Commands
In this article, we’ll show you how to quickly add multiple IP addresses using NMCLI, a powerful command-line tool for configuring network settings on RHEL8/9
In this post, we’ll explore how NMCLI scripts can streamline IP address management tasks, making network administration smoother and more streamlined.
Managing IP addresses in a network environment can be a tedious and time-consuming task. From assigning static IPs to configuring DHCP settings, network administrators often find themselves grappling with numerous manual configurations. However, with the right tools and automation techniques, this process can become significantly more efficient. One such tool that has gained popularity among Linux users is NMCLI (Network Manager Command Line Interface).
NMCLI is a command-line tool provided by NetworkManager, a Linux utility for managing network connections. It allows users to control various aspects of network configuration, including IP addressing, DNS settings, and network interface management, all from the command line.
By leveraging NMCLI scripts, network administrators can automate repetitive tasks, reduce human error, and ensure consistent network configurations across multiple devices. Here are some key benefits of using NMCLI scripts:
| Key Features | Description |
|---|---|
| Efficiency | NMCLI scripts allow administrators to perform complex network configurations with a few simple commands, saving time and effort. |
| Consistency | Automating IP address management tasks ensures that network settings are applied consistently across all devices, minimizing the risk of misconfigurations. |
| Scalability | NMCLI scripts can be easily scaled to manage large networks with hundreds or thousands of devices, making them ideal for enterprise environments. |
| Flexibility | With NMCLI, administrators have fine-grained control over network configurations, allowing them to tailor settings to meet specific requirements. |
Let’s dive into some practical examples of how NMCLI scripts can be used to automate IP address management tasks (modify them as needed to suit your environment):
#!/bin/bash
IP_ADDRESS="$1"
GATEWAY="$2"
if [ -z "$IP_ADDRESS" ] || [ -z "$GATEWAY" ]; then
echo "Usage: $0 <IP_ADDRESS> <GATEWAY>"
exit 1
fi
nmcli con mod eth0 ipv4.method manual
nmcli con mod eth0 ipv4.address "$IP_ADDRESS"/24
nmcli con mod eth0 ipv4.gateway "$GATEWAY"
nmcli con up eth0
This script takes an IP address and gateway IP address as arguments and configures the Ethernet interface eth0 with a static IP address and gateway.
#!/bin/bash
nmcli con mod eth0 ipv4.method auto
nmcli con up eth0
This script sets the Ethernet interface eth0 to obtain an IP address automatically via DHCP.
#!/bin/bash
IP_ADDRESS="$1"
if [ -z "$IP_ADDRESS" ]; then
echo "Usage: $0 <IP_ADDRESS>"
exit 1
fi
nmcli con mod eth0 +ipv4.address "$IP_ADDRESS"/24
nmcli con up eth0
This script takes an IP address as an argument and adds it as a secondary IP address to the Ethernet interface eth0.
#!/bin/bash
DNS_SERVERS="$1"
if [ -z "$DNS_SERVERS" ]; then
echo "Usage: $0 <DNS_SERVER_1 DNS_SERVER_2 ...>"
exit 1
fi
nmcli con mod eth0 ipv4.dns "$DNS_SERVERS"
nmcli con up eth0
This script takes DNS server IP addresses as arguments and configures them for the Ethernet interface eth0.
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