Yahoo! 360° - basil's blog ..

Adding Disk on Xen Guest :

To resize the disk space of a xen DomU that is using Logical Volume Manager(LVM) is very easy. Below is step by step on how to do the resizing process.

Create a new image with the size that you require. Just give any meaningful name to the image. In this case I will use the name extended.img

# dd if=/dev/zero of=extended.img bs=1 count=1 seek=20G conv=notrunc

Add the new image to the configuration file of your DomU. In this example, the name of the domU is xen0

# vi /etc/xen/xen0
Add these line to it

disk = [ 'tap:aio:/path/to/xen/xen0.img,xvda,w','file:/path/to/xen/extended.img,xvdb,w' ]

Save

Start your domU

# xm create xen0

Access your domU

# xm console xen0

Once inside, check whether the new image is detected

# fdisk -lu

After confirm that your new hard disk image is detected, it is time we have to work on the lvm

Create new physical volume (PV) using the new hard disk image

# pvcreate -v /dev/xvdb

Check that you have successfully added the PV

# pvdisplay

Extend your existing volume group (VG) to include the new PV

# vgextend -v VolGroup00 /dev/xvdb

Check that you have successfully add the PV into the VG

# vgdisplay

Extend your logical volume (LV)

# lvextend -L +20G -v /dev/VolGroup00/LogVol00

Check that the extension has been added

# lvdisplay

If all the steps are successfully done, you have to resize the / partition

# resize2fs /dev/mapper/VolGroup00-LogVol00

You are done. Check your new hard disk space :)

# df -lh

Tags: xenguest, domu Monday January 5, 2009 - 11:13pm (PST) Permanent Link | 0 Comments

PAE kernel installation on Ubuntu machine

$ sudo apt-get update
  $ sudo sudo apt-get install linux-headers-server linux-image-server linux-server

$ sudo reboot

$ free -m

From Wiki:

http://en.wikipedia.org/wiki/Physical_Address_Extension

In computing, Physical Address Extension (PAE) refers to a feature of x86 and x86-64^[1] of physical memory to be used in 32-bit operating system support. PAE is provided by Intel Pentium Pro CPUs (including all later Pentium-series processors except the 400 MHz bus versions of the Pentium M), as well as by some compatible processors such as the Athlon and later models from AMD. processors that allows more than 4 Gigabytes systems, given appropriate and above

Tags: pae, kernel, ubuntu Tuesday December 30, 2008 - 12:55pm (PST) Permanent Link | 0 Comments

MySQL: 5.0.45-Debian_1ubuntu3

I have faced a strange issue on _1ubuntu3. The server was failing to listen on the allocated IP address eventhough it was listening on Localhost.

root@blackroot:~# telnet localhost 3306
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
H
5.0.45-Debian_1ubuntu3-logMJk]m1FO,9nB;@q;pA6*m^]
telnet> quit

[root@blackroot~]# telnet 192.168.5.10 3306
Trying 192.168.5.10...
telnet: connect to address 192.168.5.10: Connection refused
telnet: Unable to connect to remote host: Connection refused
[root@blackroot ~]#

After few minutes of investigation on system/network settings and firewall I had noticed a configuration on my.cnf which was blocking the connection to the IP address.

root@blackroot:/etc/mysql# grep bind-address my.cnf
bind-address = 127.0.0.1
root@blackroot:/etc/mysql#

Commented the line and restarted mysql. Bing... the machine started listening on IP address.
Yup..its a security feature but it killed my time.

root@blackroot:/etc/mysql# grep bind-address my.cnf
#bind-address = 127.0.0.1
root@blackroot:/etc/mysql#

Tags: ubuntu8.04, mysql5.0.45-debian_1ubuntu3, mysqlconnectionproblem Friday September 26, 2008 - 02:53pm (PDT) Permanent Link | 0 Comments

SMOKE PING

For Debian/Ubuntu system it is more than easy to configure a Smokeping
http://www.howtoforge.com/monitoring_network_latency_smokeping_debian_etch

Big thanks to the Opensource devels Tobi Oetiker and Niko Tyni for this awsome project. The tools associated with smokeping are fping and rrd tool.

Installation/Configuration on CentOS/Redhat Based machines:

rrdtool

yum install rrdtool

perl-CGI-SpeedyCGI

yum install perl-CGI-SpeedyCGI

If not available on the yum repository, manually push it by downloading the rpm.
http://dag.wieers.com/rpm/packages/perl-CGI-SpeedyCGI/

FPING

 
 yum install fping

Smokeping

wget http://oss.oetiker.ch/smokeping/pub/smokeping-2.4.2.tar.gz

tar xvzf smokeping-2.4.2.tar.gz
   mv smokeping-2.4.2 /usr/local/smokeping
   
 chown -R root:root /usr/local/smokeping
   
   (DON'T worry about the error  "chown: cannot dereference `/usr/local/smokeping/qooxdoo/qooxdoolink': No such file or directory)
   
   Copy and create new Configuration Files from the sample

 
  
   
   cd /usr/local/smokeping/bin
   for foo in *.dist; do cp $foo `basename $foo .dist`; done
   
   cd  /usr/local/smokeping/etc/
   for foo in *.dist; do cp $foo `basename $foo .dist`; done
   
   cd /usr/local/smokeping/htdocs
   for foo in *.dist; do cp $foo `basename $foo .dist`; done
   
   pico /usr/local/smokeping/bin/smokeping

Default	New
#!/usr/sepp/bin/perl-5.8.4 -w	#!/usr/bin/perl -w


or if a i386 system use
use libAdd a Link qw(/usr/pack/rrdtool-1.0.49-to/lib/perl);	use lib qw(/usr/lib/perl5/vendor_perl/5.8.5/i386-linux-thread-multi/auto/RRDs);
use lib qw(lib);	use lib qw(/usr/local/smokeping/lib);

use Smokeping 2.000008;

Smokeping::main("etc/config.dist");	Smokeping::main("/usr/local/smokeping/etc/config");

pico /usr/local/smokeping/htdocs/smokeping.cgi

Default	New
#!/usr/sepp/bin/speedy -w	#!/usr/bin/speedy -w

use lib qw(/usr/pack/rrdtool-1.0.33-to/lib/perl);	use lib qw(/usr/lib64/perl5/vendor_perl/5.8.5/x86_64-linux-thread-multi/auto/RRDs);
or if a i386 system use
use lib qw(/usr/pack/rrdtool-1.0.49-to/lib/perl);	use lib qw(/usr/lib/perl5/vendor_perl/5.8.5/i386-linux-thread-multi/auto/RRDs);
use lib qw(/home/oetiker/data/projects/AADJ-smokeping/dist/lib);	use lib qw(/usr/local/smokeping/lib);
use CGI::Carp qw(fatalsToBrowser);

use Smokeping 2.000008;

Smokeping::cgi("/home/oetiker/data/projects/AADJ-smokeping/dist/etc/config");	Smokeping::cgi("/usr/local/smokeping/etc/config");

cp /usr/local/smokeping/htdocs/smokeping.cgi /var/www/cgi-bin
   
   pico /usr/local/smokeping/etc/config

etc/config

*** General ***

Default	New
owner = Joe Random	owner = Basil
contact = joe@some.place.xyz	contact = basil@mindmatrix.in
mailhost = smtp.mailhost.abc	mailhost =smtp.minmatrix
sendmail = /usr/lib/sendmail
imgcache = /home/oetiker/public_html/.simg	imgcache = /var/www/html/smokeping/img
imgurl = ../.simg	imgurl = http:///smokeping/img
datadir = /home/oetiker/data/projects/AADJ-smokeping/dist/var	datadir = /usr/local/smokeping/var
piddir = /home/oetiker/data/projects/AADJ-smokeping/dist/var	piddir = /usr/local/smokeping/var
cgiurl = http://people.ee.ethz.ch/~oetiker/smokeping/smokeping.cgi	cgiurl = http:///cgi-bin/smokeping.cgi
smokemail = /home/oetiker/data/projects/AADJ-smokeping/dist/etc/smokemail.dist	smokemail = /usr/local/smokeping/etc/smokemail
tmail = /home/oetiker/data/projects/AADJ-smokeping/dist/etc/tmail.dist	tmail = /usr/local/smokeping/etc/tmail

syslogfacility = local0

*** Alerts ***

to =	to = me@your.place
from = smokealert@	from = smokealert@your.smoke.server

*** Presentation ***

template = /home/oetiker/data/projects/AADJ-smokeping/dist/etc/basepage.html.dist

template = /usr/local/smokeping/etc/basepage.html

*** Probes ***

binary = /usr/sepp/bin/fping

binary = /usr/sbin/fping

*** Targets ***

+ World

menu = World Connectivity

title= World Connectivity

++ INTERNET

menu = INTERNET

title = INTERNET

+++ GOOGLE

menu = GOOGLE

title = GOOGLE.COM

host = www.google.com


   Add The Img and PID directory and Change the Permission:

 
  
   
   mkdir -p /var/www/html/smokeping/img
   chown -R apache:apache /var/www/html/smokeping/img
   mkdir /usr/local/smokeping/var
   /usr/local/smokeping/bin/smokeping &
   
   Add to rc.local to enable it in Startup.

Tags: smokeping, monitoring, latency, linux Friday September 19, 2008 - 02:15pm (PDT) Permanent Link | 0 Comments

Yeah...spoiled one more summer weekend.
Here in my current location half of the year will be winter with snow and all lazy people like me always under blanket or trying some new drinks..
But some people used to do different stuffs in summer time (except me ;) ). Here I will be pocking around my old T60 and roaming around the internet. Hardly I used to see Sun nowadays....
I don't know whether I am a making a virtual universe in my small room.

Hmm...something good happened today early morning. A spark started from a speech from vivekananda in Youtube. Now trying hear more and more about him.. I am feeling something magical from his words..Its not only inspirational...but it will make you think ..think and think..

Let me think guys..will blog more soon!!

Sunday September 14, 2008 - 03:19pm (PDT) Permanent Link | 0 Comments

basil

basil's blog .. Full Post View | List View

HIGHLIGHTED POSTS

basil

Tag Cloud

basil's blog .. Full Post View | List View

HIGHLIGHTED POSTS