postfix with no local delivery 
Thursday, September 11, 2008, 13:50 - Mail
Posted by Administrator
All mails for local accounts should be transfered to a central mailserver.

Sender email should look like USER@HOST.DOMAIN and all mails should be delivered to root@DOMAIN.

Usually /etc/aliases is used, but in my case local delivery is disasbled.

/etc/postfix/main.cf:
myhostname = HOST.DOMAIN
myorigin = $myhostname
relayhost = $mydomain
mydestination =
local_recipient_maps =
inet_interfaces = 127.0.0.1
local_transport = error:local delivery is disabled
recipient_canonical_maps = hash:/etc/postfix/recipient_canonical

/etc/postfix/recipient_canonical:
@HOST.DOMAIN root@DOMAIN


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script to rescue/backup a system and restore from a cd with initramfs 
Friday, September 5, 2008, 13:35 - System
Posted by Administrator
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 
Friday, September 5, 2008, 12:46 - System
Posted by Administrator
#> 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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fast sftp 
Friday, September 5, 2008, 12:15 - Network, Security
Posted by Administrator
sftp -o Ciphers=blowfish-cbc USER@HOST

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Grub Error 2: Bad file or directory type 
Tuesday, August 19, 2008, 15:58 - System
Posted by Administrator
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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