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Swarm's nested DinD-node daemons plus the backup DR drill (LUKS loop image, per-node registry pulls) fill the ~50 GB root fs and trip the <6 GB abort guard in utils/tests/swarm/matrix.py, while /mnt is a separate ~74 GB partition sitting idle behind only a swapfile. Add a runner step that moves the host Docker data-root to /mnt/docker when /mnt is a separate, roomier partition (detection mirrors enlarge_swap.sh), before any Docker usage. Best-effort: any failure rolls Docker back onto / and the step still exits 0, so it can never turn a green deploy red. Wired into the compose, swarm, and host deploy workflows. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>