1.telnet 方法

[root@node01:/]$ telnet localhost 1521
Trying ::1...
Connected to localhost.
Escape character is '^]'.
Connection closed by foreign host.

2.nmap方法​​

[root@node01:/]$ yum install nmap -y
[root@node01:/]$ nmap localhost -p 1521

Starting Nmap 6.40 ( http://nmap.org ) at 2021-12-10 13:45 CST
Nmap scan report for localhost (127.0.0.1)
Host is up (0.000042s latency).
Other addresses for localhost (not scanned): 127.0.0.1
PORT     STATE SERVICE
1521/tcp open  oracle

Nmap done: 1 IP address (1 host up) scanned in 0.24 seconds
[root@node01:/]$ nmap localhost -p 1522

Starting Nmap 6.40 ( http://nmap.org ) at 2021-12-10 13:45 CST
Nmap scan report for localhost (127.0.0.1)
Host is up (0.000039s latency).
Other addresses for localhost (not scanned): 127.0.0.1
PORT     STATE  SERVICE
1522/tcp closed rna-lm

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linux