This tutorial explains how to change the SCAN (Single Client Access Name) IP addresses in an Oracle RAC 19c cluster.
Applies to:
- Oracle Grid Infrastructure 19c
- Oracle RAC 19c
- Linux platforms
- Static SCAN IP configuration (DNS or GNS)
The SCAN consists of:
- SCAN Name (for example: rac19c-scan.wadhahdaouehi.tn)
- SCAN VIPs (usually 3 recommended addresses)
- SCAN Listeners
Example:
| Component | Old Value | New Value |
|---|---|---|
| SCAN Name | rac19c-scan | rac19c-scan |
| SCAN VIP 1 | 192.168.10.51 | 192.168.20.51 |
| SCAN VIP 2 | 192.168.10.52 | 192.168.20.52 |
| SCAN VIP 3 | 192.168.10.53 | 192.168.20.53 |
Check Cluster Status:
[root@rac19c-node01 ~]# srvctl config scan
SCAN name: rac19-scan, Network: 1
Subnet IPv4: 192.168.10.0/255.255.255.0/pubnet, static
Subnet IPv6:
SCAN 1 IPv4 VIP: 192.168.10.51
SCAN VIP is enabled.
SCAN 2 IPv4 VIP: 192.168.10.52
SCAN VIP is enabled.
SCAN 3 IPv4 VIP: 192.168.10.53
SCAN VIP is enabled.
Update DNS or in hosts file
In my example, i am using the hosts configuration file, so you shoul update this configuration with new IP adresses
192.168.20.51 rac19-scan
192.168.20.52 rac19-scan
192.168.20.53 rac19-scan
Update the SCAN configuration:
[root@rac19c-node01 ~]# srvctl modify scan -scanname rac19-scan
Now, lets check again:
[root@rac19c-node01 ~]# srvctl config scan
SCAN name: rac19-scan, Network: 1
Subnet IPv4: 192.168.20.0/255.255.255.0/pubnet, static
Subnet IPv6:
SCAN 1 IPv4 VIP: 192.168.20.51
SCAN VIP is enabled.
SCAN 2 IPv4 VIP: 192.168.20.52
SCAN VIP is enabled.
SCAN 3 IPv4 VIP: 192.168.20.53
SCAN VIP is enabled.
[root@rac19c-node01 ~]#
Next step:
Re update the parameter remote_listener:
SQL> ALTER SYSTEM SET remote_listener='rac19-scan:1521' SCOPE=BOTH sid='*';
Last step: Delete the old configiration:
[root@rac19c-node01 ~]# oifcfg delif -global pubnet/192.168.10.0
[root@rac19c-node01 ~]# oifcfg setif -global pubnet/192.168.20.0:public
Google+
Facebook
