NetBox Enterprise Requirements for Ubuntu

Ubuntu-specific preparation steps. See the main requirements document for general requirements and special cases.

Firewall Configuration

Choose either direct iptables (Required Commands) OR UFW (Optional section), not both, to avoid conflicts.

Tested Versions

• Ubuntu 22.04 LTS (Jammy Jellyfish)
• Ubuntu 24.04 LTS (Noble Numbat)

Required Commands (Direct iptables approach)

# Disable swap
sudo swapoff -a
sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

# Install iptables-persistent
sudo apt update && sudo apt install -y iptables-persistent

# Configure pod networking (required for Kubernetes - skip if using UFW)
sudo iptables -I FORWARD -s 10.244.0.0/17 -d 10.244.128.0/17 -j ACCEPT
sudo iptables -I OUTPUT -s 10.244.0.0/17 -d 10.244.128.0/17 -j ACCEPT
sudo iptables -I FORWARD -s 10.244.128.0/17 -d 10.244.0.0/17 -j ACCEPT
sudo iptables -I OUTPUT -s 10.244.128.0/17 -d 10.244.0.0/17 -j ACCEPT
sudo netfilter-persistent save

# Load kernel modules (identical to RHEL requirements)
sudo modprobe br_netfilter ip_vs ip_vs_rr ip_vs_wrr ip_vs_sh overlay
cat <<EOF | sudo tee /etc/modules-load.d/kubernetes.conf
br_netfilter
ip_vs
ip_vs_rr
ip_vs_wrr
ip_vs_sh
overlay
EOF
sudo sysctl --system

# Reboot and proceed with installation
sudo reboot now

Optional: If Using UFW

UFW and iptables

If using UFW, apply pod networking rules through UFW instead of direct iptables to avoid conflicts.

# Install and configure UFW for Kubernetes ports
sudo apt install -y ufw
sudo ufw --force enable
sudo ufw allow 6443/tcp
sudo ufw allow 2379:2380/tcp
sudo ufw allow 10250,10251,10252,10255,5473,10257,10259/tcp
sudo ufw allow 30000:32767/tcp
sudo ufw allow 4789/udp
sudo ufw allow 179/tcp

# Configure pod networking through UFW (instead of direct iptables)
sudo ufw route allow from 10.244.0.0/17 to 10.244.128.0/17
sudo ufw route allow from 10.244.128.0/17 to 10.244.0.0/17

sudo ufw reload

After reboot, follow the installation guide.