LinuxQuestions.org - Notes on Linux

I leave notes here that I find particularly worth remembering myself.

Howto install selected Debian packages from other releases (apt-pinning)

Posted 11-11-2011 at 08:44 AM by bittner (Notes on Linux)

Mixing releases can be necessary when you need a more up-to-date version of a software in a system running on package management and not (yet) providing later package versions.

For example, we need the latest git on your Debian Lenny system, because you updated your Eclipse plugins, and now the git integration refuses to work with your old client. Shoot! Let's check what to do to fix this...

Things to do

Edit /etc/apt/sources.list (or create/edit a file in /etc/apt/sources.list.d/

...

bittner

LQ Newbie

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USB stick with Ubuntu Live system doesn't boot - why?

Posted 01-19-2011 at 05:17 AM by bittner (Notes on Linux)
Updated 01-19-2011 at 05:39 AM by bittner

Tags boot, live usb, ubuntu, usb memory sticks

Creating an installation stick with Ubuntu seems to be a piece of a cake nowadays. Ubuntu does provide a tool, the "Startup Disk Creator" (System > Administration > Startup Disk Creator) which frees novice Linux users from knowing operating system level details. At least it seems.

I regularly notice, either in my Linux courses or in discussions with other proficient Linux users, that the tool on Ubuntu typically doesn't make sticks boot out-of-the-box. Usually, this...

bittner

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Remove unwanted locales on Ubuntu / Debian

Posted 10-31-2010 at 05:18 AM by bittner (Notes on Linux)
Updated 11-01-2010 at 10:43 AM by bittner

Tags debian, locale

Sometimes you feel bothered by too many locales (pre)installed on your Debian system. If I run a server I typically want basic stuff on it, so for locales "en_US-UTF8" is enough.

Which locales are installed on my machine?
You can check which locales are generated and configured on your system using the locale command:

locale ... list the current locale configuration
locale -a ... lists all all locales that were generated on your system
locale -a -v ... list

...

bittner

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CIDR to Netmask conversion with Python (convert short netmask to long, dotted format)

Posted 09-03-2010 at 06:43 AM by bittner (Notes on Linux)
Updated 09-03-2010 at 11:20 AM by bittner

Tags linux, networking, python

When you write scripts dealing with setting up or analyzing network interfaces you will eventually run into the task of converting a netmask from one format into another.

Typically, the setup of an ethernet TCP/IP network interface consists of an IP address, a netmask, and a broadcast address. Unfortunately for you as a novice, the two tools ifconfig and ip show the same (or similar) information in a different format.

Quote:

$ /sbin/ifconfig
eth0 Link

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bittner

LQ Newbie

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Multipath on Debian Lenny and Intel Modular Server (MFSYS25)

Posted 08-16-2010 at 03:56 AM by bittner (Notes on Linux)
Updated 09-13-2010 at 05:33 AM by bittner (added link to FAI discussion)

Tags debian, multipath-tools

The Intel Modular Server is a complete server system designed to simplify a complex fail-safe IT environment. One characteristic is that it provides virtual disks and two storage controllers for redundancy. Systems that use those virtual disks have two physical paths to access their disk(s). (NOTE: This is not a RAID solution against disk defects, but safeguards against a breakdown of a storage controller!)

When you install and boot Linux on such a machine you will see both paths...

bittner

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