openSUSE Nagios Quickstart
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Introduction
This guide is intended to provide you with simple instructions on how to install Nagios from source (code) on openSUSE and have it monitoring your local machine inside of 20 minutes. No advanced installation options are discussed here - just the basics that will work for 95% of users who want to get started.
These instructions were written based on an openSUSE 10.2 installation.
Required Packages
Make sure you've installed the following packages on your openSUSE installation before continuing. You can useyast to install packages under openSUSE.
- apache2
- C/C++ development libraries
1) Create Account Information
Become the root user.
su -l
Create a new nagios user account and give it a password.
/usr/sbin/useradd -m nagiospasswd nagios
Create a new nagios group. Add the nagios user to the group.
/usr/sbin/groupadd nagios/usr/sbin/usermod -G nagios nagios
Create a new nagcmd group for allowing external commands to be submitted through the web interface. Add both the nagios user and the apache user to the group.
/usr/sbin/groupadd nagcmd/usr/sbin/usermod -a -G nagcmd nagios/usr/sbin/usermod -a -G nagcmd wwwrun
2) Download Nagios and the Plugins
Create a directory for storing the downloads.
mkdir ~/downloadscd ~/downloads
Download the source code tarballs of both Nagios and the Nagios plugins (visithttps://www.nagios.org/download/ for links to the latest versions). These directions were tested with Nagios 3.1.1 and Nagios Plugins 1.4.11.
wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.2.3.tar.gzwget http://prdownloads.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.11.tar.gz
3) Compile and Install Nagios
Extract the Nagios source code tarball.
cd ~/downloadstar xzf nagios-3.2.3.tar.gzcd nagios-3.2.3
Run the Nagios configure script, passing the name of the group you created earlier like so:
./configure --with-command-group=nagcmd
Compile the Nagios source code.
make all
Install binaries, init script, sample config files and set permissions on the external command directory.
make installmake install-initmake install-configmake install-commandmode
Don't start Nagios yet - there's still more that needs to be done...
4) Customize Configuration
Sample configuration files have now been installed in the /usr/local/nagios/etc directory. These sample files should work fine for getting started with Nagios. You'll need to make just one change before you proceed...
Edit the /usr/local/nagios/etc/objects/contacts.cfg config file with your favorite editor and change the email address associated with thenagiosadmin contact definition to the address you'd like to use for receiving alerts.
vi /usr/local/nagios/etc/objects/contacts.cfg
5) Configure the Web Interface
Install the Nagios web config file in the Apache conf.d directory.
make install-webconf
Create a nagiosadmin account for logging into the Nagios web interface. Remember the password you assign to this account - you'll need it later.
htpasswd2 -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
Restart Apache to make the new settings take effect.
service apache2 restart
Note: Consider implementing the ehanced CGI security measures describedhere to ensure that your web authentication credentials are not compromised.
6) Compile and Install the Nagios Plugins
Extract the Nagios plugins source code tarball.
cd ~/downloadstar xzf nagios-plugins-1.4.11.tar.gzcd nagios-plugins-1.4.11
Compile and install the plugins.
./configure --with-nagios-user=nagios --with-nagios-group=nagiosmakemake install
7) Start Nagios
Add Nagios to the list of system services and have it automatically start when the system boots.
chkconfig --add nagioschkconfig nagios on
Verify the sample Nagios configuration files.
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
If there are no errors, start Nagios.
service nagios start
8) Login to the Web Interface
You should now be able to access the Nagios web interface at the URL below. You'll be prompted for the username (nagiosadmin) and password you specified earlier.
http://localhost/nagios/
Click on the "Service Detail" navbar link to see details of what's being monitored on your local machine. It will take a few minutes for Nagios to check all the services associated with your machine, as the checks are spread out over time.
9) Other Modifications
Make sure your machine's firewall rules are configured to allow access to the web server if you want to access the Nagios interface remotely.
You can do this by:
- Opening the control center
- Select 'Open Administrator Settings' to open the YaST administrator control center
- Select 'Firewall' from the 'Security and Users' category
- Click the 'Allowed Services' option in the Firewall Configuration window
- Add 'HTTP Server' to the allowed services list for the 'External Zone'
- Click 'Next' and 'Accept' to activate the new firewall settings
Configuring email notifications is outside the scope of this documentation. Refer to your system documentation, search the web, or look to theNagios Support Portal orNagios Community Wiki for specific instructions on configuring your openSUSE system to send email messages to external addresses.
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