Database / BetterDB Interview questions

Explain the known limitation of SSH tunnels with cluster topologies?

SSH tunnelling in BetterDB Monitor only covers the single connection you explicitly configure.

For Valkey Cluster or Sentinel deployments, BetterDB discovers the other nodes by calling CLUSTER NODES or querying Sentinel, and then connects to those nodes directly using the addresses they themselves advertise – not through the tunnel.

If those other nodes are only reachable via the bastion – a common situation with ElastiCache or MemoryDB sitting in a private subnet – their per-node views simply won't load, even though the primary connection you tunnelled works fine.

The documented workaround is to use SSH tunnels only for single-node or primary monitoring, and for full cluster visibility either place the monitor somewhere it can reach every node directly, or use the outbound-WebSocket-based @betterdb/agent instead.

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How does BetterDB reach other cluster nodes beyond the tunnelled one? Directly, using addresses those nodes advertise via CLUSTER NODES/Sentinel

✓ Correct! Well done.

Through the same SSH tunnel automatically

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It refuses to connect to clusters at all

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Via a second bastion added automatically

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What's the practical fix for full cluster visibility behind a private subnet? Disable cluster monitoring permanently

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Set BETTERDB_SSH_KEY_DIR to a wildcard

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Always use SSH tunnels for clusters

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Deploy the monitor where it reaches nodes directly, or use the agent

✓ Correct! Well done.

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