Oracle 监听lsnrctl命令启动报错（TNS-12537，TNS-12560，TNS-00507）

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LINUX登录oracle用户，通过lsnrctl start命令启动数据库时，报错如下：

“ [oracle@localhost ~]$ lsnrctl start

LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 29-APR-2015
07:38:11

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

Starting /home/oracle/app/oracle/product/11.2.0/dbhome_1/bin/tnslsnr:
please wait…

TNS-12537: TNS:connection closed
TNS-12560: TNS:protocol adapter error
Linux Error: 29: Illegal seek

“`

原因：
/etc/hosts内有两个localhost的主机名，监听冲突。

解决方法:
1、修改其中一个主机名，比如oracle，执行以下命令。

hostname oracle

2、在/etc/hosts内修改一个主机名为oracle。

[root@oracle etc]# cat /etc/hosts
127.0.0.1 localhost
::1 oracle

3、在/etc/sysconfig/network修改主机名为oracle。

[root@oracle etc]# cat /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=oracle

4、重新启动，在oracle用户下执行lsnrctl start。

[oracle@oracle ~]$ lsnrctl startLSNRCTL for Linux: Version 11.2.0.1.0 - Production on 29-APR-2015 07:46:27Copyright (c) 1991, 2009, Oracle.  All rights reserved.Starting /home/oracle/app/oracle/product/11.2.0/dbhome_1/bin/tnslsnr: please wait...TNSLSNR for Linux: Version 11.2.0.1.0 - ProductionSystem parameter file is /home/oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.oraLog messages written to /home/oracle/app/diag/tnslsnr/oracle/listener/alert/log.xmlListening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))STATUS of the LISTENER------------------------Alias                     LISTENERVersion                   TNSLSNR for Linux: Version 11.2.0.1.0 - ProductionStart Date                29-APR-2015 07:46:29Uptime                    0 days 0 hr. 0 min. 0 secTrace Level               offSecurity                  ON: Local OS AuthenticationSNMP                      OFFListener Parameter File   /home/oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.oraListener Log File         /home/oracle/app/diag/tnslsnr/oracle/listener/alert/log.xmlListening Endpoints Summary...  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))The listener supports no servicesThe command completed successfully

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