TNS-12541: TNS:no listener
这次错误我总结一下有三种情况
1. 本地监听程序没有开起来
2. 服务器网络到客户端网络不通
3. Hosts里面配置问题

[oracle@his1 admin]$ tnsping crds3db2 客户端tnsping提示程序无监听

TNS Ping Utility for Linux: Version 11.2.0.2.0 - Production on 28-MAY-2014 11:11:57

Used parameter files:

Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.20.8)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = crds3db)))
TNS-12541: TNS:no listener
到oracle用户查看监听状态为正常，但是有一个节点1ip没有注册到节点2监听上面
[oracle@his1 ~]$ lsnrctl status

LSNRCTL for Linux: Version 11.2.0.2.0 - Production on 28-MAY-2014 10:56:09

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 11.2.0.2.0 - Production
Start Date                28-MAY-2014 10:09:10
Uptime                    0 days 0 hr. 46 min. 59 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /app/grid/product/11.2.0/grid/network/admin/listener.ora
Listener Log File         /app/grid/grid_base/diag/tnslsnr/his1/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.20.6)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM1", status READY, has 1 handler(s) for this service...
Service "crds3db" has 1 instance(s).
Instance "crds3db1", status READY, has 1 handler(s) for this service...
The command completed successfully

[root@his1 admin]# vi /etc/hosts
把里面删除his1 因为两个计算名冲突导致监听只注册到127.0.0.1
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1     his1 localhost.localdomain localhost
#::1            localhost6.localdomain6 localhost6
192.168.20.1       his1
192.168.20.2       his2
192.168.20.5       his-scan
192.168.20.6       his1-vip
192.168.20.7       his2-vip
192.168.20.15      hisdg
10.0.0.1           his1-priv
10.0.0.2           his2-priv
[grid@his2 ~]$ lsnrctl status

LSNRCTL for Linux: Version 11.2.0.2.0 - Production on 28-MAY-2014 11:18:14

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 11.2.0.2.0 - Production
Start Date                28-MAY-2014 11:06:52
Uptime                    0 days 0 hr. 11 min. 22 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /app/grid/product/11.2.0/grid/network/admin/listener.ora
Listener Log File         /app/grid/grid_base/diag/tnslsnr/his2/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.20.2)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.20.7)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM2", status READY, has 1 handler(s) for this service...
Service "crds3db" has 1 instance(s).
Instance "crds3db2", status READY, has 1 handler(s) for this service...
The command completed successfully
C:\Users\oracle>tnsping crds3db

TNS Ping Utility for 32-bit Windows: Version 11.2.0.1.0 - Production on 28-5月 -
2014 11:32:16

已使用的参数文件:
D:\app\mxq\product\11.2.0\dbhome_1\network\admin\sqlnet.ora

已使用 TNSNAMES 适配器来解析别名
尝试连接 (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.1
68.20.1)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = crds3db)))
OK (10 毫秒)
-
---THE END---

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RAC hosts没有配置导致TNS-12541: TNS:no listener

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