Re: [SLUG] Network Real-Time Hot Filesystem Replication?
This one time, at band camp, Amos Shapira wrote: 1. You CAN'T mount a non-cluster-aware file system even read-only on the secondary node since the primary will change FS-structs under the feet of the read-only node and cause it to crash (because non-cluster-aware filesystems assume that they are the only ones who touch that partition). 2. You CAN mount read-write on multiple nodes if you use one of the cluster-aware filesystems (GFS and OCFS are regularly mentioned, but if you find any other cluster-aware file system then it sounds like it will work too). You're right, the example I was thinking of does not mount the filesystem on the secondary nodes until the primary goes down; once the FS is not mounted one of the secondaries takes over and mounts it read/write. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
[SLUG] BarCampCanberra1
G'day! Canberra is throwing its first BarCamp and apart from the usual Canberra web crowd, we're extending of course our invitation to interstate (and possibly even internationals) to come and visit Canberra for a fun-filled day of web geekery, awesome prizes and a delicous group dinner. The Rundown ~~~ * Who? Anyone who is interested in technology, the Internet and related topics. We have room for 60ish people, so bring your colleagues. * What? A good opportunity to share ideas and projects and to work with like-minded individuals. For more information on what a BarCamp is, see http://barcamp.org/. * When? From 10:00-17:00 on Saturday 19th April 2008 * Where? BarCampCanberra1 will be held at the CSIT Building, North Road, ANU. * Website? The blog is the place – http://. We'll be posting updated information about the event there. The info page on barcamp.org is at http://barcamp.org/BarCampCanberra . * Cost? Nothing! The event is free, water is free, lunch is free and dinner should be free too! Registration We'd love to have you register for the event – again this costs nothing, but it would greatly help us with numbers and gives you a chance to grab a tee at the right size and see what everyone is interested in talking about! Please register at http://barcamp.org/BarCampCanberra1 . Note there's also a new spot for you to indicate whether you'll be coming for dinner on the 19th, so add that if you haven't already. Please also sign up if you're going to be there for even one session on the day. Publicity ~ We need your help getting the word out so that this is a successful event. Tell your friends and colleagues. Particularly if you're a uni student or faculty/staff, work in the tech/web industry, know someone in the IT media or just know someone who might be interested, tell them! Blog it. Put a sign up at work. Email people. Pay for a full- page ad in The Canberra Times (just kidding). Point them to http://barcamp.org/BarCampCanberra and get them excited. 2020 Summit ~~~ Yes, the 2020 Summit is on the same weekend. We were first and will undoubtedly have the smarter crowd. The 2020 Summit will mean hotel availability in Canberra will be very tight and cheap rooms will be MIA. If you're planning to come from interstate, can I suggest you book your accommodation right now?! I can wait while you do that... You're back now? Good. If you are on a limited budget or can't get somewhere to stay, contact me and I can probably find a spare room in someone's house for you. We have several available. If you can offer a room, let me know. Sponsorship ~~~ No BarCamp runs successfully without the generosity of its sponsors. We have some fabulous support and while we'll thank then on the day, we'd like to mention them here: acidlabs, SMS Management and Technology, Web Directions and AussieHQ have all come through for us. And there might be another announcement today if you look at the wiki page - http://barcamp.org/BarCampCanberra. If your organisation might be able to help in some way, contact one of the BarCamp Unorganisers and let them know T-shirts T-shirts will be available at BarCamp Canberra. However numbers will be limited. We ended up ordering a total of 40 shirts. I hope we aren't too popular! ;) If you were in the first 20 registrations, you will get a custom order. For everyone else, you're going to have to make do with a grey marle shirt with a full-color logo. Sorry. Time was needed to make the order ship before the event. Thanks; we're really looking forward to seeing you all there! --- Simon Pascal Klein Concept designer (w) http://klepas.org (e) [EMAIL PROTECTED] -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Network Real-Time Hot Filesystem Replication?
Adrian Chadd wrote: I looked into it about a year ago and I couldn't find any simple way of doing this using free software. There's CODA/AFS as possible solutions but they still push the notion of master/slave rather than equal peers, which Chris mentions he needs (ie, constant synchronisation between each member rather than periodic pushback..) Chris, try looking at CODA/AFS support? OpenAFS was already considered. R/O replication is a pain, as is the whole volume host death problem. (ie: write volume goes away if the host holding the volume dies). I haven't looked at Coda recently. They still seem to be active (I thought they'd all abandoned ship for Intermezzo - seems I was wrong). I'll check it out sometime soon. C. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
[SLUG] kernel code for client ephemeral port allocation?
When a tcp (or udp) connection is setup, the client is allocated a source port - a so-called ephemeral port (this can be seen in the Local Address column of netstat). Out of interest, I wouldn't mind looking at the code that pseudo-randomly allocates this port number. Can anyone point me in the direction of the directory (or even file) I should look at? I'm not very familiar with the layout of the kernel code. -- Thanks, Sonia Hamilton http://soniahamilton.wordpress.com http://www.linkedin.com/in/soniahamilton -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] kernel code for client ephemeral port allocation?
Sonia Hamilton wrote: When a tcp (or udp) connection is setup, the client is allocated a source port - a so-called ephemeral port (this can be seen in the Local Address column of netstat). Out of interest, I wouldn't mind looking at the code that pseudo-randomly allocates this port number. Can anyone point me in the direction of the directory (or even file) I should look at? I'm not very familiar with the layout of the kernel code. LXR (Linux Cross Reference) is a really good resource: http://lxr.linux.no/linux Searching for ephemeral results in (among others): http://lxr.linux.no/linux/drivers/char/random.c#L1567 which I think may be what you are looking for. The hard way to do this of course would be just grab an unzip a source code tarball, cd into it and then: grep -r ephemeral . and see where that leads you. Have fun :-). Erik -- - Erik de Castro Lopo - The question of whether a computer can think is no more interesting than the question of whether a submarine can swim. -- edsger dijkstra -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] Network Real-Time Hot Filesystem Replication?
On Sat, 2008-04-05 at 09:52 +1100, Crossfire wrote: I've just spent some time quickly researching this to no real satisfaction. What I'm looking for is a way to do real-time hot-replication of a whole filesystem or filesystem tree over 2 nodes (and strictly 2 nodes) without STOMITH[1]. The scenario is I have two identical systems with local (software) RAID1. They will be tethered onto their internet feed via ethernet, and can optionally be tethered to each other via Gig. I want to be able to set it up so /home (and maybe other filesystems) are replicated from one to the other, in both directions, in real time so they can run in an all-hot redundant cluster. The environment should be mostly read-oriented, so I can live with write-latent solutions as long as they handle the race/collision gracefully (preferably by actually detecting and reporting it if they can't avoid it). The options I've investigated so far: * Lustre (MDS requirements[2] make this not an option) * GlobalFS (STOMITH requirements make this not an option. Oriented towards shared media too, which I am not using) * tsync (Naive concurrent operation model, but otherwise viable) * MogileFS (not quite what I was looking for, but none the less useful). * OpenAFS (read-only replication only, loss of the node hosting the write volume still renders the volume unwritable). Is anybody aware of any other options that I've missed? http://sourceforge.net/projects/ceph/ -Rob -- GPG key available at: http://www.robertcollins.net/keys.txt. signature.asc Description: This is a digitally signed message part -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] kernel code for client ephemeral port allocation?
Thanks! S. On Tue, 2008-04-08 at 08:13 +1000, Erik de Castro Lopo wrote: Sonia Hamilton wrote: When a tcp (or udp) connection is setup, the client is allocated a source port - a so-called ephemeral port (this can be seen in the Local Address column of netstat). Out of interest, I wouldn't mind looking at the code that pseudo-randomly allocates this port number. Can anyone point me in the direction of the directory (or even file) I should look at? I'm not very familiar with the layout of the kernel code. LXR (Linux Cross Reference) is a really good resource: http://lxr.linux.no/linux Searching for ephemeral results in (among others): http://lxr.linux.no/linux/drivers/char/random.c#L1567 which I think may be what you are looking for. The hard way to do this of course would be just grab an unzip a source code tarball, cd into it and then: grep -r ephemeral . and see where that leads you. Have fun :-). Erik -- - Erik de Castro Lopo - The question of whether a computer can think is no more interesting than the question of whether a submarine can swim. -- edsger dijkstra -- Thanks, Sonia Hamilton http://soniahamilton.wordpress.com http://www.linkedin.com/in/soniahamilton -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
[SLUG] managing .bashrc in subversion?
A process rather than technical question about subversion. My personal subversion repo is setup, works ok, etc. But I notice that subversion only lets you checkout a directory, not a file. I want to manage (for example) my .bashrc file in subversion - how to do it? I could check in all of /home/sonia, but I'd have to setup heaps of exclusions - nasty. I could put .bashrc in /home/sonia/bin (for example) and link to it cd; ln -s bin/.bashrc .bashrc) - a hack. Any other suggestions? -- Thanks, Sonia Hamilton http://soniahamilton.wordpress.com http://www.linkedin.com/in/soniahamilton -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
[SLUG] Content-Disposition: attachment; filename=
Sluggers, this may be a little off topic, but in my defense, the server is Linux running Apache and PHP. I'm generating a PDF on the fly using the FPDF libaries and sending it back to the client. If the client has a PDF viewer as a separate program then the filename that is passed by the Content-Disposition: header is available to the end user for use with save file as from the PDF viewer (in my case Evince). However this also works in Windows if the user hasn't installed Acrobat, both IE and FF offer to save the file using the name provided by the server. If however, the end-user has the adobe acroread plugin in either FF or IE, then the filename is lost and the acroread offers to save the file as the url (createPdf.php in this case). Does anyone know if this can be got around? Thanx P. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] managing .bashrc in subversion?
On Tue, Apr 08, 2008 at 03:04:59PM +1000, Sonia Hamilton wrote: A process rather than technical question about subversion. My personal subversion repo is setup, works ok, etc. But I notice that subversion only lets you checkout a directory, not a file. I want to manage (for example) my .bashrc file in subversion - how to do it? I could check in all of /home/sonia, but I'd have to setup heaps of exclusions - nasty. I could put .bashrc in /home/sonia/bin (for example) and link to it cd; ln -s bin/.bashrc .bashrc) - a hack. Any other suggestions? Some people put there entire home dir into version control. Seems excessive to me. Your hack is a popular hack and sounds pretty reasonable to me. I'd use, say, a dir called checkout or tree or svn rather than bin though. Matt -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] managing .bashrc in subversion?
On Tue, Apr 08, 2008 at 03:04:59PM +1000, Sonia Hamilton wrote: A process rather than technical question about subversion. My personal subversion repo is setup, works ok, etc. But I notice that subversion only lets you checkout a directory, not a file. I want to manage (for example) my .bashrc file in subversion - how to do it? I could check in all of /home/sonia, but I'd have to setup heaps of exclusions - nasty. I could put .bashrc in /home/sonia/bin (for example) and link to it cd; ln -s bin/.bashrc .bashrc) - a hack. Any other suggestions? I use a directory called ~/.dotfiles which contains a few *.bashrc and *.profile files, a vimrc, an Xdefaults, etc. I either include them from the top-level instance e.g. in .bashrc: test -d $HOME/.dotfiles . $HOME/.dotfiles/*.bashrc or just symlink them in. Cheers, Gavin -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
