Socket.io helpful links

• https://socket.io
• https://socket.io/docs/server-api/
• https://socket.io/docs/emit-cheatsheet/
• https://socket.io/docs/rooms-and-namespaces/

Redis, PUB/SUB helpful links

• https://redis.io/topics/quickstart
• https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-redis-on-ubuntu-16-04
• https://redis.io/topics/rediscli
• https://redis.io/topics/pubsub
• https://github.com/NodeRedis/node_redis
• https://github.com/socketio/socket.io-redis
• https://github.com/socketio/socket.io-emitter

Redis commands

1. Connect to redis redis-cli -r 1 -h localhost -p 6379
2. Subscribe to chanel by pattern psubscribe '*'
3. Monitor events redis-cli monitor
4. Subscribe to chanel SUBSCRIBE chanel1
5. Publish message to chanel PUBLISH chanel1
6. Change DB select 2
7. Count keys dbsize