custom routing rule for Ribbon

DevLBRule.java

public class DevLBRule extends AbstractLoadBalancerRule {

    @Value("${some.ip.prefix}")
    private String ipPrefix = "10.20.";

    @Override
    public void initWithNiwsConfig(IClientConfig iClientConfig) {

    }

    @Override
    public Server choose(Object key) {
        List<Server> upList = getLoadBalancer().getReachableServers();
        if (upList != null) {
            for (Server server : upList) {
                if (server.getHost().startsWith(ipPrefix)) {
                    return server;
                }
            }
        }
        return null;
    }
}