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Asked: 2026-06-06T16:33:13+00:00

I created a listener (using netca) called listener. When I start the listener (using

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I created a listener (using netca) called listener.

When I start the listener (using lsnrctl start) I have the following log.

LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 24-JUN-2012 17:56:35

Copyright (c) 1991, 2009, Oracle.  All rights reserved.

Starting /opt/oracle/eesrv/11.2.0/db1/bin/tnslsnr: please wait...

TNSLSNR for Linux: Version 11.2.0.1.0 - Production
System parameter file is /opt/oracle/network/listener.ora
Log messages written to /opt/oracle/diag/tnslsnr/sakura/listener/alert/log.xml
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost.localdomain)(PORT=1521)))

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=sakura)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date                24-JUN-2012 17:56:35
Uptime                    0 days 0 hr. 0 min. 10 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /opt/oracle/network/listener.ora
Listener Log File         /opt/oracle/diag/tnslsnr/sakura/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost.localdomain)(PORT=1521)))
The listener supports no services
The command completed successfully

Q. Why is the listener listening on localhost and not on sakura ?!?

Here is my listener.ora file (where I clearly specify to use sakura):

TRACE_DIRECTORY_PROD = /var/opt/oracle/otk/1.0/log/network/trace

SUBSCRIBE_FOR_NODE_DOWN_EVENT_PROD = OFF

LISTENER = (DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = sakura)(PORT = 1521))
) )

ADR_BASE_LISTENER = /opt/oracle

LOG_DIRECTORY_PROD = /var/opt/oracle/otk/1.0/log/network

Why did I do wrong ?

Thanks

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1 Answer

  1. Editorial Team

    Expanded from comment

    It appears that sakura is resolving to the same address as localhost.localdomain, i.e. 127.0.0.1. This suggests that there is an entry in the /etc/hosts that is mapping sakura to 127.0.0.1.

    You can either:

    • remove that mapping;
    • change it to show an external IP address, if it doesn’t resolve to one automatically;
    • change your listener.ora to use a fully-qualified domain name if you have one that resolves to the external IP, e.g. sakura.example.com;
    • or change your listener.ora to use the external IP address directly with no lookup.

    The last option might be the simplest, unless you have a DHCP-assigned IP address; and os what @dseibert suggested.

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