dkg's blog

Articles in the misc category

1. looking at contents of virtual terminal remotely?

   There is a machine i have remote superuser access to which i know has some interesting info on one of the VTs (/dev/tty2 in particular in this case). I can try to scare up someone physically on-site to plug in a monitor, and painfully transcribe the text there by …

2. xen NAT routing issues

   I have the unfortunate circumstance of a xen machine with a single static, public IP address that needs to host multiple virtual servers internally. I don't want to bridge the main physical NIC to the virtual hosts, so i've created a bridge over a dummy NIC, and am trying to …

3. Re-enabling Disabled IRQs?

   I'm seeing more instances with hardware recently where the linux kernel gets an interrupt that it doesn't like or recognize, and it disables the IRQ entirely. Is there a way to get that IRQ re-enabled without restarting? My web searches haven't turned up anything fruitful.

   To be clear, the error …

4. USB Infrared recommendations for debian?

   I just noticed that one of the bodegas in my neighborhood sells "universal remotes" for a few USD. These are designed to work with arbitrary televisions, and can be switched/programmed to emit various IR signals. I've got an NSLU2 running sid, which feeds audio to my stereo using mpd …

5. interrupt (IRQ) prioritization under debian?

   Does anyone have pointers for how to ask a modern debian system to prioritize certain interrupts (IRQs) ahead of others?

   irqtune is the historical option, but it hasn't been updated for 10 years, and looks like a serious mess in debian at the moment (it's not in etch or lenny …

6. You should restart apache2 after DSA-1379 (libssl)

   The recently announced patch for openssl does a good thing: it looks for services known to use libssl and offers to restart them for you.

   However, it doesn't seem to notice apache2, which relies heavily on libssl when mod_ssl is enabled. You can check to see what services still use …

7. using debian system-created user accounts?

   Does anyone use the backup user for doing local system backups? or do you create a new user specifically for that?

   I ask because backup is debian-specific uid 34, provided by the base-passwd package. But reading /usr/share/doc/base-passwd/users-and-groups.txt.gz, i find only this:

   backup    Presumably so …

8. debian etch updated to 4.0r1

   It looks like debian etch just received its first point release, updating many useful packages with little nagging details that didn't make it into the first release.

   Aside from the security fixes, one update i'm particularly happy to see is the fix of the libneon26 kerberos/GSSAPI authentication mechanism, which …

9. tzconfig failing on xen instances

   I had trouble recently with a few xen etch instances built off the typical etch xen packages. The problem was that the domUs all reported time natively in UTC, despite my having used tzconfig to set it to my local timezone (i'm not in UTC).

   Within the domU, while i …

10. Xen: how do i alert a domU to an lvresize on dom0?

    I have a simple Xen setup with two domains, a dom0 and a domU. The physical disks are handled by LVM in the dom0, and certain logical volumes from the dom0 are exported to the domU as /dev/sda1, etc.

    If i resize one of the logical volumes from the …

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