Rocky Linux – 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 – 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:

]]> Monitoring Rocky Linux 9 with SNMP in Nagios XI: A Step-by-Step Guide https://library.nagios.com/tutorials/monitoring-rocky-linux-9-with-snmp-in-nagios-xi-a-step-by-step-guide/ Thu, 27 Mar 2025 18:37:42 +0000 https://library.nagios.com/?p=53560 Monitoring Rocky Linux 9 with Simple Network Management Protocol (SNMP) in Nagios XI offers a streamlined, agentless approach to tracking system performance and availability. By leveraging SNMP, Nagios XI can efficiently collect key metrics—such as CPU usage, memory utilization, disk space, and network activity—without requiring additional software installations.

This guide provides a step-by-step walkthrough on configuring SNMP on Rocky Linux 9, a reliable RHEL-compatible distribution, and seamlessly integrating it with Nagios XI for real-time monitoring.

Prerequisites

Before you begin, make sure you have:

  • A Rocky Linux 9 system with root or sudo privileges
  • A working Nagios XI server with SNMP Wizard enabled
  • Network connectivity between the server and Nagios XI
  • Port 161/UDP open in the Rocky Linux firewall

Step 1: Install SNMP and Utilities

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

Verify installation:

snmpd -v

Step 2: Configure SNMP Access

SNMP v2c Configuration

  1. Backup the default config:
sudo cp /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.bak
  1. Configure access for Nagios XI:
echo "rocommunity Str0ngC0mmunity <Nagios-XI-IP>" | sudo tee /etc/snmp/snmpd.conf
  1. Restart SNMP:
sudo systemctl restart snmpd.service

SNMP v3 Configuration (More Secure)

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

Step 3: Configure the Firewall

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

Check allowed ports:

sudo firewall-cmd --list-ports

Step 4: Enable SNMP on Boot

sudo systemctl enable snmpd.service

Step 5: Test SNMP Communication

Run from the Nagios XI server:

For SNMP v2c:

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

For SNMP v3:

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

Check for responses like:

iso.3.6.1.2.1.1.1.0 = STRING: "Linux rocky9"

Step 6: Add Rocky Linux 9 to Nagios XI Using the SNMP Wizard

Integrate the Rocky Linux system into Nagios XI:

1. Log into Nagios XI:

  • Access the web interface.

2. Run the SNMP Wizard:

  • Navigate to Configure > Configuration Wizards.
  • Select Linux SNMP.
Linux SNMP 9
Linux SNMP

3. Configure the Host:

  • Hostname/IP: Enter the Rocky Linux 9 IP (e.g., 192.168.0.31).
  • SNMP Version: Choose v2c or v3.
  • For v2c:
    • Community String: Str0ngC0mmunity.
  • For v3:
    • Username: nagios.
    • Auth Protocol: SHA.
    • Auth Password: Str0ng@uth3ntic@ti0n.
    • Privacy Protocol: AES.
    • Privacy Password: Str0ngPriv@cy.
  • Click Next.
Linux SNMP step 1 9
Rocky Linux credentials

4. Select Metrics:

  • Choose CPU, Memory, Disk, Processes, etc.
  • Set thresholds (e.g., Disk warning at 80%, critical at 90%).

5. Apply Configuration:

  • Click Finish and apply changes.

6. Verify Monitoring:

  • Go to Monitoring > Hosts, find your Rocky Linux host, and check service statuses.

Troubleshooting Tips

SNMP Service Not Running

sudo systemctl status snmpd
sudo journalctl -u snmpd --no-pager | tail -20

Restart service if needed:

sudo systemctl restart snmpd

Host Appears Down in Nagios XI

  • Ensure SNMP is running
  • Verify firewall allows UDP 161
  • Double-check SNMP credentials

Conclusion

You’ve now configured Rocky Linux 9 to communicate with Nagios XI via SNMP. Whether using v2c or the more secure v3, SNMP provides essential monitoring capabilities for your Linux infrastructure without the need for additional agents.

For support:

]]> How to Monitor Rocky Linux 9 Using NCPA with Nagios XI https://library.nagios.com/tutorials/how-to-monitor-rocky-linux-9-using-ncpa-with-nagios-xi/ Thu, 27 Mar 2025 16:39:50 +0000 https://library.nagios.com/?p=53556 Efficient server monitoring is crucial for maintaining optimal system performance and minimizing downtime. The Nagios Cross-Platform Agent (NCPA) is a lightweight, agent-based tool that simplifies real-time monitoring for Linux systems like Rocky Linux 9. Unlike SNMP, NCPA leverages a secure, RESTful API to collect detailed system metrics, making it a powerful and secure monitoring solution for integration with Nagios XI.

This guide walks you through the installation and configuration process of NCPA on Rocky Linux 9, enabling comprehensive system monitoring through Nagios XI.

Prerequisites

Before proceeding, ensure you have:

  • A Rocky Linux 9 system with root or sudo privileges
  • Nagios XI installed and accessible, with the NCPA Wizard enabled
  • A stable internet connection for package downloads
  • SELinux set to enforcing or permissive (check with getenforce; adjust if needed)

Step 1: Install the Nagios Repository

Install the Nagios repository to access NCPA packages:

sudo rpm -Uvh https://repo.nagios.com/nagios/9/nagios-repo-9-1.el9.noarch.rpm
sudo yum update -y

Then refresh the package list:

sudo dnf clean all
sudo dnf update -y

Step 2: Install NCPA on Rocky Linux 9

Install the NCPA agent:

sudo dnf install ncpa -y

Verify the installation:

rpm -q ncpa

Expected output: ncpa-<version>.el9.x86_64

Step 3: Configure NCPA

Edit the configuration file to set your API token:

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

Locate:

community_string = mytoken

Replace with a strong, unique value:

community_string = Str0ngT0k3n2025

Replace mytoken with a secure token like Str0ngT0k3n2025. Save and exit.

Step 4: Enable and Start NCPA Service

Enable and start the NCPA service:

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

Ensure the output shows active (running).

Step 5: Configure Firewall Rules

Allow traffic to NCPA on port 5693:

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

Check the rule:

sudo firewall-cmd --list-ports

Step 6: Test NCPA Installation

Visit the NCPA web interface:

https://<RockyLinux9-IP>:5693/

Accept the certificate warning. Enter your API token to log in.

Step 7: Add Rocky Linux 9 Host to Nagios XI Using NCPA Wizard

1. Log into Nagios XI.

2. Go to Configure > Configuration Wizards.

3. Choose NCPA.

NCPA 9
NCPA

4. Enter the Rocky Linux 9 server’s IP and token.

rhel 4
Rocky Linux 9 Credentials

5. Click Next, choose system metrics (CPU, memory, disk, etc.).

6. Complete the wizard and apply the configuration.

Common Issues & Fixes

NCPA Not Running

Check logs:

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

Restart NCPA:

sudo systemctl restart ncpa

Host Appears Down in Nagios XI

Check firewall:

sudo firewall-cmd --list-ports

Verify NCPA is running:

sudo systemctl status ncpa

Incorrect API Token Error

Ensure the token matches ncpa.cfg, then:

sudo systemctl restart ncpa

Conclusion

You have successfully installed and configured NCPA on Rocky Linux 9 for monitoring with Nagios XI. This setup allows real-time visibility and proactive performance monitoring.

For further help:

]]>