Ubuntu 18.04 Server
To configure a static IP address on your Ubuntu 18.04 server you need to modify a relevant netplan network configuration file within /etc/netplan/ directory.
For example you might find there a default netplan configuration file called 01-netcfg.yaml or 50-cloud-init.yaml with a following content instructing the networkd deamon to configure your network interface via DHCP:
# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
version: 2
renderer: networkd
ethernets:
enp0s3:
dhcp4: yes
To set your network interface enp0s3 to static IP address 192.168.1.222 with gateway 192.168.1.1 and DNS server as 8.8.8.8 and 8.8.4.4 replace the above configuration with the one below.
WARNING:
You must adhere to a correct code indent for each line of the block. In other words the prefix number of spaces for each line is important. Othersiwe you may end up with an error message similar to: Invalid YAML at //etc/netplan/01-netcfg.yaml line 7 column 6: did not find expected key
# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
version: 2
renderer: networkd
ethernets:
enp0s3:
dhcp4: no
addresses: [192.168.1.222/24]
gateway4: 192.168.1.1
nameservers:
addresses: [8.8.8.8,8.8.4.4]
Once ready apply changes with:
$ sudo netplan apply
In case you run into some issues execute:
$ sudo netplan --debug apply
Netplan and systemd-networkd
ifupdown (including the familiar ifup and ifdown utilities) has been replaced by Netplan. Netplan is a simplified interface for configuring Linux networking, where YAML files in /etc/netplan are used to generate configuration information for either NetworkManager or — in the case of new Ubuntu Server installations – systemd-networkd.
The ip link set command is a replacement for ifup and ifdown. You can learn more about it in the How To Configure Network Interfaces and Addresses section of our IPRoute2 Tools tutorial.
For more information on configuring Netplan, see the official documentation. Details on how to use and configure systemd-networkd are available in the systemd-networkd.service and systemd.network man pages.
The command networkctl can output a summary of your network devices:
networkctl
OutputIDX LINK TYPE OPERATIONAL SETUP
1 lo loopback carrier unmanaged
2 eth0 ether routable configured
Run the command with the status flag and it will print the state of each IP address on the system:
networkctl status
Output● State: routable
Address: 192.0.2.10 on eth0
203.0.113.241 on eth0
2001:DB8:68be:caff:fe4c:c963 on eth0
Gateway: 203.0.113.1 (ICANN, IANA Department) on eth0
DNS: 203.0.113.2
203.0.113.3
