Load balancing without Eureka in AWS ECS

[kwiwon]

Hello,
I was hoping that route53 could cover the service-discovery part which it should be. So theoretically Zuul could use the service list to start to do load balancing. But looks like the routing will be hot-hitting the service instance 1 for a while, and then switching to the service instance 2.
After taking a look at the ribbon configuration, maybe the "listOfServers" could be the reason because it is not a list but just the server-id say "xxx.service.es".

So I tried to override the getUpdatedListOfServers() in ConfigurationBasedServerList like this

@Override
    public List<Server> getUpdatedListOfServers() {
        List<Server> listOfServers = super.getUpdatedListOfServers();
        List<Server> newListOfServers = new ArrayList<>();
        for (Server server: listOfServers){
            try {
                final InetAddress[] inetAddresses = SocketUtils.allAddressesByName(server.getHost());
                for (InetAddress addr: inetAddresses){
                    newListOfServers.add(new Server(addr.getHostAddress(), server.getPort()));
                }
            } catch (UnknownHostException e) {
                e.printStackTrace();
            }
        }
        if (newListOfServers.isEmpty()){
            // There is no IP to be resolved, maybe the service is down. So return the same listofservers to have another chance to resolve.
            return listOfServers;
        }
        // Sort the list so it can remain the same order so the Load Balancing Rule can keep the consistency
        newListOfServers =
                newListOfServers.stream().sorted(Comparator.comparing(Server::getHost)).collect(Collectors.toList());
        return newListOfServers;
    }

My idea is, instead of getting a single listOfServers in configuration, I use that domain name to get all IP addresses so the LB rule can at least have a list to pick.
And with all others are default setting, I can see now Zuul starts to do round-robin LB.
Out of curiosity, is this the best way to work with route53? Or I have just misconfigured something like I shouldn't use listOfServers.
Thanks for your time.

[MiKKiYang]

yo bro，good idea @kwiwon