Refresh connection pools after client-certificate rotation
Long-lived connections keep using the old client identity after new credentials are loaded.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Connection lifecycle
Estimated field mix
- Networking50%
- Security30%
- Site reliability20%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional internal report exporter uses mutual TLS. Certificates are renewed manually, and operators cannot distinguish peer identity failures from network outages.
Setup prerequisites
- Generate disposable test-only certificate authorities and leaf certificates for loopback services; use no production keys.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Bind pools to certificate generation.
- Stop assigning new requests to retired pools.
- Drain existing connections within a declared deadline.
Implementation constraints
- Do not terminate healthy requests without the documented drain policy.
Verification to include
- Rotate while a request is active.
- Verify new connections use the new certificate generation.
Deliverables
- Certificate-aware pool lifecycle.
Rollout and recovery
Roll out with a bounded overlap; preserve prior public trust during drain.
Value of the work
For the engineer: Practice transport identity, trust-store changes, and certificate failure diagnosis.
For the team: Provide repeatable rotation and recovery behavior for authenticated service communication.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.