Shulou(Shulou.com)06/02 Report--

I. background

Netplan is a new command line network configuration utility introduced in Ubuntu 17.10 to easily manage and configure network settings in Ubuntu systems. It allows you to configure network interfaces using YAML abstractions. It can be used as an interface to the kernel along with NetworkManager and systemd-networkd network daemons, called renderers, which you can choose to use.

It reads the network configuration described in / etc/netplan/*.ymal and can store the configuration of all network interfaces in these files.

In this article. We will explain how to use the Netplan utility to configure network static or dynamic IP addresses for network interfaces in Ubuntu 18.04.

II. Solutions

List all active network interfaces on Ubuntu

First, you need to determine the network interface to configure. You can use the ifconfig command to list all connected network interfaces in the system, as shown in the figure.

Ifconfig-a

Check the network interface in Ubuntu

From the output of the above command, we have two interfaces connected to the Ubuntu system: an Ethernet interface and a loopback interface.

Ubuntu sets static IP address

In this example, we configure the ens33 Ethernet network interface with a static IP. Use vim to open the netplain configuration file as shown.

Important: if the YAML file was not created by the distribution installer, you can use this command to generate the required configuration for the renderer.

Sudo netplan generate

In addition, automatically generated files may have different file names on desktops, servers, cloud instances, etc. (such as 01-network-manager-all.ymal or 01-netcfg.yaml), but all files under / etc/netplan/*.yaml will be read by netplan.

Sudo vim / etc/netplan/xxxx.ymal

Then add the following configuration in the ethernet section.

Network: ethernets: ens33: addresses:-192.168.4.254 addresses 24 dhcp4: false gateway4: 192.168.4.2 nameservers: addresses:-8.8.8.8 search: [] version: 2

Description:

Ens33: network interface name

Dhcp4: receives the dhcp attribute of the IPV4 interface

Dhcp6: receives the dhcp attribute of the IPV6 interface

Addresses: the static address sequence of the interface

Gateway4: the IPV4 address of the default gateway

Nameservers:DNS server address, separated by a sign

After the addition is complete, your profile should have the following, as shown in the following screenshot.

The address attribute of the interface expects a sequence entry, such as [192.168.4.254x24, "20001: 1:: 1Unix64"] or [192.168.1.254Unix24,] (refer to the netplan man page for more information).

Configure static IP in Ubuntu

Save the file and exit. Then apply the most recent network changes using the following netplan command.

Sudo netplan apply

Now verify all available network interfaces again, and the ens33 Ethernet interface should now be connected to the local network and have an IP address, as shown in the screenshot below.

Ifconfig-a

Verify the network interface in Ubuntu

Ubuntu sets dynamic IP address

To configure the ens33 Ethernet interface to dynamically receive IP addresses through DHCP, you only need to use the configuration.

Network: ethernets: ens33: dhcp6: true dhcp4: true version: 2

Save the file and exit. Then apply the most recent network changes using the following netplan command.

Sudo netplan applyifconfig-a

From now on, your system will learn IP addresses dynamically from the router.

You can find more information and configuration options by viewing the netplan man page.

Man netplan

At this time, you have successfully configured the network static IP address to your Ubuntu server.

Summary

The above is the method of setting static IP in Ubuntu 18.04Server introduced by the editor. I hope it will be helpful to you. If you have any questions, please leave me a message and the editor will reply to you in time. Thank you very much for your support to the website!

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