What was in the catalogue was the first thing I built, not the thing ADR 0146
describes. It dialled raw ports on machine addresses from one hosting form and
emitted nothing, so findings would have sat in a file on the machine — the exact
thing issue 145 is about. It was never registered, never assigned, and never ran.
0146 says names per hosting form, fetched over TLS with the certificate verified,
and machines discovered over the bus. That shares nothing with this but the word
checker, so it goes rather than being bent into shape. Recorded as work to be
analysed and built deliberately.
Connectivity is checked by hand in the meantime, against the services the mesh
already runs.
The mesh asserts three things are callable (ADR 0144) — what runs on the same
machine, another machine's service exposed to the private network, and another
machine's service exposed publicly — and has never checked any of them. The first
was broken for eleven hours while the mesh reported every machine healthy.
This runs on every machine, on the cadence the mesh already has, in its own
container: the same position every other module calls from. Not the host and not
the control plane, both of which reach these addresses by paths no ordinary caller
uses and would have passed throughout that outage.
**Its probe is its own endpoint, and that is the point.** Declared reachable over
the private network like any other service, so it is admitted by exactly the rule
that governs every internally-exposed service and fails when that rule is wrong.
The tempting target is a service every machine has, and those are the ones never
closed — ssh above all — which would have passed while the thing that actually
broke was a service exposed to the private network.
It resolves before it dials and says which failed, because a name that does not
resolve and a port that does not answer have different owners. One failure is not
a fault: a machine rebooting is ordinary, so a path is broken after consecutive
runs and the count travels with the result. It reports and repairs nothing.
novox/hq ADR 0145. Eight tests; the consecutive-failure logic proved by reverting
it once. Not yet registered or assigned.
jschoubben
mesh-admin