infra(tofu): docs + example for the Proxmox migration
Update tofu README (Proxmox targets table, operator prerequisites: enable Snippets content on `local`, endpoint scheme fix, pfSense NAT), terraform.tfvars.example (Proxmox vars + env-only auth, token never a tofu var), and the devcontainer versions.env provider note. Co-Authored-By: Claude Opus 4.8 <[email protected]>
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@@ -1,39 +1,69 @@
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# infra/tofu — dev/test cluster nodes (OpenTofu + libvirt)
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# infra/tofu — dev/test cluster nodes (OpenTofu + Proxmox VE)
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Phase 1 **T-1.1**. Provisions the "Create" lifecycle stage (docs/02): a dedicated
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NAT network and 3 cloud-init'd KVM VMs, each with a thin OS disk and a blank thin
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Longhorn data disk. **Authoring only — nothing here has been applied.**
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Provisions the "Create" lifecycle stage (docs/02): 3 cloud-init'd VMs on the
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**Proxmox VE** box, each with an imported OS disk and a blank Longhorn data disk.
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**Authoring only — nothing here has been applied.** (Migrated from the old
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memory-constrained libvirt host; provider is now `bpg/proxmox`.)
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Serves **R-ENV-01/02**, **R-PLAT-01**, ADR-0001 (k3s substrate), and the network
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half of the LOCKED PHASE1-SCOPE decisions.
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Serves **R-ENV-01/02**, **R-PLAT-01**, ADR-0001 (k3s substrate).
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## What it builds (defaults = LOCKED decisions)
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## What it builds (defaults = VERIFIED Proxmox targets)
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| Resource | Value |
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|---|---|
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| NAT network | `k3s-dev`, `10.73.0.0/24`, gateway `10.73.0.1`, **DHCP off** (static IPs) |
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| Nodes | `k3s-dev-1/2/3` at `10.73.0.11/.12/.13` |
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| Per node | 4 vCPU, 6 GiB RAM, **host-passthrough** CPU (nested virt for KubeVirt) |
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| OS disk | 20 GiB thin qcow2, backed by the base cloud image |
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| Data disk | 40 GiB blank thin qcow2 → `/dev/vdb`, mounted at `/var/lib/longhorn` by cloud-init |
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| Seed | `libvirt_cloudinit_disk` wired to `../cloud-init/` templates |
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| Reserved | `10.73.0.240–.250` kept out of any DHCP range for Cilium L2 ingress VIPs |
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| Proxmox node | `proxmox` |
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| Disk datastore | `Storage` (ZFS, 4.3TB) |
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| Image/snippet datastore | `local` (dir; content = iso + **snippets**) |
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| Bridge | `vmbr0` (no VLAN) |
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| Nodes | `k3s-dev-1/2/3` at `192.168.1.50/.51/.52`, gw `192.168.1.1`, DNS `192.168.1.18` |
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| Per node | 6 vCPU, 16 GiB RAM, **cpu type `host`** (nested virt for KubeVirt) |
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| OS disk | 40 GiB, virtio0 (`/dev/vda`, boot), imported from the Debian 12 cloud image |
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| Data disk | 100 GiB, virtio1 (`/dev/vdb`) → `/var/lib/longhorn` (mounted by cloud-init) |
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| Cloud-init | native `initialization` (static IP + DNS) + user-data **snippet** for the baseline |
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| Reserved | `192.168.1.53–.60` for Cilium L2 ingress VIPs (surfaced in outputs) |
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Base OS image is a **variable** (`image_source`), defaulting to Debian 12
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genericcloud amd64. All sizing/IPs/counts are variables — see `variables.tf`.
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All sizing/IPs/counts/placement are variables — see `variables.tf`.
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## Files
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- `versions.tf` — OpenTofu `1.9.0` pin + `dmacvicar/libvirt ~> 0.8.1` provider pin.
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- `variables.tf` — every knob (counts, sizing, IPs, image, SSH key).
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- `main.tf` — network, base/OS/data volumes, cloud-init seed, domains.
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- `outputs.tf` — node IPs/names, `primary_node_ip`, `k3s_api_endpoint`, and a
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rendered `ansible_inventory` for `infra/ansible/`.
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- `terraform.tfvars.example` — copy to `terraform.tfvars`; only `ssh_authorized_key` is required.
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- `versions.tf` — OpenTofu `1.9.0` pin + `bpg/proxmox ~> 0.66`; provider block with
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endpoint scheme-normalization (see below).
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- `variables.tf` — every knob (Proxmox placement, counts, sizing, IPs, image, SSH key).
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- `main.tf` — cloud image download, per-node user-data snippet, and the 3 VMs.
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- `outputs.tf` — node IPs/names, `primary_node_ip`, `k3s_api_endpoint`, rendered
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`ansible_inventory`.
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- `terraform.tfvars.example` — copy to `terraform.tfvars`; only `ssh_authorized_key` required.
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## Usage (operator, in the dev container — NOT run here)
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## Operator prerequisites (before `tofu apply`)
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1. **Enable `snippets` content on the `local` datastore.** The rich first-boot
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baseline (users, packages, kernel modules, Longhorn mount, swap-off) is shipped
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as a cloud-init user-data snippet. In the Proxmox UI: *Datacenter → Storage →
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`local` → Edit → Content → add **Snippets***. Without this the
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`proxmox_virtual_environment_file` (user-data) resource fails. (Alternatively
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point `image_datastore` at any datastore that has snippets enabled.)
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2. **Endpoint scheme.** If the operator env file exports `PROXMOX_VE_ENDPOINT`
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without `https://`, the provider talks HTTP and eats a 301. Either fix the env
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file to include the scheme, or export `TF_VAR_proxmox_endpoint="$PROXMOX_VE_ENDPOINT"`
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so tofu normalizes it (prepends `https://`).
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3. **pfSense SSH NAT** (network-dependent): the PM reaches these nodes and the k3s
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API over a pfSense NAT that is not yet created; the Ansible inventory carries a
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note to finalize `ansible_host` once the NAT rule exists.
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## Auth (env only — never in tofu vars/state)
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The provider reads these from the environment; the **API token is never a tofu
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variable**, so it never enters state, vars, or plan output:
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```
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export PROXMOX_VE_ENDPOINT="https://192.168.2.102:8006/"
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export PROXMOX_VE_API_TOKEN="user@realm!tokenid=SECRET"
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export PROXMOX_VE_INSECURE="true"
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export TF_VAR_proxmox_endpoint="$PROXMOX_VE_ENDPOINT" # optional; enables normalization
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```
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## Usage (operator — NOT run here)
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```
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cd infra/tofu
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cp terraform.tfvars.example terraform.tfvars # set ssh_authorized_key
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# source the operator env file (exports the PROXMOX_VE_* above)
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tofu init
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tofu plan
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tofu apply
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@@ -42,16 +72,17 @@ tofu output -raw ansible_inventory > ../ansible/inventory/hosts.ini
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```
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## Hand-off contract
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- `primary_node_ip` / `k3s_api_endpoint` (`10.73.0.11:6443`) is the value the
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Ansible Cilium bootstrap and the Flux `platform/cilium` HelmRelease must BOTH
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use for `k8sServiceHost` / `k8sServicePort` (docs/02 parity contract).
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- Destroy/rebuild proof (T-1.5): `tofu destroy -target=libvirt_domain.node[1]`
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then `tofu apply` re-creates that node; Ansible re-joins it; Longhorn replicas
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reconverge (nodes are cattle — docs/02 statelessness).
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- `primary_node_ip` / `k3s_api_endpoint` (`192.168.1.50:6443`) is the value the
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Ansible Cilium bootstrap and the Flux `platform/cilium` HelmRelease must BOTH use
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for `k8sServiceHost` / `k8sServicePort` (docs/02 parity contract).
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- Destroy/rebuild proof: name-keyed `for_each` means
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`tofu destroy -target='proxmox_virtual_environment_vm.node["k3s-dev-2"]'` then
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`tofu apply` re-creates just that node (`stop_on_destroy` allows the clean stop);
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Ansible re-joins it; Longhorn replicas reconverge (nodes are cattle).
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## Static validation (PM, in dev container)
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## Static validation (PM, offline)
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```
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tofu fmt -check -recursive
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tofu init -backend=false
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tofu init # fetches the bpg provider (network, read-only)
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tofu validate
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```
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