Oracle Listener.ora ignored

Run:

lsnrctl status LISTENERNAME

... where LISTENERNAME is the name of the listener that is listening on port 1531. You can get this name from your $ORACLE_HOME/network/admin/listener.ora file.

For example:

LISTENER1531 =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = TCP)(HOST = node1)(PORT = 1531))
      )
    )
  )

LISTENER1531 would be the listener name for the above listener.ora entry.

If you need to add databases to the listener, add an entry to the listener.ora, as follows:

SID_LIST_LISTENER1531 =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = YOURDB)
      (ORACLE_HOME = /u01/app/oracle/product/11.2.0/dbhome_1)
      (PROGRAM = extproc)
      (SID_NAME = YOURDB)
    )
  )

Obviously you'll need to add your own database and listener names & change the path to your $ORACLE_HOME.

You can reload the listener config with:

lsnrctl reload LISTENER1531

The above works fine for me with a `tnsnames.ora as follows:

YOURDB =
 (DESCRIPTION =
   (ADDRESS_LIST =
     (ADDRESS = (PROTOCOL = TCP)(Host = node1)(Port = 1531))
   )
 (CONNECT_DATA =
   (SERVICE_NAME = YOURDB)
 )
)

_{Community Wiki answer containing the solution originally added to the question by the author.}

Finally I found the solution: I didn't change permission to be owned by the oracle user and oinstall group for the database dir in which the Oracle software is. I think there are some scripts or programs related to listener and the oracle user could not run it.