[Nagios] Changing Alert Email Content

Defining a custom Nagios notify command so alert emails are readable for non-engineer team members.

[Nagios] Changing check_load Settings for Load Average Monitoring

Tightening Nagios's check_load intervals so load average spikes get flagged sooner.

[Nagios] Configuration File Verification, Reloading, etc.

Nagios commands for validating configuration files and reloading them without a full restart.

Collection of Articles Useful for Nagios Introduction and Configuration

A curated reading list for getting started with Nagios and configuring it in practice.

[Nagios] Return code of 255 is out of bounds error occurs when NRPE is not running

Return code of 255 usually means NRPE isn't running on the monitored host — start it and enable auto-start.

How to configure Nagios to send notifications to Slack channel

Posting Nagios alerts to a Slack channel via Incoming WebHooks and a small shell script, avoiding the Integration limit.

[Nagios] Configuration Method for Operating from Web Management Interface

Fixing the Nagios web UI permission error by joining nginx to the nagios group and tuning cgi.cfg authentication.

net-snmp Installation and Configuration Method

Installing net-snmp with yum and configuring snmpd.conf, service startup, and iptables port rules for Nagios monitoring.