How to Install Nagios 4.4 (Monitoring Server) on CentOS/RHEL 7/6

Updated on June 27, 2018 by
Nagios , ,

Nagios is the most popular, open source, powerful monitoring system. It enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes. Nagios has the capability of monitoring application, services, entire IT infrastructure.

Install Nagios Core

This is Part-1 of complete article How to Setup Nagios Monitoring Server with NagiosQL on CentOS/RHEL 7/6, In this part, you will find the steps to setup Nagios Monitoring Server on CentOS, Redhat, and Fedora systems.

Step 1 – Install Required Packages

We assume that you have fresh installed CentOS, Red Hat or Fedora systems, So our first requirement is to install Apache and PHP first. Use the following commands to complete it. You can find detailed LAMP setup instruction here.

Install Packages:

yum install httpd php php-cli gcc glibc glibc-common gd gd-devel net-snmp

Start Services:

service httpd start

Step 2 – Setup User Accounts

Now create a new nagios user account and setup a password to this account

useradd nagios
passwd nagios

Now create a groud for nagios setup “nagcmd” and add nagios user to this group. Also add nagios user in apache group.

groupadd nagcmd
usermod -a -G nagcmd nagios
usermod -a -G nagcmd apache

Step 3 – Install Nagios Core Service

After installing required dependencies and adding user accounts. Let’s start with Nagios core installation. Download latest Nagios core service from the official site.

cd /opt/
wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.1.tar.gz
tar xzf nagios-4.4.1.tar.gz
cd nagios-4.4.1
./configure --with-command-group=nagcmd
make all
make install
make install-init
make install-config
make install-commandmode

Now use below command to setup apache configuration for Nagios installation.

make install-webconf

Step 4 – Configure Apache Authentication

We need to setup apache authentication for user nagiosadmin. Do not change this username. else you would required more changes in configuration.

htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

Now restart Apache service to make the new settings take effect.

service httpd restart

Step 5 – Install Nagios Plugins

After installing and configuring Nagios core service, Download latest nagios-plugins source and install using following commands.

cd /opt
wget http://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz
tar xzf nagios-plugins-2.2.1.tar.gz
cd nagios-plugins-2.2.1

Now compile and install nagios plugins

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

Step 6 – Verify and Start Nagios

First, verify the Nagios configuration file using the following command.

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

If there are not error, lets start the Nagios serivce

service nagios start
chkconfig --add nagios
chkconfig nagios on

Step 7 – Access Nagios in Web Browser

Nagios creates its own apache configuration file /etc/httpd/conf.d/nagios.conf. There are no need to make any changes to it. Simply open below url in browser.
[change domain name with your domain or ip]

 http://test.tecadmin.net/nagios/

Prompting for Apache Authentication Password –

Nagios After login screen –

Now you have successfully installed and configured Nagios core service in your system. Now go to article install NagiosQL3 web interface for managing Nagios.

Rahul K.
Rahul K.
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I, Rahul Kumar am the founder and chief editor of TecAdmin.net. I am a Red Hat Certified Engineer (RHCE) and working as an IT professional since 2009..

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46 Comments

  1. Nirbhay Reply to Nirbhay
    September 4, 2018 at 5:24 am

    Hi I followed all lines.
    While i was writing command make make all
    got error “make: *** No rule to make target `all’. Stop.”
    make utility allready installed.
    Please help in this.

  2. serge Reply to serge
    July 12, 2017 at 9:55 am

    hi i am serge
    i have install nagios properly when i run nagios.service i have this message “job for nagios.service failed because the control process exited with error code” thanks for your help

  3. Yuga Reply to Yuga
    June 8, 2016 at 8:54 am

    i am getting Authorization Required problem

  4. srinivas Reply to srinivas
    May 19, 2016 at 12:06 pm

    Hi Team,

    I installed Nagios on Linux, with all the steps as mentioned above. but while logging I am not able to login. getting error like
    ” Authorization Required

    This server could not verify that you are authorized to access the document requested. Either you supplied the wrong credentials (e.g., bad password), or your browser doesn’t understand how to supply the credentials required.

    Apache/2.2.15 (Red Hat) Server at 172.29.218.194 Port 80″

    Can some one help on this please.

  5. bilal malik Reply to bilal
    December 10, 2015 at 8:54 am

    i have gone through all the commands its open login page where i put the user nagioadmin and password i gave at the time of creation on user, but the user is not authenticated, please tell me whats error. i have changed the password of this user as well but go not log in.

    please tell

  6. Srikanth Reddy Reply to Srikanth
    November 12, 2015 at 11:53 am

    Very good notes

    and i have one question

    if you create a two user u1 and u2
    and first log in to u1 and without logout
    try to log in to u2 it is asking some password
    by defualt what password it is tacking can you please solve this query….

  7. warren Reply to warren
    October 6, 2015 at 12:36 pm

    Complete steps! – installed on CentOS 6 x64 after much trying and reading…

    Nagios Centos Install

    # rpm -Uvh http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
    # rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
    yum –enablerepo=remi install httpd
    service httpd start
    chkconfig httpd on
    sudo rpm -Uvh http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
    yum install mysql mysql-server
    service mysqld start
    yum install php php-mysql
    yum install php-common php-cli php-mysql php-devel
    service httpd restart
    service mysqld restart
    yum install httpd php php-cli gcc glibc glibc-common gd gd-devel net-snmp
    service httpd start
    useradd nagios
    passwd nagios

    ​ Step 2: Setup User Accounts
    Now create a new nagios user account and setup a password to this account
    # useradd nagios
    # passwd nagios
    Now create a groud for nagios setup “nagcmd” and add nagios user to this group. Also add nagios user in apache group.
    # groupadd nagcmd
    # usermod -a -G nagcmd nagios
    # usermod -a -G nagcmd apache
    ​ Step 3: Install Nagios Core Service
    After installing required dependencies and adding user accounts. Lets start with Nagios core installation. Download latest nagios core service from official site.
    # cd /opt/
    # wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.0.8.tar.gz
    # tar xzf nagios-4.0.8.tar.gz
    # cd nagios-4.0.8
    # ./configure –with-command-group=nagcmd
    # make all
    # make install
    # make install-init
    # make install-config
    # make install-commandmode
    Now use below command to setup apache configuration for Nagios installation.
    # make install-webconf
    ​ Step 4: Configure Apache Authentication
    We need to setup apache authentication for user nagiosadmin. Do not change this username. else you would required more changes in configuration.
    # htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
    Now restart Apache service to make the new settings take effect.
    # service httpd restart
    ​ Step 5: Install Nagios Plugins
    After installing and configuring Nagios core service, Download latest nagios-plugins source and install using following commands.
    # cd /opt
    # wget http://nagios-plugins.org/download/nagios-plugins-2.0.3.tar.gz
    # tar xzf nagios-plugins-2.0.3.tar.gz
    # cd nagios-plugins-2.0.3
    Now compile and install nagios plugins
    # ./configure –with-nagios-user=nagios –with-nagios-group=nagios
    # make
    # make install
    ​ Step 6: Verify and Start Nagios
    Use the following commands to verify nagios install and start nagios core service.
    # /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
    # service nagios start
    Also configure nagios service to start on system start
    # chkconfig –add nagios
    # chkconfig nagios on
    firewall-cmd –add-port=80/tcp –permanent

    # vim /etc/sysconfig/selinux
    SELINUX=disabled

    REBOOT SERVER.

    Service mysqld start
    service https start
    service nagios start

    Logon on to nagios from web brower!

  8. Hosney Osman Reply to Hosney
    July 14, 2015 at 9:51 am

    it’s not comment
    thank you so much for your effort writing this article
    i want to say unzip is a mandatory package for installation

  9. Constantin Reply to Constantin
    May 5, 2015 at 9:31 am

    Hello Rahul,
    i have a question,
    why we have to install apache and not nginx? (I am not asking the differences between them) but it has to do with the nagios program? e.g isn’t compatible or something like that?

  10. Rashid Samoo Reply to Rashid
    April 26, 2015 at 9:15 am

    Successfully Installed through follow your steps. but what is the main benefit for to install nagios ?

    • Mandar Reply to Mandar
      May 25, 2015 at 8:08 am

      With Nagios, you can monitor your entire infrastructure (critical servers and network components) with ease, on a web interface. In case anything goes wrong, you receive a notification and the issue gets addressed in timely manner.

      And best thing is that, Nagios Core is Free and Open Source, so you can customize it as per your needs.

      Thanks.

  11. Milton Reply to Milton
    January 24, 2015 at 7:43 pm

    I followed the steps and it works the only issue I had it was:
    Permission denied: exec of ‘/usr/local/nagios/sbin/statusjson.cgi’ failed, referer: http://myserver/nagios/main.php
    I fixed with
    chcon -R -t httpd_sys_content_t /usr/local/nagios

    Thanks

  12. Seokwon Reply to Seokwon
    November 14, 2014 at 2:51 am

    Hi
    I finish all progress . but I can’t see local host status
    Current, My nagios web page show the message ‘unable to get process status’
    Do you know this problem?

  13. Sanjay Reply to Sanjay
    November 7, 2014 at 11:57 am

    I am getting this error when i am trying to open via browser

    Forbidden

    You don’t have permission to access /nagios on this server.

  14. Steve Reply to Steve
    October 19, 2014 at 4:49 pm

    Hi,

    We are trying to install this, and all went well – but on the homepage we get an error saying “Unable to get process status” and no other page will load – internal server error.

    Steve

    • Jonathan Reply to Jonathan
      December 7, 2014 at 7:09 pm

      I had this problem as well. Try the selinux suggestion above. When things don’t work and you did everything right with no errors, for me 9 times out of 10 the problem is selinux. I try to remember to try this first now.

  15. Ajit Reply to Ajit
    August 28, 2014 at 9:34 am

    Hello,
    I have followed these steps and it is successfully installed on my VM (CentOS) and everything was fine but next day when I again poweered on my VM and tried to take web access it gives me an error I have checked nagios service and process as well but no use I’m not able to get my web access
    any one can help…

  16. muhammad farooq Reply to muhammad
    August 22, 2014 at 9:44 pm

    “” FACING PROBLEM WITH FOLLOWING ERROR”
    make[1]: Leaving directory `/opt/nagios-plugins-2.0.3/po’
    make[1]: Entering directory `/opt/nagios-plugins-2.0.3′
    make[2]: Entering directory `/opt/nagios-plugins-2.0.3′
    make[2]: Nothing to be done for `install-exec-am’.
    make[2]: Nothing to be done for `install-data-am’.
    make[2]: Leaving directory `/opt/nagios-plugins-2.0.3′
    make[1]: Leaving directory `/opt/nagios-plugins-2.0.3′
    [[email protected] nagios-plugins-2.0.3]# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
    bash: /usr/local/nagios/bin/nagios: No such file or directory
    <

  17. Thomaz Reply to Thomaz
    August 21, 2014 at 9:51 am

    If you have SELinux enabled then you need to run:
    chcon -R -t httpd_sys_content_t /usr/local/nagios

  18. Rudy H Reply to Rudy
    August 14, 2014 at 1:52 pm

    When accessing the nagios weblink http:///nagios I am receiving

    403 Forbidden
    You don’t have permission to access /nagios on this server.

    Any ideas on how to fix this issue?

  19. Ronald Reply to Ronald
    August 3, 2014 at 1:25 am

    It works GREAT and thanks however, when i reboot the server nagios does not start back up.

    I have doen theis on CentOS 6.5 then 7 same results.

    Please help.

  20. Naresh Bhanushali Reply to Naresh
    November 19, 2013 at 2:37 pm

    Hi Rahul,

    Recently, I just deleted my /etc/passwd and /etc/group file in my nagios server. Luckily, I restored it from the backup I had. But after that, I am not able to import data to remote nagios server over SSH/SFTP using nagiosql.
    I can login directly without password from local system to remote system, but getting error for permission check. I have also tried to change ownership to apache user and nagios user vice-versa. But no use. Do you have exact idea where should I be wrong going as unluckily, I had restarted the corrupted slave simnagios and due to that getting stale results.

  21. Hubalda Reply to Hubalda
    October 25, 2013 at 10:06 am

    I have problem with NagiosQL3 Web Installer.

    Please, help me
    Thanks

  22. Shaun Reply to Shaun
    September 5, 2013 at 1:31 pm

    thanks for the tutorial bro ; )

  23. Jon Reply to Jon
    August 28, 2013 at 7:49 pm

    I’ve gone through all your steps several times and it still doesn’t work. I can navigate to the site “Settings file not found or not readable (config/settings.php). Upgrade not available!” When i click the Start installation it says “SSH2: Not Available”, “MySQL: Not Available”, “date.timezon: Not Available (cannot be empty and needs to be set)”, “Write test on settings directory (config/): failed”

    Now i’ve installed all of these programs and started/added to services. I’ve edited the php.ini file to have America/Denver as my timezone. I’ve disable the iptables to make sure somethings not being blocked.

    Do you have any input on how i can solve this. Any assistance would be much appreciated.

    • Rahul K. Rahul Reply to Rahul
      August 29, 2013 at 4:34 am

      Hi Jon,

      1. make sure you have assigned privileges to apache user on config directory
      2. To install SSH2 use below commands.
      # yum install libssh2-devel libssh2

      # pecl install ssh2
      or
      # pecl install channel://pecl.php.net/ssh2-0.12

      3. For MysQL
      # yum install php-mysql

      I hope above steps will fix your issues.

      • Jon Reply to Jon
        September 3, 2013 at 2:31 pm

        Thank you for your reply. I’m still having issues getting pecl install ssh2 and pecl install channel://pecl.php.net/ssh2-0.12 installed. it gives me an error. ERROR: ‘phpize’ failed. If you have input it would be much appreciated.

        Thanks,

        Jon

        • Rahul K. Rahul Reply to Rahul
          September 3, 2013 at 5:30 pm

          Hi John,
          Can you please provide full output of both commands

          • Jon Reply to Jon
            September 3, 2013 at 6:27 pm

            So I’ve actually resolved the ssh2 issue now. But I’m now unable to get mysql to work. It says “MySQL: Not Available”.
            Now I’m quite sure i’ve installed everything properly. This only thing i’m questionable on is php-mysql. I’ve tried the yum install php-mysql with no success. It returns:

            Loaded plugins: fastestmirror, security
            Loading mirror speeds from cached hostfile
            * base: mirrors.usinternet.com
            * epel: linux.mirrors.es.net
            * extras: mirrors.xmission.com
            * updates: mirrors.easynews.com
            Setting up Install Process
            Resolving Dependencies
            –> Running transaction check
            —> Package php-mysql.x86_64 0:5.3.27-1.el6 will be installed
            –> Processing Dependency: php-pdo(x86-64) = 5.3.27-1.el6 for package: php-mysql-5.3.27-1.el6.x86_64
            –> Running transaction check
            —> Package php-pdo.x86_64 0:5.3.27-1.el6 will be installed
            –> Processing Dependency: php-common(x86-64) = 5.3.27-1.el6 for package: php-pdo-5.3.27-1.el6.x86_64
            –> Finished Dependency Resolution
            Error: Package: php-pdo-5.3.27-1.el6.x86_64 (CentALT)
            Requires: php-common(x86-64) = 5.3.27-1.el6
            Installed: php-common-5.4.19-1.el6.remi.x86_64 (@remi)
            php-common(x86-64) = 5.4.19-1.el6.remi
            Available: php-common-5.3.3-22.el6.x86_64 (base)
            php-common(x86-64) = 5.3.3-22.el6
            Available: php-common-5.3.3-23.el6_4.x86_64 (updates)
            php-common(x86-64) = 5.3.3-23.el6_4
            Available: php-common-5.3.27-1.el6.x86_64 (CentALT)
            php-common(x86-64) = 5.3.27-1.el6
            You could try using –skip-broken to work around the problem
            You could try running: rpm -Va –nofiles –nodigest

            So I’m not sure if its a installation problem or if i need to configure a file or something.

            Thanks,

            Jon Nelson

      • Jon Reply to Jon
        September 3, 2013 at 8:13 pm

        So I see that when I install MySQL it installs mariadb instead. Do you think this would be causing a linking error? Do you know why mariadb is installing instead of MySQL? I’m confused as to why this is being so much trouble.

        Thanks again!

        Jon

  24. vikas Reply to vikas
    August 16, 2013 at 2:09 pm

    thanks for very good info

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