potiuk commented on a change in pull request #18915:
URL: https://github.com/apache/airflow/pull/18915#discussion_r729040844
##########
File path: docs/docker-stack/entrypoint.rst
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@@ -194,6 +194,69 @@ If there are any other arguments - they are simply passed
to the "airflow" comma
optional arguments:
-h, --help show this help message and exit
+Add your own entrypoint extension
+---------------------------------
+
+Airflow image executes a lot of steps in the entrypoint, but it does not do
everything that you might
+want to run - and you might want to provide your own entrypoint extension that
does any custom operations.
+Such *custom* entrypoint extension should be run after the main entrypoint.
You can even execute
+the usual components of airflow - scheduler, webserver, worker, triggerer in
such extension script.
+The entrypoint extension can be added to the image by extending it:
+
+.. code-block:: Dockerfile
+
+ FROM airflow::2.3.0.dev0
+ COPY my_entrypoint_extension.sh /
+
+
+And then you can run this script by running the command:
+
+.. code-block:: bash
+
+ docker run -it apache/airflow:2.3.0.dev0-python3.6 bash -c
"/my_entrypoint_extension.sh"
+
+Execute custom code before the Airflow entrypoint
+-------------------------------------------------
+
+If you want to execute some custom code before Airflow's entrypoint you can
also add extra code executed
+before the Airflow entrypoint by replacing the entrypoint of Airflow and
calling Airflow's entrypoint as
Review comment:
```suggestion
before the Airflow one by adding new one and calling Airflow's entrypoint as
```
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