【RAC】如何修改SCAN IP的IP地址、名称、端口等信息

How to Update the IP Address of the SCAN VIP Resources (ora.scan{n}.vip) (文档 ID 952903.1)

In this Document

APPLIES TO:

Oracle Database - Enterprise Edition - Version 11.2.0.1 and later
Information in this document applies to any platform.

GOAL

The purpose of this document is to explain how to change the IP addresses associated with the SCAN VIPs in a 11gR2 Grid (CRS) environment.

The IP addresses associated with the SCAN VIP resources are initially set when the SCAN resources are created. 
Any changes to the DNS entry for the SCAN are not automatically propagated to the clusterware and need to be done manually.

This applies only to installations that are not using GNS.

The information in this note can also be helpful in cases where SCAN was originally configured with just one address and is now being expanded to accommodate three IP addresses.

SOLUTION

1. Before the SCAN VIPs can be changed, the entry for the SCAN name on the Domain Name Server (DNS) needs to be updated with the new IP addresses. This usually will be done by a network administrator. To check the current setting, the following command can be used:
   nslookup <scan_name>
2. To check the current IP address(es) of the SCAN VIPs, run the following commands as the root user:
   $GRID_HOME/bin/srvctl config scan
3. Stop the SCAN listeners and SCAN
   $GRID_HOME/bin/srvctl stop scan_listener 
   $GRID_HOME/bin/srvctl stop scan
4. Next refresh the SCAN VIPs with the new IP addresses from the DNS entry:
   $GRID_HOME/bin/srvctl modify scan -n <scan_name
5. To check if the SCAN VIPs have been changed, run the following command, it should now show the new IP addresses.
   $GRID_HOME/bin/srvctl config scan
6. Restart SCAN & SCAN listener:
   $GRID_HOME/bin/srvctl start scan 
   $GRID_HOME/bin/srvctl start scan_listener
7. If the number of SCAN VIPs has changed, the SCAN listener needs to be updated:
   $GRID_HOME/bin/srvctl modify scan_listener -u

A lookup of the SCAN on the DNS server shows that the entry has already been updated with the new IP addresses:

Stop the SCAN listener and the SCAN VIP resources:

The SCAN VIP resources still show the old IP addresses:

Now tell CRS to update the SCAN VIP resources:

To verify that the change was successful, check the SCAN configuration again:

Start SCAN and the SCAN listener:

How to Modify SCAN Setting or SCAN Listener Port after Installation (文档 ID 972500.1)

In this Document

APPLIES TO:

Oracle Database - Enterprise Edition - Version 11.2.0.1 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:

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:

2.1.2. As root user modify SCAN:

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:

2.1.4. To confirm the change

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

2.2.1. As grid user stop resources and remove scan_listener:

2.2.2. As root user remove and add SCAN:

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:

B. To modify SCAN listener port

As grid user:

1. Modify SCAN listener port:

Update 11gR2 database init.ora parameter: alter system set remote_listener='<SCAN-name>:<new-port-number>' scope=both;

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

3. Confirm the change:

REFERENCES

NOTE:975457.1 - How to Troubleshoot Connectivity Issue with 11gR2 SCAN Name
NOTE:276434.1 - How to Modify Public Network Information including VIP in Oracle Clusterware
NOTE:887471.1 - PRVF-4664 PRVF-4657: Found inconsistent name resolution entries for SCAN name
NOTE:887522.1 - Grid Infrastructure Single Client Access Name (SCAN) Explained

NOTE:359277.1 - Changing Default Listener Port Number

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