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netwatch/nginx.conf
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Serve Prometheus metrics at /metrics behind basic auth (closes #94)
With METRICS_USERNAME and METRICS_PASSWORD both set, the backend
records request metrics through go-http-metrics and serves them at
GET /metrics behind basic auth with those credentials; nginx passes
/metrics to it. With neither set there is no such route; one alone
stops the start with an error naming both.

Only requests chi has matched to a route are recorded, not every
request as the conventions show: the labels are path and method, which
clients can make up without end. So POST /api/v1/reports is registered
by its full path, not inside a route group.

Deviation: go get and go mod tidy ran directly; no entrypoint adds a Go
dependency yet (#45).

Model: opus-5-5
2026-10-04 01:47:49 +00:00

78 lines
2.8 KiB
Nginx Configuration File

# A template: the nginx image renders it into conf.d at container start,
# filling in PORT and nothing else. bin/entrypoint.sh sets PORT and that
# limit.
server {
listen ${PORT};
server_name _;
# Keep the nginx version out of the Server header and error pages.
server_tokens off;
# The security headers, on every response. An add_header in a
# location drops every add_header from here, so a location with one
# of its own includes this file again.
include /etc/nginx/security-headers.conf;
root /usr/share/nginx/html;
index index.html;
# The client address comes from X-Forwarded-For only on a request
# from the reverse proxies in TRUSTED_PROXIES: bin/entrypoint.sh
# writes one set_real_ip_from line for each into this file, and
# leaves it empty when TRUSTED_PROXIES is unset, so that by default
# the client address is the one each request comes from.
include /etc/nginx/trusted-proxies.conf;
real_ip_header X-Forwarded-For;
real_ip_recursive on;
# Access log to stdout (Docker best practice)
access_log /dev/stdout combined;
error_log /dev/stderr warn;
location / {
try_files $uri $uri/ /index.html;
}
# Cache static assets aggressively
location /assets/ {
expires 1y;
add_header Cache-Control "public, immutable";
include /etc/nginx/security-headers.conf;
}
# netwatch-server, the Go backend, runs in the same container and
# listens on loopback only: bin/entrypoint.sh starts it on
# 127.0.0.1:8081. These headers go with every request passed to it.
# X-Forwarded-For carries only the client address, as resolved by
# the real IP settings above, and not the chain the request came
# with: the backend takes the first entry, which a client can write.
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header X-Forwarded-Proto $scheme;
# netwatch-server sets the same security headers on its own
# responses. Its copies are dropped so that each header goes out
# once, as security-headers.conf sets it.
proxy_hide_header Strict-Transport-Security;
proxy_hide_header Content-Security-Policy;
proxy_hide_header X-Frame-Options;
proxy_hide_header X-Content-Type-Options;
proxy_hide_header Referrer-Policy;
proxy_hide_header Permissions-Policy;
location /api/ {
proxy_pass http://127.0.0.1:8081;
}
location = /.well-known/healthcheck {
proxy_pass http://127.0.0.1:8081;
}
# The backend's Prometheus metrics, behind its own basic auth. Unless
# METRICS_USERNAME and METRICS_PASSWORD are set, it answers 404.
location = /metrics {
proxy_pass http://127.0.0.1:8081;
}
}