The small GitHub runner shape (AWS, 72G root) ran out of disk in swarm and compose rows (#1329: WordPress#2 of run 41261531965, Nextcloud#6 and #7 of run 41262286962) while an empty instance-store disk nvme1n1 sat unused. mount_spare_disk.sh formats and mounts it at /mnt, but only on a GitHub-hosted runner outside act, and only a whole unpartitioned disk without any signature, mount or swap use of at least 75G; every decline leaves a notice. relocate_docker_dataroot.sh then bind-mounts /var/lib/containerd from the spare disk and moves the Docker data-root to /mnt/docker-host (not /mnt/docker, which is the nested daemon's volume that dedicated.sh wipes). It refuses before stopping anything when images, volumes, build cache, foreign containerd namespaces or shims exist or daemon.json is unreadable, and rolls back the bind mount and daemon.json on any later failure or cancel. Swap goes on / once containerd lives on /mnt, dump_state.sh logs disk size, model and free space per storage root, and the swarm watchdog samples / and /var/lib/containerd every 10 s.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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>
kevinveenbirkenbachandClaude Opus 5.5