VMware Workstation: Generate a new selfsigned SSL/TLS certificate


the VMware Workstation does not provide a program or script to generate a new pair of key and selfsigned certificate.

If’ve written a batch file which builds a new one. The scripts assumes that the Workstation is installed in the default folder C:\Program Files (x86)\VMware\VMware Workstation and uses the openssl command delivered with the program.

Adjust the Countryname, State, etc. to your own needs. Config is based on the VMware Docs.

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Debian: Setup owncloud with TLS (LetsEncrypt) and protected by AppArmor


this Tuturial describes the steps to setup owncloud on top of debian/raspian with lighttpd as webserver and https encryption with certificates sign by Let’s encrypt campain.

Operating System

Install a minimal debian jessie system.

Login as root. On raspbian login as user pi change to root.
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Virtualbox: Creating and controlling Virtual Maschines from command line


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

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Script to get a list of computers connected to a Avocent KVM switch


in his office, a customer have a few Avocent KVM switches to control some client computers in a remote room. He ask me about the possibility to get a list of all computers connected to these boxes, because he do not want to maintain any list by hand.

I research the documention but there is no (scripting) interface from which I could get such a list. SSH is only for connecting serial consoles, SNMP offers no OIDs for such a case.

Because of the costs, DSView isn’t a option. The only way seems to be to extracting the list by reading the Webfrontend HTML output. Let us do this 🙂

I wrote a script in powershell, at least version 2 is needed to handle selfsigned SSL certificates, which do the following:

  • Login to the Webfronted with https and SSL encryption by System.Net.HTTPWebRequest class to get the authentification cookie
  • Get the Device HTML  page by .NET class System.Net.Webclient and using Authentification cookie
  • Save HTML do a temporary file
  • Open the file with Internet Explorer
  • Get the URL to start a KVM session, computername and portnumber by  DOM

Script details

Define the User, Password, protocol and the devices:

# KVM User
# KVM Password
# Protocol
# Your Devices

Built HTTP POST text and disable SSL certificate warnings
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