After creating 2 droplets(CentOS 7), and booting the system, I powered them down, added private network to them, which DO portal showed its addresses correctly.
But ifconfig command for eth1 did not have any of that IP address, just showing the IPv6 address.
I added the private IP address with ifconfig to eth1, which provided private IP to the instance(droplet), but since there is no file under /etc/sysconfig/network-scripts/ for ifcfg-eth1, most probably every time I reboot the instance, I have to re-assign the private IP to the instance. which can be counter-productive.
Could you please let me know which step I am missing here. Thanks.