If you want to manipulate DNS-Entries before and without ISP-DNS Resolution you can do it with extra DNS-Server at your site. Best thing would be putting this DNS in DMZ-Zone.

e.g. Youre hosting WebEx and have one Public-URL to connect. Your Internal Clients will always route the traffic via Internet. To avoid this you can override the DNS – Resolving at your ISP with an own DNS. It’s also possible with your own Windows-DNS but… I like Linux 😉

Here I did with Linux, because its free:

Install BIND and configure named.conf

// named.conf
// Provided by Red Hat bind package to configure the ISC BIND named(8) DNS
// server as a caching only nameserver (as a localhost DNS resolver only).
// See /usr/share/doc/bind*/sample/ for example named configuration files.
options {
        listen-on port 53 {;; };
        listen-on-v6 port 53 { ::1; };
        directory       "/var/named";
        dump-file       "/var/named/data/cache_dump.db";
        statistics-file "/var/named/data/named_stats.txt";
        memstatistics-file "/var/named/data/named_mem_stats.txt";
        allow-query     { localhost;;; };
        recursion yes;
        //dnssec-enable yes;
        //dnssec-validation yes;
        //dnssec-lookaside auto;
        /* Path to ISC DLV key */
        //bindkeys-file "/etc/named.iscdlv.key";
        //managed-keys-directory "/var/named/dynamic";
        forwarders {;; };
logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
//zone "." IN {
//      type hint;
//      file "named.ca";
include "/etc/named.rfc1912.zones";

Important parts of config:

Who is allowed to query this DNS?

 allow-query { localhost;;; };

Forward-Adresses for DNS-Requests which cannot be handled/resolved by the local DNS

forwarders {;; };

For your linking your own zones:

include "/etc/named.rfc1912.zones";

If you do changes, dont forget to restart

/etc/init.d/named restart
If you now want to override some URLS you have to create a link inside of /etc/named.rfc1912.zones
zone "override.untony.org" IN {
type master;
file "named.override.untony.org";
allow-update { none; };

and of course a file in /var/named called named.override.untony.org (in our example)

$TTL 86400 @       IN SOA  @       root (                                         2013111501      ; serial                                         1D              ; refresh                                         1H              ; retry                                         1W              ; expire                                         3H )            ; minimum @        IN NS          localhost. @        IN A 

When you now put this DNS Server in your Active-Directory DNS as a forwarder every Request which goes to override.untony.org will be resolved with which us a total different site.

How-To change Forwarder in Active Directory-DNS:
in DNS Console right click the DNS and choose Properties.
Then navigate to forwarders tab and enter the IP-Adress of the new DNS, usually you have there your ISP-DNS or Google DNS servers.

In short:

#/etc/apt/sources.list editing
echo -e "\n# Clonezilla" >> /etc/apt/sources.list

echo "deb http://drbl.sourceforge.net/drbl-core drbl stable" >> /etc/apt/sources.list

# Add GPG-Key
wget http://drbl.sourceforge.net/GPG-KEY-DRBL
apt-key add GPG-KEY-DRBL

#Update Packagelist
apt-get update

#drbl installation
apt-get install -y drbl

#Set up Clonezilla und drbl
drblsrv -i
drblpush -i

Inside of your DHCP you have to reconfigure:

For the neccessary scope.

Option 66 with IP Adress of cloning server

Option 67 with  pxelinux.0

Long(er) Explanation here:

OS Installation

Install an Ubuntu or Debian Server first. Then start with Clonezilla SE Installation. Commands have to be executed by root

sudo -i

Add this Line in your /etc/apt/sources.list

deb http://drbl.sourceforge.net/drbl-core drbl stable

then import the GPG-Key

wget http://drbl.sourceforge.net/GPG-KEY-DRBL
apt-key add GPG-KEY-DRBL

To renew sources do:

 apt-get update

and install dbrl

apt-get install drbl

This should also install every dependencies

Set up Clonezilla

First start with configuring dbrl

drblsrv -i
  1. Install Network Boot-Images: If you want to boot from Images, not for installing so i chose „N“
  2. Serial Output: I chose „N“
  3. Operating System update: I chose „N“
  4. Kernel for Client: I chose 1

Next step is:

drblpush -i
  1. DNS-Domain: choose your local domain
  2. NIS/YP Domain-Name: not neccessary
  3. Präfix for Clienthostname: as you wish eg. clonezilla
  4. NIC for Internetaccess: mostly eth0
  5. Collecting MAC-Adresses: You can choose N
  6. Ip-Adress to MAC: Clients do always get the same IPs (like reservations)
  7. Start of IP-Adress-Range: eg. 1, First IP is then 192.169.0. 1
  8. Max Clients: eg. 20, last IP would be 192.169.0. 20
  9. Diskless Services: Not needed
  10. Type of usage: For our scope 1 is enough
  11. Where to put the images?
  12. You can choose a password for accessing Clonezilla
  13. Bootprompt for Clients: N




  • Create a share on a server
  • Install cifs-utils: apt-get install cifs-utils
  • Create a folder under /mnt for mounting:
    mkdir /mnt/backup
  • Inside of /etc/fstab define the mountpoint:
//backupserver/Linux_Backups   /mnt/backup   cifs    credentials=/etc/cifspw    0       0
  • Create /etc/cifspw with credentials für a „mounting-user“

> Ubuntu 12


< Ubuntu 13

  • Try via mount -a if mounting works and verify output of df or simply go to /mnt/backup (cd /mnt/backup)
  • Create a file called mysqlbackup.sh inside of /usr/sbin and add this content:
for db in 'mysqlshow -u $user -p$password | sed -n -e "s/^| \([^ ]*\)[ ]*|$/\1/p"'  
do mysqldump --opt -u $user -p$password $db > /mnt/backup/ /mysql/$db.sqldone

After creation do chmod a+x mysqlbackup.sh so that the script can be executed

  • To automate the job create a cronjob under /etc/cron.d called mysql_backup (or do it via crontab –e)
00 02 * * *     root    /usr/sbin/mysqlbackup.sh >/dev/null 2>&1

You need to open a command prompt window as an administrator, and then the directory you need to remove varies depending on the OS you’re working with:

  • For Windows 7 or Server 2008 run this command from the command prompt:
    • rd /s D:\$Recycle.Bin
  • For Windows XP or Server 2003 run this command from the command prompt:
    • rd /s D:\recycler

Note: These commands reference the “D:\” drive. Each drive keeps its own Recycle Bin so you’ll need to run this for each drive letter that you want to empty.

After running the command you may notice that the Recycle Bin icon may not refresh immediately to reflect that it is empty. This is because you’re using a non-standard procedure to empty the Recycle Bin, but if you open it up the icon will refresh and you should see that there are no files in there.


Just a few commandos to remind:

Command Description
sh run
Show running Config
sh switch
Shows availability of cluster nodes
sh conf
Shows config (which is loaded when booting)
sh mac address-table inter gi 1/0/20
Find out Mac Adress
sh interfaces status
Shows ports stats
sh arp
Address Routing Table (MAC/IP/VLAN/Age)
writes running config
Reset port to default
conf t
default interface gi/1/0/42
Port zurück auf Default
default switchport access vlan
Activate port (shut/noshut)
conf t
interface gi/1/0/42
Choose port
no shutdown
Activate port
Exit conf mode
sh interface status gi/1/0/42
Shows Port info
Config a port basic
conf t
interface gi/1/0/42
Choose Interface
description *****SEPPL*****
Set Description
Exit conf mode
sh run int gi/1/0/42
Shows Port info
Config a port
conf t
interface GigabitEthernet1/0/28
Choose Interface
description AT-KL-PROD-AP07
Set Description
switchport trunk native vlan 200
For trunk set native VLAN
switchport trunk allowed vlan 60,90,200
For trunk set additional VLANs
switchport mode trunk
Set TRUNK active
switchport nonegotiate
For a faster (UP)Link
switchport voice vlan 70
Set vlan 70
logging event trunk-status
Logging for TRUNK
spanning-tree portfast
SPANNING TREE Protocoll portfast
Copy running-config startup-config
Copy running config to startup config (wr?)



VLAN 20 + 70
interface GigabitEthernet1/0/1

description ***20 VLAN***

switchport access vlan 20

switchport mode access

switchport nonegotiate

switchport voice vlan 70

mls qos trust dscp

spanning-tree portfast
interface GigabitEthernet1/0/28

description TRUNKY TRUNKY

switchport trunk native vlan 200

switchport trunk allowed vlan 60,90,200

switchport mode trunk

switchport nonegotiate

switchport voice vlan 70

logging event trunk-status

spanning-tree portfast
ESX – Server
interface GigabitEthernet2/0/23

description ESX-Server

switchport trunk encapsulation dot1q

switchport trunk native vlan 1999

switchport trunk allowed vlan 1,10,12,200

switchport mode trunk

switchport nonegotiate

logging event trunk-status

mls qos trust dscp

spanning-tree portfast trunk

Bildergebnis für ext4

– Expand the virtual disk in Virtualization Software
– Reboot Server for recognizing the new disk size
– delete the partition via fdisk and recreate it with new size
– resize2fs resize filesystem

for example resize sdb disk:
[root@kot ~]# fdisk /dev/sdb
(you can type m for help)

type "p" for showing the partition table, after evaluating the number of the partition type
d (for delete) and enter the partition number
After deleting the old partition type n for creating a new one
p for primary
For first cylinder i chose default setting (1)
For last cylinder I also used default setting
w for write

After that reboot, and after the reboot type resize2fs /dev/sdb(1) so the partition can extend. Check via df, the partition should now have the new size.

Unfortunately a Linux in german:

[root@kot ~]# fdisk /dev/sdb
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Befehl (m für Hilfe): m
Befehl Bedeutung
a (De)Aktivieren des bootfähig-Flags
b \u201ebsd disklabel\u201c bearbeiten
c (De)Aktivieren des DOS Kompatibilitätsflags
d Eine Partition löschen
l Die bekannten Dateisystemtypen anzeigen
m Dieses Menü anzeigen
n Eine neue Partition anlegen
o Eine neue leere DOS Partitionstabelle anlegen
p Die Partitionstabelle anzeigen
q Ende ohne Speichern der Änderungen
s Einen neuen leeren \u201eSun disklabel\u201c anlegen
t Den Dateisystemtyp einer Partition ändern
u Die Einheit für die Anzeige/Eingabe ändern
v Die Partitionstabelle überprüfen
w Die Tabelle auf die Festplatte schreiben und das Programm beenden
x Zusätzliche Funktionen (nur für Experten)
Befehl (m für Hilfe): d
Partition 1 ausgewählt
Befehl (m für Hilfe): n
Befehl Aktion
e Erweiterte
p Primäre Partition (1-4)
Partitionsnummer (1-4): 1
Erster Zylinder (1-104433, Vorgabe: 1):
Benutze den Standardwert 1
Last Zylinder, +Zylinder or +size{K,M,G} (1-104433, Vorgabe: 104433):
Benutze den Standardwert 104433
Befehl (m für Hilfe): p
Platte /dev/sdb: 859.0 GByte, 858993459200 Byte
255 Köpfe, 63 Sektoren/Spur, 104433 Zylinder
Einheiten = Zylinder von 16065 × 512 = 8225280 Bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x604f021e
Gerät boot. Anfang Ende Blöcke Id System
/dev/sdb1 1 104433 838858041 83 Linux
Befehl (m für Hilfe): w
Die Partitionstabelle wurde verändert!
Rufe ioctl() um Partitionstabelle neu einzulesen.
WARNING: Re-reading the partition table failed with error 16: Das Gerät oder die Ressource ist belegt.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Synchronisiere Platten.


[root@kot ~]# resize2fs /dev/sdb1
resize2fs 1.41.12 (17-May-2010)
Das Dateisystem auf /dev/sdb1 ist auf /usr2 eingehängt; Online-Grössenveränderung nötig
old desc_blocks = 26, new_desc_blocks = 50
Führe eine Online-Grössenänderung von /dev/sdb1 auf 209714510 (4k) Blöcke durch.
Das Dateisystem auf /dev/sdb1 ist nun 209714510 Blöcke groß.
[root@kot ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 50G 3,2G 44G 7% /
tmpfs 16G 156K 16G 1% /dev/shm
/dev/sda1 1,5G 33M 1,4G 3% /boot
/dev/sda3 32G 672M 30G 3% /var
/dev/sdb1 788G 30G 718G 4% /usr