Prerequisites

• Void Linux system with sudo or root privileges.
• A Nagios XI instance with network access to the Void Linux host.
• Network port 5693/tcp open between both systems.
• Basic packages installed: curl, rpmextract, python3, ncurses-compat-libs, and cpio.

Step 1: Install Required Tools

Void Linux doesn’t natively support RPM packages, but rpmextract and cpio allow extraction of the NCPA RPM:

sudo xbps-install -Sy curl rpmextract cpio python3 ncurses-compat-libs

sudo xbps-install -Sy curl rpmextract cpio python3 ncurses-compat-libs

• rpmextract provides rpm2cpio, and ncurses-compat-libs ensures compatibility for NCPA’s dependencies.

Verify Installation:

curl --version
rpm2cpio --version
cpio --version
python3 --version

curl --version
rpm2cpio --version
cpio --version
python3 --version

Step 2: Download and Extract the NCPA RPM

1. Create a working directory:

mkdir -p ~/ncpa && cd ~/ncpa

mkdir -p ~/ncpa && cd ~/ncpa

2. Download the latest NCPA RPM:

curl -O https://assets.nagios.com/downloads/ncpa3/ncpa-latest-1.x86_64.rpm

curl -O https://assets.nagios.com/downloads/ncpa3/ncpa-latest-1.x86_64.rpm

3. Extract the contents:

rpm2cpio ncpa-latest-1.x86_64.rpm | cpio -idmv

rpm2cpio ncpa-latest-1.x86_64.rpm | cpio -idmv

Step 3: Copy NCPA Files

Move the extracted files into appropriate directories:

sudo cp -r ./usr/* /usr/
sudo cp -r ./etc/* /etc/
sudo cp -r ./var/* /var/

sudo cp -r ./usr/* /usr/
sudo cp -r ./etc/* /etc/
sudo cp -r ./var/* /var/

• Note: Void Linux’s filesystem is mutable, so these files persist across reboots unless manually removed or overwritten by updates.

Step 4: Configure NCPA

Set a secure token for NCPA authentication:

1. Edit the configuration file:

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

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

2. Set a strong token:

• Locate:

community_string = mytoken

community_string = mytoken

• Replace with:

community_string = Str0ngT0k3n2025

community_string = Str0ngT0k3n2025

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

Step 5: Create runit Service for NCPA

Since Void Linux uses runit, create a service manually.

1. Create service directory:

sudo mkdir -p /etc/sv/ncpa

sudo mkdir -p /etc/sv/ncpa

2. Create the run script:

sudo nano /etc/sv/ncpa/run

sudo nano /etc/sv/ncpa/run

Add the following:

#!/bin/sh
exec /usr/local/ncpa/ncpa_listener

#!/bin/sh
exec /usr/local/ncpa/ncpa_listener

3. Make it executable:

sudo chmod +x /etc/sv/ncpa/run

sudo chmod +x /etc/sv/ncpa/run

4. Enable the service:

sudo ln -s /etc/sv/ncpa /var/service/

sudo ln -s /etc/sv/ncpa /var/service/

5. Confirm it’s running:

pgrep -f ncpa_listener

pgrep -f ncpa_listener

Step 6: Open Firewall Port 5693

If using iptables, run:

sudo iptables -I INPUT -p tcp --dport 5693 -j ACCEPT

sudo iptables -I INPUT -p tcp --dport 5693 -j ACCEPT

Make persistent:

sudo iptables-save > /etc/iptables/rules.v4

sudo iptables-save > /etc/iptables/rules.v4

Verify:

sudo iptables -L -n | grep 5693

sudo iptables -L -n | grep 5693

Step 7: Test NCPA Access

Access the NCPA interface:

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

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

Login with the token: Str0ngT0k3n2025

Step 8: Configure Nagios XI

1. Log into Nagios XI.
2. Go to Configure > Configuration Wizards.
3. Select NCPA.
4. Enter:
   • IP: Void Linux IP
   • Port: 5693
   • Token: Str0ngT0k3n2025
5. Choose metrics (CPU, memory, disk, etc.) and apply the configuration.

Troubleshooting

• Check process:

pgrep -f ncpa_listener

pgrep -f ncpa_listener

• Check logs:

cat /usr/local/ncpa/var/log/ncpa.log

cat /usr/local/ncpa/var/log/ncpa.log

• Test connectivity:

nc -zv <VoidLinux-IP> 5693

nc -zv <VoidLinux-IP> 5693

Conclusion

You’ve successfully installed and configured NCPA on Void Linux and integrated it with Nagios XI. Although Void Linux is non-standard in terms of service management and package formats, NCPA works with minor manual setup. For advanced features, explore NCPA’s passive checks or API-based monitoring.

Resources:

• Nagios NCPA
• Void Linux Documentation
• Nagios Knowledgebase