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Virtual Box
by Andrew Greig 29 May '12

29 May '12

Hi, I have installed Virtual Box using the package manager for Suse 12.1, and I want to load a Win 7 64bit version, so I set up the Win7 VM but when I try to run it I get this error: Could not start the VM 0x80bb0005 (Could not launch a process for the machine 'Windows 7 (64 bit)' (VERR_ACCESS_DENIED)) What do I need to do to overcome this problem, please? Andrew Greig

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LVM snapshots - incremental to remote?
by Peter Ross 29 May '12

29 May '12

Hi all, I am using ZFS and "zfs snapshot/send/receive", to send ZFS snapshots to a "mirroring" server, just the incremental changes instead of the full snapshot everytime. I am aware of LVM snapshots but I never used it for incremental mirroring (and did not use them a lot, anyway, so I never looked too much under the hood - maybe I should have..) The kernel documentation makes me wonder whether it is possible to achieve the same with LVM: http://www.mjmwired.net/kernel/Documentation/device-mapper/snapshot.txt According to that, you have access to the COW storage as well: # lvcreate -L 1G -n base volumeGroup # lvcreate -L 100M --snapshot -n snap volumeGroup/base # ls -lL /dev/mapper/volumeGroup-* 93 brw------- 1 root root 254, 11 29 ago 18:15 /dev/mapper/volumeGroup-base-real 94 brw------- 1 root root 254, 12 29 ago 18:15 /dev/mapper/volumeGroup-snap-cow 95 brw------- 1 root root 254, 13 29 ago 18:15 /dev/mapper/volumeGroup-snap 96 brw------- 1 root root 254, 10 29 ago 18:14 /dev/mapper/volumeGroup-base 97 Is it possible to send copies of it to a remote server and apply the changes as described in the doc, using the merge options? The idea is to establish a "rotation regime" and just to send the -cow block device for continuous mirroring. Volker Grabsch, on a German mailing list, wrote about his improved "block-level rsync", https://github.com/vog/bscp He plans to use it for LVM mirroring. I just wondered whether he really has to search the whole block device for changes, if LVM knows about them already. Regards Peter

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Audio recording
by Mark Trickett 27 May '12

27 May '12

Hello All, I have a turntable with both analog and streaming USB outputs. It is one from Jaycar. What audio packages do I need to be able to record the streaming USB on Ubuntu and Debian? I have been looking, and there are vague references in the comments about recording, but not specifically stating that they can capture from USB. There is a CD of Windows software, and I am hoping that I do not need to enable something first from a Windows box. That is a SNAFU about which I do not yet have information, but will be looking at. I am thinking along the lines of some USB devices with the software distributed as files on the storage side, but flippable into an "active" device mode, such as some wireless "modems". Regards, Mark Trickett

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multiple atomic lvm snapshots
by James Harper 23 May '12

23 May '12

I have a windows VM running under Xen, and want to take snapshots of all the LV's it is using as it's physical disks, eg: vg0/lv0 - OS vg0/lv1 - FILESTREAM data vg1/lv2 - Databases vg2/lv3 - Database Logs vg's 0, 1, and 2 are on different sets of spindles to give higher IOPS. The problem is that the 4 snapshots need to be created atomically or else I'm going to get my database and transaction logs out of sync as there could be a few ms between the snapshot of lv2 and lv3. I think this isn't possible based on the documentation I've read, but maybe someone here knows different? Being Windows, I can use VSS to fudge it, but making an automatic procedure to do that in conjunction with LVM is more complicated than I want to think about right now! Thanks James

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IP gurus - TCP route cache clobbers IPsec xfrm
by Richard Andrews 21 May '12

21 May '12

I'm load testing a kernel mode IPsec setup. When IKE SAs renegotiate one or two IP packets get sent on the default route but after the tunnel is back up the TCP connection remains stuck on the default route by-passing xfrm policy until the TCP connection closes from retransmission failures. Ping is not affected the same way. It uses the tunnel as soon as a new child SA is up (even while TCP is broken). The next TCP connection uses the tunnel immediately. What can I do to fix this? Things I've tried that did not work: - conntrack -D - iptables -t raw ... -j NOTRACK # have verified the connections never appear in conntrack state - ip route cache flush # while a connection is stuck on the wrong path Kernel is 2.6.32. The TCP connections terminate on a loopback of the IPsec gateway. Ideas?

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grub init /bin/bash
by Colin Fee 21 May '12

21 May '12

A work colleague was reading a blog and in one of the comments was a statement saying that if you append init=/bin/bash to the grub boot line e.g. linux /vmlinuz-3.2.0-2-amd64 root=UUID=26585ddb-7dde-4a7e-b2c7-e32330bb4cc8 ro splash quiet init=/bin/bash you end up ia a shell with root privileges. So we had go at it and it works. We even tried booting with a USB tick in place to see if you could copy stuff to it and you can. The question that arose was what about network access? Do you have it? i.e. is there a tcp/ip stack running and if not how would you load one etc? -- Colin Fee tfeccles(a)gmail.com

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Debian testing no network on boot
by Geoff D'Arcy 21 May '12

21 May '12

I am running Debian testing and after a recent dist-upgrade networking no longer comes up automatically after booting. eth0 doesn't come up and more surprisingly neither does the loopback interface. I can configure these manually after booting but would obviously like to have the interfaces come up during boot process. During the upgrade a new networking program 'dnet' appears to have been installed which I suspect is related to this problem. During the install it wanted to be configured so it could change the mac address of my nic. Until it was configured eth0 was dead and wouldn't come up at all. Does anyone know what's wrong and how I can fix it? I'm tempted to uninstall dnet but it's obviously been installed for a reason. I've googled around and haven't been able to find anything that helps with a fix. Many thanks in advance Geoff

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ZaTab from ZaReason - a fully open Android tablet
by Chris Samuel 14 May '12

14 May '12

Hi folks, I originally sent this to the Melbourne Free Software Interest Group, but I reckon this would be of interest to others on this list and so I'm reposting here. Apologies to those who get duplicates! The US company ZaReason who build Linux systems (and are currently investigating opening a store in New Zealand) have been working on a fully open Android tablet for some time now. Well it's now appeared on their website for pre-orders (unlinked from the rest of the site, but tweeted about) here: http://zareason.com/shop/zatab.html I've blogged about it here: http://www.csamuel.org/2012/04/25/the-zatab-from-zareason-a-fully-open-sour… summarising what I've learnt from their tweets and from their site, plus noting that the status of their GPU driver is unclear (there is an open source driver in development, but its maturity is claimed to be low). The tablet ships with CyanogenMod 9 and an unlocked boot loader. I would presume it doesn't ship with the Google Apps as they're not open. I've asked via Twitter if they plan on having F-Droid installed by default. Timely given the interest in free software Android devices! cheers, Chris -- Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC This email may come with a PGP signature as a file. Do not panic. For more info see: http://en.wikipedia.org/wiki/OpenPGP

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Aborted an Ubuntu 12.04 Upgrade resulted in Booting into Blank Screen
by Wen Lin 14 May '12

14 May '12

Hi, Yesterday, a friend of mine proceeded with the Dist Upgrade to 12.04 process within the Update Manager of his Ubuntu 11.10 (64bit) system that I installed for him previously. (He did so before consulting me beforehand. Had he done so, I would have advised him to do the usual things before an upgrade, like: backup your system, etc; and I would have offered to do this with him together, because I had just done my upgrade recently). Well, everything was going well, until he got to the 4th point in the Upgrade Checklist (i.e. he saw 3 ticks in the checklist): - Preparing to upgrade - Setting new software channels - Getting new packages - Installing the upgrades - ... Later he told me that his PC seemed to have stuck at this point for a long time, no progress, PC seemed frozen. So he proceeded with the one option that many of us tend to do - pressed the RESET button. While I usually wouldn't do this myself, I can understand his rationale for doing so - aborting the upgrade so that he could get back to where he was. Instead, when his PC (there is no dual-boot in this machine - just pure Ubuntu) rebooted, after going pass the usual BIOS/Video card splash screen, followed by a quick splash of the Ubuntu logo, he got a blank screen. Not even the usual Ubuntu boot option list was displayed - just a black screen (with a tiny top bit coloured ubuntu purple). Subsequent rebooting attempts (powering off & on) got the same outcome. ** A quick note about the "computer freeze up" scenario during the upgrade before: From my own recent experience, actually the upgrade did not "freeze", it just sit there waiting for a user response. And the only way you can find this out is to expand the "Terminal" window within the Upgrade Wizard/Panel - which would show a message describing the issue at hand, and the user suppose to enter the relevant command before the whole install process would continue. @Ubuntu: How on earth a newbie would have known what to do in this scenario? More likely they would deem the process 'frozen' and did the next logical thing - reboot! I had used a Live CD to boot the PC up and confirmed that all his data (/home) is in a separate partition, so a clean install of 12.04 will not loose his data completely. However, that would mean I have to spend lots more time re-installing all his extra programs, installing codecs, configuring his scanner, etc (that I'd spent many hours/days fine-tuning in the previous 11.10 install). So my question to the LUV'ers out there, is there a way I can do to get back to his 11.10 version? Any tips will help as I have not done such rescue before. BTW, when I boot up an Ubuntu 12.04 amd64 Desktop Live CD on that PC, I didn't see a "Rescue mode" option. Should that be in the Alternate CD, or previous version of Ubuntu? This posting is meant not just to seek help as mentioned above, but also to warn those who are about to do an upgrade to 12.04 about that particular "Terminal" window trick - to avoid any unnecessary rebooting in the middle of an upgrade process. Cheers, Wen

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Re: Aborted an Ubuntu 12.04 Upgrade resulted in Booting into Blank Screen
by Peter.Ross＠bogen.in-berlin.de 14 May '12

14 May '12

On Mon, 14 May 2012, djitnah(a)greenwareit.com.au wrote: > There seem to be an odd thing with Precise install. It takes a really > long time when it gets to the language pack download/installation. I am very surprised because doenload and installation are quite separate things. An update only starts after a complete installation. I have done it a few times over the last weeks, so I am quite certain. Regards Peter

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