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Re: drbd rebooting
by Russell Coker 26 Feb '12

26 Feb '12

On Sat, 25 Feb 2012, Daniel Pittman <daniel(a)rimspace.net> wrote: > Adjust the behaviour settings in drbd.conf around split brain; they > have a bunch of configuration choices. See the "handlers" in the > manual for the situations and responses. What does drbd consider to be a split brain situation? root@nodeb# iptables -A OUTPUT -d $NODEA -j DROP I've setup a couple of nodes running under Xen. I ran the above command and since then I've had write commands on the ext4 filesystem mounted on nodea block, and I'm seeing lots of messages like the following in the kernel message log on nodea: [ 1831.024174] block drbd0: [drbd0_worker/844] sock_sendmsg time expired, ko = 4294967162 After 960 seconds (and some kernel panics from the ext4 code) it restarted itself. It seems that netfilter isn't catching all kernel generated packets because it managed to synchronise again. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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Installing Linux on the HP ProBook
by Andrew Miller 25 Feb '12

25 Feb '12

I have a new laptop for school, the HP ProBook S-series that I want to install one of the rolling release distros on (Debian/Arch/Gentoo). I think my laptop is the same make and model as the guy who came to the February Beginner's Workshop and was trying to install Linux Mint. I recognise some of the same partitions on my hdd that he had: Windows/C: is the main one with 383GB free of 442GB, HP_RECOVERY with 2.76GB free of 18.1GB and HP_TOOLS with 2.12GB free of 4.98 GB. I have not installed the other HP partition that lets you log in before the OS is loaded. I thought I had the option of installing Windows (ie they give me the installation discs and a blank hdd) but no, I was taken to the Windows installation immediately after the laptop was turned on, could not get out of it as there was no way to enter the BIOS and I received a call from Microsoft about 30 seconds later to help me activate my license. They were waiting on the line for me to complete the installation before they could help me so what was I supposed to say? My question to you is did anyone keep in contact with the guy who was trying to install Mint and do you know if he had any problems after deleting the HP_TOOLS partition? There is HP software within Windows and I'm wondering if it will detect that the partition is missing. Also can you recommend a good walkthrough for setting up a dual-boot system? I'm pretty good with Linux, it has been my sole OS for a couple years now, but I've never set up a dual-boot system before. I can't format the whole hdd because I need Windows for school and don't have the discs. I have preferred to set up a dual boot system by installing Linux -> creating extra partitions -> installing GRUB -> installing Windows but that's not an option. Regards, Andrew

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Re: drbd rebooting
by Russell Coker 25 Feb '12

25 Feb '12

On Sat, 25 Feb 2012, Daniel Pittman <daniel(a)rimspace.net> wrote: > The issue with doing this is that you will have two nodes writing > actively when you have a network problem, so you will be unable to > sync data back together correctly. The same issue, in fact, that any > two node cluster has in retaining function during a network split. You will only have two nodes writing at once if the secondary is made primary while the link is down. If the process of resource failover is managed by a cluster manager which does something smarter than just looking at a single network interface (*) then it may be able to deal with this when DRBD can't. Also there's the case where you have a manual failover in which case the person doing that can determine when there is either no data loss or acceptable data loss. The situation I'm trying to deal with is where there is an outage which isn't even long enough to raise a NAGIOS alert. It would be nice if DRBD could just keep working in that situation. In this case the risk of data loss is mitigated by the fact that any network problem which can prevent the DRBD code from communicating would also prevent writes as the daemons which write to DRBD filesystems communicate via the same network. > This is why two nodes and HA don't really go together in most cases: > you can't handle a whole bunch of problems in that case. Though, you > might find that turning off the DRBD handling and using pacemaker to > manage connectivity over some alternate media helps improve general > reliability. Thanks, I'll investigate that. (*) Does any cluster manager do that? It is theoretically possible to use Ethernet bonding to make a single device out of multiple ethernet ports/switches. But in practice there are many situations where that isn't possible, among other things last time I tested it (years ago) I had some problems with certain ethernet cards and it seemed to rely on a working router. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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drbd rebooting
by Russell Coker 24 Feb '12

24 Feb '12

It seems that the default behavior of drbd is to reboot the primary node of a cluster if it gets a split-brain. For a 3 node cluster this might make sense. For a 2 node cluster it means that if the secondary fails then the primary goes down too. How do I configure drbd to not do this and are there any issues with doing so? -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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Get Chrome (Chromium) or Forget Flash
by lev＠levlafayette.com 23 Feb '12

23 Feb '12

Adobe will no longer support Flash for Linux except when bundled with Chrome. http://www.computerworld.com/s/article/9224493/Adobe_to_Linux_users_Get_Chr… "Forget Flash" seems to be a reasonable option :)

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Fwd: Re: No Victoria in Debian testing?
by Tim Lyth 23 Feb '12

23 Feb '12

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Graeme, I recall seeing AU/Vic appear in the list when it was listed by state every time I tweaked the timezone, but I have been running on sid/unstable since Debian 3.0, with the timezone only being dealt with during a fresh install (and VERY occasionally when 'apt-get upgrade' or 'apt-get dist-upgrade' required). Sid have them listed by city with Melbourne being in there. :) Cheers, Tim Lyth On 23/02/2012 10:09 AM, Graeme Cross wrote: > Hi all. > > Has anyone done a recent install from a Debian testing/wheezy ISO > and found that Victoria has disappeared? > > I am in the process of doing one at the moment, using the text > installer, and Victoria is not listed as a timezone option (see > the attached screenshot). > > I selected "Australia" as the country earlier in the install, and > there is no scrolling option for this dialog box (ie. Victoria is > not hiding at the end of a scrolling list of states & > territories). > > This install is with the most recent build of the testing > netinst.iso (from 22 Feb, > http://www.debian.org/devel/debian-installer/) > > Has anyone else observed this or have I screwed up the install > process somehow? I thought I would ask here before reporting it as > a bug. > > Thanks Graeme > > > _______________________________________________ luv-main mailing > list luv-main(a)luv.asn.au http://lists.luv.asn.au/listinfo/luv-main -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJPRf2yAAoJEENQGX7xOJnV9PUIALQU4nyy6w5PrI5+JZ/ZvjXi hlNzs36IhDhQGBXSLnOAEQjlznTFVWY8gNgUrYbiajRcTwjx51TA+kt/KSz4ZPOM mp4HI9G2IgKVQhLLfI/O0ynCoD8evInOftiHP/7p48dwQJ7dLDRlJ4TLbHGj+mbL cfTtbcEPOV3oRZJ9J16OcXynH8FXkLLqPxlqdW/ACzINsaiV2ien02j2B/zs05sK 0ZAg4L0f5WsmgE5/x1i8W8KE/GfMHqoBajjXHbhuH7c4JH0EIVPMWlhhO/kdLZYa OUEvfNdnrM5lhnC+VjDZo5HVsjPZ1xuV1s567IlvBLw6uvYl6vghaJ4EU5mhTM0= =oWzj -----END PGP SIGNATURE-----

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No Victoria in Debian testing?
by Graeme Cross 23 Feb '12

23 Feb '12

Hi all. Has anyone done a recent install from a Debian testing/wheezy ISO and found that Victoria has disappeared? I am in the process of doing one at the moment, using the text installer, and Victoria is not listed as a timezone option (see the attached screenshot). I selected "Australia" as the country earlier in the install, and there is no scrolling option for this dialog box (ie. Victoria is not hiding at the end of a scrolling list of states & territories). This install is with the most recent build of the testing netinst.iso (from 22 Feb, http://www.debian.org/devel/debian-installer/) Has anyone else observed this or have I screwed up the install process somehow? I thought I would ask here before reporting it as a bug. Thanks Graeme

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Re: tcp load balancer
by Russell Coker 22 Feb '12

22 Feb '12

On Sat, 3 Sep 2011, Russell Sim <russell.sim(a)gmail.com> wrote: > On Fri, Sep 02, 2011 at 10:41:30AM +1000, Trent W. Buck wrote: > > Is that what haproxy is for? (I haven't used it myself, but it sounds > > close.) > > i have used haproxy, for http load balancing and my uni was using it for > LDAP load balancing, until one of the ldap servers started having > problems and haproxy was unable to detect the problems, so for a few > months ldap queries worked half of the time. So just be aware that > HAProxy might not understand there is a problem if your backends don't > behave correctly. Thanks for the suggestion, haproxy is now working well for me. I'm using it for SpamAssassin and the spamc client seems to recognise errors in the protocol. This combined with a round-robin configuration of haproxy should mean that if one of the spamd servers goes down then I get 1/4 of the incoming mail attempts deferred with a 45x code. This won't stop the system being usable but I will have to improve my monitoring to catch this. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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telstra website
by Brian May 19 Feb '12

19 Feb '12

Just trying out Telstra NextG and seeing if it resolves some of the problems I had with Three (e.g. high network charges when roaming on to Telstra). On of the first observations is that the website seems to be incompatible with Firefox, Chromium, and Android browser; in all three environments clicking the next button does nothing: https://www.my.telstra.com.au/myaccount/register Wish I could say I was surprised, but then my nose would start growing :-) Are there any workarounds? Besides get IE on a Windows box, which I assume should work? Then again, looking at the HTML, not sure how this should work under IE either, so maybe classing this as a Linux accessibility issue might be wrong? Unless there is some JavaScript that is suppose to alter this HTML to something that works. <a class="btn_blue submit" href="javascript:void(0)">Next ></a> Thanks -- Brian May <brian(a)microcomaustralia.com.au>

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btrfs -- what happens when a checksum fails on a single disk?
by Toby Corkindale 17 Feb '12

17 Feb '12

btrfs -- if you have your data stored multiply (ie. raid mirror) then if one copy goes bad, it'll resync it from the other copy. That's all well and good. Can you explain the failure modes for when a block checksum fails when you have data on a single disk? (I gather that there are both block and extent checksums, but correct me if I'm wrong) Essentially I was wondering whether you'd lose an entire file (or extent of a file) if the checksum fails, or whether you could still access the rest of the file but with just one block missing in the event of a bad sector. Cheers, Toby

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