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monero: find the chain disk by its label, and a blank one by Proxmox slot

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After the chain disk moved to the SSD, a reboot on 2026-10-04 swapped sda and
sdb, and monero_data_device: /dev/sdb then named the ROOT disk. The root-disk
guard caught it, but a routine run should never have been reading a device
name at all.

Every run now looks for the filesystem labelled monero-data first. If it is
there, monero_data_device is never consulted and the mount goes by that
filesystem's UUID. Only a blank disk is found by name, and the name is now
/dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_drive-scsi1: Proxmox passes the slot
in as the serial, so it is fixed before boot and survives `qm disk move`.

The by-id path is resolved with readlink before the root-disk guard compares
it, since a symlink path is never a prefix of /dev/sdb1 and the guard would
otherwise always pass. The UUID assert now also fails on two disks carrying
the same label.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
This commit is contained in:
counterweight 2026-10-17 17:30:57 +02:00
parent c3a7ca0ba7
commit 71dbfbe5ff
Signed by: counterweight
GPG key ID: 883EDBAA726BD96C
4 changed files with 116 additions and 63 deletions
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10
ansible/host_vars/monerod_box_local/main.yml
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@ -12,11 +12,11 @@ monero_restricted_rpc_port: 18089
# The explorer's HTTP port, read by the Caddy play on the edge host.
xmrblocks_port: 8081
# The 500 GB disk added to this VM in Proxmox as scsi1. Named here rather than
# left to the role default so that "which disk holds the blockchain" is a
# property of the machine, recorded next to the machine. The role only ever
# uses it to create the filesystem; the mount itself goes by UUID.
monero_data_device: /dev/sdb
# The 500 GB chain disk, attached in Proxmox as scsi1. Named by that slot, which
# is fixed when the disk is attached and survives reboots and storage moves -
# not /dev/sdb, which it stopped being on 2026-10-04. Only read when the disk has
# no monero-data filesystem yet; see roles/monero/defaults/main.yml.
monero_data_device: /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_drive-scsi1
# Systemd services deployed on this host, monitored every 5 minutes.
#