Change SCAN Listener from etc/host to DNS

Changing SCAN LISTENER from etc/hosts on Linux to use DNS which mean the from one IP to 3 IPs

The SCAN listener will remain the same without any change therefore like i mentioned before the these steps only provide changing for SCAN to use DNS.

“I Will not post any output”

the configuration for the IP should be added to DNS and to check this on OS level you should nslookup command :-

On node #1 run the below command to check the Listener status and see the current configuration:-

srvctl status scan
srvctl status scan_listener
srvctl config scan
srvctl config scan_listener

On node #2 run the below command to check the Listener status and see the current configuration:-

srvctl status scan
srvctl status scan_listener
srvctl config scan
srvctl config scan_listener

The output should be the same for both.

Stop all the listeners on your RAC as root :-

srvctl stop scan_listener
srvctl stop scan
srvctl status scan
srvctl status scan_listener

Remove or comment any entire in /etc/hosts after done stop the listener.

Let’s modify the scan :-

srvctl modify scan -n
srvctl modify scan_listener –u

Start listener :-

srvctl start scan
srvctl start scan_listener
srvctl status scan
srvctl status scan_listener

Thanks
Osama