Entries Tagged 'Uncategorized' ↓

So you cannot wait for a few days when the new ubuntu release comes out with updated opennebula packages, but you need them right now. What are the options ?

1. As the seasoned UNIX guy you are, you go with the good old tar xvfz & compile it yourself, wasting time both by managing its intrinsic dependencies, build dependencies and whatnot: #FAIL
2. You get more intrepid and try to perform some black magic with apt-pinning, risking your system’s integrity if you don’t do it properly (thanks @alexmuntada!): #FAIL
3. You realize that you want manageable distribution packages as opposed to unmantainable and hard to share hacks and go for the recommended alternative to apt-pinning (using deb-src): #WIN

Now, the #BIGWIN would have been giving back to the community by building my own package and contributing it via PPA or whatever packaging system you use, but that good practice will come eventually

I’ve just pushed a set of trivial modules system scripts that will hopefully ease your deployment of Cloudera Distribution for Hadoop 3 Beta 4 on your university cluster… partly, at least. This sad “partly” made me think about the current state of things on IT and HPC.

Over time I’ve learnt that there are several unexpected issues when deploying hadoop on custom clusters that you don’t own. Those are mainly related to software management policies, non-root access (being auto-deployment unfriendly), quotas and queueing or “batch” systems.

Ignoring most of these “fixable” issues, it becomes apparent that the most juicy problem for a sysadmin trying to get the most of hadoop-related tools is the batch system. Be it SGE, SLURM or other non-DRMAA compliant exotic batch system implementations, you’ll have to deal with annoying integration quirks at some point, granted.

Making it all work can be challenging to say the least… but the question is: does it have to be that hard ?

Continue reading →

Så din webbläsaren funkar inte en dag, vad kan jag gjörde ? Kör GDB med firefox !


$ firefox -g
+ MOZDIR=/home/cristobal/.mozilla
+ LIBDIR=/usr/lib/firefox-3.6.10
+ APPVER=
+ META_NAME=firefox
+ GDB=/usr/bin/gdb
+ DROPPED=abandoned
+ which /usr/bin/firefox
+ NAME=/usr/bin/firefox
+ [ xfirefox != x ]
+ NAME=/usr/bin/firefox
+ basename /usr/bin/firefox
+ APPNAME=firefox
+ [ ! -f /usr/lib/firefox-3.6.10/firefox ]
+ want_debug=0
+ [ 1 -gt 0 ]
+ want_debug=1
+ shift
+ [ 0 -gt 0 ]
+ FOUND=
+ [ -d /home/cristobal/.mozilla/firefox ]
+ FOUND=firefox
+ FOUND_BETA=
+ BETA_LIST=
+ [ -d /home/cristobal/.mozilla/firefox-3.1 ]
+ [ -d /home/cristobal/.mozilla/firefox-3.5 ]
+ [ -d /home/cristobal/.mozilla/firefox-3.6 ]
+ [ firefox != -a != ]
+ [ != -a firefox = ]
+ [ 1 -eq 1 ]
+ [ ! -x /usr/bin/gdb ]
+ mktemp /tmp/mozargs.XXXXXX
+ tmpfile=/tmp/mozargs.bnrfme
+ trap [ -f "/tmp/mozargs.bnrfme" ] && /bin/rm -f --
"/tmp/mozargs.bnrfme" 0 1 2 3 13 15
+ echo set args
+ echo sh /usr/lib/firefox-3.6.10/run-mozilla.sh /usr/bin/gdb
/usr/lib/firefox-3.6.10/firefox-bin -x /tmp/mozargs.bnrfme
sh /usr/lib/firefox-3.6.10/run-mozilla.sh /usr/bin/gdb
/usr/lib/firefox-3.6.10/firefox-bin -x /tmp/mozargs.bnrfme
+ CMDNAME_USER=firefox sh /usr/lib/firefox-3.6.10/run-mozilla.sh
/usr/bin/gdb /usr/lib/firefox-3.6.10/firefox-bin -x
/tmp/mozargs.bnrfme
GNU gdb (GDB) 7.1-ubuntu
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu".
For bug reporting instructions, please see:
...
Reading symbols from /usr/lib/firefox-3.6.10/firefox-bin...(no
debugging symbols found)...done.

(gdb) bt
#0 0xb7fe2422 in __kernel_vsyscall ()
#1 0xb7fbb245 in sem_wait@@GLIBC_2.1 () from /lib/tls/i686/cmov/libpthread.so.0
#2 0xacfe90e9 in event_wait () from /usr/local/lib/libtokenapi.so
#3 0xad32a4a4 in CInternalThreadObject::EventHandlingThread() () from
/usr/local/lib/personal/libP11.so
#4 0xad32dec6 in CHandleTokenEventThread::Run() () from
/usr/local/lib/personal/libP11.so
#5 0xacfe8934 in CThread_posix::RunInternal() () from
/usr/local/lib/libtokenapi.so
#6 0xacfe8981 in CThread_posix::RunProcess(void*) () from
/usr/local/lib/libtokenapi.so
#7 0xb7fb496e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8 0xb638ca4e in clone () from /lib/tls/i686/cmov/libc.so.6


Visst, /usr/local/lib/libtokenapi.so är den skyldige. Följa en andra post här om du vill fixa det, lycka till !

So you want to backup all your bas^H^H google documents ? You may do it manually, but isn’t it more interesting to do it by code ?

GoogleCL has been around for a while, but it’s becoming more stable and interesting as time goes on. Let’s see how to install it first, since the documented way on INSTALL.txt is broken at the time of writing these lines.

Continue reading →

It took a while to figure out this little annoying config issue while setting my android phone for development, so here it goes (thanks to comments on androidboss.com).

At the time of writing these lines, if you follow the official android documentation on this topic, you’ll probably get this frustrating error message.

$ ~/bin/android/tools/adb devices
List of devices attached
????????????	no permissions

Then, to fix it, you should edit your “/etc/udev/rules.d/50-android.rules” that way:

SUBSYSTEM==”usb”, SYSFS{idVendor}==”0fce”, MODE:=“0666″

Please, mind the “:=” on MODE, instead of just “=”. This last one doesn’t work on Ubuntu 10.04. After restarting the udev daemon connecting/desconnecting the device, you should get something like:

$ ~/bin/android/tools/adb devices
List of devices attached
CB511JDU5Y	device

Hope that helps !

UPDATE: Filed the issue on android bugtracker.