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Issue Adding a new IP to a server using Netplan drops network connection

JoeShmoe

New Pleskian
This was reported before, but still present in Obsidian 18.0.27 Update #1.

When adding a new IP (IPv4 in my case) via Tools & Settings -> IP Addresses, on a server with Netplan installed, Plesk instead of only adding a new IP to /etc/netplan/10-plesk.yaml, deletes previous entries completely and adds the new IP. This causes the server to be immediately inaccessible from network.
My server had one IPv4 and one IPv6 present before that (I suspect this is required to replicate the bug).

Tested on Ubuntu 18.04.4
 
I'm very much willing to help investigate this issue.
This is a critical issue, I still cannot add new IPs to my server because of it.
 
The OVH server with Ubuntu 18 was configured via systemd network unit.
On Ubuntu 18, Plesk uses netplan utility, which is the default configuration mechanism to configure the network interfaces.

Contact OVH to configure the network interfaces via netplan instead of SystemD network unit.
As a workaround, if the SystemD network unit configuration remains:
  1. Configure the additional IP address manually on the OVH server via SystemD network unit
  2. Log in to Plesk GUI
  3. Go to Tools & Settings > IP Addresses > Reread
 
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