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Ubuntu - Networking - Netplan - Configure networking with Netplan

Netplan is based on YAML based configuration system that makes configuration process very simple.

Netplan has replaced the old configuration file /etc/network/interfaces that we previously used for configuring network interfaces in Ubuntu.

Configuration Files

Netplan configuration files are at /etc/netplan/*.yaml.

Ubuntu server defaults to using system-networkd with the configuration file named 01-netcfg.yaml,
Ubuntu desktop generates a configuration file for Network-Manager named 01-network-manager-all.yaml.

NOTE: If you have multiple interfaces, use 02-network-manager-all.yaml for the second interface.

Netplan applies the configuration in the numerical order; i.e. the 01 file will be applied before the 02 file.

Find the name of the active network interfaces that you want to configure

ip a

NOTE: Note the interface name that you want to configure using Netplan.

Edit the netplan file.

/etc/netplan/01-network-manager-all.yaml

network:
    Version: 2
    Renderer: NetworkManager/ networkd
    ethernets:
       DEVICE_NAME:
          Dhcp4: yes/no
          Addresses: [IP_ADDRESS/NETMASK]
          Gateway: GATEWAY
          Nameservers:
             Addresses: [NAMESERVER_1, NAMESERVER_2]

Test

Before applying any changes, test the configuration file:

sudo netplan try

Apply Configuration

sudo netplan apply

NOTE: In case you see any error, try debugging to investigate the problem.

To run debug:

sudo netplan –d apply

Restart the network service

On Ubuntu Desktop

sudo systemctl restart network-manager

On Ubuntu Server

sudo systemctl restart system-networkd

Verify IP Address

ip a

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