All posts by Michael Albert

VirtualBox

Virtualbox: Creating and controlling Virtual Maschines from command line

Leave a comment

Hi,

VirtualBox offers a very powerful command inferface: vboxmanage. With vboxmanage you can create new virtual machine, add and modify harddisk and much more. All the things you could do in the GUI, and a lot more are also possible at command line. In this post I will create, modify, control and delete a complete virtual machine.

At the bottom of the post the whole script can be downloaded.
I used a debian linux system for my tests. To install the latest VirtualBox version use the following commands:

echo "deb http://download.virtualbox.org/virtualbox/debian wheezy contrib non-free" >> /etc/apt/sources.list
# Add Oracle Keyring
wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | apt-key add -
# Update repositories
apt-get update
# Install latest virtualbox version
apt-get -y install virtualbox-4.3
# Installing the Extentionpack for USB2 and RDP support
wget http://download.virtualbox.org/virtualbox/4.3.6/Oracle_VM_VirtualBox_Extension_Pack-4.3.6-91406.vbox-extpack
VBoxManage extpack install Oracle_VM_VirtualBox_Extension_Pack-4.3.6-91406.vbox-extpack

Continue reading Virtualbox: Creating and controlling Virtual Maschines from command line →

Advertisment to support michlstechblog.info

miscellaneous

Subversion: Check out a project over http proxy server

Leave a comment

Hi,

short post today. It is possible to anonymously checkout the latest version of a project over a http and a http proxy server. The only requierment is that the SVN respository must be available via http.

To define a proxy server open /etc/subversion/servers, locate the [global] section and add/edit the following properties:
Continue reading Subversion: Check out a project over http proxy server →

VirtualBox

VirtualBox: Changing the UUID of a VDI virtual disk File

1 Comment

Hi,

sometimes you simply want to copy a vdi file and attach it to another virtual machine.

This will fail because in a VirtualBox Installation each vdi Harddisk must have an unique UUID. This command line changes the UUID of a VDI file.
Continue reading VirtualBox: Changing the UUID of a VDI virtual disk File →

Linux

Linux: Kerberos authentification against Windows Active Directory

8 Comments

Hi,

here are some steps to use kerberos authentification against a active directory with OS Version Windows Server 2008 R2 or later on your linux machine.

The default krb5 configuration implementation of the most linux distributions did not work out of the box. I assume that the REALM in /etc/krb5.conf is already configured.

Typical error messages are:

kinit: KDC has no support for encryption type while getting initial credentials
kinit: KDC reply did not match expectations while getting initial credentials

michael@debdev:~# kinit  michael@subdomain.domain.local
Password for michael@subdomain.domain.local:
kinit: KDC has no support for encryption type while getting initial credentials

To eliminate the “KDC has no support for encryption type while getting initial credentials” issue change the default encryption type in the libdefaults section of the /etc/krb5.conf file.
Continue reading Linux: Kerberos authentification against Windows Active Directory →

Windows, Windows knowhow

Windows: NTFS symbolic links and hard links

Leave a comment

Hi,

today I will explain the possiblity of the ntfs filesystem to create symbolic- and hardlinks.

Whats the difference? A symbolic link (File) or junction point (Directory) is a pointer to an existing file or directory. These works across volumes.
A hardlink is a file or directory which is referenced by more then one path on the same volume.

An example. The explorer.exe in c:\windows. The most Windows system files are hardlinks. These files have two of them. One in the Windows, respective system32 folder and one to its current version in the component store winsxs.

[C:\]fsutil hardlink list c:\Windows\explorer.exe
\Windows\explorer.exe
\Windows\winsxs\amd64_microsoft-windows-explorer_31bf3856ad364e35_6.1.7601.17567_none_afa79dc39081d0ba\explorer.exe

this means the file is stored once and there are two references in the filesystem to it.
With the dir command you cannot identify an hardlink. The only way is fsutil.exe.

Creating an hardlink is very easy. Continue reading Windows: NTFS symbolic links and hard links →