Linux (Ubuntu) Installation - Supporting Software - 12.04
This document describes the needed installation and configuration of supporting software for iHRIS on Ubuntu 12.04, Precise Pangolin.
Here are instructions for installing the supporting software for iHRIS on a Linux (Ubuntu) system. If you need help installing Ubuntu you may want to take a look at these directions for installing a Server or a Desktop system. For a server setup, we recommend using a LTS (long term support) version of Ubuntu.
Note: Unless specifically mentioned, all the commands below are run using a terminal. You can start this in Ubuntu by going to Applications -> Accessories -> Terminal. Any time a command begins with sudo it will prompt for your password because this will be run with administrative privileges. When you run sudo multiple times, only the first time will ask for your password.
Note: Some installation commands will prompt for inputs in the terminal window, usually with a blue background. The mouse doesn't work to click on options here. You can use Tab to move between options and the space bar to check or uncheck selections.
Note: Some commands will launch the gedit file editor. Look at the documentation if you need additional help.
We begin by install a Lamp server (You can find more help here): <source lang="bash"> sudo apt-get install tasksel sudo tasksel install lamp-server </source> If you have never used mysql on your system, you will be asked to set the 'root' password for mysql. We will refer to this password as XXXXX below.
Important: Make sure your email system is correctly configured. Under a default Ubuntu installation, you can do this with one of two commands: <source lang="bash"> sudo apt-get install postfix sudo dpkg-reconfigure postfix </source>
Follow the on-screen instructions to set up email on your system. For additional help with installing Postfix, look at these instructions. On Debian systems, the same commands can be used, but exim4 is the default MTA instead of postfix
If you are using another Linux distribution, make sure your system can send email properly before continuing.
Make sure you have in /etc/mysql/my.cnf the following values set: <source lang="bash"> sudo gedit /etc/mysql/my.cnf </source> <source lang="ini"> query_cache_limit = 4M query_cache_size = 64M </source> It appears that they were reduced with Karmic.
To configure MySQL so iHRIS can create needed functions: <source lang="bash"> mysql -u root -p </source> Enter the password you set above (XXXXX) for MySQL. You will now be able to send commands to MySQL and the prompt should always begin with 'mysql> '. Type these commands: <source lang="mysql"> SET GLOBAL log_bin_trust_function_creators = 1; exit </source>
Next, you'll need to increase the memory limit for PHP. You can do this by editing the /etc/php5/apache2/php.ini. <source lang="bash"> sudo gedit /etc/php5/apache2/php.ini </source>
Change the following line: <source lang="ini"> memory_limit = 32M </source> to: <source lang="ini"> memory_limit = 128M </source>
Installing Pear and PECL Packages
We need to install a few Pear and PECL packages for PHP. For the Pear packages you can do: <source lang="bash"> sudo apt-get install php-pear php-mdb2 php-mdb2-driver-mysql php5-gd php5-tidy php5-intl sudo pear install text_password console_getopt </source>
NOTE: In a recent install of 12.04 LTS server, the PHP version is 5.5.3 and a buggy version of APCu is being used. Instead of following the instructions below, try these
We need to install the APC module for PHP. <source lang='bash'> sudo apt-get install php-apc </source>
During certain activities like installation and upgrades you may need more memory than APC uses by default. We also want to turn of the slam defense. We need to edit the configuration file file for apc: <source lang="bash"> sudo gedit /etc/php5/conf.d/apc.ini </source> It should look like this: <source lang="ini"> extension=apc.so apc.write_lock=1 apc.shm_size=100M apc.slam_defense=0 </source> See slam defense and this.
You'll need to restart Apache after making this change. <source lang="bash"> sudo /etc/init.d/apache2 restart </source>
If you are using Debian Squeeze, then the value of apc.shm_size should be: <source lang='bash'> apc.shm_size=100 </source>
Configuring Apache Web Server
You will see later we are using the apache rewrite module. To enable the module: <source lang="bash"> sudo a2enmod rewrite </source> Now we need to make sure we can use the .htaccess file. <source lang="bash"> sudo gedit /etc/apache2/sites-available/default </source> Change: <source lang="apache"> <Directory /var/www/> Options Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> </source> to: <source lang="apache"> <Directory /var/www/> Options Indexes FollowSymLinks MultiViews AllowOverride All Order allow,deny allow from all </Directory> </source> Save and quit.
Let us restart the Apache webserver using: <source lang="bash"> sudo /etc/init.d/apache2 restart </source>
With version 4.0.4 of iHRIS you can use memcached to improve performance
Note: Memcached is used to cache data from the database. Thus if you are an a sitaution where you would need to restart the webserver by
sudo /etc/init.d/apache2 restart
you should now do
sudo /etc/init.d/apache2 restart && sudo /etc/init.d/memcached restart
To install, simply do <source lang='bash'>
sudo apt-get install php5-memcached memcached