How to install Observium Completely MyWay on Ubuntu 12.04 LTS

Install Ubuntu 12.04, no encrypted home folder, no LVM, GRUB boot loader is okay. 

sudo passwd
set root password
su - root

Set static IP address
cp /etc/network/interfaces interfaces.dhcp
pico /etc/network/interfaces
auto eth0
iface eth0 inet static
        address <address>
        netmask <netmask>
        gateway <gateway>


Set DNS
apt-get install resolvconf
cd /etc/resolvconf/resolv.conf.d
cp -p head head.orig  #backup copy, always do this
nano head
nameserver <ip_of_nameserver>
resolvconf -u


Set Hostname
pico /etc/hosts #add name of server
pico /etc/hostname #add name of server
hostname <FQDN of the server>
/etc/init.d/networking restart
hostname
hostname -f #verify name of server
shutdown -r now


Install Observium


#apt-get install libapache2-mod-php5 php5-cli php5-mysql php5-gd php5-snmp php-pear snmp graphviz php5-mcrypt php5-json \
subversion mysql-server mysql-client rrdtool fping imagemagick whois mtr-tiny nmap ipmitool python-mysqldb

#mkdir -p /opt/observium && cd /opt

#wget http://www.observium.org/observium-community-latest.tar.gz
#tar zxvf observium-community-latest.tar.gz

#rm tar zxvf observium-community-latest.tar.gz

#cd observium

#cp config.php.default config.php

#pico config.php

Edit the username, password and email for the system.
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## Have a look in includes/defaults.inc.php for examples of settings you can set here. DO NOT EDIT defaults.inc.php!

// Database config
$config['db_host'] = 'localhost';
$config['db_user'] = 'root';
$config['db_pass'] = '<password>';
$config['db_name'] = 'observium';

// Location
$config['install_dir']  = "/opt/observium";

// Thie should *only* be set if you want to *force* a particular hostname/port
// It will prevent the web interface being usable form any other hostname
#$config['base_url']        = "http://observium.company.com";

// Default community list to use when adding/discovering
$config['snmp']['community'] = array("<communityname>");

// Authentication Model
$config['auth_mechanism'] = "mysql";    // default, other options: ldap, http-auth, please see documentation for config help

// Enable alerter
// $config['poller-wrapper']['alerter']       = TRUE;

// Set up a default alerter (email to a single address)
$config['alerts']['alerter']['default']['descr']   = "Default Email Alert";
$config['alerts']['alerter']['default']['type']    = "email";
$config['alerts']['alerter']['default']['contact'] = "<emailaddress>";
$config['alerts']['alerter']['default']['enable']  = TRUE;


// End config.php

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mysql -u root -p
<mysql root password>
mysql> CREATE DATABASE observium;
mysql> GRANT ALL PRIVILEGES ON observium.* TO 'root'@'localhost' IDENTIFIED BY '<observium db password>';
mysql> exit
#php includes/update/update.php
# mkdir rrd
# chown www-data:www-data rrd
# cp /etc/apache2/sites-available/default /etc/apache2/sites-available/default.orig
# rm /etc/apache2/sites-available/default
# pico /etc/apache2/sites-available/default

/etc/apache2/sites-available/default
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
<VirtualHost *:80>
       ServerAdmin webmaster@localhost
       DocumentRoot /opt/observium/html
       <Directory />
               Options FollowSymLinks
               AllowOverride None
       </Directory>
       <Directory /opt/observium/html/>
               Options Indexes FollowSymLinks MultiViews
               AllowOverride All
               Order allow,deny
               allow from all
       </Directory>
       ErrorLog  ${APACHE_LOG_DIR}/error.log
       LogLevel warn
       CustomLog  ${APACHE_LOG_DIR}/access.log combined
       ServerSignature On
</VirtualHost>

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# cd /etc/apache2
# a2enmod rewrite
# apache2ctl restart
# cd /opt/observium
# ./adduser.php <username> <password> 10
# ./add_device.php <hostname> <community> v2c
# ./discovery.php -h all
# ./poller.php -h all

# pico /etc/cron.d/observium

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33  */6   * * *   root    /opt/observium/discovery.php -h all >> /dev/null 2>&1
*/5 *     * * *   root    /opt/observium/discovery.php -h new >> /dev/null 2>&1
*/5 *     * * *   root    /opt/observium/poller-wrapper.py 1 >> /dev/null 2>&1
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Go to http://<server ip> and login with previously created credentials.