hosts中缺少localhost.localdomain导致监听启动时间超长

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标题:hosts中缺少localhost.localdomain导致监听启动时间超长

作者:惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

0、基本信息

[oracle@localhost ~]$ uname -a
Linux localhost.localdomain 2.6.18-194.el5PAE #1 SMP Tue Mar 16 22:00:21 EDT 2010 i686 i686 i386 GNU/Linux
[oracle@localhost ~]$ hostname
localhost.localdomain
[oracle@localhost ~]$ /sbin/ifconfig 
eth0      Link encap:Ethernet  HWaddr 00:14:22:10:96:AE  
          inet addr:192.168.9.66  Bcast:192.168.11.255  Mask:255.255.252.0
          inet6 addr: fe80::214:22ff:fe10:96ae/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:6597875 errors:0 dropped:0 overruns:0 frame:0
          TX packets:9785915 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          RX bytes:2526369384 (2.3 GiB)  TX bytes:295978844 (282.2 MiB)

eth0:1    Link encap:Ethernet  HWaddr 00:14:22:10:96:AE  
          inet addr:外网ip  Bcast:211.155.227.175  Mask:255.255.255.240
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

eth1      Link encap:Ethernet  HWaddr 00:14:22:10:96:AF  
          inet addr:192.168.11.50  Bcast:192.168.11.255  Mask:255.255.252.0
          inet6 addr: fe80::214:22ff:fe10:96af/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:999903 errors:0 dropped:0 overruns:0 frame:0
          TX packets:283 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          RX bytes:104688608 (99.8 MiB)  TX bytes:22777 (22.2 KiB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:8816738 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8816738 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:2726275798 (2.5 GiB)  TX bytes:2726275798 (2.5 GiB)
[oracle@localhost ~]$ more /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=yes
HOSTNAME=localhost.localdomain

1、hosts文件

[oracle@localhost ~]$ more /etc/hosts
127.0.0.1                 localhost

2、监听文件

[oracle@localhost ~]$ more /opt/oracle/product/10g/network/admin/listener.ora
# listener.ora Network Configuration File: /opt/oracle/product/10g/network/admin/listener.ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = gaxt)
      (ORACLE_HOME = /opt/oracle/product/10g)
      (SID_NAME = gaxt)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 外网IP)(PORT = 1521)) 
      (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
    )
  )

3、启动监听

[oracle@localhost ~]$ lsnrctl start

LSNRCTL for Linux: Version 10.2.0.4.0 - Production on 15-DEC-2011 23:27:32

Copyright (c) 1991, 2007, Oracle.  All rights reserved.

Starting /opt/oracle/product/10g/bin/tnslsnr: please wait...

TNSLSNR for Linux: Version 10.2.0.4.0 - Production
System parameter file is /opt/oracle/product/10g/network/admin/listener.ora
Log messages written to /opt/oracle/product/10g/network/log/listener.log
Trace information written to /tmp/listener_trc.trc
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=外网IP)(PORT=1521)))
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=外网IP)(PORT=1521)))
--这里卡了很久很久才显示成功
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 10.2.0.4.0 - Production
Start Date                15-DEC-2011 23:27:32
Uptime                    0 days 0 hr. 3 min. 9 sec
Trace Level               support
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /opt/oracle/product/10g/network/admin/listener.ora
Listener Log File         /opt/oracle/product/10g/network/log/listener.log
Listener Trace File       /tmp/listener_trc.trc
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=外网IP)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
Services Summary...
Service "gaxt" has 1 instance(s).
  Instance "gaxt", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully

4、开启监听trace

--在/opt/oracle/product/10g/network/admin/listener.ora中加入下列参数
TRACE_LEVEL_LISTENER = 16
TRACE_FILE_LISTENER= LISTENER_TRC
TRACE_DIRECTORY_LISTENER=/tmp

6、重启监听查看trace文件

[15-DEC-2011 23:33:32:938] --- TRACE CONFIGURATION INFORMATION FOLLOWS ---
[15-DEC-2011 23:33:32:938] New trace stream is /tmp/listener_trc.trc
[15-DEC-2011 23:33:32:938] New trace level is 16
…………………………
[15-DEC-2011 23:33:32:981] nsnainconn: no native services in use - returning
[15-DEC-2011 23:33:32:981] nsnainconn: signalling that calling function should not continue
[15-DEC-2011 23:33:32:982] nsnainconn: normal exit
[15-DEC-2011 23:33:32:982] nsnaconn: normal exit
[15-DEC-2011 23:33:32:982] nsaccept: exit (0)
[15-DEC-2011 23:36:41:965] nsglma: WARNING - SNMP master agent is not running OR snmp.ora file does not exist.
[15-DEC-2011 23:36:41:965] nsevwait: entry
[15-DEC-2011 23:36:41:965] nsevwait: 3 registered connection(s)
[15-DEC-2011 23:36:41:965] nsevwait: 0 pre-posted event(s)
[15-DEC-2011 23:36:41:965] nsevwait: waiting for transport event (1 thru 4)...
[15-DEC-2011 23:36:41:965] nsevwait: 1 newly-posted event(s)

这里可以看出监听启动的过程中,在这个地方等待了3分钟之久
MOS:Lsnrctl Start is Extremely Slow or Appears to Hang

7、修改hosts文件

[oracle@localhost ~]$ more /etc/hosts
127.0.0.1               localhost.localdomain localhost

8、重启监听查看trace文件

[15-DEC-2011 23:43:44:555] --- TRACE CONFIGURATION INFORMATION FOLLOWS ---
[15-DEC-2011 23:43:44:555] New trace stream is /tmp/listener_trc.trc
……………………
[15-DEC-2011 23:43:44:627] nsevwait: entry
[15-DEC-2011 23:43:44:627] nsevwait: 3 registered connection(s)
[15-DEC-2011 23:43:44:627] nsevwait: 0 pre-posted event(s)
[15-DEC-2011 23:43:44:627] nsevwait: waiting for transport event (1 thru 4)...

这里可以看出监听启动一共使用时间为:几十毫秒

9、结论
在主机名为localhost.localdomain的hosts文件中缺少127.0.0.1 localhost.localdomain,哪怕监听中配置的是ip地址,也将导致监听启动时间非常长。如果主机名不是localhost.localdomain,那hosts中缺少localhost.localdomain没有影响监听启动。

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