遇到一个监听问题：
环境：Oracle Enterprise Linux 5.4 + 11.2.0.3.14
问题：使用lsnrctl 指令启动监听没问题，过十几秒后监听自动关闭，再启动，反复出现该问题。

根据经验，监听问题一般和/etc/hosts文件有关，瞄了一眼，似乎没有问题。

接下来第一时间当然去看日志啦。
$ORACLE_HOME/network/trace目录下找到了日志，并没有什么有用的信息。

------------监听日志在哪？（trace和log查看方式差不多）

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[oracle@oracle151 trace]$ lsnrctl
LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 05-DEC-2015 15:12:31
Copyright (c) 1991, 2011, Oracle. All rights reserved.
Welcome to LSNRCTL, type "help" for information.
LSNRCTL> show
The following operations are available after show
An asterisk (*) denotes a modifier or extended command:
rawmode displaymode
rules trc_file
trc_directory trc_level
log_file log_directory
log_status current_listener
inbound_connect_timeout startup_waittime
snmp_visible save_config_on_stop
dynamic_registration enable_global_dynamic_endpoint
oracle_home pid
connection_rate_limit
LSNRCTL> show log_directory
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oracle151.example.com)(PORT=1521)))
LISTENER parameter "log_directory" set to /u01/app/oracle/diag/tnslsnr/oracle151/listener/alert
The command completed successfully
LSNRCTL> show log_status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oracle151.example.com)(PORT=1521)))
LISTENER parameter "log_status" set to ON
The command completed successfully
LSNRCTL> show log_file
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oracle151.example.com)(PORT=1521)))
LISTENER parameter "log_file" set to /u01/app/oracle/diag/tnslsnr/oracle151/listener/alert/log.xml
The command completed successfully

于是开始怀疑防火墙，检查了一下发现没关，使用chkconfig指令把防火墙关了，还是不行，于是重启，出现了新的报错：

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[oracle@oracle152 log]$ lsnrctl start
LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 05-DEC-2015 15:14:27
Copyright (c) 1991, 2011, Oracle. All rights reserved.
Starting /u01/app/oracle/product/11.2.0/db_1/bin/tnslsnr: please wait...
TNS-12537: TNS:connection closed
TNS-12560: TNS:protocol adapter error
TNS-00507: Connection closed
Linux Error: 29: Illegal seek

不死心，又回去翻/etc/hosts文件，天了噜！似乎发现了错误：

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[oracle@oracle152 log]$ more /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
10.3.52.151 oracle151.example.com oracle151
10.3.52.152 oracle152.example.com oracle152

文件少了一行127.0.0.1的记录，重新加上：

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[oracle@oracle152 log]$ more /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
10.3.52.151 oracle151.example.com oracle151
10.3.52.152 oracle152.example.com oracle152

再次启动监听

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[oracle@oracle152 log]$ lsnrctl start
LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 05-DEC-2015 15:18:32
Starting /u01/app/oracle/product/11.2.0/db_1/bin/tnslsnr: please wait...
TNSLSNR for Linux: Version 11.2.0.3.0 - Production
System parameter file is /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Log messages written to /u01/app/oracle/diag/tnslsnr/oracle152/listener/alert/log.xml
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=oracle152.example.com)(PORT=1521)))
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oracle152.example.com)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.3.0 - Production
Start Date 05-DEC-2015 15:18:33
Uptime 0 days 0 hr. 0 min. 0 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/oracle152/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=oracle152.example.com)(PORT=1521)))
The listener supports no services
The command completed successfully

监听成功启动。
注：The listener supports no services是因为没有做静态注册，并没有问题。

总结：二十多年白活了，粗心的毛病还是没有改掉，第一次看的时候居然没有发现错误。别拉着我，让我哭一会。

ITPub博客

监听自动关闭（TNS-12537/TNS-12560/TNS-00507/Linux Error: 29: Illegal seek）

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