Consul agent report for Consul server that service discovery with output: too open many file

Hi all.

My model deploy:

I use the components:
- Consul with version 1.6.0.
- Service is implemented by Java.
- Consul client Vertx in [here](https://vertx.io/docs/vertx-consul-client/java/).
- Health check service by TCP in [here](https://www.consul.io/docs/discovery/checks).

When I run my service for a short time, the Consul server reports my service is unhealthy. I see report health check on the UI and find consul report that service discovery with output: **too open many file**. Then I check the open socket on the server A that have many TCP connections and it increases continuously.

When I stop my service, I check the TCP connection on servers, it is closed.

I try to increase **ulimit -s** value of server, but the above issue does not resolve. Then I also try set config [tcpKeepAlive](https://vertx.io/docs/apidocs/io/vertx/ext/web/client/WebClientOptions.html#setTcpKeepAlive-boolean-) of Consul client Vertx, but it does not help resolve issue. I don't know that I used the wrong configuration of Consul or not?

I think that the consul agent should use one TCP connection and keep alive it to health check the service or it closes the TCP connection after checking the service.