How can make service run after eth0 ready

i have application which need eth0 ready, and how can I make the application run after eth0 ready?

I don’t think there is a way to wait on a particular interface. However, system daemons packaged as snaps will have as a prerequisite. If eth0 is the primary network adapter for your device/system, then this should ensure it starts after the interface is ready.

Alternatively, if you use socket activation your daemon will be started on the first attempt by a client to connect to it. Unless this is a connection from localhost, this should also indicate that the external network interface is up.

If you are writing an app rather than a daemon, then you don’t have this control: your app will be run whenever the user invokes it.

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