Configuring a Static IP Address on Linux

Dedicated servers typically have a static IP configured by default. This guide covers how to set or change it manually.

Ubuntu 20.04+ (Netplan)

ls /etc/netplan/
nano /etc/netplan/00-installer-config.yaml

network:
  version: 2
  ethernets:
    eth0:
      addresses:
        - 203.0.113.10/24
      gateway4: 203.0.113.1
      nameservers:
        addresses:
          - 1.1.1.1
          - 8.8.8.8

netplan apply

Debian (interfaces file)

nano /etc/network/interfaces

auto eth0
iface eth0 inet static
    address 203.0.113.10
    netmask 255.255.255.0
    gateway 203.0.113.1
    dns-nameservers 1.1.1.1 8.8.8.8

systemctl restart networking

CentOS/AlmaLinux (nmcli)

nmcli con mod eth0 ipv4.addresses 203.0.113.10/24
nmcli con mod eth0 ipv4.gateway 203.0.113.1
nmcli con mod eth0 ipv4.dns "1.1.1.1 8.8.8.8"
nmcli con mod eth0 ipv4.method manual
nmcli con up eth0

Verify the Configuration

ip addr show eth0
ping -c 3 8.8.8.8

Add a Secondary IP Address

# Temporary (lost on reboot):
ip addr add 203.0.113.11/24 dev eth0

# Permanent (add to Netplan under addresses):
addresses:
  - 203.0.113.10/24
  - 203.0.113.11/24