Archive for October, 2005
Copy on write memory for Xen
by paul on Oct.03, 2005, under Computing
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It looks like the Xen Virtual Machine Monitor is going to get a copy on write memory sub-system sometime soon, removing one of the few remaining performance limitations on the platform. Thanks to the work of researchers at UCSD which will be presented in a paper at this years ACM Symposium on Operating Systems Principles, a copy-on-write memory sub-system has been developed for the Potemkin Virtual Honeyfarm. Whilst the existing implementation is specific to the honeyfarm, future versions should be able to provide a more general solution much like the similar VMware resource management capability. Having the ability to ‘flash clone’ a virtual machine potentially enables some radically new uses for virtual machines above and beyond the honeypot, particularly when combined with a copy on write filesystem like Parallax, such as the ability to “time-travel” by rolling back the state of a virtual machine to that prior to a failure or exploit. |
Jabberd 2
by paul on Oct.03, 2005, under Computing
I am a big fan of instant messaging, and of XMPP in particular as an open standard. So much so that I run our own Jabberd2 server at work, and we have done a bunch of work on using XMPP services as the basis for wide-scale system management and eventing systems. Having said that, I have always found the open source servers to be a little fragile.
My latest issue was to get into work this morning to find that a routine bug fix for the mysql libraries had broken my jabber installation. Even worse, a quick Google search could only find advice on how to fix the problem using configuration options which had changed, or showed that I was not alone in having this issue
So here it is, for those of you running Jabberd2 on Fedora Core 4 (FC4), you need to make sure that you have mysql-devel installed, and then:
./configure --with-extra-include-path=/usr/include/mysql --with-extra-library-path=/usr/lib/mysql make make install
Photo Rally
by paul on Oct.01, 2005, under Photography
Portland Community College have organised a photo rally (a treasure hunt really) at their Sylvania campus. I decided to take up the challenge today, and here are the results.





