Pim van Pelt
7ed77f5b22
Make the shared-listen-include pattern work with `reuseport` and the other socket-level listen options. Nginx core enforces at-most-once per sockaddr on options that set lsopt.set=1 (reuseport, bind, backlog=, rcvbuf=, sndbuf=, setfib=, fastopen=, accept_filter=, deferred, ipv6only=, so_keepalive=) and emits "duplicate listen options for <addr>" otherwise. That rule collides with a single listens.conf included from every vhost — each vhost's include re-submits the same options. The listen wrapper now detects the cross-cscf case, strips those options from cf->args before delegating to the core handler, and logs one notice per stripped listen. The first cscf owns the options on the kernel socket; later cscfs merge cleanly via ngx_http_add_server. Protocol-level flags (ssl, http2, quic, proxy_protocol) pass through untouched since nginx OR-merges those across cscfs. This unblocks `reuseport` for deployments that want better new-connection spread across workers. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
nginx-ipng-stats-plugin
Per-VIP, per-device traffic counters for nginx. Ships as a dynamic nginx module and a Debian package that loads into stock upstream nginx on Debian Trixie.
The module attributes every HTTP request to the interface it arrived on, reading the ingress ifindex per connection from the
kernel's IP_PKTINFO / IPV6_PKTINFO cmsg. Listening sockets stay plain wildcards, so outgoing packets follow the normal
routing table — which is what makes this safe for DSR / maglev deployments where the SYN arrives via a GRE tunnel and the
SYN-ACK must leave via the default route. Counters — requests, status codes, bytes, latency histograms — are exposed as
Prometheus text or JSON from a single HTTP scrape endpoint, filtered per-source. This is useful for any deployment where
traffic arrives on distinct interfaces — GRE tunnels, VLANs, bonded links, or plain ethernet — and per-interface observability
is needed.
Without any device=/ipng_source_tag= parameters, the module still counts and exposes per-VIP traffic under the configurable
default source tag (direct), which makes it a useful plain observability module for any nginx host.
See docs/design.md for the full design, including the attribution model, data flow, and requirements.
Quick start
make install-deps # install build and test dependencies (apt)
make build # build the .so out-of-tree
make pkg-deb # build a .deb package
make robot-test # run end-to-end tests via containerlab
Installing
sudo dpkg -i build/*.deb
The package installs the .so into /usr/lib/nginx/modules, drops a load_module stanza into /etc/nginx/modules-enabled/, and runs
nginx -t before completing.
Configuring
See docs/user-guide.md for an end-to-end walkthrough and docs/config-guide.md for the
directive and listen parameter reference.
License
Apache-2.0. See LICENSE.