> and the main point is: there is no need to replace network.service on
> *any* static configured machine
(As a short-time initscripts comaintainer way-back-when:) There may not be a
need for anything smarter than init.d/network for machines with _trivial_
static configuration (a few interfaces with static IP addresses), but it starts
breaking down very quickly with more complex setups.
Networking is inherently a DAG: IP alias ON TOP OF a bond ON TOP OF an Ethernet
vlan ON TOP OF a vlan trunk connected through a physical cabe¹, and frequently
when something changes in this DAG (change an IP alias, change bond
composition, change vlan tag, change a performance tuning parameter) it would
be useful to also update/refresh configuration of the other related components.
And building the kind of data structure necessary to keep track of these
relationships is pretty much impossible in the shell language², so it hasn’t
been done. init.d/network more or less assumes that the complex cases don’t
happen instead of supporting them properly.
Mirek
¹ This may be a nonsensical example, it’s been about 8 years. But I am
confident about the gist of the issue.
² Well, after seeing ifup-aliases, my sense of what is “pretty much impossible
in the shell language” has been dulled; but maintaining such relationships is
another order of magnitude more complex than ifup-aliases, and given the speed
of shell a shell daemon (☺) would be needed anyway just to amortize the
overhead of dealing with the DAG.
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