sudo permission to the normal user

how to give sudo permission for normal user
#visudo

in the configuration file just just change this
#Same thing without a password
# %wheel ALL=(ALL)  NOPASSWD:ALL
 dbuser    ALL=(ALL) NOPASSWD: ALL
:wq!
save and quit

here we have given sudo permission for the normal user
by this normal user has given permission as sudo

installation of dhcp server in centos6

Installation of DHCP in centos6

first install the dhcp packages in your system
#yum install dhcpd
After installing copy the dhcpd.conf.sample from the desired loaction
#cp /usr/share/doc/dhcp*/dhcpd.conf.sample /etc/dhcpd/dhcpd.conf
Then after this go to dhcpd.conf file
#vim /etc/dhcpd/dhcpd.conf
here it is shown how i edited iam setting the dhcp server ip address as 192.168.1.177 static
# dhcpd.conf
#
# Sample configuration file for ISC dhcpd
#
# option definitions common to all supported networks...
option domain-name "varna.com";
option domain-name-servers 202.65.156.11, 188.18.135.5;
default-lease-time 600;
max-lease-time 7200;
# Use this to enble / disable dynamic dns updates globally.
#ddns-update-style none;
# If this DHCP server is the official DHCP server for the local
# network, the authoritative directive should be uncommented.
#authoritative;
# Use this to send dhcp log messages to a different log file (you also
# have to hack syslog.conf to complete the redirection).
log-facility local7;
# No service will be given on this subnet, but declaring it helps the
# DHCP server to understand the network topology.
subnet 192.168.1.0 netmask 255.255.255.0 {
}
# This is a very basic subnet declaration.
subnet 192.168.1.0 netmask 255.255.255.0 {
range 192.168.1.50 192.168.1.250;
option routers 192.168.1.4;
}
# This declaration allows BOOTP clients to get dynamic addresses,
# which we don't really recommend.
#subnet 10.254.239.32 netmask 255.255.255.224 {
# range dynamic-bootp 10.254.239.40 10.254.239.60;
# option broadcast-address 10.254.239.31;
# option routers rtr-239-32-1.example.org;
#}
# A slightly different configuration for an internal subnet.
#subnet 10.5.5.0 netmask 255.255.255.224 {# range 10.5.5.26 10.5.5.30;
# option domain-name-servers ns1.internal.example.org;
# option domain-name "internal.example.org";
# option routers 10.5.5.1;
# option broadcast-address 10.5.5.31;
# default-lease-time 600;
# max-lease-time 7200;
#}
# Hosts which require special configuration options can be listed in
# host statements. If no address is specified, the address will be
# allocated dynamically (if possible), but the host-specific information
# will still come from the host declaration.
#host passacaglia {
# hardware ethernet 0:0:c0:5d:bd:95;
# filename "vmunix.passacaglia";
# server-name "toccata.fugue.com";
#}
# Fixed IP addresses can also be specified for hosts. These addresses
# should not also be listed as being available for dynamic assignment.
# Hosts for which fixed IP addresses have been specified can boot using
# BOOTP or DHCP. Hosts for which no fixed address is specified can only
# be booted with DHCP, unless there is an address range on the subnet
# to which a BOOTP client is connected which has the dynamic-bootp flag
# set.
#host fantasia {
# hardware ethernet 08:00:07:26:c0:a5;
# fixed-address fantasia.fugue.com;
#}
# You can declare a class of clients and then do address allocation
# based on that. The example below shows a case where all clients
# in a certain class get addresses on the 10.17.224/24 subnet, and all
# other clients get addresses on the 10.0.29/24 subnet.
#class "foo" {
# match if substring (option vendor-class-identifier, 0, 4) = "SUNW";
#}
#shared-network 224-29 {
# subnet 10.17.224.0 netmask 255.255.255.0 {
# option routers rtr-224.example.org;
# }
# subnet 10.0.29.0 netmask 255.255.255.0 {
# option routers rtr-29.example.org;
## }
# pool {
# allow members of "foo";
# range 10.17.224.10 10.17.224.250;
# }
# pool {
# deny members of "foo";
# range 10.0.29.10 10.0.29.230;
# }

Then save the file

After this start the dhcp service
#service dhcpd start

to start the service when were the system starts
#chkconfig dhcpd on

then check in other system by disconnecting and again coonect to internet
then you will see new dhcp server

What is virtualization?

What is virtualization ?

Virtualization is nothing but creating a virtual which doesn’t have any physical parts such as desktop, cpu, hardisk i.e; we don’t have any physical maintance . By using virtualization we can build different operating systems as images . difference between normal and virtualization set up.

Here above shown set up for the normal and virtualization. But in virtualization we can run mutilple o.s (operating systems) in a single setup which will reduce the cost of the hardware and maintance

How to install nagios in ubuntu

How to install nagios in ubuntu

Nagios: Nagios is an open source application that monitors for computer network problems so that they can be fixed more quickly. Nagios was designed for use with the linux operating system, but it will also work under unix and most Unix-based systems. It is difficult to understand but very good tools to monitor the network and servers

#apt-get install apache2

#apt-get install libapache2-mob-php5

#apt-get install build-essentail

#apt-get install libgd2-xpm-dev

here create a user named nagios

#useradd -m -s /bin/bash nagios

#passwd nagios

#/usr/sbin/groupadd nagcmd

#/usr/sbin/usermod -a -G nagcmd nagios
#/usr/sbin/usermod -a -G nagcmd www-data

After this download the nagios from the nagios site

#wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.2.3.tar.gz

#wget http://prdownloads.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.11.tar.gz
#ls
#tar xvf nagios-3.2.3.tar.gz
#cd nagios-3.2.3
#./configure –with-command-group=nagcmd
#make all
#make install
#make install init
#make install-config
#make install-commandmode
here we will edit a file and palce the emailid of ours
#vi /usr/local/nagios/etc/objects/contacts.cfg
here we will install nagios web config with apache
#make install-webconf
create a nagios login password
#htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
here restart the apache
#ls
tar xvf nagios-plugins-1.4.11.tar.gz
#cd nagios-plugins-1.4.11
#./configure –with-nagios-user=nagios –with-nagios-group=nagios
#make
#make install 
#ln -s /etc/init.d/nagios /etc/rcS.d/S99nagios

#/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

here we will restart the nagios

#/etc/init.d/nagios restart

after this go to browser and type http://localhost/nagios

username: nagiosadmin

password: which u given?

for more details click here

cacti installation in ubuntu

About Cacti
Cacti is a complete network graphing solution designed to harness the power of RRDTool's data storage and graphing functionality. Cacti provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features out of the box. All of this is wrapped in an intuitive, easy to use interface that makes sense for LAN-sized installations up to complex networks with hundreds of device
here we will show how we will install cacti in ubuntu

#apt-get install php5 php5-gd php5-mysql
after this install the cacti in ubuntu

#apt-get install cacti-spine
here the screen shots for the cacti installation is shown below

 

mysql password for the root user should be given

here repeat the mysql password

Configuring libphp-adodb in ubuntu

here we will select apache2 for the configuration of cacti

select yes for installation of cacti database packages in ubuntu

create a password for the database admin of cacti

reconfirm the password

then go to the browser and type http://localhost/cacti then it will be promting for the installation of the cacti

then install cacti installtion guide

then after this a login page will be created for the cacti

username: cacti
passwd: admin
reconfirm passwd: admin
after login to the page you can change the cacti password

after this the installation procedure for cacti is been shown with this u can monitor your local host and graphs of the loads
for more information login here

How to install aptana in ubuntu 10.10

How to install aptana in ubuntu 10.10

installation of aptana version 3 is shown here

#sudo add-apt-repository ppa:ferramroberto/java
#sudo apt-get update
#sudo apt-get install sun-java6-jdk sun-java6-plugin

Download & install xulrunner for ubuntu 10.10

#wget -O xulrunner.deb http://launchpadlibrarian.net/70321863/xulrunner-1.9.2_1.9.2.17%2Bbuild3%2Bnobinonly-0ubuntu1_i386.deb

#sudo dpkg -i xulrunner.deb

Download and install aptana from here

#sudo unzip [name of Aptana Studio ZIP file here].zip -d /opt
#sudo mv /opt/Aptana\ Studio\ 3 /opt/aptana-studio-3

to get the desktop icon

#wget http://www.samclarke.com/wp-content/uploads/2011/11/AptanaStudio.desktop
#sudo mv AptanaStudio.desktop /usr/share/applications/AptanaStudio.desktop

how to create a aptana launcher in ubuntu 



just right click then on create launcher


afterthis give the launcher name


and the path of the launcher /opt/aptana-studio-3/AptanaStudio3


then a launcher for aptana will be created on the Desktop

here the aptana will be install in ubuntu 10.10 

how to install aptana in ubuntu on 12.04

How to install aptana studio in ubuntu 12.04

install the required packages 
#sudo apt-get install openjdk-7-jdk libjpeg62 libwebkitgtk-1.0-0 git-core

#sudo apt-get install libjpeg62 libwebkitgtk-1.0-0 git-core
#sudo add-apt-repository ppa:webupd8team/java
#sudo apt-get update
#sudo apt-get install oracle-java7-installer

after this download the aptana studio from here

after downloading extract the file to /opt

#sudo unzip [Aptana Studio ZIP file here].zip -d /opt

#wget http://www.samclarke.com/wp-content/uploads/2012/04/AptanaStudio3.desktop

#sudo mv AptanaStudio3.desktop /usr/share/applications/AptanaStudio3.desktop

after this aptana will be installaed in your system

how to create a aptana launcher in ubuntu

just right click then on create launcher

after this give the launcher name

and the path of the launcher /opt/aptana-studio-3/AptanaStudio3

then a launcher for aptana will be created on the Desktop

after installing go the the file > new > here create a new project wheather php, ruby etc,
if already existing project means create a project name with some xyz after this go to file > import here you can import alreday existing project in it

for any reference go through here