Provision secondary interfaces (both nodes)

Provisioning secondary interfaces is not strictly necessary. All that is required is an IP address reserved in the appropriate subnet for the purposes of serving as a virtual IP. However, provisioning secondary interfaces in a subnet used solely for SMB traffic allows server-client traffic to be segregated from storage traffic and reduces possible contention in high-performance use cases.

$ sudo nano /etc/netplan/01-netcfg.yaml

Example configuration:

# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
	version: 2
	renderer: networkd
	ethernets:
		ens18:
			dhcp4: yes
		ens19:
			dhcp4: yes