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Oracle Database 21c : Add Oracle Net Listener2022/02/16

Add Oracle Net Listener that is the network service on Oracle.
[1] Login as user [oracle] and input a command [netca] like follows.
[2] Check a box [Listener Configuration] and go next.
[3] Go to next.
[4] Set Listner's name. Set any name you like.
[5] This example goes next with keeping default [TCP].
[6] Set a port. This example goes next with keeping default.
[7] If you'd like to create more Listeners, Answer [Yes]. This example selects [No].
[8] Configuration completed.
[9] After creating Listener, [tnslsnr] listens on the port you configured like follows.
[oracle@dlp ~]$
ss -napt | grep 1521

LISTEN     0      128                     *:1521                   *:*     users:(("tnslsnr",pid=11694,fd=9))
TIME-WAIT  0      0      [::ffff:]:1521  [::ffff:]:60734

[oracle@dlp ~]$
tnsping localhost

TNS Ping Utility for Linux: Version - Production on 15-FEB-2022 21:21:02

Copyright (c) 1997, 2021, Oracle.  All rights reserved.

Used parameter files:

Used HOSTNAME adapter to resolve the alias
OK (10 msec)
[10] If Firewalld is running, allow listener port.
[root@dlp ~]#
firewall-cmd --add-port=1521/tcp

[root@dlp ~]#
firewall-cmd --runtime-to-permanent

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