defaults timeout connect 5s timeout client 5s timeout server 5s resolvers docker nameserver dns1 127.0.0.11:53 resolve_retries 3 timeout resolve 1s timeout retry 1s hold other 10s hold refused 10s hold nx 10s hold timeout 10s hold valid 10s frontend http_front mode http bind *:8080 default_backend http_back backend http_back mode http option forwardfor server server01 bunkerweb:8080 check resolvers docker resolve-prefer ipv4