{"id":35542,"date":"2021-06-23T12:30:00","date_gmt":"2021-06-23T17:30:00","guid":{"rendered":"https:\/\/www.rosehosting.com\/blog\/?p=35542"},"modified":"2022-06-03T03:31:38","modified_gmt":"2022-06-03T08:31:38","slug":"how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04","status":"publish","type":"post","link":"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/","title":{"rendered":"How To Install Nagios 4 and Monitor Your Servers on Ubuntu 20.04"},"content":{"rendered":"<div id=\"bsf_rt_marker\"><\/div>\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"742\" height=\"372\" src=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04-1.jpg\" alt=\"how to install nagios 4 and monitor your servers on ubuntu 20.04\" class=\"wp-image-37157\" srcset=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04-1.jpg 742w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04-1-300x150.jpg 300w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04-1-150x75.jpg 150w\" sizes=\"(max-width: 742px) 100vw, 742px\" \/><\/figure>\n\n\n\n<p>Nagios is a free, open-source, and powerful monitoring tool that helps you to monitor your entire IT infrastructure, servers, services, and applications from the central location. It is based on a client-server architecture.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04.jpg\" alt=\"\" class=\"wp-image-37158\" width=\"123\" height=\"83\" srcset=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04.jpg 555w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04-300x203.jpg 300w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04-150x102.jpg 150w\" sizes=\"(max-width: 123px) 100vw, 123px\" \/><\/figure><\/div>\n\n\n\n<p>So you will need to install the Nagios agent on the client system and add it to the Nagios server for monitoring. If you are looking for a monitoring solution then Nagios is an essential tool for any production server environment.<\/p>\n\n\n\n<!--more-->\n\n\n\n<p>Is there a way to do it by yourself? Of course there is. In this tutorial, we will show you how to install Nagios 4 and monitor your server on Ubuntu 20.04.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-662c80bc28973\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"ez-toc-cssicon\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-662c80bc28973\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#Prerequisites\" title=\"Prerequisites\">Prerequisites<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#Step-1-Log-in-to-the-Server-Update-the-Server-OS-Packages\" title=\"Step 1: Log in to the Server &amp; Update the Server OS Packages\">Step 1: Log in to the Server &amp; Update the Server OS Packages<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#Step-2-Install-Required-Dependencies\" title=\"Step 2: Install Required Dependencies\">Step 2: Install Required Dependencies<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#Step-3-Download-and-Install-Nagios-4\" title=\"Step 3: Download and Install Nagios 4\">Step 3: Download and Install Nagios 4<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#Step-4-Create-a-Nagios-Admin-User\" title=\"Step 4: Create a Nagios Admin User\">Step 4: Create a Nagios Admin User<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#Step-5-Configure-Nagios\" title=\"Step 5: Configure Nagios\">Step 5: Configure Nagios<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#Step-6-Access-Nagios-Web-UI\" title=\"Step 6: Access Nagios Web UI\">Step 6: Access Nagios Web UI<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#Step-7-Add-Monitoring-Hosts-to-Nagios-Server\" title=\"Step 7: Add Monitoring Hosts to Nagios Server\">Step 7: Add Monitoring Hosts to Nagios Server<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#Step-8-Add-Client-Hosts-to-the-Nagios-Server\" title=\"Step 8: Add Client Hosts to the Nagios Server\">Step 8: Add Client Hosts to the Nagios Server<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#Step-9-Verify-Nagios\" title=\"Step 9: Verify Nagios\">Step 9: Verify Nagios<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"h-prerequisites\"><span class=\"ez-toc-section\" id=\"Prerequisites\"><\/span>Prerequisites<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul><li>Two Ubuntu 20.04 VPS one for Nagios server and one for Nagios client.<\/li><li>Access to the root user account (or access to an admin account with root privileges)<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-1-log-in-to-the-server-update-the-server-os-packages\"><span class=\"ez-toc-section\" id=\"Step-1-Log-in-to-the-Server-Update-the-Server-OS-Packages\"><\/span>Step 1: Log in to the Server &amp; Update the Server OS Packages<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>First, log in to your Ubuntu 20.04 server via SSH as the root user:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">ssh root@IP_Address -p Port_number<\/pre>\n\n\n\n<p>You will need to replace &#8216;IP_Address&#8217; and &#8216;Port_number&#8217; with your server\u2019s respective IP address and SSH port number. Additionally, replace &#8216;root&#8217; with the username of the admin account if necessary.<\/p>\n\n\n\n<p>Before starting, you have to make sure that all Ubuntu OS packages installed on the server are up to date. You can do this by running the following commands:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">apt-get update -y\napt-get upgrade -y<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-2-install-required-dependencies\"><span class=\"ez-toc-section\" id=\"Step-2-Install-Required-Dependencies\"><\/span>Step 2: Install Required Dependencies<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Before starting, you will need to install some dependencies required to install Nagios in your system. You can install all of them with the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">apt-get install autoconf bc gawk dc build-essential gcc libc6 make wget unzip apache2 php libapache2-mod-php libgd-dev libmcrypt-dev make libssl-dev snmp libnet-snmp-perl gettext -y<\/pre>\n\n\n\n<p>Once all the dependencies are installed, you can proceed to download the Nagios 4 core.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-3-download-and-install-nagios-4\"><span class=\"ez-toc-section\" id=\"Step-3-Download-and-Install-Nagios-4\"><\/span>Step 3: Download and Install Nagios 4<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>First, download the latest version of Nagios 4 from its official website using the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">wget https:\/\/assets.nagios.com\/downloads\/nagioscore\/releases\/nagios-4.4.6.tar.gz<\/pre>\n\n\n\n<p>Once the download is completed, extract the downloaded file with the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">tar -xvzf nagios-4.4.6.tar.gz<\/pre>\n\n\n\n<p>Next, change the directory to the extracted directory and configure it with the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">cd nagios-4.4.6\n.\/configure --with-httpd-conf=\/etc\/apache2\/sites-enabled<\/pre>\n\n\n\n<p>You should get the following output:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">        Nagios user\/group:  nagios,nagios\n       Command user\/group:  nagios,nagios\n             Event Broker:  yes\n        Install ${prefix}:  \/usr\/local\/nagios\n    Install ${includedir}:  \/usr\/local\/nagios\/include\/nagios\n                Lock file:  \/run\/nagios.lock\n   Check result directory:  \/usr\/local\/nagios\/var\/spool\/checkresults\n           Init directory:  \/lib\/systemd\/system\n  Apache conf.d directory:  \/etc\/apache2\/sites-enabled\n             Mail program:  \/bin\/mail\n                  Host OS:  linux-gnu\n          IOBroker Method:  epoll\n\n Web Interface Options:\n ------------------------\n                 HTML URL:  http:\/\/localhost\/nagios\/\n                  CGI URL:  http:\/\/localhost\/nagios\/cgi-bin\/\n Traceroute (used by WAP):  \n\n\nReview the options above for accuracy.  If they look okay,\ntype 'make all' to compile the main program and CGIs.\n<\/pre>\n\n\n\n<p>Next, build the Nagios with the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">make all<\/pre>\n\n\n\n<p>Next, create a Nagios user and group and add it to the www-data group with the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">make install-groups-users\nusermod -a -G nagios www-data<\/pre>\n\n\n\n<p>Next, run the following command to install Nagios binaries, daemon and command mode:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">make install\nmake install-daemoninit\nmake install-commandmode<\/pre>\n\n\n\n<p>Next, install sample script config and Apache web configuration using the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">make install-config\nmake install-webconf<\/pre>\n\n\n\n<p>Next, enable the rewrite and cgi module with the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">a2enmod rewrite cgi<\/pre>\n\n\n\n<p>Next, restart the Apache service to apply the changes:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">systemctl restart apache2<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-4-create-a-nagios-admin-user\"><span class=\"ez-toc-section\" id=\"Step-4-Create-a-Nagios-Admin-User\"><\/span>Step 4: Create a Nagios Admin User<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Next, you will need to create a Nagios user to access the Nagios web interface. You can create it with the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">htpasswd -c \/usr\/local\/nagios\/etc\/htpasswd.users nagiosadmin<\/pre>\n\n\n\n<p>You will be asked to set a password as shown below:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">New password: \nRe-type new password: \nAdding password for user nagiosadmin\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-5-configure-nagios\"><span class=\"ez-toc-section\" id=\"Step-5-Configure-Nagios\"><\/span>Step 5: Configure Nagios<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Before configuring Nagios, you will need to install the Nagios Plugins and NRPE Plugins. You can install them with the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">apt-get install monitoring-plugins nagios-nrpe-plugin -y<\/pre>\n\n\n\n<p>Once all the packages are installed, create a directory to store all configuration:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">mkdir -p \/usr\/local\/nagios\/etc\/servers<\/pre>\n\n\n\n<p>Next, edit the Nagios configuration file and define the server directory:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">nano \/usr\/local\/nagios\/etc\/nagios.cfg<\/pre>\n\n\n\n<p>Change the following line:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">cfg_dir=\/usr\/local\/nagios\/etc\/servers\n<\/pre>\n\n\n\n<p>Next, edit the Nagios resource.cfg and define the Nagios plugins path:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">nano \/usr\/local\/nagios\/etc\/resource.cfg<\/pre>\n\n\n\n<p>Change the following line:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">$USER1$=\/usr\/lib\/nagios\/plugins\n<\/pre>\n\n\n\n<p>Save and close the file then edit the contacts.cfg and define your contact name and email address:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">nano \/usr\/local\/nagios\/etc\/objects\/contacts.cfg<\/pre>\n\n\n\n<p>Change the following lines as per your needs:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">define contact {\n\n    contact_name            nagiosadmin             ; Short name of user\n    use                     generic-contact         ; Inherit default values from generic-contact template (defined above)\n    alias                   Nagios Admin            ; Full name of user\n    email                   nagios@localhost ; &lt;&lt;***** CHANGE THIS TO YOUR EMAIL ADDRESS ******\n}\n<\/pre>\n\n\n\n<p>Save and close the file then edit the commands.cfg and define the nrpe check commands:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">nano \/usr\/local\/nagios\/etc\/objects\/commands.cfg <\/pre>\n\n\n\n<p>Add the following lines at the end of the file:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">define command{\n        command_name check_nrpe\n        command_line $USER1$\/check_nrpe -H $HOSTADDRESS$ -c $ARG1$\n}\n<\/pre>\n\n\n\n<p>Save and close the file then start the Nagios service and enable it to start at system reboot:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">systemctl start nagios\nsystemctl enable nagios<\/pre>\n\n\n\n<p>You can also verify the status of Nagios service with the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">systemctl status nagios<\/pre>\n\n\n\n<p>Output:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u25cf nagios.service - Nagios Core 4.4.6\n     Loaded: loaded (\/lib\/systemd\/system\/nagios.service; enabled; vendor preset: enabled)\n     Active: active (running) since Sat 2021-02-06 13:37:33 UTC; 19s ago\n       Docs: https:\/\/www.nagios.org\/documentation\n   Main PID: 25820 (nagios)\n      Tasks: 6 (limit: 2353)\n     Memory: 2.7M\n     CGroup: \/system.slice\/nagios.service\n             \u251c\u250025820 \/usr\/local\/nagios\/bin\/nagios -d \/usr\/local\/nagios\/etc\/nagios.cfg\n             \u251c\u250025821 \/usr\/local\/nagios\/bin\/nagios --worker \/usr\/local\/nagios\/var\/rw\/nagios.qh\n             \u251c\u250025822 \/usr\/local\/nagios\/bin\/nagios --worker \/usr\/local\/nagios\/var\/rw\/nagios.qh\n             \u251c\u250025823 \/usr\/local\/nagios\/bin\/nagios --worker \/usr\/local\/nagios\/var\/rw\/nagios.qh\n             \u251c\u250025824 \/usr\/local\/nagios\/bin\/nagios --worker \/usr\/local\/nagios\/var\/rw\/nagios.qh\n             \u2514\u250025840 \/usr\/local\/nagios\/bin\/nagios -d \/usr\/local\/nagios\/etc\/nagios.cfg\n\nFeb 06 13:37:33 nagiosserver nagios[25820]: qh: Socket '\/usr\/local\/nagios\/var\/rw\/nagios.qh' successfully init\n<\/pre>\n\n\n\n<p>Finally, restart the Apache service to apply the changes:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">systemctl restart apache2<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-6-access-nagios-web-ui\"><span class=\"ez-toc-section\" id=\"Step-6-Access-Nagios-Web-UI\"><\/span>Step 6: Access Nagios Web UI<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Now, open your web browser and access the Nagios web interface using the URL http:\/\/nagios-server-ip\/nagios\/. You will be asked to provide admin username and password as shown below:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"319\" src=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/setting-up-nagios-4-on-ubuntu-20.04.png\" alt=\"setting up nagios 4 on ubuntu 20.04\" class=\"wp-image-37161\" srcset=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/setting-up-nagios-4-on-ubuntu-20.04.png 1024w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/setting-up-nagios-4-on-ubuntu-20.04-300x93.png 300w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/setting-up-nagios-4-on-ubuntu-20.04-150x47.png 150w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/setting-up-nagios-4-on-ubuntu-20.04-768x239.png 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Provide your Nagios admin username, password and click on the <strong>Sign<\/strong> <strong>In<\/strong> button. You should see the Nagios dashboard on the following page:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"533\" src=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/install-nagios-4-to-monitor-servers-on-ubuntu-20.04.png\" alt=\"install nagios 4 to monitor servers on ubuntu 20.04\" class=\"wp-image-37162\" srcset=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/install-nagios-4-to-monitor-servers-on-ubuntu-20.04.png 1024w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/install-nagios-4-to-monitor-servers-on-ubuntu-20.04-300x156.png 300w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/install-nagios-4-to-monitor-servers-on-ubuntu-20.04-150x78.png 150w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/install-nagios-4-to-monitor-servers-on-ubuntu-20.04-768x400.png 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Click on the <strong>services<\/strong> in the left pane, you should see all services on the following page:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"529\" src=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-set-up-nagios-4-to-monitor-your-servers-on-ubuntu-20.04.png\" alt=\"how to set up nagios 4 to monitor your servers on ubuntu 20.04\" class=\"wp-image-37163\" srcset=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-set-up-nagios-4-to-monitor-your-servers-on-ubuntu-20.04.png 1024w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-set-up-nagios-4-to-monitor-your-servers-on-ubuntu-20.04-300x155.png 300w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-set-up-nagios-4-to-monitor-your-servers-on-ubuntu-20.04-150x77.png 150w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-set-up-nagios-4-to-monitor-your-servers-on-ubuntu-20.04-768x397.png 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-7-add-monitoring-hosts-to-nagios-server\"><span class=\"ez-toc-section\" id=\"Step-7-Add-Monitoring-Hosts-to-Nagios-Server\"><\/span>Step 7: Add Monitoring Hosts to Nagios Server<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Next, you will need to install the Nagios agent on the client system and add it to the Nagios server.<\/p>\n\n\n\n<p>First, install the Nagios and NRPE package on the client system with the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">apt-get install nagios-nrpe-server monitoring-plugins -y<\/pre>\n\n\n\n<p>Once installed, edit the nrpe.cfg file and define your Nagios server IP and CLient IP:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">nano \/etc\/nagios\/nrpe.cfg<\/pre>\n\n\n\n<p>Change the following lines that match your server and client IP:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">server_address=client-ip-address\nallowed_hosts=127.0.0.1,::1,server-ip-address\n<\/pre>\n\n\n\n<p>Save and close the file. Then edit the nrpe_local.cfg:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">nano \/etc\/nagios\/nrpe_local.cfg<\/pre>\n\n\n\n<p>Add or change the following lines:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">command[check_root]=\/usr\/lib\/nagios\/plugins\/check_disk -w 20% -c 10% -p \/\ncommand[check_ping]=\/usr\/lib\/nagios\/plugins\/check_ping -H client-ip-address -w 100.0,20% -c 500.0,60% -p 5\ncommand[check_http]=\/usr\/lib\/nagios\/plugins\/check_http -I client-ip-address\ncommand[check_ssh]=\/usr\/lib\/nagios\/plugins\/check_ssh -4 client-ip-address\n<\/pre>\n\n\n\n<p>Save and close the file then restart the Nagios NRPE service and enable it to start at system reboot:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">systemctl restart nagios-nrpe-server\nsystemctl enable nagios-nrpe-server<\/pre>\n\n\n\n<p>You can check the status of the service with the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">systemctl status nagios-nrpe-server<\/pre>\n\n\n\n<p>Output:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u25cf nagios-nrpe-server.service - Nagios Remote Plugin Executor\n     Loaded: loaded (\/lib\/systemd\/system\/nagios-nrpe-server.service; enabled; vendor preset: enabled)\n     Active: active (running) since Sat 2021-02-06 13:51:40 UTC; 16s ago\n       Docs: http:\/\/www.nagios.org\/documentation\n   Main PID: 5966 (nrpe)\n      Tasks: 1 (limit: 1145)\n     Memory: 688.0K\n     CGroup: \/system.slice\/nagios-nrpe-server.service\n             \u2514\u25005966 \/usr\/sbin\/nrpe -c \/etc\/nagios\/nrpe.cfg -f\n\nFeb 06 13:51:40 nagiosclient systemd[1]: Started Nagios Remote Plugin Executor.\nFeb 06 13:51:40 nagiosclient nrpe[5966]: Starting up daemon\nFeb 06 13:51:40 nagiosclient nrpe[5966]: Server listening on 104.245.33.71 port 5666.\nFeb 06 13:51:40 nagiosclient nrpe[5966]: Listening for connections on port 5666\nFeb 06 13:51:40 nagiosclient nrpe[5966]: Allowing connections from: 127.0.0.1,::1,nagios-server-ip\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-8-add-client-hosts-to-the-nagios-server\"><span class=\"ez-toc-section\" id=\"Step-8-Add-Client-Hosts-to-the-Nagios-Server\"><\/span>Step 8: Add Client Hosts to the Nagios Server<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Next, you will need to add client host to the Nagios server and define the service that you want to monitor.<\/p>\n\n\n\n<p>On the Nagios server, create a new file named nagiosclient.cfg:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">nano \/usr\/local\/nagios\/etc\/servers\/nagiosclient.cfg<\/pre>\n\n\n\n<p>Add the following lines:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">define host {\n        use                          linux-server\n        host_name                    nagiosclient\n        alias                        Ubuntu Host\n        address                      client-ip-address\n        register                     1\n}\n\ndefine service {\n      host_name                       nagiosclient\n      service_description             PING\n      check_command                   check_nrpe!check_ping\n      max_check_attempts              2\n      check_interval                  2\n      retry_interval                  2\n      check_period                    24x7\n      check_freshness                 1\n      contact_groups                  admins\n      notification_interval           2\n      notification_period             24x7\n      notifications_enabled           1\n      register                        1\n}\n\ndefine service {\n      host_name                       nagiosclient\n      service_description             Check Users\n      check_command                   check_nrpe!check_users\n      max_check_attempts              2\n      check_interval                  2\n      retry_interval                  2\n      check_period                    24x7\n      check_freshness                 1\n      contact_groups                  admins\n      notification_interval           2\n      notification_period             24x7\n      notifications_enabled           1\n      register                        1\n}\n\ndefine service {\n      host_name                       nagiosclient\n      service_description             Check SSH\n      check_command                   check_nrpe!check_ssh\n      max_check_attempts              2\n      check_interval                  2\n      retry_interval                  2\n      check_period                    24x7\n      check_freshness                 1\n      contact_groups                  admins\n      notification_interval           2\n      notification_period             24x7\n      notifications_enabled           1\n      register                        1\n}\n\ndefine service {\n      host_name                       nagiosclient\n      service_description             Check Root \/ Disk\n      check_command                   check_nrpe!check_root\n      max_check_attempts              2\n      check_interval                  2\n      retry_interval                  2\n      check_period                    24x7\n      check_freshness                 1\n      contact_groups                  admins\n      notification_interval           2\n      notification_period             24x7\n      notifications_enabled           1\n      register                        1\n}\n\ndefine service {\n      host_name                       nagiosclient\n      service_description             Check HTTP\n      check_command                   check_nrpe!check_http\n      max_check_attempts              2\n      check_interval                  2\n      retry_interval                  2\n      check_period                    24x7\n      check_freshness                 1\n      contact_groups                  admins\n      notification_interval           2\n      notification_period             24x7\n      notifications_enabled           1\n      register                        1\n}\n<\/pre>\n\n\n\n<p>Save and close the file then restart the Nagios service to apply the changes:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">systemctl restart nagios<\/pre>\n\n\n\n<p>At this point, Nagios server and client are installed and configured.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-9-verify-nagios\"><span class=\"ez-toc-section\" id=\"Step-9-Verify-Nagios\"><\/span>Step 9: Verify Nagios<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Now, go back to Nagios web interface and click on the hosts in the left pane, you should see all newly added client host in the following page:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"530\" src=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/nagios-4-setting-up-to-monitor-your-servers-on-ubuntu-20.04.png\" alt=\"nagios 4 setting up to monitor your servers on ubuntu 20.04\" class=\"wp-image-37164\" srcset=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/nagios-4-setting-up-to-monitor-your-servers-on-ubuntu-20.04.png 1024w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/nagios-4-setting-up-to-monitor-your-servers-on-ubuntu-20.04-300x155.png 300w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/nagios-4-setting-up-to-monitor-your-servers-on-ubuntu-20.04-150x78.png 150w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/nagios-4-setting-up-to-monitor-your-servers-on-ubuntu-20.04-768x398.png 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Now, click on the <strong>service<\/strong> tab in the left pane, you should see all services in the following page:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"529\" src=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/installing-nagios-4-for-server-monitoring-on-ubuntu-20.04.png\" alt=\"installing nagios 4 for server monitoring on ubuntu 20.04\" class=\"wp-image-37165\" srcset=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/installing-nagios-4-for-server-monitoring-on-ubuntu-20.04.png 1024w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/installing-nagios-4-for-server-monitoring-on-ubuntu-20.04-300x155.png 300w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/installing-nagios-4-for-server-monitoring-on-ubuntu-20.04-150x77.png 150w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/installing-nagios-4-for-server-monitoring-on-ubuntu-20.04-768x397.png 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Of course, you don\u2019t have to install Nagios on Ubuntu if you use one of our <a href=\"https:\/\/rosehosting.com\/managed-vps-hosting.html\">Managed hosting services<\/a>, in which case you can simply ask our expert Linux admins to install this for you. They are available 24\u00d77 and will take care of your request immediately.<\/p>\n\n\n\n<p><strong>PS<\/strong>. If you liked this post on how to install Nagios on Ubuntu, please share it with your friends on the social networks using the buttons on the left or simply leave a reply below. Thanks.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nagios is a free, open-source, and powerful monitoring tool that helps you to monitor your entire IT infrastructure, servers, services, &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"How To Install Nagios 4 and Monitor Your Servers on Ubuntu 20.04\" class=\"read-more button\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#more-35542\" aria-label=\"Read more about How To Install Nagios 4 and Monitor Your Servers on Ubuntu 20.04\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":37157,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1698],"tags":[172,1901,1839],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How To Install Nagios 4 and Monitor Your Servers on Ubuntu 20.04<\/title>\n<meta name=\"description\" content=\"Learn how to install Nagios 4 to help monitor your services on Ubuntu 20.04. Check out our tutorial and do it with ease.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How To Install Nagios 4 and Monitor Your Servers on Ubuntu 20.04 | RoseHosting\" \/>\n<meta property=\"og:description\" content=\"Learn how to install Nagios 4 to help monitor your services on Ubuntu 20.04. Check out our tutorial and do it with ease.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/\" \/>\n<meta property=\"og:site_name\" content=\"RoseHosting\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/RoseHosting\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/rosehosting.helpdesk\" \/>\n<meta property=\"article:published_time\" content=\"2021-06-23T17:30:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-06-03T08:31:38+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04-1.jpg?v=1622100511\" \/>\n\t<meta property=\"og:image:width\" content=\"742\" \/>\n\t<meta property=\"og:image:height\" content=\"372\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Jeff Wilson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"How To Install Nagios 4 and Monitor Your Servers on Ubuntu 20.04 | RoseHosting\" \/>\n<meta name=\"twitter:description\" content=\"Learn how to install Nagios 4 to help monitor your services on Ubuntu 20.04. Check out our tutorial and do it with ease.\" \/>\n<meta name=\"twitter:creator\" content=\"@rosehosting\" \/>\n<meta name=\"twitter:site\" content=\"@rosehosting\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jeff Wilson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"9 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/\"},\"author\":{\"name\":\"Jeff Wilson\",\"@id\":\"https:\/\/www.rosehosting.com\/blog\/#\/schema\/person\/7ce77a842fa6a9a7f8efa186f2353713\"},\"headline\":\"How To Install Nagios 4 and Monitor Your Servers on Ubuntu 20.04\",\"datePublished\":\"2021-06-23T17:30:00+00:00\",\"dateModified\":\"2022-06-03T08:31:38+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/\"},\"wordCount\":996,\"commentCount\":4,\"publisher\":{\"@id\":\"https:\/\/www.rosehosting.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04-1.jpg\",\"keywords\":[\"install\",\"nagios 4\",\"Ubuntu 20.04\"],\"articleSection\":[\"Ubuntu\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/\",\"url\":\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/\",\"name\":\"How To Install Nagios 4 and Monitor Your Servers on Ubuntu 20.04\",\"isPartOf\":{\"@id\":\"https:\/\/www.rosehosting.com\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04-1.jpg\",\"datePublished\":\"2021-06-23T17:30:00+00:00\",\"dateModified\":\"2022-06-03T08:31:38+00:00\",\"description\":\"Learn how to install Nagios 4 to help monitor your services on Ubuntu 20.04. Check out our tutorial and do it with ease.\",\"breadcrumb\":{\"@id\":\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#primaryimage\",\"url\":\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04-1.jpg\",\"contentUrl\":\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04-1.jpg\",\"width\":742,\"height\":372,\"caption\":\"how to install nagios 4 and monitor your servers on ubuntu 20.04\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.rosehosting.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"How To Install Nagios 4 and Monitor Your Servers on Ubuntu 20.04\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.rosehosting.com\/blog\/#website\",\"url\":\"https:\/\/www.rosehosting.com\/blog\/\",\"name\":\"RoseHosting\",\"description\":\"Premium Linux Tutorials Since 2001\",\"publisher\":{\"@id\":\"https:\/\/www.rosehosting.com\/blog\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.rosehosting.com\/blog\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.rosehosting.com\/blog\/#organization\",\"name\":\"RoseHosting\",\"url\":\"https:\/\/www.rosehosting.com\/blog\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.rosehosting.com\/blog\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2022\/03\/android-chrome-192x192-1.png\",\"contentUrl\":\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2022\/03\/android-chrome-192x192-1.png\",\"width\":192,\"height\":192,\"caption\":\"RoseHosting\"},\"image\":{\"@id\":\"https:\/\/www.rosehosting.com\/blog\/#\/schema\/logo\/image\/\"},\"sameAs\":[\"https:\/\/www.facebook.com\/RoseHosting\",\"https:\/\/x.com\/rosehosting\",\"https:\/\/www.linkedin.com\/in\/rosehosting\/\"]},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.rosehosting.com\/blog\/#\/schema\/person\/7ce77a842fa6a9a7f8efa186f2353713\",\"name\":\"Jeff Wilson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.rosehosting.com\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/09271207587f897ab46faaed9b355252?s=96&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/09271207587f897ab46faaed9b355252?s=96&r=g\",\"caption\":\"Jeff Wilson\"},\"description\":\"An experienced Linux veteran with many years of experience. Helping other Linux admins with frequent Linux and business-related blog posts on the RoseHosting blog. Techie by choice. Loving nature and travel. Happily married and father of two lovely children.\",\"sameAs\":[\"https:\/\/www.rosehosting.com\",\"https:\/\/www.facebook.com\/rosehosting.helpdesk\"],\"url\":\"https:\/\/www.rosehosting.com\/blog\/author\/jwilson\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"How To Install Nagios 4 and Monitor Your Servers on Ubuntu 20.04","description":"Learn how to install Nagios 4 to help monitor your services on Ubuntu 20.04. Check out our tutorial and do it with ease.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/","og_locale":"en_US","og_type":"article","og_title":"How To Install Nagios 4 and Monitor Your Servers on Ubuntu 20.04 | RoseHosting","og_description":"Learn how to install Nagios 4 to help monitor your services on Ubuntu 20.04. Check out our tutorial and do it with ease.","og_url":"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/","og_site_name":"RoseHosting","article_publisher":"https:\/\/www.facebook.com\/RoseHosting","article_author":"https:\/\/www.facebook.com\/rosehosting.helpdesk","article_published_time":"2021-06-23T17:30:00+00:00","article_modified_time":"2022-06-03T08:31:38+00:00","og_image":[{"width":742,"height":372,"url":"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04-1.jpg?v=1622100511","type":"image\/jpeg"}],"author":"Jeff Wilson","twitter_card":"summary_large_image","twitter_title":"How To Install Nagios 4 and Monitor Your Servers on Ubuntu 20.04 | RoseHosting","twitter_description":"Learn how to install Nagios 4 to help monitor your services on Ubuntu 20.04. Check out our tutorial and do it with ease.","twitter_creator":"@rosehosting","twitter_site":"@rosehosting","twitter_misc":{"Written by":"Jeff Wilson","Est. reading time":"9 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#article","isPartOf":{"@id":"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/"},"author":{"name":"Jeff Wilson","@id":"https:\/\/www.rosehosting.com\/blog\/#\/schema\/person\/7ce77a842fa6a9a7f8efa186f2353713"},"headline":"How To Install Nagios 4 and Monitor Your Servers on Ubuntu 20.04","datePublished":"2021-06-23T17:30:00+00:00","dateModified":"2022-06-03T08:31:38+00:00","mainEntityOfPage":{"@id":"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/"},"wordCount":996,"commentCount":4,"publisher":{"@id":"https:\/\/www.rosehosting.com\/blog\/#organization"},"image":{"@id":"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#primaryimage"},"thumbnailUrl":"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04-1.jpg","keywords":["install","nagios 4","Ubuntu 20.04"],"articleSection":["Ubuntu"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/","url":"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/","name":"How To Install Nagios 4 and Monitor Your Servers on Ubuntu 20.04","isPartOf":{"@id":"https:\/\/www.rosehosting.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#primaryimage"},"image":{"@id":"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#primaryimage"},"thumbnailUrl":"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04-1.jpg","datePublished":"2021-06-23T17:30:00+00:00","dateModified":"2022-06-03T08:31:38+00:00","description":"Learn how to install Nagios 4 to help monitor your services on Ubuntu 20.04. Check out our tutorial and do it with ease.","breadcrumb":{"@id":"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#primaryimage","url":"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04-1.jpg","contentUrl":"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2021\/05\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20.04-1.jpg","width":742,"height":372,"caption":"how to install nagios 4 and monitor your servers on ubuntu 20.04"},{"@type":"BreadcrumbList","@id":"https:\/\/www.rosehosting.com\/blog\/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-20-04\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.rosehosting.com\/blog\/"},{"@type":"ListItem","position":2,"name":"How To Install Nagios 4 and Monitor Your Servers on Ubuntu 20.04"}]},{"@type":"WebSite","@id":"https:\/\/www.rosehosting.com\/blog\/#website","url":"https:\/\/www.rosehosting.com\/blog\/","name":"RoseHosting","description":"Premium Linux Tutorials Since 2001","publisher":{"@id":"https:\/\/www.rosehosting.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.rosehosting.com\/blog\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.rosehosting.com\/blog\/#organization","name":"RoseHosting","url":"https:\/\/www.rosehosting.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.rosehosting.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2022\/03\/android-chrome-192x192-1.png","contentUrl":"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2022\/03\/android-chrome-192x192-1.png","width":192,"height":192,"caption":"RoseHosting"},"image":{"@id":"https:\/\/www.rosehosting.com\/blog\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/RoseHosting","https:\/\/x.com\/rosehosting","https:\/\/www.linkedin.com\/in\/rosehosting\/"]},{"@type":"Person","@id":"https:\/\/www.rosehosting.com\/blog\/#\/schema\/person\/7ce77a842fa6a9a7f8efa186f2353713","name":"Jeff Wilson","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.rosehosting.com\/blog\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/09271207587f897ab46faaed9b355252?s=96&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/09271207587f897ab46faaed9b355252?s=96&r=g","caption":"Jeff Wilson"},"description":"An experienced Linux veteran with many years of experience. Helping other Linux admins with frequent Linux and business-related blog posts on the RoseHosting blog. Techie by choice. Loving nature and travel. Happily married and father of two lovely children.","sameAs":["https:\/\/www.rosehosting.com","https:\/\/www.facebook.com\/rosehosting.helpdesk"],"url":"https:\/\/www.rosehosting.com\/blog\/author\/jwilson\/"}]}},"_links":{"self":[{"href":"https:\/\/www.rosehosting.com\/blog\/wp-json\/wp\/v2\/posts\/35542"}],"collection":[{"href":"https:\/\/www.rosehosting.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.rosehosting.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.rosehosting.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.rosehosting.com\/blog\/wp-json\/wp\/v2\/comments?post=35542"}],"version-history":[{"count":10,"href":"https:\/\/www.rosehosting.com\/blog\/wp-json\/wp\/v2\/posts\/35542\/revisions"}],"predecessor-version":[{"id":37254,"href":"https:\/\/www.rosehosting.com\/blog\/wp-json\/wp\/v2\/posts\/35542\/revisions\/37254"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.rosehosting.com\/blog\/wp-json\/wp\/v2\/media\/37157"}],"wp:attachment":[{"href":"https:\/\/www.rosehosting.com\/blog\/wp-json\/wp\/v2\/media?parent=35542"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.rosehosting.com\/blog\/wp-json\/wp\/v2\/categories?post=35542"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.rosehosting.com\/blog\/wp-json\/wp\/v2\/tags?post=35542"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}