A Bash Script to Assign IP Address to a Remote Linux System via SSH using nmcli Command.

nmcli_remote_ip_changer.sh

#!/usr/bin/env bash

# ------------------------------------------------------------------
# Script Name:   nmcli_remote_ip_changer.sh
# Description:   A Bash Script to Assign IP Address to a 
#                Remote Linux System via SSH using nmcli Command.
# Website:       https://gist.github.com/ostechnix
# Version:       1.0
# Usage:         chmod +x nmcli_remote_ip_changer.sh
#                ./nmcli_remote_ip_changer.sh
# ------------------------------------------------------------------

# Ask for the remote user and IP address of the machine
read -rp "Enter the remote username: " remote_user
read -rp "Enter the remote host IP address: " remote_host

# Connect to the remote machine and get the list of network connections
echo "Fetching list of network connections from the remote system..."
ssh "${remote_user}@${remote_host}" 'nmcli connection show'

# Prompt the user to choose a network connection
echo ""
read -rp "Enter the NAME of the connection you want to modify: " connection_name

# Ask for the new IP address to assign to this connection
read -rp "Enter the new IP address (in CIDR format, e.g., 192.168.1.10/24): " new_ip
read -rp "Enter the new Gateway (leave empty if unchanged): " new_gw
read -rp "Enter the new DNS (leave empty if unchanged, space separated for multiple): " new_dns

# Modifying the network connection using nmcli command
nmcli_modify_cmd="sudo nmcli connection modify \"${connection_name}\" ipv4.addresses ${new_ip} ipv4.method manual"
[ -n "$new_gw" ] && nmcli_modify_cmd+=" ipv4.gateway ${new_gw}"
[ -n "$new_dns" ] && nmcli_modify_cmd+=" ipv4.dns ${new_dns}"

# Command to restart NetworkManager service
nmcli_restart_cmd="sudo systemctl restart NetworkManager"

# Apply new IP address and restart NetworkManager
ssh -t "${remote_user}@${remote_host}" "
echo 'Applying the new IP address...'
${nmcli_modify_cmd} && echo 'IP address applied successfully.' || echo 'Failed to apply the new IP address.'

echo 'Restarting NetworkManager to apply changes...'
${nmcli_restart_cmd} && echo 'NetworkManager restarted successfully.' || echo 'Failed to restart NetworkManager.'

echo 'Please verify the connectivity to the remote system.'
"

Assign new IP address to a remote Linux system using nmcli_ip_changer script: