You can reach me by email at my idea of a spam-proof address here:

echo "jp.is.king" | perl -ne "s/\./@/g; print" |
   perl -ne "s/is\@king/javaclass/g; print" | perl -ne "s/$/.co.uk/; print"

If you got here by mistake, and are instead interested in the Computational Life Sciences research group at the University of Malta click here.

Below find some common tasks I keep returning to or are of general interest (or scarce on the www).

• How do I install cassandra?
• How do I fix Cassandra after an Ubuntu upgrade?

• How do I change the MOTD banner?
• How do I run tasks in parallel using GNU parallel (e.g. compress files of a certain kind)?
• How do I split a file based on the first column (e.g. of a csv file)?
• How do I insert the same header in all files?

• How do I install Molgenis on Ubuntu ?

This is perhaps the most annoying piece of software I have ever managed. Questions on the mailing list either go unanswered or else are replied with “it is easier to just reinstall your cluster”. I mean, seriously guys. I am writing these notes down as I am sure I will need to refer to them later.

• How do I reinstall a compute node from scratch?
• How do I add an interface (e.g. public) to a compute node?
• How do I add a user to the Rocks cluster?
• How do I distribute a file across all the nodes in the cluster?
• How do I change Rocks cluster private domain name?
• How do I install an RPM across all compute nodes (on kickstart)?
• How do I create an RPM package from an existing directory (how to package a program)?