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Tuesday, November 17, 2009

How to setup Nagios Server on Redhat




1. Don't install nagios using RPM,instead download the source code tarballs of both Nagios and the Nagios plugins (visit http://www.nagios.org/download/ for links to the latest versions).


2. Create Account Information
Become the root user.
su -l
3. Create a new nagios user account and give it a password.
/usr/sbin/useradd -m nagios
passwd nagios
4. 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 -G nagcmd nagios
/usr/sbin/usermod -G nagcmd apache

5. Extract the Nagios source code tarball.

cd ~/downloads
tar xzf nagios-3.0.3.tar.gz
cd nagios-3.0.3

Run the Nagios configure script, passing the name of the group you created earlier like so:
./configure --with-command-group=nagcmd
6. Compile the Nagios source code.
# make all
Install binaries, init script, sample config files and set permissions on the external command directory.

# make install
# make install-init
# make install-config
# make install-commandmode

7. 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 the nagiosadmin contact definition to the address you'd like to use for receiving alerts.
vi /usr/local/nagios/etc/objects/contacts.cfg
8. Configure the Web Interface
Install the Nagios web config file in the Apache conf.d directory.
make install-webconf
root@lvs2 nagios-3.0.3]# make install-webconf
/usr/bin/install -c -m 644 sample-config/httpd.conf /etc/httpd/conf.d/nagios.conf
8. Create a nagiosadmin account for logging into the Nagios web interface.
htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
Restart Apache to make the new settings take effect.
service httpd restart
9. Compile and Install the Nagios Plugins
Extract the Nagios plugins source code tarball.

cd ~/downloads
tar xzf nagios-plugins-1.4.11.tar.gz
cd nagios-plugins-1.4.11

10. Compile and install the plugins.

./configure --with-nagios-user=nagios --with-nagios-group=nagios
make
make install
Start Nagios

11. Add Nagios to the list of system services and have it automatically start when the system boots.

chkconfig --add nagios
chkconfig 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
12. Object configuration files
As mentioned, when the configuration files are split up, Nagios reads the data from these files in order for it to process host and service checks across the network. Before I begin, detailed documentation of all of the options for the template based objects are located at the website.

# cd /usr/local/nagios/etc/objects/
# touch hostgroup.cfg hosts.cfg services.cfg

# vi localhost.cfg
Copy the Services Definitions
# vi services.cfg
Paste the Services Definitions
#vi localhost.cfg
Copy the Host Definitions
#vi hosts.cfg
Paste the Host Definitions
#vi localhost.cfg
Copy the Host Definitions
# vi hostgroup.cfg
Paste the hostgroup Definitions
Setting up nagios.cfg

[me@rhel ~] cd /etc/nagios
[me@rhel nagios] mv localhost.cfg localhost.cfg_org

Turn on the allow commands to be executed from the CGI web interface.
[me@rhel nagios] vi nagios.cfg

# OBJECT CONFIGURATION FILE(S)
cfg_file=/etc/nagios/contacts.cfg
cfg_file=/etc/nagios/hostgroups.cfg
cfg_file=/etc/nagios/hosts.cfg
cfg_file=/etc/nagios/services.cfg
cfg_file=/etc/nagios/timeperiods.cfg


# EXTERNAL COMMAND OPTION
check_external_commands=1


# EXTERNAL COMMAND CHECK INTERVAL
command_check_interval=1


2 comments:

CHARLIE27 said...

hello I installed nagios without a problem , but from outside world I cannot access it because iptables is blocking it, do you know how to fix this?

regards
porrascarlos80@hotmail.com

juliaroberts said...

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Which Linux distribution has ease of use?