This is a YAML based configuration system, which simplifies the configuration process.
This new tool replaces the configuration file (
/etc/network/interfaces) that had previously been used to configure the network interfaces on Ubuntu.
The configuration files are now located as YAML files at
/etc/netplan/*.yaml. Make sure to respect the YAML standards when you edit the file as it might not work if there is a syntax error in your configuration.
01-netcfg.yaml is used to configure the first interface. Below you can find the default configuration for an interface using DHCP:
# This file describes the network interfaces available on your system # For more information, see netplan(5). network: version: 2 renderer: networkd ethernets: enp1s0f0: dhcp4: yes
Following you can see a list of the most common configuration options and a description of how they are used.
|addresses||[192.168.1.2/24, 220.127.116.11/32]||A list of IP addresses to be assigned to an interface. The format uses CIDR notation.|
|gateway4||192.168.1.1||The IP address of your local IPv4 gateway.|
|dhcp4||true||Set whether DHCP is enabled for IPv4 – true of false|
Set whether DHCP is enabled for IPv6 – true of false
Configuration of a failover IP with Netplan
To configure a failover IP, you have to edit the file
/etc/netplan/01-netcfg.yaml and configure a static networking for your server. The IP addresses have to be written with their CIDR notation. The netmask is
/24 for the principal IP of the server and
/32 for each failover IP. Your configuration file should look like in the following example:
network: version: 2 renderer: networkd ethernets: enp1s0f0: addresses: [18.104.22.168/24, 22.214.171.124/32] gateway4: 126.96.36.199 nameservers: addresses: [ "188.8.131.52", "184.108.40.206" ]
Once you have edited and saved the file you can reload the configuration with the following command:
sudo netplan apply
Configuration of a failover IP in a virtual machine
When you configure a failover IP inside a virtual machine, you have to specify the route that will be used by the VM. Your configuration file should look like in the following example:
network: version: 2 renderer: networkd ethernets: eth0: dhcp4: no dhcp6: no addresses: [fail.over.ip.address/32] gateway4: 220.127.116.11 nameservers: addresses: [18.104.22.168, 22.214.171.124] routes: - to: 126.96.36.199/32 via: fail.over.ip.address scope: link