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1. Introduction
2. Getting it
3. How to use it
4. About
1.1. What is it?
This is a rescue CD based on Debian GNU/Linux with:
- LVM2 support
- RAID support
- dm-crypt support
More in detail, it is a modified version of Timo's rescue CD version 0.9.12r2 (see http://rescuecd.sourceforge.net/).
It does not have any useless Xwindow, but only what is strictly necessary to restore a broken system.
1.2. Why this CD?
Some time ago, I realized a server with the OS on LVM2 on RAID1 (see http://emidio.planamente.ch/pages/linux_howto_root_lvm_raid.php).
Due its particular configuration, if the server does not boot anymore, there is not a simple and fast way to restore it.
The most rescue CDs or live CDs does not have all what I needed. Furthermore, I was not interessted in an Xwindow, because it only needs more time to bring up the live CD.
After long researchs, I have found the Timo's rescue CD. It is a great tool for creating a rescue CD by your self. It is also possible, in a very easy way, to add/remove packages, upgrade the system and install your own kernel.
I have given it a try and ... here the result.
2.1. Downloading ISO image
Due the size of the ISO image (~250MB), consider first to create an ISO image your self, following the instructions on the next chapter.
If you want to download the already build ISO image, here the link:
http://emidio.planamente.ch/docs/linux/rescuecd/emirescuecd.iso.tar.bz2
Logically, call
tar xjf emirescuecd.iso.tar.bz2
to extract it.
2.2. Creating it your self
You can easily create an ISO image of the Emi's rescue CD starting with the sources of the Timo's rescue CD.
Download the official Timo's sources:
http://prdownloads.sourceforge.net/rescuecd/timos_rescue_cd_set-0.9.12r2.tar.bz2.
Download my script and my 2.6.12 kernel:
http://emidio.planamente.ch/docs/linux/rescuecd/emirescuecd-tools.tar.gz
Ensure you to have all in the same directory, extract the tools
tar xzf emirescuecd-tools.tar.gz
and call as root:
./timo2emi
Then, just follow the instructions.
3.1. Burning CD
Burn the ISO image
emirescue.iso
on a CD by calling
cdrecord -v dev=0,2,0 speed=10 gracetime=2 driveropts=burnfree -data emirescue.iso
or use your favorite tool.
3.2. Booting
Just boot the CD and select menu 1.
3.3. Logging in
Use the following account:
user: root
password: rescue
3.4. Selecting keyboard
Select the desired keyboard by calling:
kbdmap
3.5. Mounting SYSFS
If a sysfs is not mounted, LVM will crash with a segmentation fault instead of giving an intelligent error.
Therefore, call
mkdir /mnt/sys
mount -t sysfs none /sys
3.6. Starting RAID
Load required modules:
modprobe md raid1
Copy configuration file:
cp mdadm.conf /etc/mdadm/mdadm.conf
Start RAID:
/etc/init.d/mdadm start
Verify if really started:
cat /proc/mdstat
3.7. Decrypting crypted device
This was not scheduled for my Debian system, but it could anyway be useful.
Just call
cryptsetup create crypted /dev/hdax
replacing /dev/hdax with your partition.
3.8. Activating LVM partitions
Just call
vgscan
vgchange -a y
4.1. Author
Emidio Planamente <eplanamente@gmx.ch>
4.2. Feedback
Please let me know if you have found this CD helpful.
Any other feedback is also welcome.
4.3. History
Version 1
First public release
Version 1.1
Added "How to use it"
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