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Inqa.be offers consultancy services for distributed software development, machine learning, machine translation and e-commerce supporting data mining. We turn academic knowledge into everyday problem solving.

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Latest knowledge base articles

02/07/2013 - 13:08
Jenkins authenticity of host can't be established

There is a maven issue which prevents the deployment of a maven site with Ubuntu LTS 12. By default ECDSA keys are stored in the known_hosts file. When scp'ing files from the jenkins account, using wagon-ssh, the build hangs with "The authenticity of host <hostname> can't be established."

03/20/2012 - 16:03
Nexus behind proxy

To run Nexus behind a proxy, you first need to set its context path correctly. If you want, for example an address like http://nexus.starscream.inqa.be, you need to make sure that /nexus is changed into / You can do this in the $NEXUS_HOME/conf/nexus.properties file, as described in

http://www.sonatype.com/books/nexus-book/reference/install-sect-proxy.html

 

01/20/2012 - 16:28
Using the Host-only DNS server without causing an infinite loop: activating BIND on your host OS (X)

In order to access the FQDN's on your VirtualBox host-only network, you need your host OS to access the DNS server on the host-only network. Adding it as the primary dns server in your host OS may seem to do the trick (you can access all the cluster nodes with their FQDN), but when you issue a DNS lookup from a cluster node to the outside world, things go terribly wrong.

This is logical, as you are creating an infinite loop:

01/19/2012 - 16:38
SMTP module makes all mails sent with the contact form module originating from the site's address

When using an external SMTP server, e-mail generated with the contact form no longer shows the sender's address. You can only retrieve it by looking at the logs. This is definitely not what you want to do, so the following patch includes the sender's e-mail in the message body:

http://drupal.org/node/230105

01/19/2012 - 15:28
Creating a virtual hadoop cluster with VirtualBox, PfSense, Cloudera Manager and CentOS 6

Setting up a virtual Hadoop cluster can soon become a deployment and maintenance nightmare. Especially when it comes to network configuration, Hadoop seems to be very picky. To cope with this problem, we will describe in this article how concerns (network and actual processing) can be divided in a simple manner. We will use a separate guest OS for network configuration, attach it to the host OS via bridged networking, and run the Hadoop cluster on an internal VirtualBox network.

01/19/2012 - 14:19
VirtualBox bridged mode failure on OS X

When using VirtualBox VMs in bridged mode on Mac OS X, you may encounter network problems: at a random moment in time, guest OS'es may cease to connect to the physical network your host system is connected to.

As described in the following thread, the issue can be resolved by switching on ip forwarding in Mac OS X:

https://forums.virtualbox.org/viewtopic.php?f=8&t=37881

You can do this by issueing the following command from the shell: