kernel command line in GRUB/GRUB2, and it drops
you tou a shell before doing the mount (pre-mount). Then you only need
to put the necessary LVM tools in the initramfs; since my LVM
installation is 3.13 MB, it sounds like a reasonable feature. Or you
can have a fat initramfs (with another GRUB entry) for resizing LVM
volumes, and a slim normal initramfs with its corresponding GRUB
entry.
Other way in which (IMHO) an initramfs is a better option that
stuffing everything and the kitchen sink on /.
Interesting stuff. I see I had better get familiar with dracut and
maybe try some things out.
Back in the stone age, there was no kitchen sink to put in /bin :-)
--
... _._. ._ ._. . _._. ._. ___ .__ ._. . .__. ._ .. ._.
Felix Finch: scarecrow repairman rocket surgeon / fe...@crowfix.com
GPG = E987 4493 C860 246C 3B1E 6477 7838 76E9 182E 8151 ITAR license #4933
I've found a solution to Fermat's Last Theorem but I see I've run out of room o
