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April 14 2013

clone lvm via ssh

one just creates the targetlv in the same size as the srclv (8g in this case),
and when telling pv this size for the transfer it shows all the bells and
whistles it can .. even ETA :_)

dd if=/dev/srcvg/srclv | 
pv -p -e -t  -r -a -s 8G | 
ssh -i /home/user/.ssh/sshprivatekey -C -c arcfour -l root 172.x.y.z 'dd of=/dev/targetvg/targetlv'

February 21 2012

migrate lvm based xen dom0 to another machine ..

.. or even ignore that it is xen, basically this command moves the content of an logical volume to another server, reducing bandwidth using gzip compression.

prerequisites:

  • create lvm on target machine
  • install "pv" on src machine

run

root@src:# dd if=/dev/vg/disk bs=4096 | pv | gzip -1 | ssh -p2222 targethost.org "gzip -dc | dd of=/dev/vg/disk"

on your target machine you may want to:

  • resize2fs if the target lvm is larger
  • fsck.extX /dev/vg/disk on the target machine
  • edit the domU.cfg according to your target machine
  • mount /dev/vg/disk /mnt && chroot /mnt ** edit network, hostname, hosts

December 21 2011

get rid of that damn firefox DNS caching .. argh!

most annoying feature ever!

as with the increasing version number of the ffox less and less plugins do work, all ffox
DNS cleaning extensions didn't install with my recent version 9.something :/

so, here comes the plain way to do it:

  • about:config
  • yes, I'll be careful
  • new -> integer
  • network.dnsCacheExpiration as name and 0 as value
  • new -> integer
  • network.dnsCacheEntries as name and 0 as integer value

*phew

apropos: did you know about:robots?

try it, LOL :_)

November 27 2011

new linux audio findings

recent findings

streaming & radio tools

new linux aduio findings

recent findings

streaming & radio tools

August 02 2011

Gracefully loading configs in prosody

Assuming:

  • you have running prosody.im XMPP server
  • you have the telnet module enabled
  • you added modules and/or changed configs
  • you don't want to restart the service and force-disconnect the connected users

Here is what you do:

telnet localhost 5582

now we want to load a module

module:load("muc_log", "conference.example.com")

| Loaded for conference.example.com
| OK: Module loaded onto 1 host

if loaded first time just do

module:load("muc_log_http")

more trickier, when you need to clean up for a module reload

httpserver.new.http_servers[5290].handlers["muc_log"] = nil

now browser to http://conference.example.com:5290/muc_log/ (trailing slash needed!)

now: profit!

April 07 2011

Howto quick update diaspora

assuming you have a local git branch called my_diaspora with custom settings and changes (skins, header, footer etc) and serve that via e.g. nginx to from localhost:3000 to the outer world.

git checkout master
git pull
git checkout my_diaspora
git pull origin master
bundle install (you will probably be asked for a sudo or root password)
rake spec

if neccessary:

rake db:migrate && rake spec 

finally fire it up:

./script/server

now: profit!

hm, on multiple request, here is the nginx conf I use for diaspora:

server {
    listen 443;
    ssl on;
    ssl_certificate /path/to/my/cert.crt;
    ssl_certificate_key /path/to/my/cert.key;

    server_name diaspora.subsignal.org;

    access_log /var/log/nginx/nginx.access.log;
    error_log /var/log/nginx/nginx.error.log;

    root /path/to/my/diaspora/checkout/diaspora/public;

    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;

    location / {
            client_max_body_size 4M;
            client_body_buffer_size 128K;
            if (-f $request_filename/index.html) {
                    rewrite (.*) $1/index.html break;
            }
            if (-f $request_filename.html) {
                    rewrite (.*) $1.html break;
            }
            if (!-f $request_filename) {
                    proxy_pass http://diaspora;
                    break;
            }
    }
    error_page 500 502 503 504 /50x.html;
            location = /50x.html {
            root html;
    }

}

upstream diaspora {
    server 127.0.0.1:3000;
}

server {
    listen 80;
    server_name diaspora.subsignal.org;
    access_log /var/log/nginx/nginx.access.log;
    error_log /var/log/nginx/nginx.error.log;
    root /path/to/my/diaspora/checkout/diaspora/public;
    rewrite      ^(.*) https://diaspora.subsignal.org$1 permanent;
}

ok, but now profit!

March 09 2011

OVH Xen with multiple Failover IPs and a Load Balancing IP

As the previous post with bridged Xen setup was not good to make the LoadBalance IP running,
I again fiddled with routed setup and the things I learned from my friend TH. And, against
all the warnings in propably older OVH docs I just use now dev ethX as default gw in my
routing table(s). (I think before they introduced the virtual MAC they always blocked unknown
MACs (and therefore also random ones from virtualisation as well) on their switches. This
seems not to be the case anymore).

first, get two of your 3 failover IPs and attach them to your rootserver.

second, get at least a second rootserver and attach a LoadBalancing infrastructure to both
of them and then enable only your test candidate for now.

get your Xen in routed mode (xend-config.sxp):

(network-script network-route)
(vif-script     vif-route)

don't forget to restart xend!

and in domU /etc/network/interfaces easy as this: (where 2.2.2.254) is the default gw of your dom0)

auto lo
iface lo inet loopback

# fixed IP
auto eth0
iface eth0 inet static
    address 1.1.1.1
    netmask 255.255.255.255
    broadcast 1.1.1.1
    post-up /sbin/ip route add 2.2.2.2 dev eth0
    post-up /sbin/ip route add default dev eth0
    post-down /sbin/ip route del 2.2.2.2 dev eth0
    post-down /sbin/ip route del default dev eth0

# moving failover IP
auto eth1
iface eth1 inet static
    address 1.1.1.2
    netmask 255.255.255.255
    broadcast 1.1.1.2
    post-up /sbin/ip rule  add from 1.1.1.2 lookup 100
    post-up /sbin/ip route add 2.2.2.2 dev eth1 table 100
    post-up /sbin/ip route add default dev eth1 table 100
    post-down /sbin/ip rule  del from 1.1.1.2 lookup 100
    post-down /sbin/ip route del 2.2.2.2 dev eth1 table 100
    post-down /sbin/ip route del default dev eth1 table 100

# moving loadbalance IP
auto eth2
iface eth2 inet static
    address 1.1.1.3
    netmask 255.255.255.255
    broadcast 1.1.1.3
    post-up /sbin/ip rule add from 1.1.1.3 lookup 200
    post-up /sbin/ip route add 2.2.2.2 dev eth2 table 200
    post-up /sbin/ip route add default dev eth2 table 200
    post-down /sbin/ip rule  del from 1.1.1.3 lookup 200
    post-down /sbin/ip route del 2.2.2.2 dev eth2 table 200
    post-down /sbin/ip route del default dev eth2 table 200

now: profit!

March 08 2011

OVH Xen with mre than one IP

Getting new sh*t around the block, having new roots at OVH, cool offers, nice machines, decent services, okay price, worst UI for management webinterface ever :_)

first, get two of your 3 failover IPs and attach them to your rootserver.

to get xen bridged running you need to create virtual mac addresses in the ovh manager. assign those to the vif section of the domU config:

vif         = [ 'ip=1.3.3.7,mac=02:00:00:00:00:01,vifname=vif.serv01',
                'ip=1.3.3.8,mac=02:00:00:00:00:02,vifname=vif.serv02' ]

use in xend-config.sxp

(network-script 'network-bridge antispoof=yes')
(vif-script vif-bridge)

and in domU /etc/network/interfaces easy as this:

auto eth0
iface eth0 inet static
    address 1.3.3.7
    netmask 255.255.255.255
    broadcast 1.3.3.7
    post-up /sbin/ip route add default dev eth0

auto eth1
iface eth1 inet static
    address 1.3.3.8
    netmask 255.255.255.255
    broadcast 1.3.3.8
    post-up /sbin/ip rule add from 1.3.3.8 lookup 100
    post-up /sbin/ip route add default dev eth1 table 100

Active Directory lacks memberOf attribute for unknown reason ..

Using a binduser with password to read from LDAP/AD is common. Using the memberOf=Group attribute for authing is common, too. Both in combination can be a major fuckup: when your binduser is seeing the whole LDAP tree, except the memberOf attributes. Ok, rewrite your authing. Ok, do that once, twice, more often .. for every single service changing ootb auth to something non common. No no no, I don't buy that.

Well, I searched for ages, but the I found a vague hint, that enabling

"Pre Windows 2000 Compatibility" 

might help. An really, this info is digged up from the bottoms of the interwebbs. Golden needle in a haystack!

Enable the darn stopid named checkbox, and hey, finally you binduser can read what you binduser should be able to read anyways.

August 25 2010

"mkimage" command not found - U-Boot images will not be built


life can be so easy ...

phaidros@daddl:~/workspace/openrd/openrd.git$ sudo aptitude install uboot-mkimage
The following NEW packages will be installed:
  uboot-mkimage 
0 packages upgraded, 1 newly installed, 0 to remove and 5 not upgraded.
Need to get 9,876B of archives. After unpacking 57.3kB will be used.
Get:1 http://de.archive.ubuntu.com/ubuntu/ lucid/main uboot-mkimage 0.4build1 [9,876B]
Fetched 9,876B in 0s (61.7kB/s)      
Selecting previously deselected package uboot-mkimage.
(Reading database ... 52121 files and directories currently installed.)
Unpacking uboot-mkimage (from .../uboot-mkimage_0.4build1_i386.deb) ...
Setting up uboot-mkimage (0.4build1) ...

phaidros@daddl:~/workspace/openrd/openrd.git$ make ARCH=arm CROSS_COMPILE=/home/phaidros/workspace/openrd/arm-2010q1/bin/arm-none-linux-gnueabi- uImage
  CHK     include/linux/version.h
  CHK     include/generated/utsrelease.h
make[1]: `include/generated/mach-types.h' is up to date.
  CALL    scripts/checksyscalls.sh
  CHK     include/generated/compile.h
  Kernel: arch/arm/boot/Image is ready
  SHIPPED arch/arm/boot/compressed/lib1funcs.S
  AS      arch/arm/boot/compressed/lib1funcs.o
  LD      arch/arm/boot/compressed/vmlinux
  OBJCOPY arch/arm/boot/zImage
  Kernel: arch/arm/boot/zImage is ready
  UIMAGE  arch/arm/boot/uImage
Image Name:   Linux-2.6.33-rc8-00099-gb4cb3f9
Created:      Wed Aug 25 17:42:47 2010
Image Type:   ARM Linux Kernel Image (uncompressed)
Data Size:    2561572 Bytes = 2501.54 kB = 2.44 MB
Load Address: 0x00008000
Entry Point:  0x00008000
  Image arch/arm/boot/uImage is ready

yippieh, not longer complaining about missing mkimage .. thanks ubuntu (though possibly it came directly from Debian, so thanks to you uys as well !!! )

OpenRD .. finally


yay. finally I managed to mangle my OpenRD Client board .. sigh

I had troubles, that the marge of my dev board was never stating the correct
manufacturer ID for the NAND, which made flashing newer Uboot bootloader im-
possible.

This was the error popping up whatever I tried with Uboot/OpenOCD ...

unknown NAND device found, manufacturer id: 0x00 device id: 0x00
probing failed for NAND flash device

It drove me nuts until found a solution [1]. Yay!

Now with a newer Uboot (v3.4.19) I was suddenly able to install Debian on the
SD/MMC. For that I followed the great Howto under [2].

Heh, nice. So it finally boots Debian .. and having the D-I via serial console
in my screen (hint: screen tops minicom a million times: screen /dev/ttyUSB0 115200)
just feels very nice :)

But then I got hot and wanted moar .. MUAHAHA !! .. I finally have put the Debian
install from the SD/MMC onto the internal flash, but not before converting that
flash to UBIFS, following this guide [3] ff.

Heh, so now I have an OpenRD Client, booting Debian on choice from SD/MMC or the
internal flash with either kernel 2.6.32-5-kirkwood from Debian or the Sheevakernel
from [4] with 2.6.35.3 ..

I love it!

Further down I have a list with more good-to-read-in-case-links.

[1] http://code.google.com/p/openrd/issues/detail?id=7
[2] http://www.cyrius.com/debian/kirkwood/openrd/install.html
[3] http://plugcomputer.org/plugwiki/index.php/Installing_Debian_To_Flash#Convert_internal_flash_root_partition_to_UBIFS
[4] http://sheeva.with-linux.com/sheeva




hth :)

April 19 2010

doc of enhanced search with aptitude


linked the aptitude docs ..

.. as I regularly tend to forget, I linked the aptitude docs on http://subsignal.org/aptitude.

the enhanced search option you can find directly here:
The aptitude Search Term Quick Guide !!eleven!

now, use it.
then, fun :)

March 18 2010

shell-fm url format


what is the station url format in shell-fm?

using the nice and fantastic shell-fm player, the last-fm player in your beloved terminal,
you might wanna know which channels you can listen to and preferably in which
format you have to enter them.

All I found over the interwebz are here:

lastfm://user/${user}
lastfm://user/$USER/recommended
lastfm://user/$USER/playlist
lastfm://user/${user}/loved
lastfm://user/${user}/personal
lastfm://usertags/${user}/${usertag}
lastfm://artist/${artist}/similarartists
lastfm://artist/${artist}/fans
lastfm://globaltags/${globaltag}

Hehe, meanwhile crawling through the omniscient dump, I just found another friendly
cli player lastbash (homepage) and wikipedia article. neat.

can haz this channels e.g.:

lastbash "lastfm://globaltags/jungle"
lastbash "lastfm://globaltags/glitch"
lastbash "lastfm://user/phaidros7/neighbours"
lastbash "lastfm://artist/Salmonella Dub/similarartists"

now: fun!

March 14 2010

February 19 2010

Squeeze Mixxx Jack Portaudio AMD64


squeeze still has no jack support in libportaudio an amd64, ..

.. which is needed to use mixxx with jack

# apt-get source portaudio19  
# apt-get build-dep portaudio19

# cd /portaudio19-19+svn20071207/debian

remove ENABLE_JACK = no from line 48
ENABLE_JACK must be explicitely set to "yes"

# nano debian/rules

# dpkg-buildpackage -rfakeroot -b

# cd ../
# dpkg -i *.deb

mixxx still doesn't detect jack for me, stay tuned. Does work now!

(no) fun! (yet)

Debian Squeeze Nvidia Nano-Howto


10 commands for installing latest nvidia on squeeze

# echo <<EOF >> /etc/apt/sources.list \
deb http://ftp.tu-chemnitz.de/pub/linux/debian/debian/ unstable main non-free contrib \
deb-src http://ftp.tu-chemnitz.de/pub/linux/debian/debian/ unstable main non-free contrib \
EOF

# echo 'APT::Default-Release "testing";' >/etc/apt/apt.conf.d/00defaultrelease

# aptitude update
# aptitude install module-assistant nvidia-kernel-common build-essential
# m-a clean nvidia-kernel-source
# m-a purge nvidia-kernel-source
# m-a prepare
# aptitude install nvidia-kernel-source/unstable
# m-a a-i nvidia-kernel-source
# aptitude -t unstable install nvidia-glx nvidia-libvdpau1 nvidia-settings nvidia-libvdpau1-ia32 nvidia-glx-ia32

fun!

February 18 2010

creating debian installer on usb disk

install debian from usb stick

# wget http://http.us.debian.org/debian/dists/stable/main/installer-amd64/current/images/hd-media/boot.img.gz
# sudo umount /dev/sdb1
# zcat boot.img.gz > /dev/sdb1

plug stick out / in.

# wget http://ftp.de.debian.org/debian-cd/current/amd64/iso-cd/debian-504-amd64-netinst.iso
# mount

see where stick is mounted.

# cp debian-504-amd64-netinst.iso /media/Debian\ Inst/

happy installing!


February 13 2010

Xen subtarget in OpenWRT, yay!

OpenWRT on Xen patched, up and running

Thanx to jow and thomas h., we have now working support for Xen in OpenWRT!
see the following changesets for what is done:

So you now can choose x86 as target with Xen as subtarget.
nice. we give back to the connected funk-haeusers!


January 29 2010

locale foo

locale: Cannot set LC_ALL to default locale: No such file or directory

now and then this happenes to me on a new machine. usually I just set
LC_ALL, LC_LANG & LANGUAGE like this

root@gargamel:~# cat /etc/profile.d/locale 
export LANGUAGE = "en_US.UTF-8"
export LC_ALL = "en_US.UTF-8"
export LANG = "en_US.UTF-8"

still it complains about missing default locale. so we hafta do this:

localedef -v -c -i en_US -f UTF-8 en_US.UTF-8 

because usually en_US is probably defined.
we r done. we give back to the connected funk-haeusers!

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