Observium Install on CentOS 7.x

Disable Firewall and selinux

This is a choice you'll have to make if you want these disabled.
Refer to Firewall_for_Linux

Prerequisite Repositories

yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
yum install https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
yum install http://yum.opennms.org/repofiles/opennms-repo-stable-rhel7.noarch.rpm

Package Installs

yum install wget httpd php70w php70w-opcache php70w-mysql php70w-gd php70w-posix php70w-mcrypt php70w-pear net-snmp net-snmp-utils fping mariadb-server mariadb MySQL-python rrdtool subversion jwhois ipmitool graphviz ImageMagick

systemctl enable mariadb 
systemctl enable httpd
systemctl start mariadb 
systemctl start httpd

Observium Install

Community Install

cd /opt
wget http://www.observium.org/observium-community-latest.tar.gz
tar zxvf observium-community-latest.tar.gz
rm -f observium-community-latest.tar.gz

Monthly Stable Install

Paid version. At time of writing £150 (pounds) per year.

cd /opt
svn co http://svn.observium.org/svn/observium/branches/stable observium

Create SQL Database

The below is using a username of myobservium and a password of somerandompassword

mysql
CREATE DATABASE observium DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
GRANT ALL PRIVILEGES ON observium.* TO 'myobservium'@'localhost' IDENTIFIED BY 'somerandompassword';
flush privileges;
exit

Config File

cd /opt/observium
cp config.php.default config.php

vi config.php

Modify Entries

// Database config ---  This MUST be configured
$config['db_extension'] = 'mysqli';
$config['db_host']      = 'localhost';
$config['db_user']      = 'myobservium';
$config['db_pass']      = 'somerandompassword';
$config['db_name']      = 'observium';

Add entry

$config['fping'] = "/usr/sbin/fping";
$config['fping6'] = "/usr/sbin/fping6";

Create Config Folders

mkdir logs
mkdir rrd
chown apache:apache logs
chown apache:apache rrd

Populate SQL Database

php /opt/observium/discovery.php -u

Create Apache WEB Site

vi /etc/httpd/conf/httpd.conf

Add the following to the end of the file

 <VirtualHost *:80>
  DocumentRoot /opt/observium/html/
  ServerName  observium.domain.com
  CustomLog /opt/observium/logs/access_log combined
  ErrorLog /opt/observium/logs/error_log
    <Directory "/opt/observium/html/">
      AllowOverride All
      Options FollowSymLinks MultiViews
      Require all granted
    </Directory>
 </VirtualHost>

Create Admin User

/opt/observium/adduser.php <username> <password> 10

Add Device

This command is for the CLI but can be done from the WEB interface

/opt/observium/add_device.php <hostname> <community> v2c

Cron Job

crontab -e

Add the following Lines

30 4 * * * /opt/observium/discovery.php -h all >> /dev/null 2>&1
*/5 * * * * /opt/observium/poller-wrapper.py 15 >> /dev/null 2>&1

22 2 * * * /opt/observium/housekeeping.php -ay

Housekeeping

vi /opt/observium/config.php

Add the following

// Purge log files
// in seconds before automatically purging; 0 to disable (i.e. 30*86400 for 30 days.)
$config['housekeeping']['deleted_ports']['age'] = 604800;   //  7 Days
$config['housekeeping']['syslog']['age'] = 5184000;         // 60 Days
$config['housekeeping']['eventlog']['age'] = 7776000;       // 90 Days
$config['housekeeping']['rrd']['age'] = 7776000;            // 90 Days
$config['housekeeping']['rrd']['invalid'] = TRUE;
$config['housekeeping']['timing']['age'] = 604800;          //  7 Days

WMI

If you wish to gather further information from Windows computers using WMI then you will need the following, along with the appropriate configuration and enabling of WMI in Observium

rpm -Uvh  http://www6.atomicorp.com/channels/atomic/centos/7/x86_64/RPMS/wmi-1.3.14-4.el7.art.x86_64.rpm

NOTE: It seems that using WMI to monitor storage stops the graphing of disk usage. If you disable disk monitoring in WMI and enable in modules so that disk graphing is done by SNMP data rather than WMI seems to fix this problem.

vi /opt/observium/config.php

// Enable default WMI Paramaters
$config['wmi']['domain'] = "domainname"; // NetBIOS Name Shorthand Domain/Workgroup (ie. notdomain.local.com)
$config['wmi']['user'] = "useraccount";
$config['wmi']['pass'] = "passw0rd";
$config['wmi']['modules']['storage'] = 0;

$config['poller_modules']['wmi'] = 1;

Syslog Server

yum install rsyslog
systemctl enable rsyslog
systemctl start rsyslog

vi /etc/rsyslog.conf

Uncommment the following lines

$ModLoad imudp
$UDPServerRun 514

Add the following to the end of the file.

# Always use full names with domain part
$PreserveFQDN on

Create a new file

touch /etc/rsyslog.d/30-observium.conf

add the following lines

vi /etc/rsyslog.d/30-observium.conf

#---------------------------------------------------------
#send remote logs to observium

$template observium,"%fromhost%||%syslogfacility%||%syslogpriority%||%syslogseverity%||%syslogtag%||%$year%-%$month%-%$day% %timereported:8:25%||%msg%||%programname%\n"
$ModLoad omprog
$ActionOMProgBinary /opt/observium/syslog.php

:inputname, isequal, "imudp" :omprog:;observium

& ~
# & stop
#---------------------------------------------------------

Enable Syslog in Observium

vi /opt/observium/config.php

// Enable Syslog
$config['enable_syslog'] = 1;
$config['syslog']['debug'] = TRUE;

systemctl restart rsyslog

PHP Timezone

By default the Apache server does not recognise the time zone that your server is located. You will need to ensure that you configure PHP for the correct timezone.

vi /etc/php.ini

date.timezone = Australia/Brisbane

For a complete list of timezones.

Additional Packages

yum -y install mtr nmap libvirt-client

Add the following line as Observium by default will look for /usr/bin/mtr

vi /opt/observium/config.php

$config['mtr'] = "/usr/sbin/mtr";