Set environment variable CLUSTER_CONF to something in the form of servergroupname~locationdir~172.17.0.2:9000,~172.17.0.3:9000-backup;servergroupname2~locationdir2~172.17.0.4:9000;. May use arbitrary numbers of server groups separated by ';' character, also may use arbitrary numbers of host configuration separated by ',' character. If host configuration needs a space then use '-' character. Each server group will use the upstream conf to create groups. Each locationdir will generate a fastcgi location using the value of the lcoationdir to match on. Fastcgi servers are expected to be lavenderflowerdew/alpine-perl-fastcgi.