Restoring Default Ubuntu Panel

This is for the newbies in the Ubuntu Community. Sometimes we want to configure our panels on Ubuntu to give a nicer look. And the newbies often fail to do that as they want and may want to restore the default panel settings. Restoring the default panel setting on Ubuntu is pretty simple. Just run the following command in the terminal and you will get your default Ubuntu panels back.

sudo debconf gnome-panel

But this is not a permanent solution. To permanently enable your default panel configuration enter the following commands in the terminal sequentially.

gconftool –recursive-unset /apps/panel
rm -rf ~/.gconf/apps/panel
pkill gnome-panel

Enjoy!!

N.B. Don’t worry if any of the command removes all your panel. The next command will restore it to default configuration.

Installing Apache Tomcat 6 on Ubuntu (8.04 / 8.10)

Before we install Tomcat you’ll need to make sure that whether we already have installed Java. Let’s assume that we are trying to install Tomcat we’ve already installed java, but if we aren’t sure we can check with the dpkg command like so:

dpkg –get-selections | grep sun-java

This should give we this output if we already installed java:

sun-java6-bin                                   install
sun-java6-jdk                                   install
sun-java6-jre                                   install

If that command has no results, we’ll want to install the latest version with this command:

sudo apt-get install sun-java6-jdk

Installation

Now we’ll download and extract Tomcat from the apache site. We should check to make sure there’s not another version and adjust accordingly.

wget http://apache.host.com/tomcat/tomcat-6/v6.0.14/bin/apache-tomcat-6.0.14.tar.gz

tar xvzf apache-tomcat-6.0.14.tar.gz

The best thing to do is move the tomcat folder to a permanent location. I chose /usr/local/tomcat.

sudo mv apache-tomcat-6.0.14 /usr/local/tomcat

Tomcat requires setting the JAVA_HOME variable. The best way to do this is to set it in the .bashrc file.

The better method is editing the .bashrc file and adding the bolded line there. We’ll have to logout of the shell for the change to take effect.

vi ~/.bashrc

Add the following line:

export JAVA_HOME=/usr/lib/jvm/java-6-sun

At this point we can start tomcat by just executing the startup.sh script in the tomcat/bin folder.

Automatic Starting

To make tomcat automatically start when we boot up the computer, we can add a script to make it auto-start and shutdown.

sudo vi /etc/init.d/tomcat

Now paste in the following:

# Tomcat auto-start
#
# description: Auto-starts tomcat
# processname: tomcat
# pidfile: /var/run/tomcat.pid

export JAVA_HOME=/usr/lib/jvm/java-6-sun

case $1 in
start)
sh /usr/local/tomcat/bin/startup.sh
;;
stop)
sh /usr/local/tomcat/bin/shutdown.sh
;;
restart)
sh /usr/local/tomcat/bin/shutdown.sh
sh /usr/local/tomcat/bin/startup.sh
;;
esac
exit 0

We’ll need to make the script executable by running the chmod command:

sudo chmod 755 /etc/init.d/tomcat

The last step is actually linking this script to the startup folders with a symbolic link. Execute these two commands and we should be on our way.

sudo ln -s /etc/init.d/tomcat /etc/rc1.d/K99tomcat
sudo ln -s /etc/init.d/tomcat /etc/rc2.d/S99tomcat

Tomcat should now be fully installed and operational. Cheers!

Thanks

How to Install LAMP (Linux, Apache, MySQL, PHP) on Ubuntu (8.04 / 8.10)

This is for the newbies in the world of Ubuntu. Use the following steps to install LAMP (Linux, Apache, MySQL and PHP) in Ubuntu.

• Open up the Terminal (Applications > Accessories > Terminal).
• Run the following command to install Apache
  

  $sudo apt-get install apache2

• To test Apache open up any web browser and then enter the following into the web address:
  

  http://localhost/

• Now run the following command in the terminal to install PHP
  

  $sudo apt-get install php5 libapache2-mod-php5

• In order for PHP to work and be compatible with Apache we must restart it. Type the following code in Terminal to do this:
  

  $sudo /etc/init.d/apache2 restart

• In order to test PHP, in the terminal copy/paste the following line:
  

  $sudo gedit /var/www/testphp.php

• Copy/Paste this line into the phptest file: <?php phpinfo(); ?>
• Save and close the file.
• http://localhost/testphp.php
• Once again open up the amazing Terminal and then copy/paste this line:
  

  $sudo apt-get install mysql-server

• This is where things may start to get tricky. Begin by typing the following into Terminal:
  

  $mysql -u root -p

• Following that copy/paste this line:
  

  $mysql> SET PASSWORD FOR ‘root’@'localhost’ = PASSWORD(’yourpassword’);

• We are now going to install a program called phpMyAdmin which is an easy tool to edit your databases. Copy/paste the following line into Terminal:
  

  $sudo apt-get install libapache2-mod-auth-mysql php5-mysql phpmyadmin

• After that is installed our next task is to get PHP to work with MySQL. To do this we will need to open a file entitled php.ini. To open it type the following:
  

  $sudo gedit /etc/php5/apache2/php.ini

• Now we are going to have to uncomment the following line by taking out the semicolon (;). ;extension=mysql.so To look like this: extension=mysql.so

Now just restart Apache and you are all set!

$sudo /etc/init.d/apache2 restart

We are ready to start code in PHP using MySQL for database and Apache as HTTP server in Ubuntu!!!