Tag Archives: Linux

java7 install

Install Java7 on Linux (Ubuntu 12.04)

If you are running an older version on java on your Ubuntu 12.04 environment, you must remove it before installing Java7. Do the following to remove:

$sudo apt-get purge openjdk*

If you installed java 7 earlier and having problem with java then you have to do the following to remove it:

$sudo rm /var/lib/dpkg/info/oracle-java7-installer*
$sudo apt-get purge oracle-java7-installer*
$sudo rm /etc/apt/sources.list.d/*java*
$sudo apt-get update

Installing Oracle Java7 on Ubuntu 12.04 LTS:

$sudo add-apt-repository ppa:webupd8team/java
$sudo apt-get update
$sudo apt-get install oracle-java7-installer

You will be prompted couple of times for permissions and Oracle Policy agreement [You must be agreed to Oracle policies to install Java :-)].

That’s it! Now you have Oracle Java7 installed on your Ubuntu 12.04 environment, to check the Java version run the following on terminal:

$java -version
java version "1.7.0_17"
Java(TM) SE Runtime Environment (build 1.7.0_17-b02)
Java HotSpot(TM) 64-Bit Server VM (build 23.7-b01, mixed mode)

Or You can check the java version by searching java in Ubuntu dashboard.

Oracle Java 7 plugin Control Panel -> General Tab -> About

java7 version Ubuntu 12.04

Install APC

How To: Install APC

APC is Alternative PHP Cache. APC is an opcode cache that speed up your PHP applications, by caching both PHP code and user variables. Adding APC to an application improves application response time, reduces server load and make your users happy. This is a free, open, and robust framework for caching and optimizing PHP intermediate code. APC reads your PHP files, parses them into binary format and then caches them in memory so that each request for your PHP files and PHP library files can be served from the parsed cache.

You can see the difference by tracing your code through Xdebug or Zend debugger. You will definately notice a big difference.

Installing APC on RHEL:

First, login as Root User using “su” command.

$pecl install apc

If pecl doesn’t work, install php-devel

$yum install php-devel.i386

if still doesn’t work, if the pecl don’t work then, Please install PEAR first

Then create and add the following to apc.ini

$echo extension=apc.so > /etc/php.d/apc.ini

Restart the Apache webserver:

$service httpd restart

Installing APC on Ubuntu:

$sudo apt-get install php-apc
$sudo /etc/init.d/apache2 restart

That’s it!!! You are done, APC is installed on your web server.


How to downgrade PHP version from 5.3.X to 5.2.X on Linux RHEL6.2?

Login as a Root User using “su” command

$yum remove php*

Install the atomic repositories like this

$wget -q -O – http://www.atomicorp.com/installers/atomic | sh
$vi /etc/yum.conf

edit /etc/yum.conf and add this line at the end of the file


This is very important for not upgrading those versions of PHP and MySQL

$yum update

and, now you have php 5.2.17 running on your server