Haproxy
HAProxy is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications. It is particularly suited for web sites crawling under very high loads while needing persistence or Layer7 processing. Supporting tens of thousands of connections is clearly realistic with todays hardware. Its mode of operation […]

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Monitoring services using Mon
mon is a general-purpose scheduler and alert management tool used for monitoring service availability and
triggering alerts upon failure detection.
Mon uses some Linux command and services such as ping command to check host connectivity and mail servers for sending mail, so you must install postfix and other packages so that mon should work […]

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Monit is a utility for managing and monitoring processes, files, directories and devices on a Unix system. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations. E.g. monit can start a process if it does not run, restart a process if it does not respond and stop a […]

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Introduction
When screen is called, it creates a single window with a  shell  in  it and then gets out of your way so that you can use the program as you normally would.  Then, at any time, you  can create new windows with other programs in them (including more shells), kill existing windows, view a list […]

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Install these packages with apt:
php5
php5-cli
php5-dev
php5-sqlite
php-pear
$ sudo apt-get install php5 php5-cli php5-dev php5-sqlite php-pear
Test if Apache and PHP are up and running typing in the browser:
http://localhost/
You should see something like:
Apache/2.0.55 (Ubuntu) PHP/5.1.2-1ubuntu1 Server at localhost Port 80
From the command line, as root:
$ sudo pear upgrade PEAR
$ sudo pear channel-discover pear.symfony-project.com
Edit /etc/php5/cli/php.ini and change the line:
memory_limit = […]

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Using the command dd you can create swap file.
dd - convert and copy a file
First of all check the current swap size using the command ‘free’
$ free
Output
total used free shared buffers […]

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If you get an error message like below.
perl: warning: Setting locale failed.
perl: warning: Please check that your locales settings:
LANGUAGE = “en_JP:en”,
LC_ALL = (unset),
LANG = “en_US.UTF-8″
are supported and […]

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Recovering MySQL Password and Permission Problems
If you garble your GRANT commands or forget passwords and find that you don’t have access to the critical mysql table even as the root user don’t panic. You can access MySQL without password. Superuser can access MySQL using mysqld_safe command and you can change mysql password. Become the […]

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MAC OS is one of the OS which gives impresive graphical ability and interface. My friends where planning to buy an apple laptop only because of its graphics, I myself attracted to MAC OS. There are some hardware compatibility issues for running MAC OS on Intel Hardware. So well other alternative to using MAC OS […]

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Introduction
Memcached is a high-performance, distributed caching system. It is often used to speed up dynamic database-driven websites by caching data and objects in memory to reduce the number of times the database must be read.
Installing memcached
shahid@shahid-laptop:~$ sudo apt-get install memcached
shahid@shahid-laptop:~$ sudo apt-get install php5-memcache
After installing these two packages next step is to configure memcached.conf file. […]

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