How to scale a socket server?

Question

Node.js

There is a service written in Node.js that opens a connection socket. How to scale such a service, with a high load of active socket connections? How to shard the list of online users (socket list) between servers - where are the same Node.js services running?

Answer 1

Node.js design patterns / per. from eng. A. N. Kiseleva. – M.: DMK Press,
2017. – 396 p.: ill.
ISBN 978-5-97060-485-4
With 300 pages describe the solution to similar problems