ADR-D25: HPC operation mode¶

Status:: Accepted (mode B primary, mode C deferred)
Date:: 2026-05-05
Decided:: 2026-05-06 (user confirmation)
Phase:: F-OPS
Gate:: opens at F-OPS entry

Context¶

PROTEA must support HPC environments (BSC and similar). HPC sites typically forbid privileged Docker, may restrict outbound network, and schedule via SLURM. Two main modes are available:

Mode B: stateless workers running on HPC nodes connect to a PostgreSQL and RabbitMQ hosted in the cloud (LifeWatch / EOSC).
Mode C: fully airgapped batch bundle. .sif Apptainer image with snapshot DB precargado, default booster, single-node SLURM job, no outbound traffic.

Decision (recommended)¶

Both. Mode B as primary (closer to the cloud architecture). Mode C as fallback for sites without outbound network or strict data-sovereignty constraints.

Consequences¶

Two SLURM templates (deploy/hpc/slurm-mode-b.sh, deploy/hpc/slurm-mode-c.sh).
Apptainer .sif produced from the OCI multi-stage builds (see D26).
Airgap bundle (protea-airgap-bundle-vX.Y.Z.tar.gz) tested on a network-disconnected machine.

Resolution¶

Accepted with scope adjustment. User confirmation 2026-05-06: mode B primary, mode C deferred until post-defensa (when contact with BSC or similar restricted sites becomes concrete). Mode B is sufficient for the thesis defense scope: stateless PROTEA workers on HPC nodes connecting to LifeWatch / EOSC-hosted Postgres + RabbitMQ. Mode C (airgap .sif bundle) becomes a F9 post-defensa item.