Switch network configuration to netplan

Switch network configuration from ifupdown to netplan

In cloud servers created from ready-made images with Ubuntu 18.04, 20.04, and 22.04 operating systems, the ifupdown utility is used by default to configure the network.

You can switch network configuration from ifupdown to netplan — the procedure depends on whether the cloud-init agent is installed in the image.

Cloud-init is installed
Cloud-init is not installed

Connect to the server.
Remove ifupdown:
```
sudo apt purge ifupdown
```
Perform a programmatic reboot of the server:
```
sudo reboot now
```
The cloud-init agent will independently configure the network for netplan.

Connect to the server.
Create a configuration file for netplan:
```
nano /etc/neplan/config.yaml
```
Optional: enter the necessary network settings in the file. Examples can be found in the instructions Modify the cloud server network configuration file.
Check the syntax of the file:
```
sudo netplan try
```
Apply the settings:
```
sudo netplan apply
```