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Best way for a new droplet to programmatically learn its IP address

Posted July 2, 2020 335 views
NetworkingUbuntu 18.04

I am planning to create new droplets dynamically. They will register themselves by writing their IP address in a database. They are all going to be on a private network, so this will be the IP address of eth1 and not eth0. Is the best way for a droplet to learn its IP address to run ifconfig and parse its output, or is there a better way to do this?

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RalphEJohnson
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RalphEJohnson
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linkwithjoydeep July 2, 2020

Hi @RalphEJohnson, I remember needing something like this for a project a while ago, I basically did the following. It gives you the private IP address of the droplet.

ip addr show eth1 | grep "inet\b" | awk '{print $2}' | cut -d/ -f1
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