nmap -sU -p PORT IP

For example Galera requires 4567/udp port opened and I needed to check if it’s opened on one of the nodes.

root@host:~# nmap -sU -p 4567 10.10.20.20

Starting Nmap 7.01 ( https://nmap.org ) at 2018-02-04 10:04 UTC
Nmap scan report for 10.10.20.20
Host is up (0.00043s latency).
PORT     STATE  SERVICE
4567/udp closed unknown
MAC Address: AB:AB:AB:AB:AB:AB (Unknown)

Nmap done: 1 IP address (1 host up) scanned in 0.52 seconds

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