zone "<%= zone %>" {
    type slave;
    <% if zone.match(/\//) %>
    file "<%= zonedir %>/db.<%= zone.sub(/\//, '-') %>";
    <% else %>
    file "<%= zonedir %>/db.<%= zone %>";
    <% end -%>
    <% master.each_pair do |k, v| -%>
    masters { <% v['ip'] %> };
    <% end -%>
    allow-transfer { none; };
};