Rocky Linux 8 – Nagios Library https://library.nagios.com Complete Nagios monitoring resources and documentation Tue, 10 Feb 2026 18:58:23 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://library.nagios.com/wp-content/uploads/2024/11/Nagios-Blue-N.svg Rocky Linux 8 – Nagios Library https://library.nagios.com 32 32 Configuring SNMP for Rocky Linux 8 Monitoring in Nagios XI: A Complete Guide https://library.nagios.com/tutorials/configuring-snmp-for-rocky-linux-8-monitoring-in-nagios-xi-a-complete-guide/ Fri, 28 Mar 2025 14:46:01 +0000 https://library.nagios.com/?p=53566 Enhance your Rocky Linux 8 monitoring by leveraging SNMP with Nagios XI for real-time performance tracking without additional agents. This guide walks you through configuring SNMP v2c and v3, ensuring secure and efficient system monitoring.

Prerequisites

Ensure the following before starting:

  • Rocky Linux 8 with root or sudo access
  • Nagios XI installed and accessible with SNMP wizard enabled
  • Port 161/UDP open on the server’s firewall

Step 1: Install SNMP

Install the SNMP packages:

sudo dnf install net-snmp net-snmp-utils -y

Verify SNMP version:

snmpd -v

Step 2: Configure SNMP Access

SNMP v2c Configuration

  1. Backup and create a new config file:
sudo cp /etc/snmp/snmpd.conf /etc/snmp/snmpd.bak
sudo sh -c "echo 'rocommunity Str0ngC0mmunity 10.25.5.12' > /etc/snmp/snmpd.conf"
  1. Restart SNMP:
sudo systemctl restart snmpd.service

SNMP v3 Configuration

  1. Stop SNMP service and clear old config:
sudo systemctl stop snmpd.service
sudo sh -c "echo '' > /etc/snmp/snmpd.conf"
  1. Create SNMP v3 user:
sudo net-snmp-create-v3-user -ro -a SHA -A Str0ng@uth3ntic@ti0n -x AES -X Str0ngPriv@cy nagios
  1. Restart SNMP:
sudo systemctl start snmpd.service

Step 3: Open SNMP Port in Firewall

sudo firewall-cmd --zone=public --add-port=161/udp --permanent
sudo firewall-cmd --reload

Check port:

sudo firewall-cmd --list-ports

Step 4: Enable SNMP on Boot

sudo systemctl enable snmpd.service

Step 5: Test SNMP Communication

From Nagios XI server:

SNMP v2c Test:

snmpwalk -v2c -c Str0ngC0mmunity <rocky-linux-ip>

SNMP v3 Test:

snmpwalk -v3 -u nagios -l authPriv -a SHA -A Str0ng@uth3ntic@ti0n -x AES -X Str0ngPriv@cy <rocky-linux-ip>

Example successful response:

iso.3.6.1.2.1.1.1.0 = STRING: "Linux rocky8"

Step 6: Add Rocky Linux 8 to Nagios XI with SNMP Wizard

1. Log into Nagios XI

2. Go to Configure > Run a configuring wizard

3. Choose Linux SNMP wizard

Linux SNMP 10
Linux SNMP

4. Enter IP address and SNMP credentials

Linux SNMP step 1 10
Rocky Linux Credentials

5. Select metrics (disk, CPU, processes, etc.)

6. Complete the wizard and apply configuration

Step 7: Customize Monitoring Items

  • Use check_snmp_storage.pl to test disk checks:
cd /usr/local/nagios/libexec
./check_snmp_storage.pl -H <ip> -C Str0ngC0mmunity -m "^/$" -w 80 -c 90
  • For SNMP v3:
./check_snmp_storage.pl -H <ip> -l nagios -x Str0ng@uth3ntic@ti0n -X Str0ngPriv@cy -L SHA,AES -m "^/$" -w 80 -c 90

Conclusion

You’ve successfully configured SNMP on Rocky Linux 8 for Nagios XI monitoring. Choose v2c for simplicity or v3 for enhanced security. Use Nagios XI’s SNMP wizard to streamline host and service creation.

Support Resources:

]]> Rocky Linux 8 Monitoring with NCPA in Nagios XI: A Complete Setup Guide https://library.nagios.com/tutorials/rocky-linux-8-monitoring-with-ncpa-in-nagios-xi-a-complete-setup-guide/ Fri, 28 Mar 2025 12:48:37 +0000 https://library.nagios.com/?p=53563 Ensuring the health and performance of your Rocky Linux 8 servers is crucial for maintaining a stable IT environment. The Nagios Cross-Platform Agent (NCPA) provides a powerful, secure, and efficient way to monitor system metrics in real time using a RESTful API. In this guide, you’ll learn how to install and configure NCPA on Rocky Linux 8, seamlessly integrating it with Nagios XI for proactive monitoring and insightful analytics.

Prerequisites

Before proceeding:

  • A Rocky Linux 8 system with sudo/root access
  • A Nagios XI server with NCPA Wizard enabled
  • Internet access for package downloads
  • Port 5693/TCP open in the firewall

Step 1: Install the Nagios Repository

To install NCPA using the Nagios repository:

sudo rpm -Uvh https://repo.nagios.com/nagios/8/nagios-repo-8-1.el8.noarch.rpm
sudo dnf clean all
sudo dnf update -y

Step 2: Install NCPA

Install the agent via the repository:

sudo dnf install ncpa -y

Verify installation:

rpm -q ncpa

Expected: ncpa-<version>.el8.x86_64

Step 3: Configure NCPA

Set your API token:

sudo nano /usr/local/ncpa/etc/ncpa.cfg

Locate:

community_string = mytoken

Replace with a strong, unique value:

community_string = Str0ngT0k3n

Save and exit (Ctrl+O, Enter, Ctrl+X in nano).

Step 4: Start and Enable NCPA

Enable and start the NCPA service:

sudo systemctl enable ncpa
sudo systemctl start ncpa
sudo systemctl status ncpa

Confirm it’s active (running).

Step 5: Configure Firewall

Allow traffic on TCP port 5693:

sudo firewall-cmd --zone=public --add-port=5693/tcp --permanent
sudo firewall-cmd --reload

Verify:

sudo firewall-cmd --list-ports
  • Ensure 5693/tcp is listed.

Step 6: Test NCPA Access

Open your browser and go to:

https://<RockyLinux8-IP>:5693/

Accept the certificate warning and log in with your token.

Step 7: Add Rocky Linux 8 Host to Nagios XI

1. Log into Nagios XI

2. Go to Configure > Configuration Wizards

3. Select NCPA

NCPA 10
NCPA

4. Enter:

  • IP: <RockyLinux8-IP>
  • Token: Str0ngT0k3n
rhel 5
Rocky Linux 8 Credentials

5. Choose metrics (CPU, Memory, Disk, etc.)

6. Apply the configuration

Common Issues & Fixes

NCPA Not Running

sudo journalctl -u ncpa --no-pager | tail -20
sudo systemctl restart ncpa

Host Down in Nagios XI

  • Confirm firewall:
sudo firewall-cmd --list-ports
  • Check service:
sudo systemctl status ncpa

Invalid Token

Ensure correct token in ncpa.cfg and restart:

sudo systemctl restart ncpa

Conclusion

You’ve now configured NCPA on Rocky Linux 8 for integration with Nagios XI. For further support:

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