How to load balance backend to a shard

Hi

I want to associate a set of backends with a user/tenant and load balance those backends by user/tenant.

I want the same user id to load balance to the same set of servers.

I am reading Haproxy sourcecode trying to work out where to put this functionality.

Say I have X tenants or users and Y servers. The users only exist on X/Y servers.

I suspect I can (a) download a user to server mapping list on startup. (B) introduce a header that the backend server replies with the set of servers to be used by that user once logged in.

I need to override the load balancing to only use servers that are mapped by a user id. A user stays on a particular server

I could generate a very large configuration file but I was hoping there was a way I can do this dynamically. I could use Consul and consul template to template the user to server mappings for example.

defaults
  mode http
  timeout client 10s
  timeout connect 5s
  timeout server 10s 
  timeout http-request 10s

frontend frontend
  bind 127.0.0.1:80
  default_backend serverfarm
  

backend serverfarm
  sharding cookie SERVER  shardserver:5006/users.json
  cookie SERVER insert indirect nocache
  server server1 server1:8000
  server server2 server2:8000
  server server3 server3:8000
  server server4 server4:8000
  server server5 server5:8000
  server server6 server6:8000
  server server7 server7:8000
  server server8 server8:8000
  server server9 server9:8000

1 post - 1 participant

Read full topic