How to Restart Network in Ubuntu | Serverspace

First you need to find out which network manager the system uses.

In this example we’re running Ubuntu 18.04 which uses Netplan to configure networks.

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What is Netplan used for?

Netplan is a new command-line network configuration utility introduced in Ubuntu 17.10 to manage and configure network settings easily in Ubuntu systems. It allows you to configure a network interface using YAML abstraction. It works in conjunction with the NetworkManager and systemd-networkd networking daemons (referred to as renderers, you can choose which one of these to use) as interfaces to the kernel.

It reads network configuration described in /etc/netplan/*.yaml and you can store configurations for all your network interfaces in these files.

So the first thing to do is to check what configuration files do we have in /etc/netplan/
We can check this out by using the command:

ls /etc/netplan/

Here we can see configuration file called “50-cloud-init.yaml”.

Now we need to read it to see configuration:

cat /etc/netplan/50-cloud-init.yaml

In the Renderer we can see the “NetworkManager” – that’s our active network manager.

To restart it simply run:

sudo service network-manager restart

And then to see it’s status run:

sudo service network-manager status

As we can see it’s active and running.

If you see “networkd” in the Renderer in the netplan configuration file you need to restart it with the command:

sudo systemctl restart systemd-networkd

And then to see it’s status run:

sudo systemctl status systemd-networkd

That’s all, network is restarted.
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