{"id":2713,"date":"2018-10-16T16:25:47","date_gmt":"2018-10-16T10:55:47","guid":{"rendered":"https:\/\/pheonixsolutions.com\/blog\/?p=2713"},"modified":"2026-09-29T12:31:46","modified_gmt":"2026-09-29T07:01:46","slug":"how-to-add-a-host-for-nagios-monitoring","status":"publish","type":"post","link":"https:\/\/pheonixsolutions.com\/blog\/how-to-add-a-host-for-nagios-monitoring\/","title":{"rendered":"How to add a host on nagios monitoring server"},"content":{"rendered":"\n<h4 class=\"wp-block-heading\">Post Date: October 12, 2018<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Last Updated:<\/strong> September 29, 2026<\/h4>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Nagios is one of the most popular open-source monitoring solutions used to monitor servers, network devices, applications, and services. By adding hosts to Nagios, administrators can proactively monitor system health, resource utilization, and service availability while receiving alerts when issues occur.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In this tutorial, you will learn how to add a new Linux host to a Nagios monitoring server using NRPE (Nagios Remote Plugin Executor). We will create a host configuration file, define service checks, validate the configuration, and restart Nagios to begin monitoring the remote server.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Prerequisites<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before proceeding, ensure the following requirements are met:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nagios Core is installed and running on the monitoring server.<\/li>\n\n\n\n<li>Nagios plugins are installed.<\/li>\n\n\n\n<li>NRPE is installed and configured on the remote host.<\/li>\n\n\n\n<li>The Nagios server can communicate with the remote host.<\/li>\n\n\n\n<li>Firewall rules allow NRPE communication (default port 5666).<\/li>\n\n\n\n<li>You have root or sudo access to both servers.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Required Packages<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">nagios-plugins\nnagios-nrpe-server<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">If Nagios is not yet installed, refer to our installation guide:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Nagios Remote Host Monitoring Guide<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Monitoring Workflow<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/pheonixsolutions.com\/blog\/wp-content\/uploads\/2018\/10\/nagios_host_config_workflow-scaled.png\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1000\" height=\"1024\" src=\"https:\/\/pheonixsolutions.com\/blog\/wp-content\/uploads\/2018\/10\/nagios_host_config_workflow-1000x1024.png\" alt=\"\" class=\"wp-image-12011\" srcset=\"https:\/\/pheonixsolutions.com\/blog\/wp-content\/uploads\/2018\/10\/nagios_host_config_workflow-1000x1024.png 1000w, https:\/\/pheonixsolutions.com\/blog\/wp-content\/uploads\/2018\/10\/nagios_host_config_workflow-293x300.png 293w, https:\/\/pheonixsolutions.com\/blog\/wp-content\/uploads\/2018\/10\/nagios_host_config_workflow-768x786.png 768w, https:\/\/pheonixsolutions.com\/blog\/wp-content\/uploads\/2018\/10\/nagios_host_config_workflow-1501x1536.png 1501w, https:\/\/pheonixsolutions.com\/blog\/wp-content\/uploads\/2018\/10\/nagios_host_config_workflow-2001x2048.png 2001w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/a><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 1: Login to the Nagios Monitoring Server<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Connect to your Nagios server using SSH.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">ssh root@your-nagios-server<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 2: Navigate to the Host Configuration Directory<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Move to the Nagios servers configuration directory.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">cd \/usr\/local\/nagios\/etc\/servers\/<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">This directory contains configuration files for monitored hosts.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 3: Create a New Host Configuration File<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If the host already exists, you can edit the existing configuration file. Otherwise, create a new file.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For this example, we will create a file named <code>sample.conf<\/code>.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">touch sample.conf<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 4: Edit the Configuration File<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Open the configuration file using your preferred editor.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">vi sample.conf<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Add the following host and service definitions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Host Definition<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">define host {\n    use                     linux-server\n    host_name               example\n    alias                   example\n    address                 101.101.101.101\n    max_check_attempts      5\n    check_period            24x7\n    notification_interval   30\n    notification_period     24x7\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Load Monitoring<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">define service{\n    use                     generic-service,nagiosgraph\n    host_name               example\n    service_description     Load\n    check_command           check_nrpe!check_load\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Disk Monitoring<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">define service{\n    use                     generic-service,nagiosgraph\n    host_name               example\n    service_description     Disk\n    check_command           check_nrpe!check_disk\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Process Monitoring<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">define service{\n    use                     generic-service,nagiosgraph\n    host_name               example\n    service_description     Processes\n    check_command           check_nrpe!check_procs\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Configuration Notes<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Replace the following values with your server details:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Parameter<\/th><th>Description<\/th><\/tr><tr><td>host_name<\/td><td>Name displayed in Nagios<\/td><\/tr><tr><td>alias<\/td><td>Friendly display name<\/td><\/tr><tr><td>address<\/td><td>Server IP address<\/td><\/tr><tr><td>example<\/td><td>Replace with your actual hostname<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Save the file and exit the editor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For Vi editor:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">:wq<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 5: Verify Nagios Configuration<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before restarting Nagios, always perform a syntax check.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/usr\/local\/nagios\/bin\/nagios -v \/usr\/local\/nagios\/etc\/nagios.cfg<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Example successful output:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">Total Warnings: 0\nTotal Errors: 0\n\nThings look okay - No serious problems were detected.<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">If errors are displayed, correct them before proceeding.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 6: Restart Nagios Service<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">After a successful configuration check, restart Nagios.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For Systemd-based systems:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">systemctl restart nagios<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Verify the service status:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">systemctl status nagios<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">For older systems:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">service nagios restart<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 7: Verify Host Monitoring in Nagios Web Interface<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Open the Nagios web interface:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">http:\/\/your-server-ip\/nagios<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Navigate to:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Hosts \u2192 example<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You should see:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Host Status<\/li>\n\n\n\n<li>Load Monitoring<\/li>\n\n\n\n<li>Disk Usage<\/li>\n\n\n\n<li>Process Monitoring<\/li>\n\n\n\n<li>Service Performance Graphs (if NagiosGraph is configured)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Allow a few minutes for the first monitoring results to appear.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Troubleshooting<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">NRPE Connection Failed<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Test connectivity from the Nagios server:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/usr\/local\/nagios\/libexec\/check_nrpe -H 101.101.101.101<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Expected output:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">NRPE v4.x.x<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Verify NRPE Service<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">On the remote host:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">systemctl status nrpe<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Start the service if necessary:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">systemctl start nrpe\nsystemctl enable nrpe<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Check Firewall Rules<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ensure port 5666 is open.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">firewall-cmd --list-ports<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Or:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">ufw status<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Best Practices<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use meaningful host names and aliases.<\/li>\n\n\n\n<li>Organize hosts into separate configuration files.<\/li>\n\n\n\n<li>Validate configuration before every restart.<\/li>\n\n\n\n<li>Monitor critical resources such as CPU, memory, disk, and processes.<\/li>\n\n\n\n<li>Keep NRPE and Nagios plugins updated.<\/li>\n\n\n\n<li>Document custom monitoring checks for future maintenance.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Adding a host to Nagios is a simple but essential task for centralized infrastructure monitoring. By creating a host configuration, defining service checks, validating the configuration, and restarting Nagios, administrators can quickly begin monitoring remote servers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Proper monitoring helps identify issues before they impact production systems, improves service availability, and provides valuable insights into system performance. Following the steps in this guide will help you maintain a scalable and reliable Nagios monitoring environment.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions (FAQ)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. How do I test whether NRPE is working?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Run the following command from the Nagios server:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/usr\/local\/nagios\/libexec\/check_nrpe -H &lt;remote-ip><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">If NRPE is working correctly, the version information will be displayed.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. Why is my host showing as DOWN in Nagios?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Common reasons include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Incorrect IP address in the configuration.<\/li>\n\n\n\n<li>Firewall blocking communication.<\/li>\n\n\n\n<li>NRPE service not running.<\/li>\n\n\n\n<li>DNS resolution issues.<\/li>\n\n\n\n<li>Network connectivity problems.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Use:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">ping &lt;remote-ip><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">to verify connectivity.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. How can I add more services to monitor?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">You can create additional service definitions such as:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">define service{\n    use                     generic-service\n    host_name               example\n    service_description     Memory Usage\n    check_command           check_nrpe!check_memory\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">The corresponding NRPE command must be configured on the remote server.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Related Article<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pheonixsolutions.com\/blog\/setting-up-django-and-your-web-server-with-uwsgi-and-nginx-on-ubuntu\/\">Setting up Django and your web server with uWSGI and nginx on Ubuntu<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/pheonixsolutions.com\/blog\/configure-multiple-uwsgi-application-on-nginx\/\">Configure multiple uwsgi application on nginx<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/pheonixsolutions.com\/blog\/configure-uwsgi-with-nginx-for-django-applications\/\">Configure uwsgi with nginx for Django applications<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Talk to our experts<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Have a technology challenge or looking for the right solution for your business? Our team can help you with <strong>cloud, DevOps, development, infrastructure, design, and more<\/strong>. Feel free to reach out to our experts <a href=\"https:\/\/pheonixsolutions.com\/contact\">here<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Post Date: October 12, 2018 Last Updated: September 29, 2026 Introduction Nagios is one of the most popular open-source monitoring [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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