A set of command line tools is available for the Joyent cloud computing platform which allows you to e.g. list images and create virtual machines. The installation of this set is a bit tricky on CentOS as it requires node.js and this package is not available with yum. So we start with the installation of […]
Installing Rackspace command line tools on CentOS
A set of command line tools is available for the Rackspace cloud computing platform which allows you to e.g. list images and create virtual machines. The installation of this set can be achieved with the following commands: yum install python-setuptools easy_install pip pip install rackspace-novaclient The information that the nova client needs is obtained from […]
Installing Azure command line tools on CentOS
A set of command line tools is available for the Windows Azure platform which allows you to e.g. list images and create virtual machines. The installation of this set is a bit tricky on CentOS as it requires node.js and this package is not available with yum. So we start with the installation of node.js: […]
Android mobile network settings for Vodafone business in the Netherlands
The following settings are needed for using the Vodafone business mobile network in the Netherlands with an Android phone: Name Choose one yourself, e.g. Vodafone Business Android APN office.vodafone.nl Proxy not set Port not set Username vodafone Password vodafone Server not set MMSC http://mmsc.mms.vodafone.nl MMS proxy 192.168.251.150 MMS port 8799 MCC 204 MNC 04 Authentication […]
Installing Apache Libcloud on CentOS
Apache Libcloud is a standard Python library that abstracts away differences among multiple cloud provider APIs. At the moment it can be used to manage four different kinds of cloud services: servers, storage, loadbalancers and DNS. Here are the steps to install Libcloud on a machine running CentOS 6: rpm -Uvh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm yum install python-pip […]
Increasing CentOS LVM disk size on XenServer
The disk size of a CentOS virtual machine on XenServer can be increased with the following steps. The current VM contains one disk of 8 GB which is divided into a boot partition and an LVM partition: # fdisk -l Device Boot Start End Blocks Id System /dev/xvda1 * 1 64 512000 83 Linux /dev/xvda2 […]
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Creating a Java WebStart (JNLP) application
Java WebStart, also called Java Network Launching Protocol (JNLP), allows you to launch Java applications directly from the internet using a webbrowser. In this article we will create a simple application and all configuration files necessary to launch it through Java WebStart. We start with a simple Java program with a GUI: package nl.jansipke.samplegui; import […]
Using the pipe backend in PowerDNS
PowerDNS is a Domain Name System (DNS) server with a lot of different possible backends, such as MySQL, PostgreSQL, LDAP, BIND zone files and a Unix pipe backend. In this article we will look at the pipe backend which is passed the DNS request by PowerDNS through standard input (stdin) and must reply through standard […]
Creating network diagrams with D3.js
D3.js is a JavaScript library for manipulating documents based on data. It can be used for all sorts of visualizations including network diagrams. In this article we will create a network diagram with nodes and directed links between them, visualized by circles and lines with arrowheads. We start with the file index.html that holds the […]