Database / BetterDB Interview questions

Which is better for VPC-only instances: SSH tunnel or the BetterDB agent?

It depends on the topology. An SSH tunnel through a bastion works well for single-node or primary monitoring, but it has a documented limitation with clusters: only the one connection you configure is tunnelled, while Valkey Cluster and Sentinel nodes are contacted directly using the addresses they themselves advertise, bypassing the tunnel entirely. If those other nodes are only reachable via the bastion, their per-node views simply won't load.

@betterdb/agent takes a different approach for VPC-only instances like ElastiCache or MemoryDB: it reaches them over an outbound WebSocket, so there's no need to open inbound access through a bastion, and it handles the multi-node fan-out that a single SSH tunnel can't.

In short: SSH tunnel for a single primary behind a bastion; the agent when you need full cluster visibility into a private subnet.

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What outbound-only mechanism does @betterdb/agent use to reach VPC-only databases? An outbound WebSocket

✓ Correct! Well done.

A VPN client bundled in Docker

✗ Try again if not.

Direct public internet exposure

✗ Try again if not.

An inbound SSH port

✗ Try again if not.

Which approach better handles cluster fan-out in a private subnet? The BetterDB agent

✓ Correct! Well done.

Neither works for clusters

✗ Try again if not.

A single SSH tunnel

✗ Try again if not.

Prometheus federation

✗ Try again if not.

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