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# helpdesk
s
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c
what i understood is redis is needed fo multi-node setup. I f we have multiple livkeit server nodes ..bt what is the use of it in livekit in multinides
a
It is used for the nodes to communicate things like rooms created and participants connected, also to communicate with Egress and Ingress services. It is never used to send audio/video data, tracks are sent using webrtc only
c
what is pub/sub used for then ??
what is the role of redis in a single node livekit?
a
Pub/sub is used for communication: https://github.com/livekit/psrpc Single node LiveKit does not need redis unless you want to use the Egress or Ingress services
c
Thanks for the reply