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The vocabulary has no word for a unit that runs and exits

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Found by the firewall: every packet filtered as declared, and the machine
reported as not doing what it was told, because the unit that loaded the rules
had finished. Stated as a gap rather than worked around silently.
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jschoubben
2026-08-31 01:20:58 +02:00
parent 0ac99f0d68
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03-DESIGN/01-to-be/08-connectivity.md
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@@ -317,6 +317,18 @@ something:
| **flush the ruleset** when loading | that empties every table on the machine, the runtime's among them. Only the mesh's own table is replaced, and it is declared empty first so the replacement works on a machine loading one for the first time | | **flush the ruleset** when loading | that empties every table on the machine, the runtime's among them. Only the mesh's own table is replaced, and it is declared empty first so the replacement works on a machine loading one for the first time |
| carry a **command to load itself** | the link may not carry an action ([ADR 0005](../../02-DECISIONS/0005-the-node-host.md)). A service is declared to reflect the file instead, so replacing it restarts what loads it — the shape that rule leaves, used here for the first time for its real purpose | | carry a **command to load itself** | the link may not carry an action ([ADR 0005](../../02-DECISIONS/0005-the-node-host.md)). A service is declared to reflect the file instead, so replacing it restarts what loads it — the shape that rule leaves, used here for the first time for its real purpose |
**A module that wants a rule set brings the unit that loads it.** Found the hard way: the unit a
distribution packages for nftables runs, applies the rules and exits, so it is neither running nor
stopped — and a host asked for a service that is "running" reports, quite correctly, that it is
stopped. Every packet was filtered exactly as declared and the machine was marked as not doing what
it was told.
**The vocabulary has no word for "ran, did its job, and exited"**, and that is a real gap rather
than a wording problem: the whole class of configuration-applying units — packet filters, sysctl,
tmpfiles — is shaped that way. Until there is one, a module ships a unit that stays, which is also
the better shape: how a machine enforces rules is a fact about the machine, and the mesh has no
business depending on what a distribution happens to package.
**One thing is derived from what is assigned and not yet from the overlay's shape**, and it is **One thing is derived from what is assigned and not yet from the overlay's shape**, and it is
stated here rather than discovered: **a hub's own listening port.** A hub accepts inbound stated here rather than discovered: **a hub's own listening port.** A hub accepts inbound
connections from every node at other sites; a node that is not a hub dials out and needs nothing connections from every node at other sites; a node that is not a hub dials out and needs nothing