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parallel-debian: A bit more

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Colin Walters 2011-10-17 16:17:37 -04:00
parent a06f724b72
commit a5a1039c08
1 changed files with 22 additions and 7 deletions
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29
parallel-debian/README-testing-multiroot.md
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@ -5,11 +5,20 @@ Experimenting with multiple roots
<http://wiki.debian.org/QEMU#Setting_up_a_testing.2BAC8-unstable_system>
Follow the steps for making a disk image, downloading the business
card CD, booting it in QEMU and running through the installer.
card CD, booting it in QEMU and running through the installer. Note I
used the QCOW format, since it is more efficient. Here are the steps
I chose:
$ qemu-img create -f qcow2 debian.qcow 2G
$ qemu-kvm -hda debian.qcow -cdrom debian-testing-amd64-businesscard.iso -boot d -m 512
Test that the image works after installation too, before you start
modifying things below! Remember to remove the -cdrom and -boot
options from the installation QEMU command.
options from the installation QEMU command. It should just look like
this:
$ qemu-kvm -hda debian.qcow -m 512
Modifying the image
-------------------
@ -17,8 +26,8 @@ Modifying the image
You now have a disk image in debian.img, and the first partition
should be ext4.
The first thing I did was mount the image, and move almost everythig
(/boot, /var, /etc), except lost+found to a new directory "r0".
The first thing I did was mount the image, and move the "read only"
parts of the OS to a new directory "r0".
$ mkdir /mnt/debian
$ modprobe nbd max_part=8
@ -26,11 +35,11 @@ The first thing I did was mount the image, and move almost everythig
$ mount /dev/nbd0p1 /mnt/debian/
$ cd /mnt/debian
$ mkdir r0
$ DIRS="bin boot dev etc lib lib64 media mnt opt proc root run sbin selinux srv sys tmp usr var"
$ DIRS="bin dev etc lib lib32 lib64 media mnt opt proc root run sbin selinux srv sys tmp usr"
$ mv $DIRS r0
Now with it still mounted, we need to move on to the next part -
modifying the initrd.
Note that /boot, /home and /var are left shared. Now with it still
mounted, we need to move on to the next part - modifying the initrd.
Then I started hacking on the initrd, making understand how to chroot
to "r0". I ended up with two patches - one to util-linux, and one to
@ -48,6 +57,8 @@ $ ./autogen.sh; ./configure ; make
Now you have a modified "sys-utils/switch_root" binary. Let's next
patch the initrd and rebuild it:
$ cd ..
Make a backup:
$ mkdir initrd
@ -63,6 +74,10 @@ Repack:
$ (cd initrd; find | cpio -o -H newc) | gzip > /mnt/debian/boot/initrd.img-3.0.0-1-amd64.new
$ mv /mnt/debian/boot/initrd.img-3.0.0-1-amd64{.new,}
Unmount:
$ umount /mnt/debian
Running hacktree inside the system
----------------------------------