今天启动监听lsnrctl start 发现报错TNS-12547  TNS-12560 TNS-00517
[oracle@ogg1 ~]$ lsnrctl start


LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 03-JAN-2015 18:40:10


Copyright (c) 1991, 2013, Oracle.  All rights reserved.


Starting /u01/app/oracle/product/11.2/db_1/bin/tnslsnr: please wait...


TNSLSNR for Linux: Version 11.2.0.4.0 - Production
System parameter file is /u01/app/oracle/product/11.2/db_1/network/admin/listener.ora
Log messages written to /u01/app/oracle/diag/tnslsnr/ogg1/listener/alert/log.xml
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=ogg1)(PORT=1521)))
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))


Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=ogg1)(PORT=1521)))
TNS-12547: TNS:lost contact
 TNS-12560: TNS:protocol adapter error
  TNS-00517: Lost contact
   Linux Error: 104: Connection reset by peer
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
TNS-12541: TNS:no listener
 TNS-12560: TNS:protocol adapter error
  TNS-00511: No listener
   Linux Error: 111: Connection refused

在网上找到了解决方法，具体原因不清楚
解决办法：查看/etc/hosts 文件内容
[root@ogg1 ~]# cat /etc/hosts
127.0.0.1       ogg1
192.168.3.213   ogg1

将127.0.0.1 后面添加localhost
[root@ogg1 ~]# vi /etc/hosts
127.0.0.1      ogg1 localhost 
192.168.3.212  ogg1