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1. Requires a Unix or Unix like operating system
2. Requires a web server (e.g apache web server) with PHP 5.4 or higher. Make sure have enabled mod_rewrite module in httpd.conf file and enable PHP SOAP extension
3. Install Composer
4. MYSQL database installation (Required if the user is hosting Airavata on his own. To communicate with SciGaP this step is not relevant)
5. MCrypt PHP extension
6. Enable OpenSSL PHP extension
7. Follow instructions given in links to install the prerequisites based on the OS ;
   1. On Ubunutu: http://www.dev-metal.com/install-laravel-4-ubuntu-12-04-lts/
   2. On Centos: https://www.digitalocean.com/community/tutorials/how-to-install-laravel-4-on-a-centos-6-vps
   3. On MAC OS: http://sangatpedas.com/20140219/installing-laravel-osx-mavericks/
8. Important: Do not need to install Laravel. You can skip the steps given on the links

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Installing PGA

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in Ubuntu OS

Download PGA from GIT

1. Download PGA from github to the document root of you web server /var/www. 
2. Use git clone https://github.com/apache/airavata-php-gateway.git or download the zip from the github web page.
3. Go inside the PGA directory (e.g /var/www/airavata-php-gateway)
4. Make sure the storage folder is writable
   1. sudo chmod -R 755 app/storage
5. Go to [PGA_HOME]/app/config/pga_config.php and change the configuration to match your settings
   
6. Now issue composer install update command
   1. sudo composer installupdate
7. Restart the web server
   1. sudo service apache2 restart

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provide permission to storage by
sudo chmod -R 777 app/storage
Now restart the apache server again and test PGA web-interface.

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Installing PGA

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on Arch Linux

1. Install the necessary dependencies:

   1. $ sudo pacman -S polkit apache php php-apache php-mcrypt php-composer mariadb

2. Enable the appropriate extensions:

   1. $ sudo vim /etc/php/php.ini
Uncomment the following extensions: mcrypt.so, openssl.so, pdo_mysql.so, and soap.so

   2. $ sudo vim /etc/httpd/conf/httpd.conf
Uncomment the following extension: rewrite_module modules/mod_rewrite.so
Replace the mpm_event_module modules/mod_mpm_event.so with mpm_prefork_module modules/mod_mpm_prefork.so
Add the following line: LoadModule php5_module modules/libphp5.so
Add the following line: Include conf/extra/php5_module.conf

3. Create necessary MySQL config:

   1. $ sudo mysql_install_db --user=mysql --basedir=/usr --datadir=/var/lib/mysql

4. Start and enable the Apache and MySQL daemons:

   1. $ sudo systemctl start polkit
$ sudo systemctl start httpd
$ sudo systemctl enable httpd$ sudo systemctl start mysqld
      $ sudo systemctl enable mysqld

   2. Note: you may need to reboot to start polkit

   Complete the MySQL installation:

   2. $ sudo mysql_secure_installation

5. Add a MySQL user:

   1. $ mysql -u root -p
> CREATE USER 'forge'@'localhost';
> GRANT ALL PRIVILEGES ON * . * TO 'forge'@'localhost'; 
> CREATE DATABASE 'forge';
> FLUSH PRIVILEGES;
> exit 

6. Clone the PGA git repository:

   1. $ cd /srv/http
$ sudo git clone https://github.com/apache/airavata-php-gateway.git
$ sudo chown -R $USER airavata-php-gateway

7. Configure the PGA:
   1. $ cd airavata-php-gateway
$ cp app/config/pga_config.php.example app/config/pga_config.php
$ vim app/config/pga_config.php
   2. Note: make sure to make the directory pointed to by 'experiment-data-root' in pga_config.php and chmod 777 it. By default, this is /srv/http/experimentData
8. Configure the PGA storage permissions:

   1. $ chmod -R 777 app/storage 

9. Install Update using Composer:

   1. $ sudo composer installupdate

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Installing PGA

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in MAC OS

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Installing Prerequisites

1. To install MCrypt for PHP on MAC please follow the steps in http://coolestguidesontheplanet.com/install-mcrypt-php-mac-osx-10-9-mavericks-development-server/
2. Once above is completed follow the steps given in http://sangatpedas.com/20140219/installing-laravel-osx-mavericks/ for
   1. Configuring Apache
   2. Installing Composer 

Download and Configure PGA

1. cd /Library/WebServer/Documents

2. git clone https://github.com/apache/airavata-php-gateway.git

3. cd /Library/WebServer/Documents/airavata-php-gateway

4. Make sure the storage folder is writable

   1. sudo chmod -R 755 app/storage

5. (optional) Go to [PGA_HOME]/app/config/pga_config.php and change the configuration to match your settings
   
6. Enable Apache extensions (mod_rewrite module and PHP SOAP extension)

   1.  sudo vim /etc/apache2/httpd.conf

      1. uncomment #LoadModule rewrite_module libexec/apache2/mod_rewrite.so

      2. uncomment #LoadModule php5_module libexec/apache2/libphp5.so

7. Now issue composer install update command

   1. sudo composer installupdate

8. Restart the web server

   1. sudo apachectl restart

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