May 2014 - luv-main - example.com

11 May '14

I am aspiring to be a Beginners Workshop groupie. Is there a Beginners Workshop this month? I cannot see anything on http://luv.asn.au/event/2014/04/10/month/all/all/1 Although I don't contribute, I do appreciate these, and would like to make sure I can get my fix this month... --

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Nexus tablet choice
by Russell Coker 07 May '14

07 May '14

I'm looking at buying a new tablet. It will mostly be for watching video, Youtube and movies downloaded from the net, but as with most general purpose computers it will get used for lots of other things. The main options I'm considering now are the Google Nexus tablets. The Nexus line seem to have good quality hardware, good specs, and reasonable prices. They also should be easier to root if I want to run Ubuntu or something on them later. For tablets with 16G of RAM the Nexus 7 is $299 and the Nexus 10 is $469. Currently the 32G Nexus 10 is out of stock so I'm mostly comparing the 16G Nexus 7 with the Nexus 10, if I choose the Nexus 7 then I'll think about whether it's worth paying for extra storage (probably will be given that there's no SD card support). Does anyone have any experience with them? What about comparing 10" and 7" tablets generally? Obviously 10" is better for watching movies and a lot better if more than one person is watching. 10" should also be better for blogging. Is the 10" tablet worth the extra $170 and losing the option of more storage (or alternatively waiting for Google to get stock)? https://play.google.com/store/devices/details?id=nexus_7_16gb_2013 https://en.wikipedia.org/wiki/Nexus_7_(2013_version) https://play.google.com/store/devices/details/Nexus_10_16GB?id=nexus_10_16gb https://en.wikipedia.org/wiki/Nexus_10 Above are the Play Store and Wikipedia pages for the tablets in question. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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mailing list servers bouncing email
by Russell Coker 06 May '14

06 May '14

It's a common configuration to have non-member posts to a mailing list be rejected. It seems that most list servers run from /etc/aliases or similar which means that mail has already been accepted by the time the list server sees it. Once mail has been accepted (SMTP code 250) it can be sent on, discarded, or a bounce message can be sent. In the case of spam (which often accounts for most non-member mail to a list) we don't want to generate a bounce message as that hurts innocent third parties. But in the case of members who send mail from their wrong address we want to inform them. Ideally a non-member post to a mailing list would get a SMTP level rejection (SMTP code 55x). When a real person sent the mail they get a bounce message and can re-send if appropriate, if a spam bot sent the mail then it gets discarded. http://postfwd.org/ What's the best way of getting it to work that way? I'm idly considering writing a script to take the list of members from Mailman and automatically generating a Postfwd configuration from it, the above URL describes Postfwd. One benefit of using Postfwd in that manner could be that anyone who subscribes to one list could be allowed to send mail to all lists on the same server, it doesn't have to be that way (Postfwd is configurable and generating more rules isn't difficult) but it seems like a good idea. The Mailman controls seem to only control posting access based on the membership of the list in question. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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Ubuntu Trusty upgrade
by Toby Corkindale 02 May '14

02 May '14

Hi all, Just thought I'd share some good news. Upgrading from Saucy to Trusty on a desktop was quite painless. By far and away the easiest one I've had with Ubuntu -- and I do tend to have a moderately customised system with non-free drivers and a whole lot of extra PPAs added to the apt sources. -Toby -- Turning and turning in the widening gyre The falcon cannot hear the falconer Things fall apart; the center cannot hold Mere anarchy is loosed upon the world

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PGP and IPSec
by Peter Ross 02 May '14

02 May '14

Hi, is there an established way of using PGP to assist an IPSec setup? I only found this here http://tools.ietf.org/html/draft-ietf-ipsec-openpgp-01 But it does not seem to be fleshed out. I could imagine to use PGP to create a single connection which is then used to communicate a shared key which is then used for IPSec setup. I somehow think it should be there but have not seen it. Regards Peter

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Disabling Debian/Ubuntu apt archives
by Toby Corkindale 02 May '14

02 May '14

Hi, Linux distros using the apt package management system tend to cache downloaded packages in /var/cache/apt/archives/ If you have many very similar machines set up, then you'll almost certainly have a HTTP proxy cache setup for them to retrieve packages through, to reduce huge duplication of downloads. This essentially obsoletes the /var/cache/apt/archives, though. And when you're running dozens of virtual machines, it'd be nice to avoid storing all these duplicate files. What's the right way to disable it? I see I can adjust the max size and age via the APT::Archives::Max{Age,Size} parameters, but what about just turning it off altogether? Cheers, Toby

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Re: Disabling Debian/Ubuntu apt archives
by Peter Ross 01 May '14

01 May '14

Tim Connors wrote: > I just share /var/cache/apt/archives by nfs between all my systems (and > make sure you don't update 2 hosts at once unless they're different > arches). I am using ZFS for a package repository which is mounted inside the jail or host system I want to upgrade (it's part of a script which can do that on the fly for all jails+host when needed) Transfer between hosts happens via zfs send/receive. Having one mountpoint at the time solves the "two at the time" problem - and scripting others (e.g. the right repository for the right system). I can imagine similar usage when using Linux and btrfs. Regards Peter

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