Single Service Instance per Host

Intent

Run a single service instance on each host to maximize isolation and minimize noisy-neighbor issues.

Use when

• Isolation and predictable performance matter more than utilization.
• You want simpler capacity and failure-domain reasoning per service.

Avoid / watch-outs

• Lower density can increase cost; ensure the isolation benefit is worth it.
• Hosts still need consistent provisioning and telemetry.

Skill mapping

• architecture: define deployment isolation requirements and constraints.
• observability: host/service metrics and deploy markers for correlation.