Observium: A Complete Network Management and Monitoring System for RHEL/CentOS

Observium is a PHP/MySQL driven Network Observation and Monitoring application, that supports a wide range of operating systems/hardware platforms including, Linux, Windows, FreeBSD, Cisco, HP, Dell, NetApp and many more. It seeks to present a robust and simple web interface to monitor health and performance of your network.

Install Observium in CentOS

Install Observium in CentOS/RHEL

Observium gathers data from devices with the help of SNMP and display those data in graphical pattern via a web interface. It makes hefty use of the RRDtool package. It has a number of thin core design goals, which includes collecting as much historical information about devices, being totally auto-discovered with slight or no manual interruption, and having a very simple yet powerful interface.

Observium Demo

Please have a quick online demo of the Observium deployed by the developer at the following location.

  1. http://demo.observium.org/

This article will guide you on how to install Observium on RHEL, CentOS and Scientific Linux, the supported version is EL (Enterprise Linux) 6.x. Currently, Observium unsupported for EL release 4 and 5 respectively. So, please don’t use following instructions on these releases.

Step 1: Adding RPM Forge and EPEL Repositories

RPMForge and EPEL is a repository that provides many add-on rpm software packages for RHEL, CentOS and Scientific Linux. Let’s install and enable these two community based repositories using the following serious of commands.

On i386 Systems
# yum install wget
# wget http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el5.rf.i386.rpm
# wget http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
# wget http://apt.sw.be/RPM-GPG-KEY.dag.txt
# rpm --import RPM-GPG-KEY.dag.txt
# rpm -Uvh rpmforge-release-0.5.3-1.el5.rf.i386.rpm
# rpm -Uvh epel-release-6-8.noarch.rpm
On x86_64 Systems
# yum install wget
# wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.rpm
# wget http://epel.mirror.net.in/epel/6/x86_64/epel-release-6-8.noarch.rpm
# wget http://apt.sw.be/RPM-GPG-KEY.dag.txt
# rpm --import RPM-GPG-KEY.dag.txt
# rpm -Uvh rpmforge-release-0.5.2-2.el6.rf.rpm
# rpm -Uvh epel-release-6-8.noarch.rpm
Install RPMForge Repository

Install RPMForge Repository

Install EPEL Repository

Install EPEL Repository

Installing Repositories

Installing Repositories

Step 2: Install Needed Software Packages

Now let’s install the required software packages needed for Observium.

# yum install httpd php php-mysql php-gd php-snmp vixie-cron php-mcrypt \
php-pear net-snmp net-snmp-utils graphviz subversion mysql-server mysql rrdtool \
fping ImageMagick jwhois nmap ipmitool php-pear.noarch MySQL-python
Install Needed Packages

Install Needed Packages

If you wish to monitor virtual machines, please install ‘libvirt‘ package.

# yum install libvirt

Step 3: Downloading Observium

For your information, Observium has two following editions

  1. Community/Open Source Edition: This edition is freely available for download with less features and few security fixes.
  2. Subscription Edition: This edition is comes with additional features, rapid feature/fixes, hardware support and easy to use SVN-based release mechanism.

Firstly navigate to the /opt directly, here we will going to install Observium as default. If you wish to install somewhere else, please modify commands and configuration accordingly. We strongly suggest you to first deploy under /opt directory. Once you verify that everything works perfectly, you can install at your desired location.

If you have a active Observium subscription, you can use SVN repositories to download most recent version. A valid subscription account only valid for a single installation and two testing or development installations with daily security patches, new features and bug fixes.

To download most recent stable and current version of Observium, you need to have a svn package installed on the system, in order to pull the files from the SVN repository.

# yum install svn
Development Version
# svn co http://svn.observium.org/svn/observium/trunk observium
Stable Version
# svn co http://svn.observium.org/svn/observium/branches/stable observium

We don’t have a valid subscription, So we we are going to try out Observium using the Community/Open Source Edition. Download the latest ‘observium-community-latest.tar.gz’ stable version and unpack it as shown.

# cd /opt
# wget http://www.observium.org/observium-community-latest.tar.gz
# tar zxvf observium-community-latest.tar.gz
Download Observium Community Edition

Download Observium Community Edition

Step 4: Creating Observium MySQL Database

This is a clean installation of MySQL. So, we are going to set a new root password with the help of following command.

# service mysqld start
# /usr/bin/mysqladmin -u root password 'yourmysqlpassword'

Now login into mysql shell and create the new Observium database.

# mysql -u root -p

mysql> CREATE DATABASE observium;
mysql> GRANT ALL PRIVILEGES ON observium.* TO 'observium'@'localhost' IDENTIFIED BY 'dbpassword';

Step 5: Configure Observium

Configuring SELinux to work with Observium is beyond the scope of this article, so we disabled SELinux. If you are familiar with SELinux rules, then you can configure it, but no guarantee that the Observium work with active SELinux. So, better disable it permanently. To do, open ‘/etc/sysconfig/selinux‘ file and change the option from ‘permissive‘ to ‘disabled‘.

# vi /etc/sysconfig/selinux
SELINUX=disabled

Copy the default configuration file ‘config.php.default‘ to ‘config.php‘ and modify the settings as shown.

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

Now open ‘config.php‘ file and enter MySQL details such as database name, username and password.

# vi config.php
// Database config
$config['db_host'] = 'localhost';
$config['db_user'] = 'observium';
$config['db_pass'] = 'dbpassword';
$config['db_name'] = 'observium';

Then add an entry for fping binary location to config.php. In RHEL distribution the location is different.

$config['fping'] = "/usr/sbin/fping";
Enter MySQL Settings

Enter MySQL Settings

Next, run the following command to setup the MySQL database and insert the database default file schema.

# php includes/update/update.php
Insert Observium Database Schema

Insert Observium Database Schema

Step 6: Configure Apache for Observium

Now create a ‘rrd‘ directory under ‘/opt/observium‘ directory for storing RRD’s.

# /opt/observium
# mkdir rrd

Next, grant Apache ownership to ‘rrd‘ directory to write and store RRD’s under this directory.

# chown apache:apache rrd

Create a Apache Virtual Host directive for Obervium in ‘/etc/httpd/conf/httpd.conf‘ file.

# vi /etc/httpd/conf/httpd.conf

Add the following Virtual Host directive at the bottom of the file and enable Virtualhost section as shown in the screenshot below.

<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
  </Directory>
  </VirtualHost>
Create Observium Virtual Host

Create Observium Virtual Host

To maintain observium logs, create a ‘logs‘ directory for Apache under ‘/op/observium‘ and apply Apache ownership to write logs.

# mkdir /opt/observium/logs
# chown apache:apache /opt/observium/logs

After all settings, restart Apache service.

# service httpd restart

Step 7: Create Observium Admin User

Add a first user, give level of 10 for admin. Make sure to replace username and password with your choice.

# cd /opt/observium
# ./adduser.php tecmint tecmint123 10

User tecmint added successfully.

Next add a New Device and run following commands to populate the data for new device.

# ./add_device.php <hostname> <community> v2c
# ./discovery.php -h all
# ./poller.php -h all
Populate Observium Data

Populate Observium Data

Next set a cron jobs, create a new file ‘/etc/cron.d/observium‘ and add the following contents.

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

Reload cron process to take new entries.

# /etc/init.d/cron reload

The final step is to add httpd and mysqld services system-wide, to automatically start after system boot.

# chkconfig mysqld on
# chkconfig httpd on

Finally, open your favourite browser and point to http://Your-Ip-Address.

Observium Login Screen

Observium Login Screen

Observium Dashboard

Observium Dashboard

Observium Screenshot Tour

Following are the screen grabs of last mid-2013, taken from the Observium website. For up-to-date view, please check live demo.

Complete System Information

Complete System Information

Load Average Graphs

Load Average Graphs

Historical Usage Overview

Historical Usage Overview

CPU Frequency Monitoring

CPU Frequency Monitoring

Conclusion

Observium doesn’t mean to completely remove other monitoring tools such as Nagios or Cacti, but rather to addition them with terrific understanding of certain devices. For this reason, its important to deploy Observium with Naigos or other monitoring systems to provide alerting and Cacti to produce customized graphing of your network devices.

Reference Links:

  1. Observium Homepage
  2. Observium Documentation
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Ravi Saive

I am Ravi Saive, creator of TecMint. A Computer Geek and Linux Guru who loves to share tricks and tips on Internet. Most Of My Servers runs on Open Source Platform called Linux. Follow Me: Twitter, Facebook and Google+

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43 Responses

  1. Ravinder says:

    hello,
    I am getting the following error, please advise

    Resolving packages.sw.be (packages.sw.be)… 78.46.17.228
    Connecting to packages.sw.be (packages.sw.be)|78.46.17.228|:80… failed: Connection timed out.
    Retrying.

  2. James Otto says:

    when I execute the following command

    $ sudo service mysqld start

    I get the following error

    Redirecting to /bin/systemctl start mysqld.service
    Failed to issue method call: Unit mysqld.service failed to load: No such file or directory.

    Any ideas what file is missing? I am using Centos7

    • Ravi Saive says:

      @James,

      Have you installed MySQL or MariaDB on the system before starting up the database? after reading your error, it seems there isn’t any mysql installed on the system, better first install database and then try to start it. I think you’re using CentOS 7, so install MariaDB using following command.

      # yum install mariadb mariadb-server
      
  3. Jaco Toledo says:

    Observium is great, not as advanced as Cacti or Nagios but nonetheless a powerful tool to analyze traffic and possible errors i installed it on ubuntu and it runs great here.

  4. John says:

    Why would this NMS not replace something like Cacti? I’ve found it to be a good replacement for Cacti.

  5. Tonmoy says:

    Please upload a video on Youtube on how to install Observium in Cent-OS 6 (VMware workstation 10).

    I have followed the total process. But when I write http://localhost in the browser, it shows the Apache web server page.

    Please suggest.

  6. MissSB says:

    Hi guys,

    I followed the documentation on setting up rsyslog, got a couple of firewalls and routers sending logs to the Observium server (/var/log/syslog) but nothing is replicated on the webconsole. I’m running it on Ubuntu Server 12.04.
    .

  7. Christos Papakostas says:

    I have installed observium on Ubuntu 14.04 LTS. I want to monitor a VM Windows 7 instance. I added device on /etc/hosts, enabled snmp service on Windows 7 and after trying adding the device, the following errors appear on observium,

    [email protected]:/opt/observium# ./add_device.php Christos-PC public
    Observium CE 0.14.11.6000
    Add Device(s)

    Try to add christos-pc:
    Trying v2c community public …
    No reply on community public using v2c.
    Could not reach christos-pc with given SNMP parameters using v2c.
    Trying v1 community public …
    No reply on community public using v1.
    Could not reach christos-pc with given SNMP parameters using v1.
    Devices skipped: 1.

    USAGE:
    add_device.php [community] [v1|v2c] [port] [udp|udp6|tcp|tcp6]
    add_device.php [any|nanp|anp|ap] [v3] [user] [password] [enckey] [md5|sha] [aes|des] [port] [udp|udp6|tcp|tcp6]
    add_device.php

    EXAMPLE:
    SNMPv1/2c: add_device.php [community] [v1|v2c] [port] [udp|udp6|tcp|tcp6]
    SNMPv3 : Defaults : add_device.php any v3 [user] [port] [udp|udp6|tcp|tcp6]
    No Auth, No Priv : add_device.php nanp v3 [user] [port] [udp|udp6|tcp|tcp6]
    Auth, No Priv : add_device.php anp v3 [md5|sha] [port] [udp|udp6|tcp|tcp6]
    Auth, Priv : add_device.php ap v3 [md5|sha] [aes|des] [port] [udp|udp6|tcp|tcp6]
    FILE : add_device.php

    ADD FROM FILE:
    To add multiple devices, create a file in which each line contains one device with or without options.
    Format for device options, the same as specified in USAGE.

    Should I configure snmp parameters(v1 or v2c) on Windows 7 snmp service or the problem is something else I don’t really realize?

  8. Mike says:

    new instance of Observium running on Unbuntu 14.04. i add devices to /etc/hosts and save, go to the GUI and ad Device but it never finishes polling.
    Thanks,
    Mike

  9. Mr.X says:

    Dear Ravi,

    Many thanks for your excellent presentation. I’m trying to install observium in my CentOS 6. But could not make it. I was trying to install it in VMWare 10. Everything goes just fine but when I try to login through the browser, it doesn’t work.

    Can you give me any link of a video where the process is shown step-by-step.

    Waiting eagerly for your reply.

    Thanks in advance.

  10. Ion says:

    I had a problem starting httpd until I rebooted, pretty sure SELinux was the culprit; I did a quick search but to disable it do you really have to reboot? If not it might be a good idea to include a line in this howto…

    • Ravi Saive says:

      Yes, you need a reboot after disabling SELinux.

      • sriram says:

        im very new to admin in linux environment.. My LAN having one unmanagable router and unmanagable switch.. IP Range 192.168.0.0/24… i using centos 6.5 for configure observium. but i couldn’t make it.. i tried with DNS server configuration also but the name dose’t get resolve please help me to build my infra….. :-(

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