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README documents DeerFlow as deployed by default "in a local trusted
environment (accessible only via the 127.0.0.1 loopback interface)", but both
compose files published nginx as `"${PORT:-2026}:2026"`, which Docker binds to
0.0.0.0 and [::]. The shipped artifact did not match its own documented
default, so running it on a LAN or cloud host produced a wider surface than
the docs implied without the operator changing anything -- and the agent can
execute commands.
Publish as `"${BIND_HOST:-127.0.0.1}:${PORT:-2026}:2026"` in both compose
files, so the default matches the documented model while operators who front
the stack with their own TLS/auth can still widen it via BIND_HOST. The
Gateway keeps binding 0.0.0.0:8001 inside the container (nginx reaches it over
the compose network) and its port stays unpublished, so the published nginx
port is the entire external surface.
BREAKING CHANGE: a deployment that relied on the previous 0.0.0.0 default
becomes unreachable from other hosts after this upgrade. Set BIND_HOST=0.0.0.0
in .env to restore it, after putting authentication in front and completing
first-run setup.
Also:
- .env.example documents BIND_HOST and PORT with the reasoning.
- deploy.sh reports the address the stack actually bound and, when it is not
loopback, tells the operator to complete first-run setup immediately. It
reads BIND_HOST/PORT from .env via a new read_dotenv_value helper following
compose precedence; the shell does not source .env, so reading the
environment alone would have reported "loopback only" for a stack .env had
exposed. The pre-existing ${PORT} summary line had the same defect and is
fixed with it.
- test_compose_default_bind_host.py pins the loopback default, that BIND_HOST
stays overridable, and that no service in either compose file publishes a
port without an explicit bind address, so a later addition cannot drift back
to 0.0.0.0 unnoticed.