Base image moves from AlmaLinux 9 to 10, which forces two related changes:
EPEL repo URL bumps to the el10 release RPM, and tini is replaced with
dumb-init as PID 1 since tini is not packaged in EPEL 10. Both provide the
signal forwarding and zombie reaping the wedged-container fix relies on.
Nginx 1.26 in AlmaLinux 10 deprecates the `listen ... http2` parameter, so
the server block now uses the separate `http2 on;` directive.
Also fixes three issues that affected WebSocket apps (socket.io, ws):
- `Connection: upgrade` was hardcoded on every proxied request, including
ordinary HTTP. Now driven by a `map $http_upgrade $connection_upgrade`
so only genuine upgrade requests carry it.
- No explicit proxy read/send timeout meant idle WebSockets were cut at
nginx's 60s default. Set to 600s, which clears any sane heartbeat without
pinning connection slots (worker_connections is 512, two per client).
- `large_client_header_buffers 2 1k` returned 400 for any single header
line over 1KB, which session cookies and bearer tokens routinely exceed.
Raised to the nginx default of 4 8k; buffers are allocated on demand, so
this only costs memory for requests that need it.
Verified by rendering the generated config and running it under nginx with
a Node backend: WebSocket handshakes return 101 and reach the upstream
'upgrade' event, polling requests arrive with `Connection: close`, and a
3KB cookie returns 200 where the old buffer setting returned 400.
README gains a WebSocket Support section covering the PM2 cluster-mode
trap, the concurrency ceiling, and reconnects on memory restarts.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
shadowdaoandClaude Opus 5
e417a908f2