netdev - How to set domainname with iproute2? (net-tools deprecation)

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Message-ID: <CAPwpnyTDpkX2hxiqYLxTuMM38cq+whPSC0yoee-YPLEAwfvqpQ@mail.gmail.com>
Date:   Fri, 13 Mar 2020 09:21:52 -0700
From:   Chuck <chuck@...elligence.org>
To:     netdev@...r.kernel.org
Subject: How to set domainname with iproute2? (net-tools deprecation)

I see calls to move the world from net-tools to iproute2 [1] [2] [3].

My Linux distro uses the `hostname` executable from net-tools to set the
hostname, which simply passes it through to the `sethostname` system call.
I don't see any references to `sethostname` in the iproute2 sources.  I
guess the replacement is systemd's `hostnamectl set-hostname`?

My distro uses the `domainname` executable (which is a symlink to
`hostname`) from net-tools to set the domain name, which simply passes it
through to the `setdomainname` system call.  I don't see any calls
to `sethostname` in either iproute2 or systemd.

What is the recommended way to set the domain name during system
start-up without net-tools?

(Asking here because iproute2 is supposed to replace net-tools.  If this is
not the right list for this, 1. Apologies, and 2. Where is the right place
for this inquiry?)

[1] https://lwn.net/Articles/710533/
[2] https://lwn.net/Articles/710535/
[3] https://wiki.linuxfoundation.org/networking/iproute2