I'm just not a fan of barriers...

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 huge building, 5 of us were picked. Once the cable was laid, we brought on 5 more students, and we built or upgraded 170 pc's.

lsof, and network connections.

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 the old ldap server on a given linux system.

Netstat showed:

HTC Incredible, Root, and Custom Roms

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 install root apps, like wireles tethering, Titanium backup, and a number of other things.  One great thing that Clockwork gives you, is the ability to run NAND backups of your current running ROM, and the ability to install other ROMS.  Which is perfect!

To The Cloud! Maybe not the best solution.

"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, just on a much larger scale.

Mounting xen disk images.

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 down. Then you can mount it's disk image.

I used kpartx to mount the image as a loop.

RHEL 5.5 KVM Guest memory ballooning

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 my case, x86_64 and i386.  We run some Windows guests, and mostly RHEL.  In my testing, i'm using a RHEL guest.  I'll test this on Windows at some point, and see what happens. 

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