The qm-set I/O caps were previously only applied by manual one-shot
runs of apply-mbps-caps.sh, so any config drift (manual `qm set`,
config restored from /mnt/backup/pve-config like we did on 2026-05-26,
fresh VM clone) would leave the affected VM uncapped until someone
remembered to re-run the script.
Adds apply-mbps-caps.service (Type=oneshot) + apply-mbps-caps.timer
firing:
- OnBootSec=5min — catches PVE host reboots & restored configs
- OnCalendar=hourly — catches manual qm-set drift / fresh clones
- Persistent=true — runs missed schedule after PVE downtime
- RandomizedDelaySec=2min
Same install pattern as the other PVE operational scripts (nfs-mirror,
daily-backup, offsite-sync-backup, lvm-pvc-snapshot — memory id=609 +
id=542). Source in this repo, deployed to /usr/local/bin + /etc/
systemd/system/ on the PVE host.
Script hardening: kept `set -uo pipefail` but dropped `-e` so one
missing VM doesn't abort the rest; each VM is gated on `qm status`
existence; added a fast-path "already at target" no-op log line for
quiet hourly runs.
Installed on PVE (192.168.1.127) and smoke-tested: all 8 VMs caps
re-applied successfully, next run 12:00 EEST. Journal: `journalctl
-u apply-mbps-caps -f` on the PVE host.
Idempotent qm-set script for the per-VM I/O caps on the PVE host's sdc
thin pool (2026-05-26 session, beads code-9v2j). Caps protect each
Linux VM's share of sdc so a runaway workload (e.g. the 2026-05-23/26
alloy IO storm — memory id=2726) cannot saturate the disk for everyone.
Was sitting in /tmp on PVE — moving the source under version control
and installing to /usr/local/bin/ alongside the other PVE operational
scripts (nfs-mirror, daily-backup, offsite-sync-backup; pattern from
memory id=609). Survives PVE host reboots; safe to re-run on any node
rebuild to restore the caps.
VMIDs covered (Linux only — pfSense 101 and Windows10 300 skipped):
102 devvm 60/60 103 home-assistant 40/40 200 k8s-master 100/60
201 k8s-node1 150/120 202 k8s-node2 150/120 203 k8s-node3 150/120
204 k8s-node4 150/120 220 docker-registry 40/40
