For websocket? Yes (https://github.com/SocketCluster/loadbalancer https://github.com/SocketCluster/loadbalancer), but you would have to introduce another layer

For websocket? Yes (https://github.com/SocketCluster/loadbalancer https://github.com/SocketCluster/loadbalancer), but you would have to introduce another layer (AFAIK) that would detect failure and reconnect to a healthy target without informing the client.