11gr2 scan重新配置的问题

fiozhang

我的环境是windows下三节点，原来scan是在在host中指定的一个IP
host文件:
192.168.50.50 scan

    d:\>srvctl config scan
   
    SCAN 名称： scan, 网络： 1/192.168.50.0/255.255.255.0/public
   
    SCAN VIP 名称： scan1, IP: /scan/192.168.50.50

现在我想修改scan,在dns服务器上把scan指向3个IP，
请问接下来我要怎么配置scan vip才会变成3个？
host中内容是否要删除还是三个IP都需要写进去？

Maclean Liu(刘相兵

使用 dns的情况下 才能 将一个hostname 解析为三个ip ， 你可以配置dns服务器或者使用 oracle的gdns服务 ， 将该域名的解析ip加入到dns server后，无需再在/etc/hosts 或者windows 的hosts中写入该hostname对应的ip

fiozhang

现在dns解析3个IP这步已经完成接下来是否使用
srvctl modify scan 就会自动把3个 scan vip都加上，包括3个scan_listener服务

Maclean Liu(刘相兵

请直接参考以下文档

        How to Modify SCAN Setting or SCAN Listener Port after Installation :


Click to add to Favorites                How to Modify SCAN Setting or SCAN Listener Port after Installation [ID 972500.1]        To BottomTo Bottom       
Modified:Mar 19, 2012Type:HOWTOStatus:PUBLISHEDPriority:2       
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In this Document
  Goal
  Solution
     A. To update SCAN setting
     B. To modify SCAN listener port
  References

Applies to:
Oracle Server - Enterprise Edition - Version: 11.2.0.1 and later   [Release: 11.2 and later ]
Information in this document applies to any platform.
Goal
This note provides steps to update 11gR2 Grid Infrastructure (CRS) Single Client Access Name (SCAN) setting or SCAN listener port setting if it's not setup properly or if it's changed after setup.

Note:

1. This procedure does not apply when GNS is being used
2. Even though clustername and SCAN name is set to the same during 'typical' installation, changing SCAN name will not affect clustername as change of clustername requires deconfigure and reconfigure of the entire cluster.

Solution

A. To update SCAN setting
1. As per documentation "Oracle Grid Infrastructure Installation Guide", Oracle strongly recommend to configure SCAN name in either DNS or GNS as /etc/hosts file can only resolve to one IP address.

SCAN IP must be in same subnet as public and VIP. If the new SCAN IP will be in different subnet, refer to note 276434.1 to change nodeapps/network resource first.

1a. If you intend to use /etc/hosts for SCAN name resolution, the same and only entry for SCAN name must exist on all nodes.

1b. If you intend to use DNS for SCAN name resolution, remove entries for SCAN name from /etc/hosts on all nodes, and make sure nslookup returns good result on all nodes, for example:

$ nslookup pay-scan.us.oracle.com
..
Name:   pay-scan.us.oracle.com
Address: 10.4.0.201
Name:   pay-scan.us.oracle.com
Address: 10.4.0.202
Name:   pay-scan.us.oracle.com
Address: 10.4.0.203


2. Once #1a or #1b is configured properly, execute the following to modify:
If name resolution for SCAN is being switched from local hosts file to DNS, be sure to remove SCAN name in local hosts file on all nodes prior to execute below commands.

2.1. To modify SCAN name or SCAN VIP addresses:

2.1.1. As grid user stop resources:
$ $GRID_HOME/bin/srvctl stop scan_listener
$ $GRID_HOME/bin/srvctl stop scan

2.1.2. As root user modify SCAN:
# $GRID_HOME/bin/srvctl modify scan -n pay-scan.us.oracle.com

### For 11.2.0.1 only, if you intend to change SCAN name, due to bug 9603829, execute the following:

# $GRID_HOME/bin/crsctl modify type ora.scan_vip.type -attr "ATTRIBUTE=SCAN_NAME,DEFAULT_VALUE=<new SCAN name>"

### Example:
# $GRID_HOME/bin/crsctl modify type ora.scan_vip.type -attr "ATTRIBUTE=SCAN_NAME,DEFAULT_VALUE=pay-scan.us.oracle.com"

Once SCAN name is changed, update database init.ora/spfile parameter remote_listener to the new one.

2.1.3. As grid user modify and start resources:
$ $GRID_HOME/bin/srvctl modify scan_listener -u
$ $GRID_HOME/bin/srvctl start scan_listener

2.1.4. To confirm the change
$ $GRID_HOME/bin/srvctl config scan
SCAN name: pay-scan.us.oracle.com, Network: 1/10.4.0.0/255.255.255.0/eth1
SCAN VIP name: scan1, IP: /10.4.0.201/120.0.0.201
SCAN VIP name: scan2, IP: /10.4.0.202/120.0.0.202
SCAN VIP name: scan3, IP: /10.4.0.203/120.0.0.203

$ $GRID_HOME/bin/srvctl config scan_listener
SCAN Listener LISTENER_SCAN1 exists. Port: TCP:1521
SCAN Listener LISTENER_SCAN2 exists. Port: TCP:1521
SCAN Listener LISTENER_SCAN3 exists. Port: TCP:1521


2.2. To change SCAN to be on second network:

By default, SCAN will be configured on first public network (ora.net1.network), however in multiple public network environment, SCAN can run on second or other network.

There's no option to modify SCAN to use non-first network, to change to second or other network, scan_listener and scan resources need to be removed and added back.

In this example, we'll move SCAN from net1 to net2

$ $GRID_HOME/bin/srvctl config network
Network exists: 1/10.1.0.0/255.255.255.128/eth3, type static
Network exists: 2/10.1.1.0/255.255.255.128/eth4, type static

2.2.1. As grid user stop resources and remove scan_listener:
$ $GRID_HOME/bin/srvctl stop scan_listener
$ $GRID_HOME/bin/srvctl stop scan
$ $GRID_HOME/bin/srvctl remove scan_listener -f

2.2.2. As root user remove and add SCAN:
# $GRID_HOME/bin/srvctl remove scan -f
# $GRID_HOME/bin/srvctl add scan -n <scan-name> -k 2

Once SCAN name is changed, update database init.ora/spfile parameter remote_listener to the new one.

2.2.3. As grid user add scan_listener and start resources:
$ $GRID_HOME/bin/srvctl add scan_listener -p <port>
$ $GRID_HOME/bin/srvctl start scan_listener


B. To modify SCAN listener port
As grid user:

1. Modify SCAN listener port:

$GRID_HOME/bin/srvctl modify scan_listener -p <new-SCAN-port>


2. Restart SCAN listener so the new port will be effective:

$GRID_HOME/bin/srvctl stop scan_listener
$GRID_HOME/bin/srvctl start scan_listener


3. Confirm the change:

$GRID_HOME/bin/srvctl config scan_listener