TNS-12547: TNS:lost contact 错误解决

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本文记录了在Enterprise Linux AS release 4上安装Oracle 10g R2后遇到的Listener启动失败问题及解决过程。主要错误为TNS-12547:TNS:lostcontact等，通过修改/etc/hosts文件并清空listener.log日志文件解决了问题。

新安装的Enterprise Linux Enterprise Linux AS release 4,在安装Oracle 10gR2之后,Listener不能启动.
报错信息如下:

TNS-12547: TNS:lost contact
TNS-12560: TNS:protocol adapter error
TNS-00517: Lost contact
Linux Error: 104: Connection reset by peer

[oracle@test ~]$ lsnrctl start

LSNRCTL for Linux: Version 10.2.0.3.0 - Production on 19-JUL-2007 06:46:03

Starting /u01/app/oracle/product/10.2.0/db_1/bin/tnslsnr: please wait...

TNSLSNR for Linux: Version 10.2.0.3.0 - Production
System parameter file is /u01/app/oracle/product/10.2.0/db_1/network/admin/listener.ora
Log messages written to /u01/app/oracle/product/10.2.0/db_1/network/log/listener.log
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=test.benbo.com)(PORT=1521)))
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC0)))

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test.benbo.com)(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=EXTPROC0)))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
Linux Error: 111: Connection refused

[oracle@test ~]$ lsnrctl status

LSNRCTL for Linux: Version 10.2.0.3.0 - Production on 19-JUL-2007 06:45:48

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test.benbo.com)(PORT=1521)))
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=IPC)(KEY=EXTPROC0)))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
Linux Error: 111: Connection refused

[oracle@test ~]$ ping test.benbo.com
PING test.benbo.com (192.168.109.200) 56(84) bytes of data.
64 bytes from test.benbo.com (192.168.109.200): icmp_seq=0 ttl=64 time=3.56 ms
64 bytes from test.benbo.com (192.168.109.200): icmp_seq=1 ttl=64 time=0.112 ms
64 bytes from test.benbo.com (192.168.109.200): icmp_seq=2 ttl=64 time=0.055 ms

--- test.benbo.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 0.055/1.245/3.569/1.643 ms, pipe 2
[oracle@test ~]$ cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
192.168.109.200 test.benbo.com test

发现/etc/hosts中并没有127.0.0.1 localhost.

所以，不要盲目的把 127.0.0.1 localhost 删除掉

修改/etc/hosts,修改后如下
[oracle@test ~]$ cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost
192.168.109.200 test.hehe.com test

重新启动listner,OK.
[oracle@test ~]$ lsnrctl start

LSNRCTL for Linux: Version 10.2.0.3.0 - Production on 19-JUL-2007 06:48:04

Starting /u01/app/oracle/product/10.2.0/db_1/bin/tnslsnr: please wait...

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test.benbo.com)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 10.2.0.3.0 - Production
Start Date 19-JUL-2007 06:48:06
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/10.2.0/db_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/product/10.2.0/db_1/network/log/listener.log
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=test.benbo.com)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC0)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
[oracle@test ~]$

在网上搜索一下,另一种TNS-12547: TNS:lost contact的情况,具体错误如下:
TNS-12547: TNS:lost contact
TNS-12560: TNS:protocol adapter error
TNS-00517: Lost contact
Linux Error: 32: Broken pipe

原因:listener.log文件超过2G
解决方法:清空日志文件
[oracle@test ~]$ cd $ORACLE_HOME/network/log
[oracle@test log]$ cat /dev/null > listener.log