[systemd-devel] systemd - nspawn ; systemd-networkd ; containers

[Douglas E. Hopley Jr.]

Greetings -  I hope this finds you well and that I provide a set of good
starting details ...

I have been using systemd-nspawn to create 'containers'/machines that I use
on hosts.  These machines were set up with unique IP addresses so I have
multiple machines on same host (in some cases sharing the host network and
in some cases using a secondary ethernet). ...

Recently I updated one of my hosts to F30 and went to create a new machine.

 The main thrust of this email is that in my process of creating a new
systemd-nspawn machine it seems that `systemd-networkd` is not installed
when I use my steps (I can outline if that will help) to create a machine.
So, in turn I am  not able to set up the machine with unique network
configuration at this point.

 I have running systems with systemd v219 (potentially too old, sorry) and
v229
that have machines (systemd-nspawn containers) networked.

 At this point I was looking to bring up a new sytemd-nspawn
container/machine on a host that has v241. specifically :
==>
systemd 241 (v241-12.git1e19bcd.fc30)
+PAM +AUDIT +SELINUX +IMA -APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP
+GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN2 -IDN
+PCRE2 default-hierarchy=hybrid

 When I follow (my) steps/process for creating a new systemd-nspawn,  I get
this response ==> 'No match for argument: systemd-networkd'.

So,  I have  few starting questions and I can provide more details  as
needed/requested

1)  Has there been, since v219 or v229 a change (that I have yet to uncover
the details) that have moved from systemd-networkd to something
new/different/better?  What is that Or what should I be installing instead
of systemd-networkd?

2) Can you direct me to the details about how to migrate from
'systemd-networkd'?


 3) This is a bit of an open point --- Should I use systemd-nspawn machines
to run resources?  Is there another suggested path I should educate myself
on for having containers (podman? )? I built up my process for bringing up
machines and found that very useful/powerful to have  containers running on
a host that I can have as unique machines (IP addresses, and processes
etc.).  Have I over-used the technology OR is it safe/suggested to use
nspawn in this manner?

Later I will look to create more machines on Centos8 (systemctl --version
==>239).

  Let me know if I can add more details Or  if I need to be more specific.

Thanks in advance for your time.
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