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How to add extra hosts to docker containers
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If you need to add extra hosts to any of the docker services, you can do that by adding them in the `docker-compose.override.yml` file,
which is located in `/home/fleio/compose`.

The following syntax should be used:

.. code-block:: python

    version: "3.7"
    services:
      backend:
        extra_hosts:
          - "example1:10.10.10.2"
          - "example2:10.10.10.3"
      celery:
        extra_hosts:
          - "example1:10.10.10.2"
          - "example2:10.10.10.3"
      celerybeat:
        extra_hosts:
          - "example1:10.10.10.2"
          - "example5:10.10.10.5"
      updated:
        extra_hosts:
          - "example1:10.10.10.2"
          - "example6:10.10.10.6"
      incomingmail:
        extra_hosts:
          - "example1:10.10.10.2"

Finally, you need to run `fleio recreate` in order to apply the changes. Note that all Fleio containers will be re-created,
so any manual change inside docker containers will be lost.