The connection plugin contains an Airflow macro for templating connections in tasks. You can use it like this:
# prints 'mysql'
{{ macros.connection_plugin.get_conn('airflow_db').host }}
connection_plugin.get_conn
returns the Connection object
that you can interact with as described in the documentation.
pip install airflow-connection-plugin
To start the docker container simply run the following command in the root directory:
cd example && docker-compose up
After that you can reach the airflow frontend via http://localhost:8080. You will find an example DAG that demonstrates how to retrieve different connection information.
Attention: Be especially careful when using passwords in templates.