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swarm-victoriametrics: forward the container's journal to the swarm collector

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The metrics store's container now runs the journal forwarder the other
service containers run, pushing to a receiver of its own on the swarm
collector (serviceProducers swarm-victoriametrics) as a new machine OIDC
client (swarm.victoriametrics.otel.clientId), registered by a glue file
wherever authelia runs and published to the store by the secret publisher.

The container keeps its loopback-only netns. The collector cannot dial a
unix socket, so swarm-victoriametrics-egress-relay, a socket-activated
systemd-socket-proxyd inside the container, takes its connections on
127.0.0.1:4380 and passes them to /run/swarm-victoriametrics-egress/egress.sock.
The host's nginx listens there and sends /swarm-victoriametrics/ to the swarm
collector and /api/oidc/token to authelia, both by name and verified, and
refuses every other path. nginx gets ReadWritePaths on that directory and
removes a stale socket before it starts.

The container cannot reach the store, so the client secret is fetched on the
host by swarm-victoriametrics-forwarder-oidc under swarm-metrics-auth's leaf,
the shape swarm-bao-forwarder-oidc has, and bound into the container
read-only. The forwarder module gains hostSecretFile for that: set, it renders
no fetch unit. swarm-metrics-auth's policy gains one read stanza on the
forwarder's client path.

The container drops --link-journal=host, and the host collector stops reading
it.

Also lists the forge publisher's and matrix-ctl's leaves in the forwarder
secrets row of docs/swarm/secrets.md, which the hive-forge/hive-matrix change
missed.
This commit is contained in:
atlas 2026-10-16 12:05:10 +02:00 • committed by mara
commit 7294707d7d
15 changed files with 454 additions and 62 deletions
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37
nix/host-modules/glue-victoriametrics-otel-oidc-client.nix Normal file
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# Glue: register the metrics store container's journal forwarder as an OIDC
# client wherever authelia runs.
#
# ONE PAIRING PER FILE: that forwarder ← authelia, and nothing else.
# Without it authelia mints no secret, the publisher has nothing to copy into
# the store, and the forwarder's export is a 401.
#
# Gated on authelia being HERE, not on this host running the metrics store: a
# client is a row in THIS host's provider config, the split
# ./glue-swarm-bao-otel-oidc-client.nix makes for the same reason.
{
lib,
config,
...
}:
let
hyperhiveCfg = config.services.hyperhive;
clientId = hyperhiveCfg.swarm.victoriametrics.otel.clientId;
in
{
config = lib.mkIf hyperhiveCfg.deploy.authelia.enable {
services.hyperhive.swarm.authelia.oidc.clients = [
{
id = clientId;
description = "HyperHive metrics store journal forwarder";
kind = "machine";
redirectUris = [ ];
# Its own id as its own permitted audience, the one the swarm
# collector's receiver for this container checks.
audience = [ clientId ];
# The receiver verifies the token offline against `/jwks.json`;
# authelia's default opaque handle fails there.
accessTokenSignedResponseAlg = "RS256";
}
];
};
}