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.

[[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

Nagios Dashboard

Host View
Nagios Host View

Nagios Host View

Nagios Overview
Nagios Overview

Nagios Overview

Services View
Nagios Host Services

Nagios Host Services

Process View
Nagios 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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403 Responses

  1. Shankar M V says:

    When I run the command “systemctl start httpd.service“. It shows the following error “Job for httpd.service failed because the control process exited with error code. See “systemctl status httpd.service” and “journalctl -xe” for details.”

    Can anyone please help for the same…

  2. Manikandan says:
    # make install-commandmode
    /usr/bin/install -c -m 775 -o nagios -g nagcmd -d /usr/local/nagios/var/rw
    
    # chmod g+s /usr/local/nagios/var/rw
    
    *** External command directory configured ***
    
    # make install-config
    /usr/bin/install -c -m 775 -o nagios -g nagios -d /usr/local/nagios/etc
    /usr/bin/install: invalid group ‘nagios’
    make: *** [install-config] Error 1
    -bash-4.2# 
    

    During nagios core installation steps I got the above error, I have created the group already

    # useradd -m nagios
    useradd: user 'nagios' already exists
    # groupadd nagcmd
    groupadd: group 'nagcmd' already exists
    # usermod -a -G nagcmd nagios
    # usermod -a -G nagcmd apache
    # pwd
    

    Please advise to proceed further

  3. Ganesh joshi says:

    Sir, when i am doing http://my-ip/nagios it gives internal server error and if i read log on tail -f /var/log/httpd/error_log it says the there is not any index.html and .php file.

    Pleas help…..

  4. Rashid says:

    All installation fine, the problem when accessing the nagios on browser.

    servername/nagios
    Error
    Forbidden
    You Don't have permission to aces /nagios/on this server.
    

    Kindly assist?

    • Ravi Saive says:

      @Rashid,

      It’s something SELinux preventing from the accessing the nagios page, try to set SELinux to permissive mode, you can use the following command to set:

      # chcon -R -t httpd_sys_content_t /usr/local/nagios/sbin/
      # chcon -R -t httpd_sys_content_t /usr/local/nagios/share/
      

      Don’t forget to restart the Apache service..

  5. ashish says:

    Hi,

    I am also new to Linux. I am also having same problem as you mention in your first comment. Can you please mention the details about port forwarding. I have installed nagios on server . I am getting error of 404 not found.

    Please help.
    Thank you.

  6. James says:

    Hello.

    I try to set up this nagios service but, well when it asks me user and password I provide “nagiosadmin” and “password“. Nevertheless I can’t access the web interface.

    Would you provide me the right username and password please?

    James

    • Ravi Saive says:

      @James,

      Run this following command to set new password again for Nagios admin.

      htpasswd -s -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
      
      • sam says:

        Hi, After running the above command, I get the output like.

        htpasswd: cannot create file /usr/local/nagios/etc/htpasswd.users
        

        what should I do?

        • Ravi Saive says:

          @Sam,

          Try to disable SELinux and try again or create file htpasswd.users manually and run the command again.

          # htpasswd -c /usr/local/nagios/etc/htpasswd.users
          
  7. VA says:

    Hi,

    I am a beginner with Linux and network monitoring tools. I am installing Nagios 4.3.4 on CentOS 7. I followed the instructions posted here however, I cannot access the web interface. Should I have modified some config file to provide the IP address of my machine/server, please? Could you please point me towards things which I could check?

    Thank you.

    • Ravi Saive says:

      @Vanessa,

      Could you tell us what error you getting while accessing Nagios web interface?

      • VA says:

        Hi Ravi,

        Thank you for your prompt reply!

        I was getting the ‘This site can’t be reached’ error on Google Chrome upon trying to access the Nagios web interface via http://10.0.2.15. However, I managed to solve this. I had forgotten to mention that I installed Nagios on a virtual machine on PC. The problem that I was having was due to a port forwarding issue it seems. I set up port forwarding (for port 80) from the VM to the PC and now everything works just fine :)

        Thank you for your help and interest!

        • na says:

          Hi I got an error the same as you. I try to do many things still not help.

          I disabled SElinux
          add port “12489 ” in firwalld.
          and after check i found the problem when i start
          ==================================================
          [[email protected] ~]# systemctl enable nagios
          nagios.service is not a native service, redirecting to /sbin/chkconfig.
          Executing /sbin/chkconfig nagios on
          The unit files have no [Install] section. They are not meant to be enabled
          using systemctl.
          Possible reasons for having this kind of units are:
          1) A unit may be statically enabled by being symlinked from another unit’s
          .wants/ or .requires/ directory.
          2) A unit’s purpose may be to act as a helper for some other unit which has
          a requirement dependency on it.
          3) A unit may be started when needed via activation (socket, path, timer,
          D-Bus, udev, scripted systemctl call, …).
          ======================================================
          ==>> can anyone help me?!

  8. shuja says:

    Dear Ravi,

    I did the same as you said in this file /usr/local/nagios/etc/nagios.cfg but no luck still service not running see the logs below

    Stopping LSB: Starts and stops the Nagios monitoring server…
    Jan 11 11:47:11 nagiosserver1 nagios: Stopping nagios:/etc/rc.d/init.d/nagios: line 140: kill: (1194) – No such process
    Jan 11 11:47:11 nagiosserver1 nagios: done.
    Jan 11 11:47:11 nagiosserver1 systemd: Starting LSB: Starts and stops the Nagios monitoring server…
    Jan 11 11:47:11 nagiosserver1 nagios: Nagios 4.1.1 starting… (PID=2746)
    Jan 11 11:47:11 nagiosserver1 nagios: Starting nagios: done.
    Jan 11 11:47:11 nagiosserver1 systemd: Started LSB: Starts and stops the Nagios monitoring server.
    Jan 11 11:47:12 nagiosserver1 nagios: Local time is Thu Jan 11 11:47:11 +03 2018
    Jan 11 11:47:12 nagiosserver1 nagios: LOG VERSION: 2.0
    Jan 11 11:47:12 nagiosserver1 nagios: qh: Failed to init socket ‘/usr/local/nagios/var/rw/nagios.qh’. bind() failed: No such file or directory
    Jan 11 11:47:12 nagiosserver1 nagios: Error: Failed to initialize query handler. Aborting

  9. shuja says:

    @ravi

    I have verified nagios configuration as per your above process configuration is all OK. but in my nagios web URL on homepage i am getting a message “nagios core not running” it is not showing nagios running with PID. in TOP command result also there no PID associated to nagios.

    please find below commands outputs

    [[email protected] ~]# systemctl status nagios
    ● nagios.service - LSB: Starts and stops the Nagios monitoring server
       Loaded: loaded (/etc/rc.d/init.d/nagios; bad; vendor preset: disabled)
       Active: active (exited) since Tue 2018-01-09 19:26:59 +03; 13h ago
         Docs: man:systemd-sysv-generator(8)
      Process: 4467 ExecReload=/etc/rc.d/init.d/nagios reload (code=killed, signal=T                                                                                        ERM)
      Process: 4926 ExecStart=/etc/rc.d/init.d/nagios start (code=exited, status=0/S                                                                                        UCCESS)
    
    Jan 09 19:26:59 nagiosserver1 systemd[1]: Starting LSB: Starts and stops the....
    Jan 09 19:26:59 nagiosserver1 systemd[1]: Started LSB: Starts and stops the ....
    Jan 09 19:26:59 nagiosserver1 nagios[4926]: Starting nagios: done.
    Hint: Some lines were ellipsized, use -l to show in full.
    
    [[email protected] ~]# service nagios status
    nagios is not running
    
    [[email protected] ~]# df -h
    Filesystem               Size  Used Avail Use% Mounted on
    /dev/mapper/centos-root  4.9G  3.7G  1.2G  76% /
    devtmpfs                 473M     0  473M   0% /dev
    tmpfs                    489M     0  489M   0% /dev/shm
    tmpfs                    489M  7.2M  482M   2% /run
    tmpfs                    489M     0  489M   0% /sys/fs/cgroup
    /dev/sda1                297M  144M  154M  49% /boot
    /dev/mapper/centos-var   997M  509M  488M  52% /var
    /dev/sr0                 4.3G  4.3G     0 100% /run/media/root/CentOS 7 x86_64
    tmpfs                     98M     0   98M   0% /run/user/0
    [[email protected] ~]#
    

    Please also see below logs while restarting nagios service these logs are generated.

     systemd: Starting LSB: Starts and stops the Nagios monitoring server...
    Jan 10 09:13:49 nagiosserver1 nagios: Nagios 4.1.1 starting... (PID=8415)
    Jan 10 09:13:49 nagiosserver1 nagios: Local time is Wed Jan 10 09:13:49 +03 2018
    Jan 10 09:13:49 nagiosserver1 nagios: LOG VERSION: 2.0
    Jan 10 09:13:49 nagiosserver1 nagios: qh: Failed to init socket '/usr/local/nagios/var/rw/nagios.qh'. 
    bind() failed: No such file or directory
    Jan 10 09:13:49 nagiosserver1 nagios: Error: Failed to initialize query handler. Aborting
    Jan 10 09:13:50 nagiosserver1 systemd: Started LSB: Starts and stops the Nagios monitoring server.
    Jan 10 09:13:50 nagiosserver1 nagios: Starting nagios: done.
    

    Please note i am running this in vmware on centos 7

    • Ravi Saive says:

      @Shuja,

      It seems to me a bug in Nagios version, you can fix this issue by adding a following line to your nagios.cfg and then restarting nagios.

      query_socket=/usr/local/nagios/var/rw/nagios.qh
      

      And the restart:

      # service nagios restart
      

      If it’s still showing same error, you can check this thread about this bug for solutions – https://bugzilla.redhat.com/show_bug.cgi?id=1291718

  10. shuja says:

    my all configuration is OK but on nagios web page it is showing nagios core not running. can you please help?

    • Ravi Saive says:

      @Shuja,

      Could you share exact error message with us? so that we can have better idea. Also have you verified your nagios configuration?

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