potiuk commented on a change in pull request #18068:
URL: https://github.com/apache/airflow/pull/18068#discussion_r706326267
##########
File path: docs/docker-stack/entrypoint.rst
##########
@@ -161,6 +161,34 @@ If there are any other arguments - they are simply passed
to the "airflow" comma
> docker run -it apache/airflow:2.1.2-python3.6 version
2.1.2
+Signal propagation
+------------------
+
+Airflow uses ``dumb-init`` to run as "init" in the entrypoint. This is in
order to propagate
+signals and reap child processes properly. This means that the process that
you run, does not have
+to install signal handlers to work properly and be killed when the container
is gracefully terminated.
+The behaviour of signal propagation is configured by ``DUMB_INIT_SETSID``
variable which is set to
+``1`` by default - meaning that the signals will be propagated to the whole
process group, but you can
+set it to ``0`` to enable ``single-child`` behaviour of ``dumb-init`` which
only propagates the
+signals to only single child process.
+
+
++------------------+-----------------------------------------------------------------------------------------------+
+| DUMB_INIT_SETSID | Use case
|
++------------------+-----------------------------------------------------------------------------------------------+
+| 1 (default) | If you run your processes as ``["bash", "-c"]`` command,
and bash spawn some new processes, |
Review comment:
Right!
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