alibaba/tengine — pull request #357 by microhuang (2013-12-12 04:23:46+00:00)
Title: support standby module when there is only master 

upstream services{
server 127.0.0.1:80;
server 127.0.0.1:81 weight=5 backup; #standby
server 127.0.0.1:82 weight=3 backup; #standby
server 127.0.0.1:83 weight=1 backup; #standby
}

upstream services{
server 127.0.0.1:80;
server 127.0.0.1:81;
server 127.0.0.1:82;
server 127.0.0.1:83 weight=1 backup;
}