Trouble with load balancing socket.io with redis and nginx

[lenguyenkhoi21]

I've 3 server socket.io, using redis adapter and nginx for load balancing. When I test in my computer, there is only server is using, and the last two server socket.io can't be routed to ? How to test with three server routing ? Here is my code: https://github.com/lenguyenkhoi21/socketio-scale

[darrachequesne]

It seems the session stickiness is based on the IP, so you need clients from different IP adresses.

Please check the example here: https://github.com/socketio/socket.io/tree/master/examples/cluster-nginx

[lenguyenkhoi21]

Yes, I'm using same at you.

[darrachequesne]

@lenguyenkhoi21 in that case, if you run docker-compose up -d --scale=client=10 client to create multiple client containers (each with a different IP address), and then check the logs with docker-compose logs client, you should see that each client is connected to a different server:

client_3         | connected to Paul
client_3         | connected to Ringo
client_3         | connected to Ringo
client_8         | connected to Ringo
client_6         | connected to George
client_6         | connected to Ringo
client_6         | connected to Ringo
client_4         | connected to Paul
client_4         | connected to Ringo
client_2         | connected to Paul
client_2         | connected to Ringo
client_7         | connected to Ringo
client_10        | connected to George
client_10        | connected to Ringo
client_5         | connected to John
client_5         | connected to Ringo
client_9         | connected to John
client_9         | connected to Ringo
client_1         | connected to Ringo

I think that's the easiest way to test the load balancing in local.

[lenguyenkhoi21]

@darrachequesne I have my solution. Just remove nginx from docker-compose, export the port of 3 server instance from docker, and running nginx in my window. I'm using more devices and it load-balancing