Hello,

I am trying to see how to implement with systemd-nspawn a version of
docker's pod when a group of very lightweight containers use a
loopback interface or unix sockets to communicate with each other and
a shared network interface to communicate with the outside world.
Otherwise the containers are isolated and do not share process and
other namespaces.

My impression from the documentation is that I should create a version
of systemd-nspawn@.service that uses JoinsNamespaceOf to join the
namespace of the main service for the pod. That main service should
configures container networking, expose ports to host etc. For that I
plan to use systemd-nspawn --network-veth  ...

The problem I do not see how to pass the name of the main service
created with systemd-nspawn to that template. Obviously I can create
own unit for the main service that contains PrivateNetwork=true, but
then I cannot use --network-veth with nspawn as that configures the
namespace that nspawn creates, not the one from the unit.

Any suggestions?
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