下面透過一個實際的案例討論ONS服務的管理。
在10gR2 RAC環境中，表決磁碟資料丟失，且沒有備份，於是準備清空Clusterware配置資訊，重新執行root.sh指令碼來恢復Clusterware的執行。參考文章：http://space.itpub.net/23135684/viewspace-721081成功執行了/u01/crs/bin/racgons add_config rhel:6251 rhel2:6251命令，之後執行vipca指令碼建立兩個節點的nodeapps（請注意：vipca指令碼會自動建立ons服務，所以之前使用racgons建立ons是沒必要的），但是在建立和啟動過程中發現第二個節點的ons服務無法啟動，檢視第二個節點的ons日誌：
ons日誌的位置是：
/u01/app/oracle/crs/log/rhel2/racg/ora.rhel2.ons.log

格式是： $ORA_CRS_HOME/log//racg/ora..ons.log
跟蹤日誌發現如下資訊：

2012-06-12 17:21:05.030: [ RACG][3999896128] [13230][3999896128][ora.rhel2.ons]: GETHOSTBYNAME(rhel): 2

GETHOSTBYNAME(rhel): 2

Remote port for local node in local config does not match that from OCR.

Number of configuration nodes retrieved: 2

0: {node = rhel, port = 6251}

Adding remote host rhel:6251

1: {node = rhel2, port = 6251}

2012-06-12 17:21:05.032: [ RACG][3999896128] [13230][3999896128][ora.rhel2.ons]: GETHOSTBYNAME(rhel): 2

GETHOSTBYNAME(rhel): 2

Remote port for local node in local config does not match that from OCR.

GETHOSTBYNAME(rhel): 2

Remote port for local node in local config does not match that from OCR.

2012-06-12 17:21:05.032: [ RACG][3999896128] [13230][3999896128][ora.rhel2.ons]: Number of configuration nodes retrieved: 2

0: {node = rhel, port = 6251}

Adding remote host rhel:6251

1: {node = rhel2, port = 6251}

onsctl: ons failed to start

2012-06-12 17:21:05.133: [ RACG][3999896128] [13230][3999896128][ora.rhel2.ons]: clsrcexecut: env ORACLE_CONFIG_HOME=/u01/app/oracle/crs

2012-06-12 17:21:05.133: [ RACG][3999896128] [13230][3999896128][ora.rhel2.ons]: clsrcexecut: cmd = /u01/app/oracle/crs/bin/racgeut -e _USR_ORA_DEBUG=0 540 /u01/app/oracle/crs/bin/onsctl start

2012-06-12 17:21:05.133: [ RACG][3999896128] [13230][3999896128][ora.rhel2.ons]: clsrcexecut: rc = 1, time = 1.650s

2012-06-12 17:21:05.448: [ RACG][3999896128] [13230][3999896128][ora.rhel2.ons]: GETHOSTBYNAME(rhel): 2

GETHOSTBYNAME(rhel): 2

Remote port for local node in local config does not match that from OCR.

Number of configuration nodes retrieved: 2

0: {node = rhel, port = 6251}

Adding remote host rhel:6251

1: {node = rhel2, port = 6251}

2012-06-12 17:21:05.448: [ RACG][3999896128] [13230][3999896128][ora.rhel2.ons]: ons is not running ...

2012-06-12 17:21:05.448: [ RACG][3999896128] [13230][3999896128][ora.rhel2.ons]: clsrcexecut: env ORACLE_CONFIG_HOME=/u01/app/oracle/crs

2012-06-12 17:21:05.448: [ RACG][3999896128] [13230][3999896128][ora.rhel2.ons]: clsrcexecut: cmd = /u01/app/oracle/crs/bin/racgeut -e _USR_ORA_DEBUG=0 540 /u01/app/oracle/crs/bin/onsctl ping

2012-06-12 17:21:05.448: [ RACG][3999896128] [13230][3999896128][ora.rhel2.ons]: clsrcexecut: rc = 1, time = 0.310s

2012-06-12 17:21:05.448: [ RACG][3999896128] [13230][3999896128][ora.rhel2.ons]: end for resource = ora.rhel2.ons, action = start, status = 1, time = 2.060s

2012-06-12 17:21:07.228: [ RACG][740729408] [13260][740729408][ora.rhel2.ons]: onsctl: shutting down ons daemon ...

GETHOSTBYNAME(rhel): 2

Remote port for local node in local config does not match that from OCR.

Number of configuration nodes retrieved: 2

0: {node = rhel, port = 6251}

2012-06-12 17:21:07.228: [ RACG][740729408] [13260][740729408][ora.rhel2.ons]: Adding remote host rhel:6251

1: {node = rhel2, port = 6251}

onsctl: shutdown of ons failed!

2012-06-12 17:21:07.228: [ RACG][740729408] [13260][740729408][ora.rhel2.ons]: clsrcexecut: env ORACLE_CONFIG_HOME=/u01/app/oracle/crs

2012-06-12 17:21:07.228: [ RACG][740729408] [13260][740729408][ora.rhel2.ons]: clsrcexecut: cmd = /u01/app/oracle/crs/bin/racgeut -e _USR_ORA_DEBUG=0 540 /u01/app/oracle/crs/bin/onsctl stop

2012-06-12 17:21:07.228: [ RACG][740729408] [13260][740729408][ora.rhel2.ons]: clsrcexecut: rc = 3, time = 0.470s

從上面的日誌可以看出應該是兩個節點的埠不匹配導致的問題，手動建立ONS服務使用的是6251埠，使用vipca建立的可能不是6251埠，所以導致兩邊的埠不匹配。

一.onsctl工具
下面是onsctl工具的幫助資訊：

[root@rhel1 bin]# ./onsctl

usage: ./onsctl start|stop|ping|reconfig|debug

start - Start opmn only.

stop - Stop ons daemon

ping - Test to see if ons daemon is running

debug - Display debug information for the ons daemon

reconfig - Reload the ons configuration

help - Print a short syntax description (this).

detailed - Print a verbose syntax description.

[root@rhel1 bin]# ./onsctl detailed

usage: ./onsctl start|stop|ping|reconfig|debug

start

Start ons daemon

stop

Shutdown ons daemon

reconfig

Trigger ons to re-read it's configuration files.

ping

Test to see if ons daemon is alive

debug

Display debug information about the ons daemon

help

Print a short syntax description.

detailed

Print a verbose syntax description (this message).

在第一個節點執行onsctl ping命令：

[root@rhel1 bin]# ./onsctl ping

Number of configuration nodes retrieved: 2

0: {node = rhel, port = 6251}

GETHOSTBYNAME(rhel): 2

Adding remote host rhel:6251

GETHOSTBYNAME(rhel): 2

1: {node = rhel2, port = 6251}

Adding remote host rhel2:6251

ons is running ...

ons在第一個節點已經處於執行狀態。

在第二個節點執行onsctl ping命令：

[root@rhel2 bin]# ./onsctl ping

Number of configuration nodes retrieved: 2

0: {node = rhel, port = 6251}

GETHOSTBYNAME(rhel): 2

Adding remote host rhel:6251

GETHOSTBYNAME(rhel): 2

1: {node = rhel2, port = 6251}

Remote port for local node in local config does not match that from OCR.

ons is not running ...

發現第二個節點ons因為埠與第一個節點不匹配的原因而沒有啟動。

二.檢視節點程式：
檢視第一個節點的ons程式：

[root@rhel1 bin]# ps -ef | grep ons

root 2412 1 0 16:47 ? 00:00:00 sendmail: accepting connections

oracle 13513 1 0 17:17 ? 00:00:00 /u01/app/oracle/crs/opmn/bin/ons -d

oracle 13515 13513 0 17:17 ? 00:00:00 /u01/app/oracle/crs/opmn/bin/ons -d

root 15646 3340 0 17:22 pts/0 00:00:00 grep ons

檢視第二個節點的osn程式：

[root@rhel2 bin]# ps -ef | grep ons

root 2400 1 0 16:45 ? 00:00:00 sendmail: accepting connections

root 13847 3546 0 17:22 pts/0 00:00:00 grep ons

三.ONS配置檔案
執行find命令找到了ons的配置檔案，如下：

./opmn/conf/ons.config.tmp

./opmn/conf/ons.config

./opmn/conf/ons.config.backup.10205

[root@rhel1 crs]# cat ./opmn/conf/ons.config

localport=6113

remoteport=6200

loglevel=3

useocr=on

顯然配置檔案中的埠與執行racgons配置的6251不匹配。

四.RACGONS工具
RACGONS的幫助資訊如下：

[root@rhel1 bin]# ./racgons

To add ONS daemons configuration:

./racgons.bin add_config hostname:port [hostname:port] ...

To remove ONS daemons configuration:

./racgons.bin remove_config hostname[:port] [hostname:port] ...

在OCR中可能配置有兩條ONS的資訊，執行以下的命令刪除原有的6251埠配置：

[root@rhel1 bin]# ./racgons remove_config rhel:6251 rhel2:6251

racgons: Existing key value on rhel = 6251.

racgons: rhel:6251 removed from OCR.

racgons: Existing key value on rhel2 = 6251.

racgons: rhel2:6251 removed from OCR.

重新啟動nodeapps：

[root@rhel1 bin]# ./srvctl start nodeapps -n rhel2

[root@rhel1 bin]# ./srvctl start nodeapps -n rhel1

檢視兩個節點的狀態：

[root@rhel1 bin]# ./crs_stat -t

Name Type Target State Host

------------------------------------------------------------

ora.rhel1.gsd application ONLINE ONLINE rhel1

ora.rhel1.ons application ONLINE ONLINE rhel1

ora.rhel1.vip application ONLINE ONLINE rhel1

ora.rhel2.gsd application ONLINE ONLINE rhel2

ora.rhel2.ons application ONLINE ONLINE rhel2

ora.rhel2.vip application ONLINE ONLINE rhel2

恢復正常。

--end--

Oracle 10gR2 RAC Clusterware ONS服務的管理

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