Virtual IP Configuration for PostgreSQL (OEL8)

 1-) Check network interface name with the command below:


2-) Go to network interface file location and copy & rename interface config file:


ifcfg -a 

cd /etc/sysconfig/network-scripts

cp ifcfg-ens192 ifcfg-ens192:1


3-) Edit newly copied file, change the parameters below:


IPADDR= (new ip address) 

DEVICE=ens192:1

NAME=ens192:1 


4-)  Edit postgresql.conf for new listen address:


vi /<postgresqlfolder>/14/data/postgresql.conf

listen_address='(new ip address)'


5-) Edit postgresql service file and add the parameters below at [Unit] section:


 vi /usr/lib/systemd/system/postgresql-14.service


Wants=network-online.target

After=network-online.target


6-) Reboot the server if possible. Otherwise, reload all services. Since you need to be sure everything will work after a planned/unplanned reboot, restarting the server is guaranteed way. After the process, check if service working and virtual ip is up and running. 

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