script to rescue/backup a system and restore from a cd with initramfs 
Searching for a rescue system that creates a bootable CD to restore my system i found mkcdrec. Because sometimes things (mkcdrec/debian/ubuntu) changes and i had to test and patch for new mkcdrec versions, so i droped it.

Then i started to make a live CD with debian-live and make my install script by myself. I also dropped it (long boottime and had too much to hack to let it work like i wanted).

Now i had the idea to build my own script that tar's my system and builds a bootable cd. I liked the idea of initramfs to extend it like i will and it boots much faster. The only drawback is that all things are hardcoded and have to be changed for every system i backup. But its only a single script: Read More...

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qemu 
#> sudo apt-get install kqemu-source kqemu-common build-essential
#> sudo module-assistant prepare kqemu
#> sudo module-assistant auto-install kqemu

/etc/udev/rules.d/60-kqemu.rules:
KERNEL=="kqemu", NAME="%k", MODE="0660", GROUP="kqemu"

#> sudo addgroup --system kqemu
#> sudo adduser USERNAME kqemu
#> modprobe kqemu

create a qemu image:
#> qemu-img create -f qcow2 root.qcow2 20G

install with a cd:
#> qemu -hda root.qcow2 -cdrom cd.iso -boot d

boot installed system:
#> qemu -hda root.qcow2


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Grub Error 2: Bad file or directory type 
grub prior 0.97 only supports a inode size of 128 Bytes

To format a partition set inode size of 128 Bytes:

#> mkfs.ext3 -I 128 /dev/sda6

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Two usb video capture stick with em28xx driver 
get http://mcentral.de/hg/~mrec/em28xx-new/ ... tip.tar.gz and untar
cd em28xx-new-*
make
find /lib/modules/$(uname -r) -name "em28xx*" -type f | xargs rm -rf
find /lib/modules/$(uname -r) -name "tvp5150.ko" -type f | \
xargs rm -rf
mkdir -p /lib/modules/$(uname -r)/empia
cp *.ko /lib/modules/$(uname -r)/empia
cp tvp5150/tvp5150*.ko *.ko /lib/modules/$(uname -r)/empia
strip -d /lib/modules/$(uname -r)/empia/*.ko
depmod -a

/etc/modprobe.d/local
options em28xx card=14 vbi_mode=0 alt=4
options em28xx card=43 vbi_mode=0 alt=2
These two options lines are really working

With alt i use a lower bandwidth for usb

For Kernel >= 2.6.27 card indexes changed, no alt setting is needed and only one option line in /etc/modprobe.d/local is working:

options em28xx card=9,38

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io scheduler for databases (deadline) 
As suggested by http://www.nextre.it/oracledocs/oraclemyths.html
i put elevator=deadline to grubs menu.lst.

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