In this article I will give examples of network configuration using Netplan.
I also note that for example, starting with Ubuntu version 18.04, Netplan is used by default.
The configuration files are located in the /etc/netplan/ directory.
Usually, after installing the system, you can see the /etc/netplan/config.yaml file or /etc/netplan/50-cloud-init.yaml.
Inside each block, two spaces must be indented; tabs cannot be used!
For example, to configure a DHCP client on the enp3s0 network interface:
network:
ethernets:
enp0s3:
dhcp4: true
version: 2
I will give an example of setting a static IP address:
network:
ethernets:
enp0s3:
addresses:
- 10.10.10.2/24
gateway4: 10.10.10.1
nameservers:
addresses: [10.10.10.1, 1.1.1.1]
version: 2
Example of configuring multiple network interfaces:
network:
ethernets:
enp0s3:
dhcp4: true
enp0s8:
addresses:
- 10.10.10.1/24
version: 2
You can specify multiple IP addresses on one network interface:
network:
ethernets:
enp0s3:
dhcp4: true
enp0s8:
addresses:
- 10.10.10.1/24
- 10.10.20.1/24
gateway4: 10.22.1.1
version: 2
Example of specifying multiple IP addresses and multiple gateways:
network: version: 2 renderer: networkd ethernets: enp3s0: addresses: - 9.0.0.9/24 - 10.0.0.10/24 - 11.0.0.11/24 routes: - to: 0.0.0.0/0 via: 9.0.0.1 metric: 100 - to: 0.0.0.0/0 via: 10.0.0.1 metric: 100 - to: 0.0.0.0/0 via: 11.0.0.1 metric: 100
Example of setting a Wi-Fi interface:
network: version: 2 renderer: networkd wifis: wlp2s0b1: dhcp4: no dhcp6: no addresses: [192.168.0.21/24] gateway4: 192.168.0.1 nameservers: addresses: [192.168.0.1, 8.8.8.8] access-points: "network_ssid_name": password: "**********"
VLAN configuration example:
network:
version: 2
ethernets:
ens3:
addresses:
- 192.168.122.201/24
gateway4: 192.168.122.1
nameservers:
addresses: [192.168.122.1]
ens8: {}
vlans:
vlan101:
id: 101
link: ens8
addresses: [192.168.101.1/24]
vlan102:
id: 102
link: ens8
addresses: [192.168.102.1/24]
Link aggregation and vlan configuration:
network:
version: 2
renderer: networkd
ethernets:
enp3s0f0:
dhcp4: no
ensp3s0f1:
dhcp4: no
bonds:
bond0:
dhcp4: no
interfaces: [enp3s0f0, enp3s0f1]
parameters:
mode: 802.3ad
mii-monitor-interval: 1
vlan10:
id: 10
link: bond0
dhcp4: no
addresses: [10.10.10.2/24]
routes:
- to: 10.10.10.2/24
via: 10.10.10.1
on-link: true
vlan20:
id: 20
link: bond0
dhcp4: no
addresses: [10.10.11.2/24]
gateway: 10.10.11.1
nameserver:
addresses: [8.8.8.8]
To test the new configuration, execute:
sudo netplan try
And for confirmation, press the “ENTER” key, if the connection is lost and not press “ENTER”, then after 120 seconds the previous configuration will be restored.
You can immediately apply the configuration without testing:
sudo netplan apply
In case of errors, see the debugging information:
netplan --debug generate
See also my articles:
Adding Routes
VLAN Generation Script for Netplan
Configuring the Network in Linux