Albin Kerouanton d18b88fd32 daemon: add ULA prefix by default ...

So far, Moby only had IPv4 prefixes in its 'default-address-pools'. To
get dynamic IPv6 subnet allocations, users had to redefine this
parameter to include IPv6 base network(s). This is needlessly complex
and against Moby's 'batteries-included' principle.

This change generates a ULA base network by deriving a ULA Global ID
from the Engine's Host ID and put that base network into
'default-address-pools'. This Host ID is stable over time (except if
users remove their '/var/lib/docker/engine-id') and thus the GID is
stable too.

This ULA base network won't be put into 'default-address-pools' if users
have manually configured it.

This is loosely based on https://datatracker.ietf.org/doc/html/rfc4193#section-3.2.2.

Signed-off-by: Albin Kerouanton <albinker@gmail.com>

2024-05-29 22:38:27 +02:00

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