How to Install Nagios 4.4.5 on RHEL/CentOS 8/7 and Fedora 30

Nagios is an awesome Open Source monitoring tool, it provides you more comprehensive monitoring environment to always keep an eye on your all machines/networks whether you are in your data center or just your small labs.

With Nagios, you can monitor your remote hosts and their services remotely on a single window. It shows warnings and indicates if something goes wrong in your servers which eventually helps us to detect some problems before they occur. It helps us to reduce downtime and business losses.

Recently, Nagios released its latest versions Nagios Core 4.4.5 and its latest stable release of Nagios plugins 2.2.1 on August 20, 2019.

This article is intended to guide you with easy instructions on how to install the latest Nagios Core 4.4.5 from source (tarball) on RHEL 8/7/6, CentOS 8/7/6 and Fedora 26-30 distributions.

Within 30 minutes you will be monitoring your local machine, no advanced installation procedure only basic installation that will work 100% on most of today’s Linux servers.

Please Note: The installation instructions were shown in here are written based on CentOS 7.5 Linux distribution.

Installing Nagios 4.4.5 and Nagios Plugin 2.2.1

If you follow these instructions correctly, you will end up with the following information.

  1. Nagios and its plugins will be installed under /usr/local/nagios directory.
  2. Nagios will be configured to monitor few services of your local machine (Disk Usage, CPU Load, Current Users, Total Processes, etc.)
  3. Nagios web interface will be available at http://localhost/nagios

Step 1: Install Required Dependencies

We need to install Apache, PHP and some libraries like gcc, glibc, glibc-common and GD libraries and its development libraries before installing Nagios 4.4.5 with the source. And to do so, we can use yum default package installer.

[[email protected]]# yum install -y httpd httpd-tools php gcc glibc glibc-common gd gd-devel make net-snmp
 
 -------------- On Fedora -------------- 
 [[email protected]]# dnf install -y httpd httpd-tools php gcc glibc glibc-common gd gd-devel make net-snmp

Step 2: Create Nagios User and Group

Create a new nagios user using useradd command and nagcmd group account and set a password.

[[email protected]]# useradd nagios
 [[email protected]]# groupadd nagcmd

Next, add both the nagios user and the apache user to the nagcmd group using usermod command.

[[email protected]]# usermod -G nagcmd nagios
 [[email protected]]# usermod -G nagcmd apache

Step 3: Download Nagios Core 4.4.5 and Nagios Plugin 2.2.1

Create a directory for your Nagios installation and all its future downloads.

[ro[email protected]]# mkdir /root/nagios
 [[email protected]]# cd /root/nagios

Now download latest Nagios Core 4.4.5 and Nagios plugins 2.2.1 packages with wget command.

[[email protected] nagios~]# wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.5.tar.gz
 [[email protected] nagios~]# wget https://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz
 

Step 4: Extract Nagios Core and its Plugins

We need to extract downloaded packages with tar command as follows.

[[email protected] nagios~]# tar -xvf nagios-4.4.5.tar.gz
 [[email protected] nagios~]# tar -xvf nagios-plugins-2.2.1.tar.gz

When you extract these tarballs with tar command, two new folders will appear in that directory.

[[email protected] nagios ~]# ls -l
 total 13520
 drwxrwxr-x 18 root root 4096 Aug 20 17:43 nagios-4.4.5
 -rw-r--r-- 1 root root 11101966 Aug 20 17:48 nagios-4.4.5.tar.gz
 drwxr-xr-x 15 root root 4096 Apr 19 12:04 nagios-plugins-2.2.1
 -rw-r--r-- 1 root root 2728818 Apr 19 12:04 nagios-plugins-2.2.1.tar.gz
 

Configure Nagios Core

Now, first we will configure Nagios Core and to do so we need to go to Nagios directory and run configure file and if everything goes fine, it will show the output in the end as sample output. Please see below.

[[email protected] nagios~]# cd nagios-4.4.5/
 [[email protected] nagios-4.4.5 ]# ./configure --with-command-group=nagcmd
Sample output:
Creating sample config files in sample-config/ ...
 
 
 *** Configuration summary for nagios 4.4.5 2019-08-20 ***:
 
 General Options:
 -------------------------
 Nagios executable: nagios
 Nagios user/group: nagios,nagios
 Command user/group: nagios,nagcmd
 Event Broker: yes
 Install ${prefix}: /usr/local/nagios
 Install ${includedir}: /usr/local/nagios/include/nagios
 Lock file: /run/nagios.lock
 Check result directory: /usr/local/nagios/var/spool/checkresults
 Init directory: /lib/systemd/system
 Apache conf.d directory: /etc/httpd/conf.d
 Mail program: /usr/bin/mail
 Host OS: linux-gnu
 IOBroker Method: epoll
 
 Web Interface Options:
 ------------------------
 HTML URL: http://localhost/nagios/
 CGI URL: http://localhost/nagios/cgi-bin/
 Traceroute (used by WAP): /usr/bin/traceroute
 
 
 Review the options above for accuracy. If they look okay,
 type 'make all' to compile the main program and CGIs.
 

After configuring, we need to compile and install all the binaries with make all and make install command, it will install all the needed libraries in your machine and we can proceed further.

[[email protected] nagios-4.4.5 ]# make all
 [[email protected] nagios-4.4.5 ]# make install
Sample output:
*** Compile finished ***
 
 If the main program and CGIs compiled without any errors, you
 can continue with testing or installing Nagios as follows (type
 'make' without any arguments for a list of all possible options):
 
 make test
 - This runs the test suite
 
 make install
 - This installs the main program, CGIs, and HTML files
 
 make install-init
 - This installs the init script in /lib/systemd/system
 
 make install-daemoninit
 - This will initialize the init script
 in /lib/systemd/system
 
 make install-groups-users
 - This adds the users and groups if they do not exist
 
 make install-commandmode
 - This installs and configures permissions on the
 directory for holding the external command file
 
 make install-config
 - This installs *SAMPLE* config files in /usr/local/nagios/etc
 You'll have to modify these sample files before you can
 use Nagios. Read the HTML documentation for more info
 on doing this. Pay particular attention to the docs on
 object configuration files, as they determine what/how
 things get monitored!
 
 make install-webconf
 - This installs the Apache config file for the Nagios
 web interface
 
 make install-exfoliation
 - This installs the Exfoliation theme for the Nagios
 web interface
 
 make install-classicui
 - This installs the classic theme for the Nagios
 web interface
 

The following command will install the init scripts for Nagios.

[[email protected] nagios-4.4.5 ]# make install-init

To make Nagios work from command line we need to install command-mode.

[[email protected] nagios-4.4.5 ]# make install-commandmode

Next, install sample Nagios files, please run following command.

[[email protected] nagios-4.4.5 ]# make install-config
Sample output:
/usr/bin/install -c -m 775 -o nagios -g nagios -d /usr/local/nagios/etc
 /usr/bin/install -c -m 775 -o nagios -g nagios -d /usr/local/nagios/etc/objects
 /usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/nagios.cfg /usr/local/nagios/etc/nagios.cfg
 /usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/cgi.cfg /usr/local/nagios/etc/cgi.cfg
 /usr/bin/install -c -b -m 660 -o nagios -g nagios sample-config/resource.cfg /usr/local/nagios/etc/resource.cfg
 /usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/templates.cfg /usr/local/nagios/etc/objects/templates.cfg
 /usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/commands.cfg /usr/local/nagios/etc/objects/commands.cfg
 /usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/contacts.cfg /usr/local/nagios/etc/objects/contacts.cfg
 /usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/timeperiods.cfg /usr/local/nagios/etc/objects/timeperiods.cfg
 /usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/localhost.cfg /usr/local/nagios/etc/objects/localhost.cfg
 /usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/windows.cfg /usr/local/nagios/etc/objects/windows.cfg
 /usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/printer.cfg /usr/local/nagios/etc/objects/printer.cfg
 /usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/switch.cfg /usr/local/nagios/etc/objects/switch.cfg
 
 *** Config files installed ***
 
 Remember, these are *SAMPLE* config files. You'll need to read
 the documentation for more information on how to actually define
 services, hosts, etc. to fit your particular needs.
 

Step 5: Customizing Nagios Configuration

Open the “contacts.cfg” file with your choice of editor and set the email address associated with the nagiosadmin contact definition to receiving email alerts.

# vi /usr/local/nagios/etc/objects/contacts.cfg
Sample Output
###############################################################################
 ###############################################################################
 #
 # CONTACTS
 #
 ###############################################################################
 ###############################################################################
 
 # Just one contact defined by default - the Nagios admin (that's you)
 # This contact definition inherits a lot of default values from the 'generic-contact'
 # template which is defined elsewhere.
 
 define contact{
 contact_name nagiosadmin ; Short name of user
 use generic-contact ; Inherit default values from generic-contact template (defined above)
 alias Nagios Admin ; Full name of user
 
 email [email protected] ; *** CHANGE THIS TO YOUR EMAIL ADDRESS ****
 }

Step 6: Install and Configure Web Interface for Nagios

We are done with all configuration in the backend, now we will configure Web Interface For Nagios with the following command. The below command will Configure Web interface for Nagios and a web admin user will be created “nagiosadmin”.

[[email protected] nagios-4.4.5 ]# make install-webconf

In this step, we will be creating a password for “nagiosadmin”. After executing this command, please provide a password twice and keep it remember because this password will be used when you login in the Nagios Web interface.

[[email protected] nagios-4.4.5]# htpasswd -s -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
 New password:
 Re-type new password:
 Adding password for user nagiosadmin

Restart Apache to make the new settings take effect.

[[email protected] nagios-4.4.5]# service httpd start [On RHEL/CentOS 6]
 [[email protected] nagios-4.4.5]# systemctl start httpd.service [On RHEL/CentOS 7/8 and Fedora]
 

Step 7: Compile and Install Nagios Plugin

We have downloaded Nagios plugins in /root/nagios, Go there and configure and install it as directed below.

[[email protected] nagios-4.4.5]# cd /root/nagios
 [[email protected] nagios]# cd nagios-plugins-2.2.1/
 [[email protected] nagios-plugins-2.2.1]# ./configure --with-nagios-user=nagios --with-nagios-group=nagios
 [[email protected] nagios-plugins-2.2.1]# make
 [[email protected] nagios-plugins-2.2.1]# make install

Step 8: Verify Nagios Configuration Files

Now we are all done with Nagios configuration and its time to verify it and to do so please insert following command. If everything goes smooth it will show up similar to below output.

[[email protected] nagios]# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
Sample Output
Nagios Core 4.4.5
 Copyright (c) 2009-present Nagios Core Development Team and Community Contributors
 Copyright (c) 1999-2009 Ethan Galstad
 Last Modified: 2019-08-20
 License: GPL
 
 Website: https://www.nagios.org
 Reading configuration data...
 Read main config file okay...
 Read object config files okay...
 
 Running pre-flight check on configuration data...
 
 Checking objects...
 Checked 8 services.
 Checked 1 hosts.
 Checked 1 host groups.
 Checked 0 service groups.
 Checked 1 contacts.
 Checked 1 contact groups.
 Checked 24 commands.
 Checked 5 time periods.
 Checked 0 host escalations.
 Checked 0 service escalations.
 Checking for circular paths...
 Checked 1 hosts
 Checked 0 service dependencies
 Checked 0 host dependencies
 Checked 5 timeperiods
 Checking global event handlers...
 Checking obsessive compulsive processor commands...
 Checking misc settings...
 
 Total Warnings: 0
 Total Errors: 0
 
 Things look okay - No serious problems were detected during the pre-flight check
 

Step 9: Add Nagios Services to System Startup

To make Nagios work across reboots, we need to add nagios and httpd with chkconfig and systemctl command.

On RHEL/CentOS 6
[[email protected] ]# chkconfig --add nagios
 [[email protected] ]# chkconfig --level 35 nagios on
 [[email protected] ]# chkconfig --add httpd
 [[email protected] ]# chkconfig --level 35 httpd on
On RHEL/CentOS 7/8 and Fedora
[[email protected] ]# systemctl enable nagios
 [[email protected] ]# systemctl enable httpd
 

Restart Nagios to make the new settings take effect.

[[email protected] ]# service nagios start [On RHEL/CentOS 6]
 [[email protected] ]# systemctl start nagios.service [On RHEL/CentOS 7/8 and Fedora]
 

Step 10: Login to the Nagios Web Interface

Your Nagios is ready to work, please open it in your browser with “http://Your-server-IP-address/nagios” or “http://FQDN/nagios” and Provide the username “nagiosadmin” and password.

Nagios Web Dashboard
Nagios Dashboard
Host View
Nagios Host View
Nagios Overview
Nagios Overview
Services View
Nagios Host Services
Process View
Nagios Process View

Congratulations! You’ve successfully installed and configured Nagios and its Plugins. You’ve just started your journey into monitoring.

Upgrade Nagios 3.x to Nagios 4.4.5

If you are already running an older version of Nagios, you can upgrade it anytime. To do so, you just need to download the latest tar archive of it and configure it as shown below.

[[email protected] ]# service nagios stop
 [[email protected] ]# wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.5.tar.gz
 [[email protected] ]# tar -zxvf nagios-4.4.5.tar.gz
 [[email protected] ]# cd nagios-4.4.5
 [[email protected] ]# ./configure
 [[email protected] ]# make all
 [[email protected] ]# make install
 [[email protected] ]# service nagios start

That’s it for now, in my upcoming articles, I will show you how to add Linux, Windows, Printers, Switches, and Devices to Nagios monitoring Server. If you’re having any trouble while installing, please do contact us via comments. Till then stay tuned and connected to Tecmint and don’t forget to Like and Share us to spread around.

Read Also:

  1. How to Add Linux Host to Nagios Monitoring Server
  2. How to Add Windows Host to Nagios Monitoring Server
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417 thoughts on “How to Install Nagios 4.4.5 on RHEL/CentOS 8/7 and Fedora 30”

  1. Hello,

    Please provide documentation for monitoring the docker container working on a Linux remote host using Nagios.

    Reply
  2. Hi, I am trying to test it on an AWS Ec2 instance, at step 10, it’s not working. I have opened all the security groups also.

    When entering only my Pub IP in the browser, it’s loading to a web-page, but not with /nagios, below error I am seeing,

    http://PUBLICIP/nagios Not Found The requested URL was not found on this server. 

    Thanks

    Reply
  3. There is one step is missing in the above guide. You need to add the port 80 in the firewall otherwise you unable to access it via web console.

    # firewall-cmd --zone=public --add-port=80/tcp --permanent # firewall-cmd --reload 
    Reply
  4. Hi, unable to add Nagios (step 9) after verifying the Nagios configuration files. Got the error Failed to issue method call: No such file or directory.

    Reply
    • The first time is also stuck with the same error then I found that you can use the second screenshot commands in STEP 9.

      I was successfully complete the configuration with below mentioned commands in step 9

      [[email protected] ]# systemctl enable nagios [[email protected] ]# systemctl enable httpd 

      Restart Nagios to make the new settings take effect.

      [[email protected] ]# service nagios start [On RHEL/CentOS 6] [[email protected] ]# systemctl start nagios.service [On RHEL/CentOS 7/8 and Fedora] 
      Reply
  5. Hi Ravi,

    I am not able to login in to Nagios from my local network, outside of the VM machine. Would you please tell me where I need to allow please send me the code. thanks

    Reply
  6. When I visit “http://ip-addr“, I can see the page of Apache. But I visit “http://ip-addr/nagios“, I can not see anything.

    I don’t know where is the problem. Please tell me, thanks!

    Reply
  7. Did everything as above mentioned but getting the below error at the final Verification Nagios Configuration Files

    Website: https://www.nagios.org
    Reading configuration data…
    Read main config file okay…
    Error: Unexpected token or statement in file ‘/usr/local/nagios/etc/objects/contacts.cfg’ on line 22.
    Error processing object config files!

    Reply
    • @Mohammed,

      Open your /usr/local/nagios/etc/objects/contacts.cfg file and look for line 22, there might be some error..

      Reply

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