LearnAdmin

How to reset winsock entries and reset TCP/IP stack in windows7

2012-01-13T11:16:00.000+05:30

goto command prompt then enter below two commands

netsh winsock reset catlog

netsh int ip reset reset.log hit

then reboot your pc

Step by Step method to install Media Wiki

2011-12-15T23:29:00.000+05:30

Step-By-Step Installation Procedure of Mediawiki on Ubuntu Server 9.04 or Other Distribution as well (If it is rpm distribution replace aptitude/apt-get to yum)

Ubuntu installation using these commands:
aptitude Update
aptitude install apache2 mysql-server php5 php5-mysql mediawiki php5-gd -y

After installation Make sure that Apache is up and running

gedit /etc/apache2/apache2.conf

(Note that it’s a good idea to back up any system configuration file before editing it. You can do so quickly by using sudo cp /etc/apache2/apache2.conf ~/Desktop to save a copy to your Desktop. You can of course use vi or emacs or the editor of your choice, but most new users seem to prefer gedit’s GUI.)

Once you are in gedit, add the following line to the end of the file:

AddType application/x-httpd-php .html

Save the file and exit gedit.
Now we’ll need to prepare MySQL for use with MediaWiki. First, you’ll need to run MySQL’s install script:
sudo mysql_install_db
Once this is completed, log into the MySQL command-line client:
mysql -u root –p
Enter your MySQL root user password from above, and you’ll find yourself at the MySQL> local client prompt. First, create a database for MediaWiki to use:
CREATE DATABASE mediawiki;
(Note that all commands entered in the MySQL local client must end with a semicolon to denote the end of the statement.)

Once the database is created, you’ll need to create a database user so MediaWiki can access your newly created database. While still in the MySQL command line client, type this:

CREATE USER mediawikiuser;

Then create a password for your new user (note that your password will actually go within the quotation marks, and is case-sensitive):

SET PASSWORD FOR mediawikiuser = PASSWORD(“password”);

Now that you’ve got your MediaWiki database and your MediaWiki database user, you’ll need to grant the user all permissions on the database (again, the password goes within the quotation marks, and is case sensitive):

GRANT ALL PRIVILEGES ON mediawiki.* TO mediawikiuser@localhost IDENTIFIED BY ‘password’;

(Make sure to append “@localhost” to mediawikiuser; otherwise you might get a database error later on when MediaWiki tries to run its installation script.)
Configure MediaWiki
gedit /etc/mediawiki/apache.conf
Remove the '#' on the third line so that line reads:

Alias /mediawiki /var/lib/mediawiki

/etc/init.d/apache2 restart
http://localhost/mediawiki ( Follow up the Index page Configuration U need to give the database username and password etc)
Note: makesure user the username, password and Database should be correct

Step by step Method to install OpenNMS

2011-12-15T22:59:00.003+05:30

Note: Make sure snmp is already installed on the Server. If not run

apt-get install snmpd -y

Add the OpenNMS Repository to Your sources.list

deb http://debian.opennms.org stable main
deb-src http://debian.opennms.org stable main

Add the OpenNMS PGP Key to APT

wget -O - http://debian.opennms.org/OPENNMS-GPG-KEY | sudo apt-key add - 
apt-get update

(or)

apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 4C4CBBD9
apt-get update

Installing PostgreSQL

apt-get install postgresql-8.3

Modify pg_hba.conf file in /etc/postgresql/8.3/main/

comment all other lines in this file.

local   all         all                               trust
# IPv4 local connections:
host    all         all         127.0.0.1/32          trust
# IPv6 local connections:
host    all         all         ::1/128               trust
host    all         all         192.168.1.0           255.255.255.0 trust     <=== Double check 192.168.1.0 it can be 10.10.20.0

Edit postgresql.conf to Allow TCP/IP Connections

vi /etc/postgresql/8.3/main/postgresql.conf 
Uncomment following line 
listen_addresses = 'localhost'

Restart the Postgresql Database

/etc/init.d/postgresql-8.3 restart

Installing OpenNMS

apt-get install opennms

we need to set opennms home in /etc/environment

add the following line
OPENNMS_HOME=/usr/share/opennms 
execute the following command for setting OPENNMS_HOME for existing session 
export OPENNMS_HOME=/usr/share/opennms

Before you can run the post-install, OpenNMS needs to be configured to use an appropriate Java Runtime Environment (JRE). The OpenNMS tool runjava is used to set this up, and it can either search for a suitable JRE or you can tell it exactly which JRE to use.

# /usr/share/opennms/bin/runjava -s

This tool will setup the opennms database within PostgreSQL among other things.

# /usr/share/opennms/bin/install -l /usr/local/lib -dis

you should see similar output after executing above command

- checking table "qrtz_fired_triggers"...
- checking table "qrtz_fired_triggers"... CREATED
- granting access to 'qrtz_fired_triggers' for user 'opennms'... DONE
- checking table "qrtz_scheduler_state"...
- checking table "qrtz_scheduler_state"... CREATED
- granting access to 'qrtz_scheduler_state' for user 'opennms'... DONE
- checking table "qrtz_locks"...
- checking table "qrtz_locks"... CREATED
- granting access to 'qrtz_locks' for user 'opennms'... DONE
- creating tables... DONE
- inserting initial table data for "categories"... OK
- inserting initial table data for "qrtz_locks"... OK
- inserting initial table data for "distPoller"... OK
- checking if iplike is usable... YES
- checking for stale eventtime.so references... OK 
Installer completed successfully!

Start opennms using the following command

/etc/init.d/opennms start

OpenNMS will take some time to start, you can check the status of opennms using the following command

root@server1:/usr/local/lib# /etc/init.d/opennms status

OpenNMS.Eventd         : running
OpenNMS.Trapd          : running 
OpenNMS.Queued         : running
OpenNMS.Actiond        : running
OpenNMS.Capsd          : running
OpenNMS.Notifd         : running
OpenNMS.Scriptd        : running
OpenNMS.Rtcd           : running
OpenNMS.Pollerd        : running
OpenNMS.PollerBackEnd  : running
OpenNMS.Ticketer       : running
OpenNMS.Collectd       : running
OpenNMS.Threshd        : running
OpenNMS.Discovery      : running
OpenNMS.Vacuumd        : running
OpenNMS.EventTranslator: running
OpenNMS.PassiveStatusd : running
OpenNMS.Statsd         : running
OpenNMS.Importer       : running
OpenNMS.JettyServer    : running
opennms is running

if you are able to see like above your opennms is running without any problems.
If you don't see the above output and get at error asking you to look at a log file.. /var/log/opennms/daemon/output.log and the log file mentions the following error..

An error occurred while attempting to start the "OpenNMS:Name=Dhcpd"

service (class org.opennms.netmgt.dhcpd.jmx.Dhcpd).  Shutting down and exiting.

Edit the file $OPENNMS_HOME/etc/service-configuration.xml and comment out the following portion as follows; and restart the opennms service.

<service>
               <name>OpenNMS:Name=Dhcpd</name>
               <class-name>org.opennms.netmgt.dhcpd.jmx.Dhcpd</class-name>
               <invoke at="start" pass="1" method="start"/>
               <invoke at="status" pass="0" method="status"/>
               <invoke at="stop" pass="0" method="stop"/>
</service>

Finally you can access web UI using the following URL ( replace yourhost to the IP of the opennms server)

http://yourhost:8980/opennms

Configuration of OpenNMS

Login in to the web interface  with  login / pass  admin/admin
Configure Discovery - Select  Home  /  Admin  /  Discovery  / Add New    -- Include Range.
Configure SNMP  - Select Home  / Admin  / Configure SNMP by IP

Database Login Details

opennms/postgres ( test user and password i have given )

Add Alert sound to the OpenNMS webUI

In /usr/share/opennms/jetty-webapps/opennms/includes/servicesdown-box.jsp
Find below tags should be at the end of the file

 
  
<c:otherwise>
  <embed src="tngchime.wav" type="audio/x-pn-realaudio-plugin" hidden="true" autostart="true" loop="false" height="0"  width="0">
  <ul class="plain">
  <c:forEach var="summary" items="${summaries}">
  <c:url var="nodeLink" value="element/node.jsp">
  <c:param name="node" value="${summary.nodeId}"/>
  </c:url>
  <li><a href="${nodeLink}">${summary.nodeLabel}</a> (${summary.fuzzyTimeDown})</li>
  </c:forEach>
  </ul>
  <c:if test="${moreCount > 0}">
  <p class="noBottomMargin" align="right">
  <c:url var="moreLink" value="outage/current.jsp"/>
  <a href="${moreLink}">${moreCount} more...</a>
  </p>
  </c:if>
  </c:otherwise>

The line with the tag is new, the rest is stock
Download the following .wav file and pleace it in /usr/share/opennms/jetty-webapps/

wget http://www.nirvani.net/misc/trek_sounds/tngchime.wav

You don't need to restart OpenNMS to effect
Once you are done with above settings please install QuickTimeInstaller.exe in your windows system and restart the browser if opennms find any outages as soon as you login to OpenNMS webGUI you will hear alert sound ( check your sound volume)

Step by step method to create a SSL certificate for your websites

2011-11-29T12:44:00.001+05:30

cd /etc/apache2/ssl/client

Run following commands

openssl genrsa -des3 -out client.key 1024
openssl req -new -key client.key -out client.crs
openssl ca -in client.crs -cert ../ca/ca.crt -keyfile ../ca/ca.key -out client.crt
openssl pkcs12 -export -clcerts -in client.crt -inkey client.key -out client.p12

Importing Certs in Browser

Make sure to enter the password which was assigned during cert creation.

FireFox

1) Remove your current Certificates.
Firefox : Preferences > Advanced > Encryption > View Certificates > Your Certificates > Select Certificates and Delete.
2) Import : select client.p12 password: test123

Chrome

1) Remove your current Certificates.
Chrome > Preferences > Under the Hood > Manage Certificates > Remove current one..and import the new one.
2) Import select Import : select client.p12 password: test123

How to troubleshoot IP conflicts between Servers / Systems

2011-11-14T16:00:00.001+05:30

when we have ip conflicts between two Systems/Servers and you dont know what server ping is responding. Just give below command it requires nmap to be installed

nmap -sV -O -v ipaddress

From the below i found that the response is coming from Server1.demo.com and more to it we
can also see what operating system it is running and what are the open ports of that server.

root@naresh:/home/cp# nmap -sV -O -v 192.168.1.12

Starting Nmap 5.00 ( http://nmap.org ) at 2011-11-14 15:27 IST
NSE: Loaded 3 scripts for scanning.
Initiating ARP Ping Scan at 15:27

Scanning 192.168.1.12 [1 port]

Completed ARP Ping Scan at 15:27, 0.02s elapsed (1 total hosts)
Initiating Parallel DNS resolution of 1 host. at 15:27
Completed Parallel DNS resolution of 1 host. at 15:27, 0.03s elapsed
Initiating SYN Stealth Scan at 15:27

Scanning 192.168.1.12 [1000 ports]
Discovered open port 3306/tcp on 192.168.1.12
Discovered open port 111/tcp on 192.168.1.12
Discovered open port 80/tcp on 192.168.1.12
Discovered open port 25/tcp on 192.168.1.12
Discovered open port 8080/tcp on 192.168.1.12
Discovered open port 53/tcp on 192.168.1.12
Discovered open port 443/tcp on 192.168.1.12
Discovered open port 8009/tcp on 192.168.1.12
Discovered open port 2049/tcp on 192.168.1.12

Completed SYN Stealth Scan at 15:27, 0.04s elapsed (1000 total ports)
Initiating Service scan at 15:27

Scanning 9 services on 192.168.1.12

Completed Service scan at 15:28, 46.06s elapsed (9 services on 1 host)

Initiating OS detection (try #1) against 192.168.1.12
NSE: Script scanning 192.168.1.12.
NSE: Script Scanning completed.
Host 192.168.1.12 is up (0.000088s latency).
Interesting ports on 192.168.1.12:

Not shown: 991 closed ports
PORT     STATE SERVICE    VERSION
25/tcp   open smtp       Postfix smtpd
53/tcp   open tcpwrapped
80/tcp   open http       Apache httpd 2.2.12 ((Ubuntu))
111/tcp open rpcbind
443/tcp open ssl/http   Apache httpd 2.2.12 ((Ubuntu))
2049/tcp open rpcbind
3306/tcp open mysql      MySQL 5.1.37-1ubuntu5.5
8009/tcp open ajp13?
8080/tcp open http       Apache Tomcat/Coyote JSP engine 1.1
MAC Address: 00:25:90:62:4B:62 (Super Micro Computer)
Device type: general purpose
Running: Linux 2.6.X
OS details: Linux 2.6.24 - 2.6.28
Uptime guess: 0.113 days (since Mon Nov 14 12:45:28 2011)
Network Distance: 1 hop
TCP Sequence Prediction: Difficulty=197 (Good luck!)
IP ID Sequence Generation: All zeros

Service Info: Host: Server1.demo.com

How to get home directory of a prticular user in bash scripting or a single command

2011-09-22T17:23:00.000+05:30

The below command gets the home directory of user if at all the user exists

getent passwd naresh | cut -f6 -d:

Bash script to add some line to a file at specific line number

2011-09-14T16:04:00.001+05:30

I wrote this example to show how to append JAVA_OPTS parameters to startup.sh of tomcat

#!/bin/bash

NLINE=2
s=" export JAVA_OPTS=\"$JAVA_OPTS -Xms1024m -Xmx1024m -XX:MaxPermSize=256m\""
sp=" "
awk -vn="$NLINE" -vs="$s" -vsp="$sp" 'NR==n{$0=$0 sp s}1' startup.sh >temp
mv temp startup.sh

Sp is space given so that if something exists in that line it will give some space and
append our command or string

I just ran 'chmod -x /bin/chmod'. What did I do? How do I recover?

2011-08-21T11:13:00.002+05:30

( or )

What to do if you cannot execute CHMOD?

This is a tricky question.. you have just removed execute permission on chmod.
Result of that is you cannot modify file permissions . Not even for chmod itself .
chmod remains usless on your system.

Here is the solution for the problem

sudo /lib/ld-linux.so.2 /bin/chmod 755 /bin/chmod

or

perl -e 'chmod(0755, "/bin/chmod")'

Solution : Backtrack 5 Live blank screen

2011-08-19T17:36:00.000+05:30

I have downloaded backtrack 5 DVD and was trying to live boot from my Laptop.

Once i am in text mode and as root user.

I gave command startx

Just to turn command mode to GUI mode .

My system was showing a blank screen .. Searched online but did not find solutions

So I have tried my own troubleshooting methods and found that it was Graphics related issue.

Fix : Hope problem is because you are using a laptop with graphic card and BT is not able to
load specific drivers for your graphic card.
So go to BIOS either disable graphic card or

Change Graphic mode from Switching to discrete

for me it worked !! let me know if you still have problems will come up with other solutions...

Rsync current directory using SSH port to remote host

2011-07-20T20:41:00.000+05:30

/usr/bin/rsync -rave "ssh -p 22222 -l root" --delete . 192.168.1.111:/tmp

Bash script to check command-line arguments and set default if not present

2011-07-19T15:31:00.000+05:30

if [ -n "$1" ]
# Test whether command-line argument is present (non-empty).
then
lines=$1
else
lines=$LINES # Default, if not specified on command-line.
fi

HOW TO IMPROVE YOUR LIFE HOW TO IMPROVE YOURSELF

2011-07-14T15:43:00.000+05:30

Personality:
1. Don't compare your life to others'. You have no idea what their journey is all about.
2. Don't have negative thoughts of things you cannot control. Instead invest your energy in the positive present moment
3. Don't over do; keep your limits
4. Don't take yourself so seriously; no one else does
5. Don't waste your precious energy on gossip
6. Dream more while you are awake
7. Envy is a waste of time. You already have all you need..
8. Forget issues of the past. Don't remind your partner of his/her mistakes of the past. That will ruin your present happiness.
9. Life is too short to waste time hating anyone. Don't hate others.
10. Make peace with your past so it won't spoil the present
11. No one is in charge of your happiness except you
12. Realize that life is a school and you are here to learn.
Problems are simply part of the curriculum that appear and fade away like algebra class but the lessons you learn will last a lifetime.
13. Smile and laugh more
14. You don't have to win every argument. Agree to disagree.

Community:
15. Call your family often
16. Each day give something good to others
17. Forgive everyone for everything
18. Spend time with people over the age of 70 & under the age of 6
19. Try to make at least three people smile each day
20. What other people think of you is none of your business
21. Your job will not take care of you when you are sick. Your family and friends will. Stay in touch.

Life:
22. Put GOD first in anything and everything that you think, say and do.
23. GOD heals everything
24. Do the right things
25. However good or bad a situation is, it will change
26. No matter how you feel, get up, dress up and show up
27. The best is yet to come
28. Get rid of anything that isn't useful, beautiful or joyful
29. When you awake alive in the morning, thank GOD for it
30. If you know GOD you will always be happy. So, be happy.

While you practice all of the above, share this knowledge with the people you love, people you school with,
people you play with, people you work with and people you live with.
Not only will it enrich YOUR life, but also that of those around you

how to encrypt your scripts using sch

2011-07-06T18:15:00.000+05:30

Dont want to give your scripts to any one but want to give someone to execute for specific period of time then this is what you are looking for .
We can also give timeline in which the script can be used.

Also you will not be revealing you passwords in the script.

SCH will encrypt shell scripts using RC4 and make executable binary.

http://www.datsi.fi.upm.es/~frosal/sources/shc-3.8.7.tgz

shc [ -e date ] [ -m addr ] [ -i iopt ] [ -x cmnd ]
[ -l lopt ] [ -ACDhTv ] -f script

shc -e date ( script will not run afterdate specified )
-m "Please contact support " (message to display after we run the expired scirpt)

shc -e 01/06/2010 -m "You are late to run this script." -f script.sh

./script.sh.x

http://www.datsi.fi.upm.es/~frosal/sources/shc.html

I have tried to hack the encrypted binary that came as output, but was not successful
I used bashdb and GDB

Per user mac based bandwidth monitor for routers

2011-06-27T13:26:00.001+05:30

Want to calculate how much bandwidth each user (mac address) is using

./wrtbwmon setup
./wrtbwmon update /tmp/usage.db offpeak
./wrtbwmon publish /tmp/usage.db /www/user/usage.htm /jffs/users.txt

Here is open source solution ClickHere

Below is the script (wrtbwmon )

---------------------------

LAN_IFACE=$(nvram get lan_ifname)

lock()

{

while [ -f /tmp/wrtbwmon.lock ]; do

if [ ! -d /proc/$(cat /tmp/wrtbwmon.lock) ]; then

echo "WARNING : Lockfile detected but process $(cat /tmp/wrtbwmon.lock) does not exist !"

rm -f /tmp/wrtbwmon.lock

sleep 1

done

echo $$ > /tmp/wrtbwmon.lock

}

unlock()

{

rm -f /tmp/wrtbwmon.lock

}

case ${1} in

"setup" )

#Create the RRDIPT CHAIN (it doesn't matter if it already exists).

iptables -N RRDIPT 2> /dev/null

#Add the RRDIPT CHAIN to the FORWARD chain (if non existing).

iptables -L FORWARD --line-numbers -n | grep "RRDIPT" | grep "1" > /dev/null

if [ $? -ne 0 ]; then

iptables -L FORWARD -n | grep "RRDIPT" > /dev/null

if [ $? -eq 0 ]; then

echo "DEBUG : iptables chain misplaced, recreating it..."

iptables -D FORWARD -j RRDIPT

iptables -I FORWARD -j RRDIPT

#For each host in the ARP table

grep ${LAN_IFACE} /proc/net/arp | while read IP TYPE FLAGS MAC MASK IFACE

#Add iptable rules (if non existing).

iptables -nL RRDIPT | grep "${IP} " > /dev/null

if [ $? -ne 0 ]; then

iptables -I RRDIPT -d ${IP} -j RETURN

iptables -I RRDIPT -s ${IP} -j RETURN

done

;;

"update" )

[ -z "${2}" ] && echo "ERROR : Missing argument 2" && exit 1

# Uncomment this line if you want to abort if database not found

# [ -f "${2}" ] || exit 1

lock

#Read and reset counters

iptables -L RRDIPT -vnxZ -t filter > /tmp/traffic_$$.tmp

grep -v "0x0" /proc/net/arp | while read IP TYPE FLAGS MAC MASK IFACE

#Add new data to the graph. Count in Kbs to deal with 16 bits signed values (up to 2G only)

#Have to use temporary files because of crappy busybox shell

grep ${IP} /tmp/traffic_$$.tmp | while read PKTS BYTES TARGET PROT OPT IFIN IFOUT SRC DST

[ "${DST}" = "${IP}" ] && echo $((${BYTES}/1000)) > /tmp/in_$$.tmp

[ "${SRC}" = "${IP}" ] && echo $((${BYTES}/1000)) > /tmp/out_$$.tmp

done

IN=$(cat /tmp/in_$$.tmp)

OUT=$(cat /tmp/out_$$.tmp)

rm -f /tmp/in_$$.tmp

rm -f /tmp/out_$$.tmp

if [ ${IN} -gt 0 -o ${OUT} -gt 0 ]; then

echo "DEBUG : New traffic for ${MAC} since last update : ${IN}k:${OUT}k"

LINE=$(grep ${MAC} ${2})

if [ -z "${LINE}" ]; then

echo "DEBUG : ${MAC} is a new host !"

PEAKUSAGE_IN=0

PEAKUSAGE_OUT=0

OFFPEAKUSAGE_IN=0

OFFPEAKUSAGE_OUT=0

else

PEAKUSAGE_IN=$(echo ${LINE} | cut -f2 -s -d, )

PEAKUSAGE_OUT=$(echo ${LINE} | cut -f3 -s -d, )

OFFPEAKUSAGE_IN=$(echo ${LINE} | cut -f4 -s -d, )

OFFPEAKUSAGE_OUT=$(echo ${LINE} | cut -f5 -s -d, )

if [ "${3}" = "offpeak" ]; then

OFFPEAKUSAGE_IN=$((${OFFPEAKUSAGE_IN}+${IN}))

OFFPEAKUSAGE_OUT=$((${OFFPEAKUSAGE_OUT}+${OUT}))

else

PEAKUSAGE_IN=$((${PEAKUSAGE_IN}+${IN}))

PEAKUSAGE_OUT=$((${PEAKUSAGE_OUT}+${OUT}))

grep -v "${MAC}" ${2} > /tmp/db_$$.tmp

mv /tmp/db_$$.tmp ${2}

echo ${MAC},${PEAKUSAGE_IN},${PEAKUSAGE_OUT},${OFFPEAKUSAGE_IN},${OFFPEAKUSAGE_OUT},$(date "+%d-%m-%Y %H:%M") >> ${2}

done

#Free some memory

rm -f /tmp/*_$$.tmp

unlock

;;

"publish" )

[ -z "${2}" ] && echo "ERROR : Missing argument 2" && exit 1

[ -z "${3}" ] && echo "ERROR : Missing argument 3" && exit 1

USERSFILE="/etc/dnsmasq.conf"

[ -f "${USERSFILE}" ] || USERSFILE="/tmp/dnsmasq.conf"

[ -z "${4}" ] || USERSFILE=${4}

[ -f "${USERSFILE}" ] || USERSFILE="/dev/null"

# first do some number crunching - rewrite the database so that it is sorted

lock

touch /tmp/sorted_$$.tmp

cat ${2} | while IFS=, read MAC PEAKUSAGE_IN PEAKUSAGE_OUT OFFPEAKUSAGE_IN OFFPEAKUSAGE_OUT LASTSEEN

echo ${PEAKUSAGE_IN},${PEAKUSAGE_OUT},${OFFPEAKUSAGE_IN},${OFFPEAKUSAGE_OUT},${MAC},${LASTSEEN} >> /tmp/sorted_$$.tmp

done

unlock

# create HTML page

echo "Traffic

Total Usage :

" >> ${3}

echo "" >> ${3}

echo "

User	Peak download	Peak upload	Offpeak download	Offpeak upload	Last seen

" >> ${3}

echo "
This page was generated on `date`" 2>&1 >> ${3}

echo "" >> ${3}

#Free some memory

rm -f /tmp/*_$$.tmp

;;

echo "Usage : $0 {setup|update|publish} [options...]"

echo "Options : "

echo " $0 setup"

echo " $0 update database_file [offpeak]"

echo " $0 publish database_file path_of_html_report [user_file]"

echo "Examples : "

echo " $0 setup"

echo " $0 update /tmp/usage.db offpeak"

echo " $0 publish /tmp/usage.db /www/user/usage.htm /jffs/users.txt"

echo "Note : [user_file] is an optional file to match users with their MAC address"

echo " Its format is : 00:MA:CA:DD:RE:SS,username , with one entry per line"

exit

;;

esac

How to extract 7zip files in ubuntu

2011-06-16T17:09:00.000+05:30

First install 7zip package

sudo apt-get install p7zip

( you will need universal repository to run the above command )

after installing

7z x my7Zzipfile

Script to check weather user is root or not

2011-05-30T17:30:00.002+05:30

if [ "$UID" -ne "$ROOT_UID" ]
then
echo "Must be root to run this script."
exit $E_NOTROOT
fi

Script to check weather user is root or not

2011-05-30T17:29:00.001+05:30

if [ "$UID" -ne "$ROOT_UID" ]
then
echo "Must be root to run this script."
exit $E_NOTROOT
fi

How to Restore Vyatta grub

2011-05-19T18:57:00.001+05:30

grub> linux /boot/vmlinuz root=/dev/sda1

grub> initrd /boot/initrd

grub> boot

once we boot OS using this commands, We have to re-install grub to make it perminant

grub-install /dev/sda

will install grub now just reboot and relax !!

Make a Deal fraud in Hyderabad Victim's Society, In orbit mall city center

2011-05-06T16:17:00.005+05:30

Hi all,
ha ha... laughing seeing the title Victim's society......

I am one of the victim of "make a deal" fraud done in hyderabad ( lost 50K)
My name is Naresh
Contact no : 9000608609

this fraud happened in "In-Orbit" and "City Center" Malls in Hyderabad.

Here is what happened..
Stalls were setup in these malls attracting customers to pay Rs 50 and get gift vouchers/mobile recharge worth Rs 250, immediately.
Customers were promised to get Reebok vouchers to be mailed to their address.
The caveat however is the customer has to use his/her "Debit Card" to make initial Rs 50 payment.
As soon as the card is swiped and pin entered the details were captured, i believe in the card swipe machine.
After a few days when salaries were credited to the account, these fraudsters had cleaned the account.
I heard of customers who were happy getting Baskin Robins vouchers immediately, and these "satisfied customers" informed friends and family to avail this amazing "Make a deal" offer.

Lets all fight in common.....Lets join our hands

I posted this to unite all victims so that we can fight back !!!

Feel free to contact me and join in group

Police told we will be gathered to record a statement...Don't know how far police will help us.

Lessons we learnt:
--------------------------------

1) Use credit cards, We have time to block the transaction if it is Unauthorized
2) Don't reveal Debit Card pins even to your friends.
3) Don't use Debit card of your salary account anywhere. ( Transaction done once salary got credited)
Maintain alternative Debit cards with small amounts
4) Frequently change ATM pins, account passwords.

News about this scam on DC
-----------------------------------------

How to add apache user to SVN repository ?

2011-05-04T19:54:00.000+05:30

Add user and password

htpasswd -m /etc/apache2/dav_svn.passwd username1

Add entry for that user in the following file

vi /etc/apache2/dav_svn.authz

Fastest way of transferring files between 2 server's over network

2011-04-25T13:22:00.000+05:30

Below are file transfer tips from the geek..

Fastest way of transferring files between 2 server's over network

-- SCP : (20MB/sec)
-- FTP : requires ftp installed id/password : 40MB/sec
-- NetCAT : might work if netcat is installed. : 60MB/sec

   source : tar -cvzf /dir/ |netcat -l 7777
   client : netcat source_ip:7777 |tar -xvzf path
-- Using Python / WGet : Ninja Master : 80MB/sec

Server:
# cd $folder_have the file
# Start python webserver with this command.
python -m SimpleHTTPServer
Client :
wget -c http://x.x.x.239:8000/$file

-c will recover from a file break if something broke half way.

Iptables Port forwarding for VNC

2011-04-18T17:53:00.000+05:30

 
 /sbin/iptables -A PREROUTING -t nat -p tcp -d $NATIP --dport 5900 -m 
state --state NEW,ESTABLISHED,RELATED -j DNAT --to 192.168.0.2:5900

Monitor your Boot Sequence with Bootchart

2011-04-18T17:35:00.002+05:30

Ubuntu – Monitor your Boot Sequence with Bootchart

About Bootchart
Bootchart is a tool used to analyse your system performance in linux boot process.
It process all the required information accumulated during the boot process
(CPU usage and disk usage) which will then display as PNG, SVG, EPS encoded chart.
First of all you will have to Install Bootchart on Ubuntu.

Installation

sudo aptitude install bootchart
Reboot your PC

When you restart your computer Bootchart will create a graphical illustration in .png format.
Disabling and Enabling Bootchart
To disable Bootchart just use these code:

cd /etc/init.d

sudo update-rc.d -f stop-bootchart remove

Removing any system startup links for /etc/init.d/stop-bootchart

   /etc/rc2.d/S99stop-bootchart
   /etc/rc3.d/S99stop-bootchart
   /etc/rc4.d/S99stop-bootchart
   /etc/rc5.d/S99stop-bootchart

And to re-enable just use these codes:

cd /etc/init.d

sudo update-rc.d stop-bootchart start 99 2 3 4 5 .

Adding system startup for /etc/init.d/stop-bootchart ...

   /etc/rc2.d/S99stop-bootchart -> ../init.d/stop-bootchart
   /etc/rc3.d/S99stop-bootchart -> ../init.d/stop-bootchart
   /etc/rc4.d/S99stop-bootchart -> ../init.d/stop-bootchart
   /etc/rc5.d/S99stop-bootchart -> ../init.d/stop-bootchart

Common Scripting errors for beginners

2011-04-11T12:17:00.000+05:30

when i started scripting i had these errors in the begenning . The most common mistakes one makes during his initial stages of scripting are.

1.Check script file permissions. A script needs execute permission

2.We should not use default values that generate errors.If you
give those your script execution breaks in the middle.

3.We must supply parameters as required ie make parameter mandatory
if parameter is to be provided for sure, or else it throws an error.

4. Resuable script should not be hard-coded values.Use parameters instead.

5.Commenting the script is very important... Make it a habbit to write
comments.Also specify in comments if script has multiple parameters.
you can also write examples in comments for better understanding.

6. Error handling is a must for scripting

what is Citrix presentation server ?

2011-04-07T23:45:00.000+05:30

Citrix presentation server uses ICA protocol

allow to remotely access individual application.

It appears on the task-bar so we can toggle around the screens.

Adds management infrastructure ( allow more sessions on to server)

ability to start applications from a web site