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VMbuilder Ubuntu bug and simple workaround for failed umount of temporary devfs

Posted by on May 18, 2012 in HOWTO | 0 comments

While attempting to build virtual machines on Ubuntu 12.04 using the vmbuilder tool (package: python-vm-builder), and (IIRC) on a few other versions of Ubuntu (I think 11.10 and/or 11.04), I kept having vmbuilder crash on me with an unhandled exception (an VMBuilder.exception.VMBuilderException exception, to be specific). The error read “umount of temporary devfs failed” and would be seen at the very end of the VM building process when trying to unmount some of the temporary installation directories. A Workaround that Works I...

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One-time Passwords on Linux or Unix using PAM

Posted by on Jan 3, 2012 in HOWTO | 0 comments

One-time passwords (OTPs) are a means of accomplishing two-factor authentication (TFA/T-FA/2FA), an authentication approach aiming to increase account security over traditional passwords. Now, you can easily set up one-time passwords (passcodes) and two-factor authentication in Linux (and Unix and anything else that makes use of PAM)!

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Secure WordPress login without HTTPS

Posted by on Dec 5, 2011 in HOWTO | 0 comments

Do you access a WordPress installation on a web server without HTTPS? If so, your passwords are sent in plaintext every time you login, register for accounts, add new users through the admin interface, and change user passwords. Fortunately, there is a VERY SIMPLE solution to (at least slightly) improve the security of sending passwords over HTTP. This HOWTO will show you how.

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HOWTO Install XCP in KVM (nested hypervisor)

Posted by on Dec 3, 2011 in HOWTO | 1 comment

HOWTO Install XCP in KVM (nested hypervisor)

There might come a time when one wants to test Xen Cloud Platform (XCP) or XenServer without needing to wipe an entire physical machine. Fortunately, XCP can easily be installed within a virtual machine! This HOWTO will show you how.

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Announcements: Buy Our Book, “Running Xen”

Posted by on Apr 9, 2008 in Uncategorized | 0 comments

Announcements: Buy Our Book, “Running Xen”

"Running Xen: A Hands-On Guide to the Art of Virtualization" [runningxen.com] [Buy Now]

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