Undrblog

This write-up is incomplete, but it has some useful information about my first attempt at ganeti.  I’ll be attempting this install on another set of machines in the near future, and i’ll post another blog entry. I’m a system administrtor, I started out as a hacker, a tinkerer, and a curious sort.  No, I’ve never…

I was doing some thinking this morning while on my hour long commute. Thinking about old times, and old friends. High school, when I was in high school, I went to a technical school, we had this project. A hand full of us were picked to physically wire the school for cat5. It wasn’t a…

I’m just reading about this now, but apparently Yesterday, 4/22/2011, morning a network event took severely hindered Amazon’s EC2 cloud.  According to an article I found on Internetnews.com Amazon is blaming the outage on storage issues caused by a network event. A report form amazon said: A networking event early this morning triggered a large…

VDI, or Virtual Desktop Infrastructure is one of those new IT buzzwords.  VMWare does it, Citrix Xen Does it, a few others do it.  RedHat does it (or, is in the process of doing it) as well. A friend of mine has been looking into VDI for a client, and it got me curious.  I…

This is a simple one, but I’ve not used it much before today. You can use lsof on a linux box to find out what’s connected to what over the network. In this case, we’d implemented a new ldap server, and it’s address had changed, I was attempting to determine what was still connecting to…

I have an HTC Incredible, bought it a few months ago, and shortly thereafter rooted it. I used the Unrevoked one-click root tool.  Just plug in your HTC droid via USB, set it to Sync mode, and fire up the app.  It’ll install ClockworkMod Recovery, and sets S-OFF, and enables superuser access.  You can then…

So I’m working on regisgtering 100+ RHEL systems to a new RHN Satellite server.  The following command line for loop magic mad this a snap, thought it was worth publishing. First, I’m using a passworded SSH key.  So you’ll want to use ssh-add (with ssh-agent) to store your credentials, otherwise it’ll be a pain to…

“The Cloud” or “Cloud Computing” are some of the latest buzz words in the industry.  The definition of either of these terms is… well.. cloudy.  The basic idea is that your applications are virtualized across a global network of hypervisors.  Not too dis-similar from the VM Clusters run at the institution that I work at,…

I run a Xen vm system which in turn hosts all of my linux servers. Recently, I had reason to mount the disk image from one of the vm’s on the xen host. I’ve found little documentation on this, so I thought i’d post what I ended up doing. First, make sure the vm is…

We’ve started to look into memory ballooning on RHEL and KVM.  I thought I’d document some of my findings here. The concept is simple.  You have your RHEL host, running KVM, that host runs a number of virtual machine guests.  The guests can be anything that runs on the chip archetecture that you’re emulating.  In…