Install Nagios Core from Source Along with Plugins
This lab goes through the procedure of compiling and installing Nagios Core directly from the source. This is the long way around, but it comes with advantages such as having the latest version of Nagios Core with all the features. A secondary benefit is a greater understanding of the Nagios Core structure, how it is intended to work, and what files are where.
Install Nagios Core from Source along with Plugins
Your company is switching over to Nagios as a monitoring solution. It falls to you to perform the initial install of Nagios Core on your company's server. You have decided to download the source code for Nagios Core and use that to perform the installation directly. All you need to do is download, unpack, compile, install, and configure the Nagios Core.
Begin by logging in to the lab server using the credentials provided on the hands-on lab page.
Download and Compile Nagios Core
Edit the SELinux config file.
sudo vim /etc/selinux/config
Change the line defining the
SELINUXvariable to the following.
Save the changes and exit the editor.
Modify the current mode for SELinux.
sudo setenforce 0
Check the current SELinux mode. Verify we are in permissive mode.
Install all necessary prerequisites.
sudo yum install -y gcc glibc glibc-common wget unzip httpd php gd gd-devel perl postfix
Download the Nagios Core.
Extract the files from the repository.
tar -xvzf nagios-4.4.3.tar.gz
Navigate to the appropriate directory.
Run the configuration script.
Compile the necessary files.
sudo make all
Create a user and group for Nagios.
sudo make install-groups-users
Add the Nagios user to the Apache group.
sudo usermod -a -G nagios apache
Install the necessary binaries.
sudo make install
Configure Nagios to run as a daemon.
sudo make install-daemoninit
Enable the web server.
sudo systemctl enable httpd.service
Install the Nagios command mode.
sudo make install-commandmode
Install sample files for Nagios.
sudo make install-config
Install Apache configuration files.
sudo make install-webconf
Configure and Run Nagios
Configure a firewall rule for Nagios.
sudo firewall-cmd --zone=public --add-port=80/tcp --permanent
Reload the firewall.
sudo firewall-cmd --reload
Create a "nagiosadmin" user and remember the password you assign.
sudo htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
Start the web server.
sudo systemctl start httpd.service
Start the Nagios service.
sudo systemctl start nagios.service
Check that the web server is running.
sudo systemctl status httpd
Check that Nagios is running
sudo systemctl status nagios
Open up a browser and navigate to the public IP address provided in the lab instructions. Attempt to login using
nagiosadminand the password you supplied in a previous step.
Add Nagios Plugins
Install necessary prerequisites.
sudo yum install -y gcc glibc glibc-common make gettext automake autoconf wget openssl-devel net-snmp net-snmp-utils epel-release unzip perl-Net-SNMP
Download the plugins.
Unzip the file.
Nagivate to the appropriate directory.
Compile the necessary files.
sudo make sudo make install
sudo systemctl restart nagios
Switch back to your browser and refresh it. Click on Hosts in the left-hand menu.
Congratulations — you've completed this hands-on lab!