TNS-12541 TNS-12560 TNS-00511 Linux Error: 111 解决方法

查看下oracle监听服务：
lsnrctl status

结果如下：
LSNRCTL for Linux: Version 11.2.0.2.0 - Production on 01-AUG-2012 16:07:46

Copyright (c) 1991, 2011, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC_FOR_XE)))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
Linux Error: 111: Connection refused

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=wodeoraclefuwuqi)(PORT=1521)))

TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
Linux Error: 111: Connection refused
LSNRCTL for Linux: Version 11.2.0.2.0 - Production on 01-AUG-2012 16:07:46

找到问题原因了，上网google，发现这个问题和IP有关系，之前在调整apache虚拟服务器的时候，为了测试把/etc/hosts里的这一行：

127.0.0.1 localhost.localdomain localhost

删掉了，重新加上， 然后

lsnrctl start
之后
lsnrctl status
结果如下：

LSNRCTL for Linux: Version 11.2.0.2.0 - Production on 01-AUG-2012 16:11:35
Copyright (c) 1991, 2011, Oracle. All rights reserved.
Connecting to ( DESCRIPTION =( ADDRESS =( PROTOCOL = IPC )( KEY = EXTPROC_FOR_XE )))

STATUS of the LISTENER

Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.2.0 - Production
Start Date 01-AUG-2012 16:11:27
Uptime 0 days 0 hr. 0 min. 8 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Default Service XE
Listener Parameter File /u01/app/oracle/product/11.2.0/xe/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/sstdevel/listener/alert/log.xml

Listening Endpoints Summary...
( DESCRIPTION =( ADDRESS =( PROTOCOL = ipc )( KEY = EXTPROC_FOR_XE )))
( DESCRIPTION =( ADDRESS =( PROTOCOL = tcp )( HOST = wodeoraclefuwuqi )( PORT = 1521 )))

Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully

LSNRCTL for Linux: Version 11.2.0.2.0 - Production on 01-AUG-2012 16:11:35
Copyright (c) 1991, 2011, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC_FOR_XE)))
STATUS of the LISTENER

Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.2.0 - Production
Start Date 01-AUG-2012 16:11:27
Uptime 0 days 0 hr. 0 min. 8 sec
Trace Level off

Security ON: Local OS Authentication
SNMP OFF
Default Service XE
Listener Parameter File /u01/app/oracle/product/11.2.0/xe/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/sstdevel/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC_FOR_XE)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=wodeoraclefuwuqi)(PORT=1521)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully