Linux (Ubuntu) Installation - Supporting Software - 14.04

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This document describes the needed installation and configuration of supporting software for iHRIS on Ubuntu 14.04 LTS, Trusty Tahr.

Getting Ready

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 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.

Configuring MYSQL

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>

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>


Manual Install

Set ZendOpcache options

Edit the opcache config file with this command: <source lang="bash"> sudo gedit /etc/php5/mods-available/opcache.ini </source> It should look like this for a production system: <source lang="ini">

configuration for php ZendOpcache module
priority=05 opcache.memory_consumption=128M opcache.interned_strings_buffer=8 opcache.max_accelerated_files=4000 opcache.revalidate_freq=60 opcache.fast_shutdown=1 opcache.enable_cli=1 </source> For a development system you should update revalidate_freq to be this: <source lang="ini"> opcache.revalidate_freq=2 </source>

Install APCu

Run the following commands to get the latest version of APCu and install it: <source lang="bash"> sudo apt-get install git php5-dev php-config make libpcre3-dev git clone cd apcu phpize ./configure --with-php-config=/usr/bin/php-config make export TEST_PHP_ARGS='-n' make test make install </source>

NB: This assumes you have php-config installed in the path /usr/bin/php-config. You can get the path where php-config is installed by running <source lang="bash"> which php-config </source>

Edit the configuration file: <source lang="bash"> sudo gedit /etc/php5/mods-available/apcu.ini </source> The file should look like this: <source lang="ini"> apc.enabled=1 apc.shm_size=100M apc.enable_cli=1 apc.slam_defense=0 apc.write_lock=1 </source>

Now activate the module for Apache and CLI: <source lang="bash"> sudo ln -s /etc/php5/mods-available/apcu.ini /etc/php5/apache2/conf.d/20-apcu.ini sudo ln -s /etc/php5/mods-available/apcu.ini /etc/php5/cli/conf.d/20-apcu.ini </source>

You'll need to restart Apache after making this change. <source lang="bash"> sudo /etc/init.d/apache2 restart </source>

Automatic Install (currently bugged)

NOTE: Do not use php5-apcu currently. There is a bug that will cause iHRIS to not run.

We need to install the APCu module for PHP. <source lang='bash'> sudo apt-get install php5-apcu </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 apcu: <source lang="bash"> sudo gedit /etc/php5/mods-available/apcu.ini </source> It should look like this: <source lang="ini"> apc.enabled=1 apc.write_lock=1 apc.shm_size=100M apc.slam_defense=0 apc.enable_cli=1 </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>

Debian Squeeze

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/apache2.conf </source> Change: <source lang="apache"> <Directory /var/www/>

       Options Indexes FollowSymLinks

AllowOverride None Require all granted </Directory> </source> to: <source lang="apache"> <Directory /var/www/> Options Indexes FollowSymLinks MultiViews AllowOverride All Require all granted </Directory> </source> Save and quit.

Let us restart the Apache webserver using: <source lang="bash"> sudo service apache2 restart </source>

Install Memcached

With version 4.0.4 and greater 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 service apache2 restart

you should now do

sudo service apache2 restart && sudo service memcached restart

To install, simply do <source lang='bash'>

sudo apt-get install php5-memcached memcached