Suchergebnisse mit Tag „Linux“

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Ubuntu 14.04 Trusty: Mapping USB keyboards

I bought a Cherry G84-4700PUCDE-2 keypad about three years ago to have some "special multimedia keys" on the left side of my keyboard. It used to work after some trying until I upgraded to Ubuntu 14.04. The "trusty" release removed support for /lib/udev/findkeys and /lib/udev/keymap and replaced both by something called "hwdb". Converting turned out to be hard, because there are many wrong hints out there spread over the internet.

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Speed up RAID5/RAID6 write speed

I'm currently upgrading from Ubuntu 9.04 to Ubuntu 12.04, a long process as every upgrade does only one step. This is the price you pay for skipping all updates of the last years. It's even slower since I moved my root filesystem to a RAID6.

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Setting up a VServer without VServer support

My development server is a remote Vserver image running under VirtualServer or OpenVZ or anything else. I don't know because I don't care because other people do. I'm used to develop over SSH a lot, this is not problem, but I'm limited to CIFS as a Vserver can't provide NFS. NFS with cachefilesd was fast enough to work on the sources, at least most of the time, but CIFS is a complete fail. Browsing a small directory in my editor may easily take two or three minutes and saving files takes up to 30 seconds.
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Clean up old kernel images from Ubuntu

My laptop has "only" 20 GB for the root-partition / including home, usr and var. This is enough but recent updates dropped my free space below 1 GB and lately below 500 MB. I noticed that various kernel images & modules are wasting spaces but not used at all.
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Bottleneck file-I/O

Database load, disk, CPU and memory usage are known ressources on modern servers, but there is another one which is much more important: The I/O volume is limited and can't be raised as easy as all the others. It has no fixed limit and can't be measured (very good). It's a rare (maybe the most rare) good and shouldn't be wasted.
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AVM Fritz!Card, Asterisk and Ubuntu - a link collection

I'm running a small server at home which does storage services, telephone and MythTV in one box. The VoIP part is served by Asterisk (what else?) and a AVM FritzCard PCI.

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Mini sed Howto

sed ist das Universaltool zur massenweisen Dateimanipulation, allerdings schlägt sich seine unglaubliche Flexibilität auch in einer komplizierten Nutzung wieder, hier sind ein paar wichtige Anwendungsfälle und Aufrufbeispiele.
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Cherry Keypad G84-4700PUCDE-2 mit Ubuntu/Linux

Das Cherry Keypad G84-4700 ist ansich ein ganz normaler Ziffernblock, allerdings mit der kleinen Besonderheit, dass die Tasten programmierbar sind. Mit dem beiliegenden Cherry Windows-Treiber kann jede Taste beliebige Zeichenfolgen senden... Windows? Linux (in meinem Fall Ubuntu Desktop) wird von Cherry weder erwähnt, noch werden entsprechende Anfragen vom Support beantwortet. Doch die Verlockung auf zusätzliche Shortcuts war zu groß und so habe ich mir einfach das Keypad bestellt.
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Free storage: Ubuntu One

I didn't use any cloud storage service before, mostly because of security. I usually don't really care about my data being that attractive to big companies, but didn't feel well to have all my data stored in some unknown sky. Finally I tried Ubuntu One for one file not being worth to be stolen today.
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Setting up a OpenVZ/MongoDB/YAWF VE

The YAWF framework is available from CPAN, but it still needs a Webserver and some environment for working at it's best. This tutorial shows everything needed to set up a new OpenVZ VE (VServer) with MongoDB and YAWF framework on an existing OpenVZ host.

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Ubuntu 11.10 upgrade

Just upgraded to Ubuntu 11.10!

Upgrade took ~3-5 hours (don't know, download and installation were running in the background). First boot took some minutes, but it's worth the time. A new login screen, no real problems - same as for the last Ubuntu upgrades.

Things that did not work after upgrade:

  • Custom keybindings for changing the workspace
  • Switch from Unity to classic interface, but new Unity looks better and I'll try it again
  • Ekiga SIP Softphone lost settings
  • Pidgin icon in systray on new messages seems to be broken, but I have to test again
Things I expected to fail but working after upgrade:
  • My local PostgreSQL test server upgraded from 8.4 to 9.1, I expected a manual conversion of the old database (like the upgrader/installer told me) - but everything is fine without manual interaction
  • Truecrypt, VPN and my customer launcher script are working without any changes
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SVN-Verzeichnisse beim grep'en ignorieren

Wer kennt das nicht, ein "grep -r" durchsucht nicht nur den gewünschten Quellcode, sondern auch gleich alle ".svn"-Verzeichnisse im Checkout. Um die nervigen unerwünschten Ergebnisse zu unterdrücken, reicht ein einmaliger Eintrag von
export GREP_OPTIONS="--exclude-dir=\.svn --color=auto"
in ~/.profile, ~/.bash_profile oder ~/.bashrc (je nachdem welche existiert und vom eigenen Linux verwendet wird).
 
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Shrink NTFS partition and claim the free space for Linux/Ubuntu

Modern IT silently made some common problem go away: "No space left on device" became really rare during these days, but I started getting it last week when running some tests with huge data packages. My Ubuntu partition is 20 GB plus 8 GB swapspace and some more for a crypted data partition, but some 180 GB are still blocked by factory Windows 7 installed on this laptop.
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