593 reputation
1619
bio website jstarek.de
location Germany
age
visits member for 3 years, 4 months
seen Oct 14 at 20:15

Work

  • Member of the Scientific Computing group, DESY, Germany
  • Java, databases, unix-y stuff in a large-scale scientific computing facility

Hobby

  • Restoring Germany's oldest radio telescope, the Stockert 25 meter dish
  • Learning radio astronomy and high-frequency electronics
  • Design, construction and operation of the observatory's Linux network and scientific workstations

May
15
comment Will there be always a pair of same UID and GID?
"by default the UID and the GID are equal for ordinary users" -- actually, this statement is only true if you add "on some popular Linux distributions". Yes, Ubuntu et al. do it this way, but I would consider a common "users" group more of a default.
May
15
comment How can I stop dolphin from reading my entire home directory tree in order to make it usable on AFS?
I doubt that I can get our AFS admins to enable this flag for our huge cell just to let me check it out, but thanks for the pointer!
Mar
4
comment How to automatically start and shut down VirtualBox machines?
Two reasons: First, as stated in the original question, I did not want to alter the heavily modified guest OS if it wasn't really necessary. Secondly, and more importantly, this was intended to provide a clean way to automatically shut down all running VMs if the host was shut down.
Aug
29
comment What does mdadm's “spare” number mean?
I think the key information from the wiki page you linked to is this: "For raid5 there is an optimisation: mdadm takes one of the disks and marks it as 'spare'; it then creates the array in degraded mode." -- this would fit nicely with the observation made by derobert in the comments above. Apart from that, I'm afraid you misunderstood my question: I did not want to have 5 drives worth of space. Mentioning the 2 TB was just an observation.
Aug
29
comment What does mdadm's “spare” number mean?
@derobert, you are right: After the initial rebuild was finished, I got ARRAY /dev/md0 metadata=1.2 spares=1 name=[...] from mdadm --detail --scan and an equivalent info from /proc/mdstat.
Jun
5
comment How to automatically start and shut down VirtualBox machines?
Well, unfortunately "link rot" is a huge problem in those cases... I think, for posterity, the following two lines catch the basic idea behind your Link: It's creating a service that uses VBoxHeadless -s %i to start and VBoxManage controlvm %i savestate to stop the VM.
Aug
15
comment How can I stop dolphin from reading my entire home directory tree in order to make it usable on AFS?
Sorry for the late reply, I didn't see your comment here. Both systems are turned off.
Jul
6
comment How can I stop dolphin from reading my entire home directory tree in order to make it usable on AFS?
While disabling all preview functionality helped (thanks for that hint), the folder tree view (F7) still seems to try to open all folders. I don't quite understand this, since the first level of directories below the AFS root is cached locally and can be displayed without noticable delays in all other programs.
Apr
25
comment Impossible to log out from OpenSuSE's KDE menu
I don't know what I did wrong when I initially tested this, but testing again today, disabling the sound system solved the issue! Thanks for pointing that out.
Apr
25
comment Impossible to log out from OpenSuSE's KDE menu
Thanks for your hint, but those values were already commented out in my kdmrc. Also, setting them to valid values manually did not change anything.
Mar
7
comment Running VLC from a cronjob: How to get a DBUS connection?
Thanks for pointing out the meaning of the "inhibit interface error". It turned out to be non-fatal, indeed. I did not try cvlc since I need to run the controlling script as root, so I use vlc-wrapper already and did not want to complicate things further.
Feb
13
comment Impossible to log out from OpenSuSE's KDE menu
Interesting... I'm on a server without configured sound system, so I'll check if thtat's related.
Feb
13
comment Impossible to log out from OpenSuSE's KDE menu
It's simple: Clicking on the "logout" menu entry does not do anything except dismiss the launcher. There are no processes started, no log entries, nothing. I am both asking for ways how to diagnose this (I imagine there might be a way to make KDE's event handlers write more verbose info to the logs or something similar) and how to remedy the problem.
Jan
24
comment How to automatically start and shut down VirtualBox machines?
OK, while I think I'll settle for a management wrapper in practice, +50 to you for pointing to the initscript!
Jan
18
comment How to automatically start and shut down VirtualBox machines?
Thanks for your reply and welcome to unix.stackexchange.com! However, I'm afraid your answer also does not address my issue: acpipowerbutton simulates pressing the power button on a real machine, but after issuing this command on the host, the VM would, again, take some time to shut down.
Jan
8
comment How to automatically start and shut down VirtualBox machines?
Basically, this would work, the appliance can be reached in the entire LAN via its DNS entry. However, suppose I wrote a script that ssh'd into the appliance whenever the host goes down -- it would still have to block (pause) until the guest has shut down completely. This is precisely the point of my question: How can the script know when the guest is down, so that it can yield control flow back to SysV-Init and the host can continue to shut down?
Jan
8
comment How to automatically start and shut down VirtualBox machines?
Thanks for your reply, but unfortunately, this does not address my issue: I need to gracefully shut down the guest, i.e. issue a "shutdown -h now" inside the guest and have the host wait until the guest has shut down completely. None of the VBoxManage controlvm subcommands do that.
Dec
26
comment Impossible to log out from OpenSuSE's KDE menu
Thanks for the suggestion. This did, however, not change the situation.
Dec
23
comment Open GNOME session remotely through SSH
Sorry, didn't see your followup question... If the comparatively small CrunchBang community (which might lead to support problems in the future) is no problem for you, why not? -- The bit about starting the client fullscreen... most probably, but I don't have FreeNX handy right now.
Dec
3
comment Configuring OpenSuSE's xinetd
I tried to use the port number insted of the service name, but that failed. For the rest, see below :-)