How do I increase available connections for mongodb replicas?

Other MongoDB Topics
1

I have 3 replicas setup across 3 vps. Each vps has ulimit -n of 1024. I think its not possible to change that limit. When I use this command in any vps in mongosh I get 767 which is low given I will need at least 1000 for a single vps instead of 1000 with 3 vps combined. So I need help. Is it possible to change db.serverStatus().connections such that for each vps it has available connections separate or something like that or push overall avaiable connections higher than 767, preferable 1500 or 2000.

rs0 [primary] test> db.serverStatus().connections
{
  current: 52,
  available: 767,
  totalCreated: 173,
  rejected: 0,
  active: 17,
  threaded: 52,
  exhaustIsMaster: 0,
  exhaustHello: 15,
  awaitingTopologyChanges: 15
}
rs0 [primary] test>

If these nodes werent replicas but single independent nodes, I think they would have separate available connections such that it wont go low (each vps will have around 400-600 out of 1000) but it seems here its shared connections but i cant run independent nodes.

2

Had to put ulimit -n 64000 before running mongod in each 3 vps otherwise wasnt working

3

It would be cool if mongod had auto setup option instead of doing; ulimit -n 64000; mongod … But rather mongod --ulimit-auto that automatically sets to required limit so it doesnt complain about low soft limit