Archive for the ‘Unix’ Category

Mailman subscriber lists

Unix | Posted by cbbrowne
Feb 27 2013

As part of “due diligence” for some mailing lists I am involved with (for Slony, see slony-backups ), I discovered the need to dump out Mailman mailing list subscribers.

There is a script to do this, written in Python, mentioned on the Mailman wiki, accessible as mailman-subscribers.py

I’d kind of rather have something a bit more version-tracked, so I poked around at GitHub, and found larsks / mailman-subscribers

That was a little out of date; the last code was from a couple of years ago, so I forked, updated to the latest, and suggested that “larsks” pull it, which he did, quite quickly.

The “kudos” bit is that I noticed a bit of a blemish, in that the mailing list password was required to be on the command line, thereby making it visible to anyone with access to /usr/bin/ps on one’s system. I submitted a feature request, and Lars was so kind as to have this feature added so quickly that by the time I had the prototype of my Slony “subscriber backup” script working, I immediately needed to change it to make use of the lovely new password-in-file feature. Nice!

Installing git-annex from Debian unstable

Android, Unix | Posted by cbbrowne
Oct 12 2012

Installing git-annex from unstable

I happen to be a supporter of Joey Hess’ Git Annex Kickstarter project; no big bucks, but it seemed a good thing to help out.

I got in the stickers, that were my “project reward,” and figured I should start playing with the new results. I’m particularly keen on the planned Android client, but I should make some use of it before that comes available.

There’s good news, and bad news:

Good news
He has added in an assistant to provide interactive help in setting up repositories. It’s included in debian unstable, in a version released September 24th.
Bad news
I generally prefer using packages from debian testing, and it has a version released July 24th, well before any of this, and without any of Joey’s recent enhancements.

Fortunately, drawing in the September/~unstable~ version isn’t too terribly difficult. My /etc/apt/preferences.d/simple configuration has Pin-Priority values that prefer stable over testing, testing over unstable, and unstable over experimental (where enormous potential for breakage lies!).

As a consequence, installing the testing version is pretty easy, albeit involving an option I had to go looking for:

root@cbbrowne:~# apt-get -t unstable install git-annex
... leads to loading ...
Get:1 http://ftp.us.debian.org/debian/ unstable/main git-annex amd64 3.20120924 [7,411 kB]

And, with a run of % git annex webapp, it’s up and running!

Worth observing… The documentation tree includes the entirety of Joey’s blog documenting his development efforts.  Possibly excessive, but it’s certainly not to be called inadequate documentation.

Netboot via PXE

Unix | Posted by cbbrowne
Mar 14 2012

Netboot via PXE 2012-03-13 Tue

Some notes

To get this to work, you need…

BIOS ROM that supports PXE
True for most modern motherboards and/or NICs
DHCP server
To manage passing out configuration such as IP addresses and the next-server attribute.
TFTP server
With images
???
It looks for images based on most-to-least specific configuration

  • MAC address
  • IP subnet
  • Default

Some things PXE doesn’t support

It was created as a standard in 1999, and hasn’t been updated much since, so there are things that postdate it, and that are thus not supported.

WIFI
Likely to be troublesome anyways, as you surely want some authentication to get onto a WIFI network
IPv6
It wasn’t clear that it yet mattered in 1999…
DNS
It works with IP addresses only

DHCP discussion

  • Go look for next-server attribute
  • Some discussion of handling sharing subnets across a redundant set of DHCP servers

More worth looking at

Inquisitor
OSS hardware testing tool that’s better than memtest
gPXE
OSS bootloader

  • Supports DNS, so can forward requests broadly potentially anywhere
  • Can transfer data across additional protocols, such as HTTP, HTTPS, SAN (iSCSI, AoE)
  • Can support WIFI
  • Possibly IPv6

Farewell, Solaris, we hardly knew ye

Unix | Posted by cbbrowne
Apr 01 2010

I had long had on my low level “to do” list to consider trying out OpenSolaris, likely either in the form of Nexenta or as Debian/OpenSolaris (nearest link: OpenSolaris @ CSC).

Alas, I didn’t get around to it in time for the license change which essentially eliminates interest in it. The precis of the change: You’re free to download it, and use it for as long as 90 days, but then, you’re expected to pay Oracle for a service contract.

I guess the good news is that I didn’t waste any time on something I’d have to be “sunsetting” by the end of June 2010.

Nope, not “April Fools.”

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