Yesterday (25th of April) www.lonelycoder.com had an outage rendering the website inaccessible for almost 24 hours.
I think the root cause of the problem was a bug in Phusion Passenger (the glue between Apache and the Ruby on Rails app) causing all worker processes to set themselves as immune to the OOM killer. This is obviously very bad as it causes the Linux kernel to kill all other (much more important) processes first in case of a low memory condition.
I've upgraded Passenger to a new version where this bug is fixed. Also our fellow hosting provider has doubled the amount of RAM available to the server so a similar outage should hopefully not happen again.