Comments for High Tech Sorcery http://hightechsorcery.com technology indistinguishable from magic Mon, 02 Apr 2012 15:18:49 +0000 hourly 1 http://wordpress.org/?v=3.3.2 Comment on Resources for working with ICalendar, Ruby, and Rails by Pat http://hightechsorcery.com/2010/03/resources-for-working-with-icalendar-ruby-and-rails/comment-page-1/#comment-10046 Pat Mon, 02 Apr 2012 15:18:49 +0000 http://hightechsorcery.com/?p=70#comment-10046 Which library did you end up using? Which library did you end up using?

]]> Comment on how to disable Rack::Cache in Rails 3.1 by Tony Primerano http://hightechsorcery.com/2011/09/disable-rackcache-in-rails-3-1/comment-page-1/#comment-10045 Tony Primerano Sun, 01 Apr 2012 01:33:30 +0000 http://hightechsorcery.com/?p=321#comment-10045 Simpler option is to add this to your application.rb config.action_dispatch.rack_cache = nil worked for me. http://blog.tonycode.com/archives/418 Simpler option is to add this to your application.rb

config.action_dispatch.rack_cache = nil

worked for me.

http://blog.tonycode.com/archives/418

]]> Comment on Getting Xen 4.0.1 working in Debian 6.0 by Jon http://hightechsorcery.com/2011/03/getting-xen-4-0-1-working-in-debian-6-0/comment-page-1/#comment-10033 Jon Fri, 23 Mar 2012 18:37:05 +0000 http://hightechsorcery.com/?p=177#comment-10033 After you make these changes, did you have to restart xend? I am not able to make this work for tap:aio still, my guests all crash. After you make these changes, did you have to restart xend? I am not able to make this work for tap:aio still, my guests all crash.

]]> Comment on Playing with LXC by Arie Skliarouk http://hightechsorcery.com/2011/08/playing-with-lxc/comment-page-1/#comment-10024 Arie Skliarouk Mon, 19 Mar 2012 14:23:30 +0000 http://hightechsorcery.com/?p=313#comment-10024 Isolation: this is an popular mistake to bind mount host's /dev onto guests /dev. No udev: You need to install udev signals simulating upstart configuration file. After that nobody notices there is no udev. Isolation: this is an popular mistake to bind mount host’s /dev onto guests /dev.

No udev: You need to install udev signals simulating upstart configuration file. After that nobody notices there is no udev.

]]> Comment on Open Source Virtualization – thoughts on the state of various alternatives by Jonas http://hightechsorcery.com/2011/02/open-source-virtualization-thoughts-on-the-state-of-various-alternatives/comment-page-1/#comment-9992 Jonas Mon, 05 Mar 2012 18:09:29 +0000 http://hightechsorcery.com/?p=136#comment-9992 @Aaron, similar to my situation. I needed a lab machine with simple resource management, such as no-brainer network administration, storage management and monitoring as well as CPU resource control. VMWare ESXi has it all down close to an art form and that *free* (as in beer) product is *polished*. Sure it can't run with the wide range of hardware Linux supports and it can be a bit of a pita to get all required components together and working (mobo, nic, SATA HBAs and suitable disks + the hypervisor software). However when these four hardware pieces have been identified, setting up and administrating an ESXi environment is a breeze. I've evaluated kemu / kvm before, but that offering really felt like a science project, requiring too much fiddling around and never quite working for the cases I needed VMs for. VMWare Server and VirtualBox are not options as they lack key components such as hardware assisted virtualization and stable drivers, allowing close to bare-metal performance of the VM). As for Container virtualization, leveraging those capabilities from an ESXi VM providing those mechanisms (Solaris, BSD or Linux) works perfectly and gives me all the benefits of container based virtualization, while still offering a simple option for full and para-virtualization from the ESXi layer itself. I'll wait another three years I think, before once again checking the "state of linux virtualization", as I don't foresee much will have changed judging by historical rate of progress. @Aaron, similar to my situation.
I needed a lab machine with simple resource management, such as no-brainer network administration, storage management and monitoring as well as CPU resource control. VMWare ESXi has it all down close to an art form and that *free* (as in beer) product is *polished*.

Sure it can’t run with the wide range of hardware Linux supports and it can be a bit of a pita to get all required components together and working (mobo, nic, SATA HBAs and suitable disks + the hypervisor software). However when these four hardware pieces have been identified, setting up and administrating an ESXi environment is a breeze.

I’ve evaluated kemu / kvm before, but that offering really felt like a science project, requiring too much fiddling around and never quite working for the cases I needed VMs for. VMWare Server and VirtualBox are not options as they lack key components such as hardware assisted virtualization and stable drivers, allowing close to bare-metal performance of the VM).

As for Container virtualization, leveraging those capabilities from an ESXi VM providing those mechanisms (Solaris, BSD or Linux) works perfectly and gives me all the benefits of container based virtualization, while still offering a simple option for full and para-virtualization from the ESXi layer itself.

I’ll wait another three years I think, before once again checking the “state of linux virtualization”, as I don’t foresee much will have changed judging by historical rate of progress.

]]> Comment on Fixing netbeans in ubuntu by leterhaar http://hightechsorcery.com/2011/05/fixing-netbeans-in-ubuntu/comment-page-1/#comment-9914 leterhaar Sun, 11 Dec 2011 12:24:16 +0000 http://hightechsorcery.com/?p=271#comment-9914 If this still doesn't work, you might try to associate .js files manuall with javascript. To do this, go to Tools - Options - Files and change the filetype associated with .js to 'text/javascript'. Fixed my problem (the solution above didn't). If this still doesn’t work, you might try to associate .js files manuall with javascript. To do this, go to Tools – Options – Files and change the filetype associated with .js to ‘text/javascript’. Fixed my problem (the solution above didn’t).

]]> Comment on The sad state of linux desktop environments by The sad state of linux desktop environments « High Tech Sorcery | Pici's Ubuntu Blog http://hightechsorcery.com/2011/12/the-sad-state-of-linux-desktop-environments/comment-page-1/#comment-9878 The sad state of linux desktop environments « High Tech Sorcery | Pici's Ubuntu Blog Sat, 03 Dec 2011 01:20:52 +0000 http://hightechsorcery.com/?p=353#comment-9878 [...] more here: The sad state of linux desktop environments « High Tech Sorcery This entry was posted in all, and, DE, Default, Desktop, direct, do, fedora, for, GNOME, Gnome 3, [...] [...] more here: The sad state of linux desktop environments « High Tech Sorcery This entry was posted in all, and, DE, Default, Desktop, direct, do, fedora, for, GNOME, Gnome 3, [...]

]]> Comment on Firefox seems to load content in noscript tags when javascript is enabled by Yves http://hightechsorcery.com/2011/04/firefox-seems-to-load-content-in-noscript-tags-when-javascript-is-enabled/comment-page-1/#comment-9682 Yves Thu, 27 Oct 2011 10:09:31 +0000 http://hightechsorcery.com/?p=234#comment-9682 Here's why: https://bugzilla.mozilla.org/show_bug.cgi?id=342299 It only happens in XHTML mode because Firefox needs to parse the whole document tree. In HTML mode it won't load stuff from . Don't ask me why it needs to actually load the resources it parsed, but it does. And they won't fix it. Here’s why: https://bugzilla.mozilla.org/show_bug.cgi?id=342299

It only happens in XHTML mode because Firefox needs to parse the whole document tree. In HTML mode it won’t load stuff from . Don’t ask me why it needs to actually load the resources it parsed, but it does. And they won’t fix it.

]]> Comment on Getting Xen 4.0.1 working in Debian 6.0 by Windows server running under Xen under OpenNebula « CeRch Systems Blog http://hightechsorcery.com/2011/03/getting-xen-4-0-1-working-in-debian-6-0/comment-page-1/#comment-9679 Windows server running under Xen under OpenNebula « CeRch Systems Blog Wed, 12 Oct 2011 15:43:10 +0000 http://hightechsorcery.com/?p=177#comment-9679 [...] on Debian 6.0 has some problems as outlined by http://hightechsorcery.com/2011/03/getting-xen-4-0-1-working-in-debian-6-0/ , make sure you apply fixes as specified there to dom0 otherwise the tap driver will not [...] [...] on Debian 6.0 has some problems as outlined by http://hightechsorcery.com/2011/03/getting-xen-4-0-1-working-in-debian-6-0/ , make sure you apply fixes as specified there to dom0 otherwise the tap driver will not [...]

]]> Comment on Using an SSD as a cache device by Will Smith http://hightechsorcery.com/2010/07/using-an-ssd-as-a-cache-device/comment-page-1/#comment-9666 Will Smith Sun, 18 Sep 2011 04:31:04 +0000 http://hightechsorcery.com/?p=109#comment-9666 I am running flashcache on my home server, 60Gb of SSD caching a RAID5 array of 3x2Tb hard disks. Ubuntu server, 2.6.38-11. Works well in write-through. In write back the write-backs never seem to happen, even if I take the maximum dirty seconds parameter right down. Then when I rebooted my machine, kernel panic. Haven't isolated it further. Moral : stick to write-through for the moment. I am running flashcache on my home server, 60Gb of SSD caching a RAID5 array of 3x2Tb hard disks.

Ubuntu server, 2.6.38-11.

Works well in write-through.

In write back the write-backs never seem to happen, even if I take the maximum dirty seconds parameter right down. Then when I rebooted my machine, kernel panic. Haven’t isolated it further.

Moral : stick to write-through for the moment.

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