Introduction

Nagios, a widely used open-source monitoring system, provides robust tools to monitor the health of various IT services, including web services. By setting up website monitoring in Nagios, we can proactively detect issues, ensure uptime, and optimize performance. This guide will walk through the steps required to configure Nagios for monitoring your website.

Prerequisite:

1. Server root login credentials.

Step 1:

Log in to the server as a user with sudo privileges.

$ ssh root@Ip

Step 2:

Ensure that we have check_http plugin under /usr/local/nagios/libexec/ directory, if there is no check_http plugin, download plugin from the following URL https://nagios-plugins.org/download/

$ cd /usr/local/nagios/libexec/

Step 3:

Login to Nagios server

Step 4:

Open the below for the configuration path.

$ vi /usr/local/nagios/etc/servers/server.cfg

Add the below lines in the configuration and save it.

define service {
       use                             generic-service         ; Name of service template to use
       host_name                       testserver2
       service_description           Check_URL
       check_command              check_http!-H example.com -S -f follow -e 200
       contact_groups                 admins
       notifications_enabled        1
       }

Step 5:

Save the configuration file.

And finally, restart Nagios to apply the recent configuration changes:

$ systemctl restart nagios

Conclusion:

Setting up website monitoring with Nagios is an effective way to ensure your website remains available and performs optimally. By configuring Nagios to monitor web services, we can detect potential issues early and respond swiftly to prevent downtime.

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