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If you need to remove some package from your Debian based system you can do that by this

dpkg --force-depends --purge package_name

and install it back by

apt-get install package_name

*package_name is your package

Playing with postfix check_headers directive

Application: Postfix
Version: 2.9
System: Debian
Description:
Use check_headers to replace some headers from emails send by postfix

Using Maildir format in Debian 7:

• mail notification after login
• mail notification after ssh login
• read mail using mailx or mail command

BTW: set delivery agents to use Maildir before

U can see some usefull things below.

XCP:

• VNC console cs_CZ keymap = use en layout(gnome) while connection to DOM0 console(via tunnel like ssh -CN -L 5900(localport):localhost:5901 $HOST)
• no LVM in storage type = create symlink from LVHDSR.py to LVHDSR in /usr/lib/xcp/sm/
• HVC console = /etc/default/grub (CMDLINE_LINUX="console=hvc0") /etc/inittab (co:2345:respawn:/sbin/getty hvc0 9600 linux)

Network bonding on debian:

mode used: balance roundrobin
NICs: 2x 100Mbit
application: ifenslave-2.6 (Debian Wheezy repos)
configs: /etc/network/interfaces
kernel: 3.2 (deb official)

sometimes is need to put "alias bond0 bonding \
options miimon=100 downdelay=200 updelay=200"
to /etc/modules|modprobe.d/

How to backup drive and examine mdadm over the image file using loop

How to check your WPA passphrase security.

Progs needed:
extundelete (check repository or http://extundelete.sourceforge.net/)

#change dir to place where can u write/read with enought space
cd /YOUR_FOLDER_W_RW_RIGHTS

#remount(umount/mount) disk with files w8ing for restore with read only att

umount /dev/xxx

mount -o ro /dev/xxx /media/yyy

#see which inode belongs to you desired folder(with deleted files)
ls -il /zzz

#do the job
extundelete /dev/xxx --restore-inode aaaa

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Nazev: Port forwarding at the FW
Co: SSH, iptables