Use the following in your hydra.conf to make your instance a private Hydra instance (public is the default):
private 1
Currently, this will not allow you to use the API, channels and the binary cache when running in private mode. We will add solutions for these functionalities later.
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<form class="navbar-search" action="[% c.uri_for('/search') %]">
<input name="query" type="text" class="search-query span2" placeholder="Search" [% HTML.attributes(value => c.req.params.query) %]/>
</form>