The frontend nginx used a literal proxy_pass host with no resolver, so it
pinned mempool-api's IP at worker startup. When the backend restarts (gate,
OTA, crash, reboot re-IPAM) podman reassigns its IP and nginx keeps proxying
to the dead one -> /api hangs, websocket 502s, UI shows 'offline' until a
manual nginx reload. Same stale-upstream-IP class as the netbird 502.
Fix: mempool-frontend:v3.0.1 rewrites the generated nginx-mempool.conf to
re-resolve the backend per-request via 'resolver' + a variable proxy_pass.
Resolver address is read from /etc/resolv.conf (podman aardvark-dns answers
on the network gateway, not Docker's 127.0.0.11). Per-location path mapping
preserved (ws -> '/', /api/v1 identity via no-URI, /api/ -> /api/v1/ rewrite).
Proven on .228: backend IP change now auto-recovers with no reload; the
literal-host control still 502s. Migrated the manifest off the retired
tx1138 registry to vps2.
Also: mempool.bats #74 waited only 180s post-restart (the slow path) and
called an undefined 'fail' helper (status 127). Bumped to 300s to match the
passing parity probes and emit a real failure instead.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The 1x gate is green; the 5x failed iters 1-2 on readiness-under-churn (apps DO
recover — lnd synced, mempool just mid-restart when probed — but slower than the
windows when restarted back-to-back). Hardening:
- run-20x.sh: best-effort settle_stack() before each iteration (wait for
mempool-api/frontend + lnd RPC healthy, 180s, on-node, never fails the run).
- required containers present/running (80/81): wait-loops (180s) not single-shot.
- mempool api/frontend (87/88): retry ~180s not single-shot.
- mempool queryable (74): 60s->180s. lnd restart-running (64): 120s->240s.
lnd getinfo (60): 90s->240s retry.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Brings L1 (RPC API) + L3 (lifecycle survival) parity coverage to the
three multi-app stacks that were previously only touched by
required-stack.bats. Combined with bitcoin-knots / lnd / electrumx
already shipping, the six core apps now have dedicated bats files.
Each suite is shaped like the existing single-container suites
(bitcoin-knots / lnd / electrumx) and gates every assertion on the
backing container actually being present, so a node without the stack
installed gets clean skip messages instead of false fails.
* btcpay.bats — 9 tests, including stack-wide presence and a
"supporting containers don't cascade-restart" guard
* fedimint.bats — 8 tests, single container
* mempool.bats — 9 tests, mixed legacy + orchestrator-managed stack;
reuses the :8999 mempool-api probe from required-stack for parity
Total bats now: 88 (was 53 → +35).
TESTING.md matrix advances 23 → 50 of 110 cells.
UI URL coverage for these three apps already lives in
ui-coverage.bats, so this PR doesn't duplicate proxy-path probes.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
