func (p *InstancePortTable) nextPort(host net.IP, from port.Port) port.HostPort {
key := port.HostPort{host.String(), 0}
for port := from; ; port++ {
key.Port = port
if _, ok := p.reserved[key]; !ok {
p.reserved[key] = true
return key
}
if port > 65535 {
port = 40000
}
}
panic("Unable to locate a valid port")
}
