How to Modify Public Network Information including VIP in Oracle Clusterware

How to Modify Public Network Information including VIP in Oracle Clusterware 

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In this Document

 Purpose 

 Scope 

 Details 

  Case I.   Changing public hostname 

  Case II.  Changing public IP only without changing interface, subnet or 

netmask 

  Case III. Changing public network interface, subnet or netmask 

  Case IV. Changing VIPs associated with public network change 

  Planning for VIP changes 

  Gathering Current VIP Configuration 

  Stopping Resources 

  Modifying VIP and Its Associated Attributes 

  Restarting Resources 

  Others 

  Case V. Change SCAN VIP associated with public network change 

 References 

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Applies to: 

 Oracle Database - Enterprise Edition - Version 10.1.0.2 to 12.1.0.2 [Release 

10.1 to 12.1]

Information in this document applies to any platform.

Purpose

The purpose of this note is to illustrate how to change a public hostname, 

public IP, a Virtual IP Address (VIP), VIP hostname or other VIP attributes 

in an Oracle Clusterware/Grid Infrastructure environment.

Scope

Oracle Database 10g and 11g use VIPs (Virtual IP) in clustered environments 

for clients to connect to the database. These VIPs are static IP addresses 

associated with (virtual) hostnames and resolved through DNS (except when 

using 11gR2 GNS).

 During the installation of the Oracle Clusterware users are prompted to 

enter a Virtual IP and Virtual hostname for each of the node in the cluster. 

These are stored within the OCR (Oracle Cluster Registry) and different 

components within the HA framework depend on these VIPs. If for some reason 

the need arises to change either the VIP, the VIP hostname, or the subnet, 

netmask etc, this procedure should be followed.

For changes associated with private network/cluster interconnect, please 

refer to Note 283684.1

Details

Case I.   Changing public hostname

Public hostname is recorded in OCR, it is entered during installation phase. 

It can not be modified after the installation. The only way to modify public 

hostname is by deleting the node, then add the node back with a new hostname, 

or reinstall the clusterware.

 

Case II.  Changing public IP only without changing interface, subnet or 

netmask

If the change is only public IP address and the new ones are still in the 

same subnet, nothing needs to be done on clusterware layer, all changes need 

to be done at OS layer to reflect the change.

1. Shutdown Oracle Clusterware stack 

 2. Modify the IP address at network layer, DNS and /etc/hosts file to 

reflect the change

 3. Restart Oracle Clusterware stack

Above change can be done in rolling fashion, eg: one node at a time.

 

Case III. Changing public network interface, subnet or netmask

If the change involves different subnet(netmask) or interface, delete the 

existing interface information from OCR and add it back with the correct 

information is required.  In the example here, the subnet is changed from 

10.2.156.0  to 10.2.166.0 via two separate commands - first a 'delif'  

followed by a 'setif':

% $CRS_HOME/bin/oifcfg/oifcfg delif -global <if_name>[/<subnet>]

 % $CRS_HOME/bin/oifcfg/oifcfg setif -global <if_name>/<subnet>:public

 For example:

 % $CRS_HOME/bin/oifcfg delif -global eth0/10.2.156.0 

 % $CRS_HOME/bin/oifcfg setif -global eth0/10.2.166.0:public

Then make the change at OS layer. There is no requirement to restart Oracle 

clusterware unless OS change requires a node reboot. This can be done in 

rolling fashion.

Once public network is changed, its associated VIP and SCAN VIP are also 

required to change, refer to CASE IV and CASE V.

Note: for 11gR2, above command requires clusterware RUNNING on ALL nodes, 

otherwise PRIF-33 and PRIF-32 will be reported, i.e.

 [grid@racnode1 bin]$ ./oifcfg delif -global eth0/192.168.1.0

PRIF-33: Failed to set or delete interface because hosts could not be 

discovered

  CRS-02307: No GPnP services on requested remote hosts.

PRIF-32: Error in checking for profile availability for host racnode2

  CRS-02306: GPnP service on host "racnode2" not found.

 

Case IV. Changing VIPs associated with public network change

Planning for VIP changes

In general, a complete outage is only required for pre-10.2.0.3 release. From 

10.2.0.3 onwards, the ASM/database instance dependency on the VIP resource is 

removed, so the VIP could be modified without having to take down the 

ASM/database instance, only client connections to the database will be 

affected when VIP is down. If the modification is a node specific, then only 

connection to that node will be affected during the time of change.

Please follow Case III to ensure public network changes are made first. If 

there is a node reboot or Clusterware restart after the OS network change, 

vip will not start, please skip to step "Modifying VIP and its Associated 

Attributes".

Gathering Current VIP Configuration

1. Gather the existing setup

 for 10g and 11gR1, as Oracle Clusterware owner:

$ srvctl config nodeapps -n <node> -a

 eg:

 $ srvctl config nodeapps -n racnode1 -a

 VIP exists.: /racnode1-vip/101.17.80.184/255.255.254.0/eth1

 for 11gR2, as Grid Infrastructure owner:

$ srvctl config nodeapps -a

 eg:

 $ srvctl config nodeapps -a

 Network exists: 1/101.17.80.0/255.255.254.0/eth1, type static

 VIP exists: /racnode1-vip/101.17.80.184/101.17.80.0/255.255.254.0/eth1, 

hosting node racnode1

 VIP exists: /racnode2-vip/101.17.80.186/101.17.80.0/255.255.254.0/eth1, 

hosting node racnode2

 2. Verify VIP status

10.2 and 11.1:

 $ crs_stat -t 

 11.2:

 $ crsctl stat res -t

 - it should show VIPs are ONLINE

 $ ifconfig -a

 (netstat -in for HP and ipconfig /all for Windows)

 - VIP logical interface is bound to the public network interface

 

Stopping Resources

3. Stop the nodeapps resources (and all dependent resources ASM/DB only if 

required):

 10g and 11gR1, as Oracle Clusterware owner:

$ srvctl stop instance -d <db_name> -i <inst_name>   (optional for 10.2.0.3+)

 $ srvctl stop asm -n <node_name>                     (optional for 

10.2.0.3+)

 $ srvctl stop nodeapps -n <node_name>

 eg, 

 $ srvctl stop instance -d RACDB -i RACDB1

 $ srvctl stop asm -n racnode1

 $ srvctl stop nodeapps -n racnode1

 11gR2, as Grid Infrastructure owner:

$ srvctl stop instance -d <db_name> -n <node_name>    (optional)

 $ srvctl stop vip -n <node_name> -f

 eg, 

 $ srvctl stop instance -d RACDB -n racnode1

 $ srvctl stop vip -n racnode1 -f

 

Note 1: The -f option is required for 11gR2 to stop listener resource, 

otherwise following error will occur:

 PRCR-1014 : Failed to stop resource ora.racnode1.vip

 PRCR-1065 : Failed to stop resource ora.racnode1.vip

 CRS-2529: Unable to act on 'ora.racnode1.vip' because that would require 

stopping or relocating 'ora.LISTENER.lsnr', but the force option was not 

specified

 ...

 4. Verify VIP is now OFFLINE and the interface is no longer bound to the 

public network interface

$ crs_stat -t (or $ crsctl stat res -t for 11gR2)

 $ ifconfig -a

 (netstat -in for HP and ipconfig /all for windows)

 

Modifying VIP and Its Associated Attributes

5. Determine the new VIP IP/subnet/netmask or VIP hostname, make the network 

change on OS first, ensure the new VIP is registered in DNS or modified in 

/etc/hosts (for Unix/Linux) and \WINDOWS\System32\drivers\etc\hosts file (for 

Windows). If the network interface is changed, ensure the new interface is 

available on the server before proceeding with the modification.

For example:

 New VIP is: 110.11.70.11 racnode1-nvip

 new subnet is 110.11.70.0

 new netmask is 255.255.255.0

 new interface is eth2

 6. Modify the VIP resource, as root user:

# srvctl modify nodeapps -n <node> -A <new_vip_address or 

new_vip_hostname>/<netmask>/<[if1[if2...]]>

 eg:

 # srvctl modify nodeapps -n racnode1 -A racnode1-nvip/255.255.255.0/eth2

 

Note 1: Starting with 11.2, the VIPs depend on the network resource 

(ora.net1.network), the OCR only records the VIP hostname or the IP address 

associated with the VIP resource. The network attributes 

(subnet/netmask/interface) are recorded with the network resource. When the 

nodeapps resource is modified, the network resoure(ora.net1.network) 

attributes are also modified implicitly.

 From 11.2.0.2 onwards, if only subnet/netmask/interface change is required, 

network resource can be modified directly via srvctl modify network command.

 as root user:

 # srvctl modify network -k <network_number>] [-S <subnet>/<netmask>[/if1[|

if2...]]

 eg:

 # srvctl modify network -k 1 -S 110.11.70.0/255.255.255.0/eth2

 There is no need to modify VIP or SCAN if other attributes are not changed.

Note 2: For 12.1.0.1 release, due to unpublished Bug 16608577 - CANNOT ADD 

SECOND PUBLIC INTERFACE IN ORACLE 12.1, the srvctl modify network command 

fails with:

# srvctl modify network -k 1 -S 110.11.70.0/255.255.255.0/eth2

PRCT-1305 : The specified interface name "eth2" does not match the existing 

network interface name "eth1"

Workaround is to modify network resource with an empty interface name, then 

modify it again with the desired interface name, eg:

 # srvctl modify network -k 1 -S 110.11.70.0/255.255.255.0

# srvctl modify network -k 1 -S 110.11.70.0/255.255.255.0/eth2

The bug has been fixed in 12.1.0.2 and above.

* A special case for 11gR2 modifying the VIP hostname only without changing 

the IP address.

For example: only VIP hostname changes from racnode1-vip to racnode1-nvip, IP 

and other attributes remain the same.

 If IP address is not changed, above modify command will not change the 

USR_ORA_VIP value in 'crsctl stat res ora.racnode1.vip -p' output. Please use 

the following command:

# crsctl modify res ora.racnode1.vip -attr USR_ORA_VIP=racnode1-nvip

Verify the changes for USR_ORA_VIP field:

 # crsctl stat res ora.racnode1.vip -p |grep USR_ORA_VIP

 

Note: For Windows platform, the interface name needs to be in quote (") if 

there is a space in between, eg:

 As administrator user or software install user:

 > srvctl modify nodeapps -n racnode1 -A 110.11.70.11/255.255.255.0/"Local 

Area Connection 1"

 

 7. Verify the change

$ srvctl config nodeapps -n <node> -a (10g and 11gR1)

 $ srvctl config nodeapps -a (11gR2)

 eg:

 $ srvctl config nodeapps -n racnode1 -a

 VIP exists.: /racnode1-nvip/110.11.70.11/255.255.255.0/eth2

 

Restarting Resources

8. Start the nodeapps and the other resources

 10g and 11gR1, as Oracle Clusterware owner:

$ srvctl start nodeapps -n <node_name>       

 $ srvctl start asm -n <node_name>               (optional for 10.2.0.3+)

 $ srvctl start instance -d <dbanme> -i <inst>   (optional for 10.2.0.3+)

 eg:

 $ srvctl start nodeapps -n racnode1

 $ srvctl start asm -n racnode1

 $ srvctl start instance -d RACDB -i RACDB1

11gR2, as Grid Infrastructure owner:

$ srvctl start vip -n <node_name> 

$ srvctl start listener -n <node_name>

 $ srvctl start instance -d <db_name> -n <node_name>      (optional)

 eg,

 $ srvctl start vip -n racnode1 

$ srvctl start listener -n racnode1

 $ srvctl start instance -d RACDB -n racnode1

Note: if the network attributes are changed, i.e. netmask changed, restart 

the nodeapps

 9. Verify the new VIP is ONLINE and bind to the public network interface

$ crs_stat -t (or $ crsctl stat res -t for 11gR2)

 $ ifconfig -a

 (netstat -in for HP or ipconfig /all for windows)

 10. Repeat the same steps for the rest nodes in the cluster only if the 

similar change is required.

Others

11. Modify listener.ora,  tnsnames.ora and LOCAL_LISTENER/REMOTE_LISTENER 

parameter to reflect the VIP change if necessary.