It is also worth checking out the [`examples/` directory from upstream](http://www.haproxy.org/git?p=haproxy-1.7.git;a=tree;f=examples).
-Note: Many configuration examples propose to put `daemon` into the `global` section to run HAProxy as daemon. Do **not** configure this or the Docker container will exit immediately after launching because the HAProxy process would go into the background.
yosifkit