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如何修改SCAN VIP和SCAN Listener Port

原文链接:http://www.ohsdba.cn/index.php?m=Article&a=show&id=190

从11gR2 GI(Grid Infrastructure)引入了一个新功能叫SCAN(Single Client Access Name),SCAN是一个域名,可以解析至少1个IP,最多解析3个SCAN IP,客户端可以通过这个SCAN 名字来访问数据库,SCAN的好处就是当集群中新增加了节点或者删除了节点,不需要额外维护客户端。在11gR2上,客户端仍然可以继续使用原有的VIP,但推荐使用SCAN。和SCAN相关的有SCAN IP和SCAN Listener,SCAN IP和SCAN Listener是成对出现的,如果有3个SCAN IP,同时也会有3个SCAN Listener。SCAN IP就是DNS解析的IP地址,SCAN Listener的作用是接受客户端的连接请求。

整个过程如下:
A.客户端发出连接数据库的请求,DNS将SCAN解析出对应的3个SCAN IP并返回给客户端
B.客户端随机的选择其中一个SCAN IP地址,然后通过这个SCAN IP访问对应的节点,当对应节点的SCAN Listener接受到请求后,SCAN Listener会选择压力最小的数据库实例
C.压力最小的数据库实例将对应的Local Listener的地址返回给客户端,最终是这个Local Listener为客户端请求建立与数据库的连接

注意:SCAN IP也是VIP,在SCAN服务启动之前,这个地址是不通的。

有时候我们可能会遇到这种情况,客户系统升级/迁移,想保持原来的IP不变,因为对客户来说修改客户端和其他配置信息可能会更麻烦。SCAN Listener和其他监听一样,可以有自己的端口。

注意:下面的例子不适合使用GNS的情况,只包括使用hosts文件或DNS。

首先备份OCR

[root@hadb1 ~]# /phadb/orgrid/oracle/product/112/bin/ocrconfig -export /phadb/ocr.bak
[root@hadb1 ~]# ls -l /phadb/ocr.bak
-rw------- 1 root root 132140 Nov 11 17:21 /phadb/ocr.bak
[root@hadb1 ~]# file /phadb/ocr.bak
/phadb/ocr.bak: data
[root@hadb1 ~]#

查看SCAN配置

[orgrid@hadb1 ~]$ srvctl config scan
SCAN name: yshis-scan, Network: 1/192.168.16.0/255.255.255.0/eth0
SCAN VIP name: scan1, IP: /yshis-scan/192.168.16.9

[orgrid@hadb1 ~]$ srvctl config scan_listener
SCAN Listener LISTENER_SCAN1 exists. Port: TCP:1521

停止SCAN和SCAN Listener

[orgrid@hadb1 ~]$ srvctl stop scan_listener
[orgrid@hadb1 ~]$ srvctl stop scan

查看SCAN状态

[orgrid@hadb1 ~]$ srvctl status scan
SCAN VIP scan1 is enabled
SCAN VIP scan1 is not running
[orgrid@hadb1 ~]$ srvctl status scan_listener
SCAN Listener LISTENER_SCAN1 is enabled
SCAN listener LISTENER_SCAN1 is not running

在/etc/hosts,或DNS中修改ip地址信息

修改SCAN

[root@hadb1 ~]# /phadb/orgrid/oracle/product/112/bin/srvctl modify scan -n yshis-scan

修改SCAN监听端口(可选步骤,如果需要)

[root@hadb1 ~]# /phadb/orgrid/oracle/product/112/bin/srvctl modify scan_listener -p 10010

查看SCAN信息

[root@hadb1 ~]# /phadb/orgrid/oracle/product/112/bin/srvctl config scan
SCAN name: yshis-scan, Network: 1/192.168.16.0/255.255.255.0/eth0
SCAN VIP name: scan1, IP: /yshis-scan/192.168.16.3
[orgrid@hadb1 ~]$ srvctl config scan_listener
SCAN Listener LISTENER_SCAN1 exists. Port: TCP:10010

注意:以上步骤会自动更新remote_listener信息,如果没有更新,可通过下面手动步骤更新

alter system set remote_listener='<SCAN-name>:<new-port-number>’ scope=both;

启动SCAN

[root@hadb1 ~]# /phadb/orgrid/oracle/product/112/bin/srvctl start scan
[root@hadb1 ~]# /phadb/orgrid/oracle/product/112/bin/srvctl start scan_listener

查看SCAN状态

[root@hadb1 ~]# /phadb/orgrid/oracle/product/112/bin/srvctl status scan
SCAN VIP scan1 is enabled
SCAN VIP scan1 is running on node hadb2

[root@hadb1 ~]# /phadb/orgrid/oracle/product/112/bin/srvctl config scan
SCAN name: yshis-scan, Network: 1/192.168.16.0/255.255.255.0/eth0
SCAN VIP name: scan1, IP: /yshis-scan/192.168.16.3
[root@hadb1 ~]#

如果SCAN VIP的数量改变了, 需要更新scan_listener(srvctl modify scan_listener -u)

查看监听信息

[orgrid@hadb1 ~]$ ps -ef|grep tns
root       165     2  0 10:56 ?        00:00:00 [netns]
orgrid    2758     1  0 17:26 ?        00:00:00 /phadb/orgrid/oracle/product/112/bin/tnslsnr LISTENER -inherit
orgrid    8470  8367  0 17:36 pts/2    00:00:00 grep tns
[orgrid@hadb1 ~]$ srvctl start database -d phadb
[orgrid@hadb1 ~]$

[root@hadb2 ~]# ps -ef|grep tns
root       165     2  0 10:55 ?        00:00:00 [netns]
orgrid   16513     1  0 17:26 ?        00:00:00 /phadb/orgrid/oracle/product/112/bin/tnslsnr LISTENER -inherit
orgrid   18412     1  0 17:34 ?        00:00:00 /phadb/orgrid/oracle/product/112/bin/tnslsnr LISTENER_SCAN1 -inherit
root     18755 13797  0 17:36 pts/2    00:00:00 grep tns
[root@hadb2 ~]# su - orgrid
[orgrid@hadb2 ~]$ lsnrctl status LISTENER_SCAN1
LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 11-NOV-2016 17:36:39
Copyright (c) 1991, 2013, Oracle.  All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN1)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER_SCAN1
Version                   TNSLSNR for Linux: Version 11.2.0.4.0 - Production
Start Date                11-NOV-2016 17:34:31
Uptime                    0 days 0 hr. 2 min. 8 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /phadb/orgrid/oracle/product/112/network/admin/listener.ora
Listener Log File         /phadb/orgrid/oracle/product/112/log/diag/tnslsnr/hadb2/listener_scan1/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN1)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.16.3)(PORT=10010)))
The listener supports no services
The command completed successfully
[orgrid@hadb2 ~]$

查看集群状态

 

[orgrid@hadb1 ~]$ crsctl stat res -t
--------------------------------------------------------------------------------
NAME           TARGET  STATE        SERVER                   STATE_DETAILS
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.DATA_HIS.dg
               ONLINE  ONLINE       hadb1
               ONLINE  ONLINE       hadb2
ora.FRA_HIS.dg
               ONLINE  ONLINE       hadb1
               ONLINE  ONLINE       hadb2
ora.LISTENER.lsnr
               ONLINE  ONLINE       hadb1
               ONLINE  ONLINE       hadb2
ora.SYSTEMDG.dg
               ONLINE  ONLINE       hadb1
               ONLINE  ONLINE       hadb2
ora.asm
               ONLINE  ONLINE       hadb1                 Started
               ONLINE  ONLINE       hadb2                 Started
ora.gsd
               OFFLINE OFFLINE      hadb1
               OFFLINE OFFLINE      hadb2
ora.net1.network
               ONLINE  ONLINE       hadb1
               ONLINE  ONLINE       hadb2
ora.ons
               ONLINE  ONLINE       hadb1
               ONLINE  ONLINE       hadb2
ora.registry.acfs
               ONLINE  ONLINE       hadb1
               ONLINE  ONLINE       hadb2
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.LISTENER_SCAN1.lsnr
      1        ONLINE  ONLINE       hadb2
ora.cvu
      1        ONLINE  ONLINE       hadb1
ora.oc4j
      1        ONLINE  ONLINE       hadb1
ora.phadb.db
      1        ONLINE  ONLINE       hadb1                 Open
      2        ONLINE  ONLINE       hadb2                 Open
ora.phadb.orcl.svc
      1        ONLINE  ONLINE       hadb1
      2        ONLINE  ONLINE       hadb2
ora.scan1.vip
      1        ONLINE  ONLINE       hadb2
ora.hadb1.vip
      1        ONLINE  ONLINE       hadb1
ora.hadb2.vip
      1        ONLINE  ONLINE       hadb2
[orgrid@hadb1 ~]$

 

Reference

http://docs.oracle.com/database/121/JJDBC/scan.htm#JJDBC29151

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