Next create another folder in which dehydrated will place its configuration, certificates etc.,
in this tutorial it will be called ``dehydrated-data``. In this folder, create a file called
``domains.txt`` in which you list the domains you want to create certificates for, using the
following format:
- each domain on a new line
- subdomains of a domain on the same line as the domain.
For more information on the format, see [https://github.com/lukas2511/dehydrated/blob/master/docs/domains_txt.md](https://github.com/lukas2511/dehydrated/blob/master/docs/domains_txt.md)
## Using docker-dehydrated
Now you can just run the container, and as the default challenge is the HTTP-Challenge, you do
not need to pass environment variables to alter the default behaviour. To run the container,