Check two network devices attach properly or not.
Follow the steps to configure the Linux machine(CentOS, Fedora) gateway.
i ) Check the Device eth0, eth1 are available on the machine by running command.
[root@Xhost ]# ifconfig
It will display eth0 and eth1 two network card details (ip, mac and etc).
ii)...
Monday, 24 December 2012
Friday, 21 December 2012
Guide to Install VServer in Fedora and Install MYPLC in VServer
This Guide will explain how to install Vserver in Fedora and then How to Install MyPLC in Vserver
Step 1 : Install Fedora 12 without GUI (do not Install Any X11 packages Because in GUI mode vserver not Installing Properly)
Option 1 :
Download Fedora Net Install ISO and Install while Installing Choose Minimal as...
Tuesday, 18 December 2012
Uninstall or Remove Any Application or Package in Fedora
Hi I already installed yum-3.2.28-5.fc12.noarch package now i want to remove that package and
Install lower version yum-3.2.25-2chroot.noarch
[root@server1]#rpm -Uvh yum-3.2.25-2chroot.noarch.rpm
Preparing... ########################################### [100%]
...
Thursday, 13 December 2012
Find Size of table and Size of Index in MySQL Command Prompt
To find Size of table in MySQL command prompt use below command
mysql > SELECT table_name AS "Table", round(((data_length + index_length) / 1024 / 1024), 2) "Size in MB" FROM information_schema.TABLES WHERE table_schema = "database_name" AND table_name = "table_name";
To find Size of Index of a table in MySQL command...
Thursday, 6 December 2012
Add new Line while Appending two files in Linux
If two files containing following content
file1:
1
2
file2:
3
4
After append : cat file2>>file1
output in file1:
1
23
4
to Add new Line while Appending two files
Command : sed -i -e '$a\' file2 | cat file2 >> file1
From Above
sed -i -e '$a\' file2
This adds \n at the end of the file only if...
Wednesday, 28 November 2012
Solution: After Exception Catch in Python What will happen?
Exception Handling :
After Exception Catch Python will execute remaining code, See below Example
#!/usr/bin/python3
# reading sitemap xml file
#
a=5
def diverror(a):
a = a/0
print(a)
try:
diverror(a)
except:
print("Division Error")
a = a+10
print(a)
Output:
Division Error
15
...
Break out of the function in Python
In Python if Any function return any thing or return none means the function is completed ie Break out of the function
Example:
def test(a,b):
return "HI Closed"
a = b+10
print(a)
test(10,11)
output:
HI Close...
Catch all exception in Python3
to catch all exceptions in python3 simple do like bellow
try:
code
except:
print("Unknown Exception found"...
Sunday, 25 November 2012
Python current timestamp
To get current time with date in python
from datetime import datetime
curtime = str(datetime.now())
output : '2012-11-25 14:58:30.465213'
...
Friday, 23 November 2012
Solution: Extract tar.bz2 files in Linux
To Extract tar.bz2 files in linux use below command
root@system1~# tar -xjvf filename.tar.b...
Wednesday, 21 November 2012
Delete duplicate rows in mysql table
It is Possible to DELETE duplicate rows in MYSQL table based on Particular Field (Coloumn)
the SQL Query is
ALTER IGNORE TABLE table_name ADD UNIQUE INDEX(coloumn_name);&nbs...
Thursday, 15 November 2012
IPtables: Saving firewall rules to /etc/sysconfig/iptables: /etc/init.d/iptables: line 268: restorecon: command not found
Solution to : IPtables: Saving firewall rules to /etc/sysconfig/iptables: /etc/init.d/iptables: line 268: restorecon: command not found
root@server1:~# ls -l /sbin/ | grep restore
lrwxrwxrwx 1 root root 14 May 23 17:52 iptables-restore -> iptables-multi
Means policycoreutils not Installed
So Install policycoreutils...
Tuesday, 13 November 2012
Read Large Files Line by Line in Python - Best Way
The readlines() function loads the entire file into memory as it runs. A better approach for large files is to use the fileinput module, as follows:import fileinputfor line in fileinput.input(['myfile']): print(lin...
Monday, 12 November 2012
Solution: Dovecot error : Unknown database driver mysql
Dovecot error : Unknown database driver mysql because Dovecot requires the dovecot-mysql package to run mysql authentication. So Install dovecot-mysql
yum install dovecot-mysq...
Friday, 9 November 2012
Load Kernel Module in Linux Example Load IP table module
Below Instructions shows How to Load Kernel module in Linux
check whether module is Loaded or Not
if you don't know Exact Module Name then Check All Loaded Modules
root@system1:~# lsmod
Module Size Used by
nf_conntrack_ipv4 18850...
Tuesday, 6 November 2012
Solution to g++: Command not found in Fedora Problem
g++ command not found means gcc-c++ package not
installed so install gcc-c++ package
command
root@system1:# yum install gcc-c...
Install deb packages
To install .deb packages use following command
root@system1:~# dpkg -i package.d...
SSH login without password in Linux
Hi to login into Linux System through SSH with out password Follow Below Steps
two systems (Below IP addresses are for Example)
system1 ip : 2.2.2.2
system2 ip : 3.3.3.3
Note: For Below Command don't type any thing Simply press Enter
root@system1:~# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in...
Monday, 5 November 2012
convert to binary in PHP
In PHP decbin function is used to convert anything to binary
Example:
<?php
$a = "3";
$b = 4;
echo decbin($a)."<br>";
echo decbin($b);
?>
Output:
11
1...
Monday, 22 October 2012
Setup domain nagix etc usefull urls
http://www.unixsurgeon.com/kb/setup-nginx-as-reverse-proxy-with-apache.html
http://kbeezie.com/view/apache-with-nginx/
http://www.ctkn.net/2011/10/install-mod_rpaf-on-centos-5-centos-6/
http://www.unixsurgeon.com/kb/setup-nginx-as-reverse-proxy-with-apache.html
http://www.beer.org.uk/bsacdns/
http://www.webtop.com.au/blog/how-to-setup-dns-using-webmin-2009052848
http://forums.devshed.com/dns-36/setting-up-dns-using-webmin-406190.html...
Change linux root password
Change linux root password
user# su
password :
root# passwd
Enter New Password:
Re type password:
&nbs...
After Copying Mysql table data files manually mysql service not running
If you got the problem After Copying Mysql table data files manually MySQL service not running then check owner of copied files, to work MySQL the owner must be MySQL
mysql data folder in linux /var/lib/mysql
root/backup# cp databasefolder /var/lib/mysql
root# chown mysql.mysql databasefolder
root# cd databasefolder
root/databasefolder#...
Sunday, 21 October 2012
Solution to : XML::SAX::Base.3pm.gz conflicts between Problem
Some time if you got Problem like below while yum update
file /usr/share/man/man3/XML::SAX::Base.3pm.gz conflicts between attempted installs of perl-XML-SAX-Base-1.04-3.el6.noarch and perl-XML-SAX-0.96-7.el6.noarch file /usr/share/man/man3/XML::SAX::Exception.3pm.gz conflicts between attempted installs of perl-XML-SAX-Base-1.04-3.el6.noarch...
Solution to : Error: rpmdb open failed
Error: rpmdb open failed will occur while trying to use you update to solve this problem use following commands
yum clean all
rm -f /var/lib/rpm/__db*
rpm --rebuilddb
yum upda...
Thursday, 18 October 2012
Shell script execute command and store in variable
This Post shows how to execute command in .sh files ie shell script files
Example:
cmd=$(ps -ef | grep tcpdump | awk '{print $3}')
echo $cmd
in .sh files need to use like this variable=$(comman...
Wednesday, 17 October 2012
Set PHP execution time in Code Itself
It is possible to Set PHP execution time in code No need to changing php.ini file
Add Below line to your PHP code
ini_set('max_execution_time', 1919);
where 1919 means PHP script will execute 1919 seconds
Example:
<?php
ini_set('max_execution_time', 1919);
.................
................
..............
?>...
Tuesday, 9 October 2012
Get SVN files and Folders with WGET
By Using WGET it is possible to get all files and folders of a url
Command
wget -r -i http://svn.planet-lab.org/svn/build/trun...
Wednesday, 3 October 2012
Add Route Between Two Systems
Type ifconfig in terminal (command Prompt) to know IP
Type route -n in terminal (command Prompt) to know GateWay
First System IP : 203.41.55.23
Second System IP : 23.41.67.89
First System Gateway : 203.41.55.1
Second System Gateway : 23.41.67.1
You can add route in any One System is Enough for example
Add route in First...
Saturday, 29 September 2012
Show error message if Java run-time not installed in client mechine through JavaScript
By using Follow code, it is possible to show error message if java run-time not installed in client mechine
<!DOCTYPE html><html><body><script>if (navigator.javaEnabled()) { //Java is enabled}else{document.write("Error:Java is Disabled or Java Not Installed<br>Download and Insatall...
Wednesday, 26 September 2012
Solution SSH Connection Refused Problem in Linux - Backtrack
If your system unable to SSH from another System means
1. SSH server Not Running. So start SSH Server
To start SSH server goto Applications->Backtrack->Services->SSHD->sshd start
If It is Running, and unable to SSH...
Monday, 24 September 2012
Solution to Endianness Problems in Linux Networking
There are two types of Endians
1.Big-Endian
2.Little-Endian
In real world Networks generally use Big-Endian
Ethernet is Big-endian
IP's byte order also is Big-endian
A common solution to the endianness problem associated with networking can be handled by below functions
htons(): Convert 16-bit unsigned value from...
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