infra: per-VM I/O caps + terragrunt v0.77 plumbing + state recovery
WHAT LANDED:
- terragrunt.hcl (root): added telmate/proxmox to k8s_providers
required_providers. Other stacks just don't instantiate a provider
block — harmless. Replaces the same-name override trick the infra
stack used to do, which stopped working under Terragrunt v0.77
("Detected generate blocks with the same name").
- stacks/infra/terragrunt.hcl: new generate "proxmox_provider" block
writes proxmox_provider.tf with the provider config; credentials
read from Vault secret/viktor at plan/apply time (no env vars).
- modules/create-vm: new mbps_rd / mbps_wr number variables (default 0
= uncapped), wired into scsi0/scsi1 disk{} blocks as
mbps_r_concurrent / mbps_wr_concurrent. lifecycle.ignore_changes
extended to scsi6..scsi29 (K8s nodes have many CSI-managed slots),
plus scsihw and qemu_os (vary per-VM; non-trivial live changes).
- stacks/infra/main.tf: docker-registry-vm gains mbps_rd=40,
mbps_wr=40 in HCL — already applied live via qm set on 2026-05-26.
WHAT FAILED AND WAS ROLLED BACK:
- Attempted import of 7 VMs (102 devvm, 103 home-assistant, 200
k8s-master, 201 k8s-node1, 202 k8s-node2, 203 k8s-node3, 204
k8s-node4) via import {} blocks. The telmate/proxmox v3.0.2-rc07
provider mangled proxmox-csi PVC slots on apply for vmid 202 and
203: every scsi slot got rewritten from `vm-9999-pvc-<uuid>` to
the boot disk `vm-<vmid>-disk-0`. Restored both .conf files from
the 2026-05-24 nightly PVE config backup at /mnt/backup/pve-config/
etc-pve/nodes/pve/qemu-server/{202,203}.conf — no reboots, no data
loss, K8s CSI reconciled PVC attachments within minutes. Removed
the 7 imports from state via `terraform state rm` and re-encrypted.
Tracked in beads code-xzbl: blocked on bpg/proxmox provider
migration (telmate has the same dynamic-disk defect that bit us on
iSCSI back in 2026-04-02; see memory id=539).
LIVE CAPS STILL IN PLACE (qm set, 2026-05-26 ~03:13 UTC):
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
(pfSense 101 BSD + Windows10 300 intentionally out of scope.)
PRE-EXISTING DRIFT EXPOSED (NOT NEW):
- HCL declares k8s-master (200) and k8s-node2 (202) but neither was
ever imported into TF state — confirmed against the SOPS-encrypted
state in git (lineage e1cc5bb5, serial 42, last touched 2026-04-06).
This commit leaves both declarations in place but does NOT import
them; that's part of the code-xzbl follow-up.
Closes: code-s9xr
This commit is contained in:
Viktor Barzin
parent
07bd2e0017
commit
445feb118f
5 changed files with 484 additions and 419 deletions
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@ -135,6 +135,22 @@ variable "hostpci0" {
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default = "" # e.g., "0000:06:00.0" for Tesla T4 passthrough
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}
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# ---------------------------------------------------------------------------
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# Variables — Disk I/O throttling (bytes/sec; 0 = uncapped)
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# ---------------------------------------------------------------------------
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# Caps any single VM's share of the underlying disk so a runaway workload
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# (e.g. the 2026-05-23/26 alloy IO storm — memory id=2726) cannot wedge the
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# whole Proxmox host's sdc thin pool. Values inferred from PVE RRD p99/max
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# observed in /nodes/pve/qemu/<vmid>/rrddata.
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variable "mbps_rd" {
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type = number
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default = 0
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}
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variable "mbps_wr" {
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type = number
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default = 0
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}
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# ---------------------------------------------------------------------------
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# Resource
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# ---------------------------------------------------------------------------
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@ -192,9 +208,11 @@ resource "proxmox_vm_qemu" "cloudinit-vm" {
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for_each = var.disk_slot == "scsi0" ? [1] : []
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content {
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disk {
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storage = "local-lvm"
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size = var.vm_disk_size
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discard = true # Enable TRIM passthrough to LVM thin pool — reduces CoW overhead
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storage = "local-lvm"
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size = var.vm_disk_size
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discard = true # Enable TRIM passthrough to LVM thin pool — reduces CoW overhead
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mbps_r_concurrent = var.mbps_rd
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mbps_wr_concurrent = var.mbps_wr
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}
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}
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}
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@ -202,9 +220,11 @@ resource "proxmox_vm_qemu" "cloudinit-vm" {
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for_each = var.disk_slot == "scsi1" ? [1] : []
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content {
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disk {
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storage = "local-lvm"
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size = var.vm_disk_size
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discard = true
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storage = "local-lvm"
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size = var.vm_disk_size
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discard = true
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mbps_r_concurrent = var.mbps_rd
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mbps_wr_concurrent = var.mbps_wr
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}
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}
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}
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@ -234,12 +254,39 @@ resource "proxmox_vm_qemu" "cloudinit-vm" {
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lifecycle {
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prevent_destroy = true
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ignore_changes = [
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# democratic-csi dynamically attaches/detaches iSCSI disks
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# proxmox-csi dynamically attaches/detaches PVC disks. K8s workers
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# have up to ~30 slots in use simultaneously (k8s-node1: scsi1-29 +
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# unused0-29). The k8s-master only uses scsi0 (boot) so most of
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# these are no-ops for that VM but harmless.
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disks[0].scsi[0].scsi1,
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disks[0].scsi[0].scsi2,
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disks[0].scsi[0].scsi3,
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disks[0].scsi[0].scsi4,
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disks[0].scsi[0].scsi5,
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disks[0].scsi[0].scsi6,
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disks[0].scsi[0].scsi7,
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disks[0].scsi[0].scsi8,
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disks[0].scsi[0].scsi9,
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disks[0].scsi[0].scsi10,
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disks[0].scsi[0].scsi11,
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disks[0].scsi[0].scsi12,
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disks[0].scsi[0].scsi13,
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disks[0].scsi[0].scsi14,
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disks[0].scsi[0].scsi15,
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disks[0].scsi[0].scsi16,
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disks[0].scsi[0].scsi17,
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disks[0].scsi[0].scsi18,
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disks[0].scsi[0].scsi19,
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disks[0].scsi[0].scsi20,
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disks[0].scsi[0].scsi21,
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disks[0].scsi[0].scsi22,
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disks[0].scsi[0].scsi23,
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disks[0].scsi[0].scsi24,
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disks[0].scsi[0].scsi25,
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disks[0].scsi[0].scsi26,
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disks[0].scsi[0].scsi27,
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disks[0].scsi[0].scsi28,
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disks[0].scsi[0].scsi29,
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# cloud-init config may drift after first boot
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cicustom,
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ciupgrade,
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@ -254,6 +301,13 @@ resource "proxmox_vm_qemu" "cloudinit-vm" {
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# Provider defaults that differ from imported state
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define_connection_info,
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full_clone,
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# scsihw varies per VM (virtio-scsi-pci / virtio-scsi-single / lsi)
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# and changing it on a running VM is risky — leave whatever's live.
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scsihw,
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# qemu_os is a hint to qemu about the guest OS; some live VMs have
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# "other" (unset originally) and the module's "l26" default would
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# otherwise force an unnecessary write on apply.
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qemu_os,
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]
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}
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}
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