<% if @tornado_ports.length > 1 -%>
<% @tornado_ports.each do |port| -%>
upstream tornado<%= port %> {
    server 127.0.0.1:<%= port %>;
    keepalive 10000;
}
<% end -%>
<% @tornado_groups.each do |group| -%>
<% if group.length > 1 -%>
upstream tornado<%= group.join('_') %> {
    random;
<% group.each do |port| -%>
    server 127.0.0.1:<%= port %>;
<% end -%>
    keepalive 10000;
}
<% end -%>
<% end -%>
<% else -%>
upstream tornado {
    server 127.0.0.1:9800;
    keepalive 10000;
}
<% end -%>