thermograph/terraform/modules/thermograph-host/variables.tf
Emi Griffith e5137e777d Have Terraform generate its own internal secrets, with sizing tiers (#239)
Terraform generates the secrets that have no external meaning
(POSTGRES_PASSWORD, AUTH_SECRET, METRICS_TOKEN, INDEXNOW_KEY) via the random
provider instead of requiring the operator to hand-generate and paste each
into terraform.tfvars. Each is pinned with a static keepers value (secrets.tf)
so apply never regenerates a value already in use - the exact incident class
this guards against: every session invalidated, the app<->DB password
mismatched. Rotation is now a deliberate keepers edit, never a side effect.

postgres_password/auth_secret move from required inputs to optional (default
"") - explicit var wins when supplied (seeding an EXISTING live secret during
a migration onto Terraform, hop-1 cutover runbook Stage 0), else Terraform
generates and owns it. metrics_token/indexnow_key are new: neither existed in
Terraform before, both previously left for the app's own fallback generation.

VAPID deliberately stays a required, non-generated input - an EC keypair
where regeneration breaks every existing push subscription outright, unlike
an opaque token.

Sizing tiers: a locals.sizes t-shirt map (nano/small/medium/large ->
{workers, app_cpus, db_cpus, db_memory}), toward the target Proxmox
sizing-tier model (architecture doc SS6) ahead of actually provisioning VMs -
Proxmox itself stays deferred; today a tier just sizes container caps on the
existing SSH-managed hosts. A host can reference one by name (hosts.<name>.
size) or keep hand-picking the four fields, so existing tfvars are
unaffected; prod's example now uses size = "large" (identical numbers),
beta keeps explicit numbers, and a commented uat example demonstrates the
shortcut for a future ephemeral host.

Strengthened terraform/README.md's local-state caveat: more Terraform-
generated secrets landing in tfstate raises the stakes of the existing
never-commit-cleartext-state guidance, not just the sizing.

Verified: terraform validate + fmt clean. A real `terraform plan` against
fake hosts (prod/beta/uat, mixing size="large"/explicit-numbers/size="nano")
resolved every sizing correctly (prod 8/8/4/16g, beta 4/4/2/8g, uat
1/1/1/1g) and planned exactly one instance of each random_password/random_id
resource. Applied just those four resources (real generation, -target to
avoid touching the fake SSH-only host resources) and re-planned: "No
changes" - confirming the keepers pinning holds. Adding an explicit
postgres_password override afterward left the random_password resource
itself completely untouched (0 replace/destroy), confirming the override
path never disturbs the generated resource.
2026-07-21 01:08:57 +00:00

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HCL

# Per-host inputs (all supplied by the root module's for_each).
variable "name" {
description = "Short host key (e.g. \"prod\", \"dev\"), used in log lines."
type = string
}
variable "host" {
description = "IP or hostname to SSH to."
type = string
}
variable "ssh_user" {
description = "SSH login user (must be able to sudo)."
type = string
}
variable "ssh_private_key_path" {
description = "Path to the private key file for ssh_user."
type = string
}
variable "role" {
description = "\"prod\" | \"dev\" — informational."
type = string
}
variable "git_branch" {
description = "Branch the host checkout is reset to."
type = string
}
variable "domain" {
description = "Public domain. \"\" => no Caddy/TLS (open the app port instead)."
type = string
}
variable "compose_files" {
description = "Compose files to layer, in order (dev appends docker-compose.dev.yml)."
type = list(string)
}
variable "openmeteo" {
description = "Self-host the ERA5 archive: layer docker-compose.openmeteo.yml + provision the host rclone mount."
type = bool
default = false
}
variable "om_data_dir" {
description = "Host rclone mount point for the archive bucket (OM_DATA_DIR the overlay bind-mounts)."
type = string
default = "/mnt/om-archive"
}
variable "om_bucket_remote" {
description = "rclone remote:path for the archive bucket (mounted at om_data_dir)."
type = string
default = ""
}
variable "om_rclone_conf" {
description = "rclone.conf contents installed to /etc/rclone/rclone.conf. Sensitive."
type = string
default = ""
sensitive = true
}
variable "om_vfs_cache_max" {
description = "rclone --vfs-cache-max-size for the mount's on-disk hot cache."
type = string
default = "80G"
}
variable "app_dir" {
description = "Checkout path on the host."
type = string
}
variable "repo_root" {
description = "Local repo root, used to hash the compose files for the re-apply trigger."
type = string
}
variable "repo_url" {
description = "Git remote to clone from if the host has no checkout yet."
type = string
}
variable "app_port" {
description = "Port the app binds / is health-checked on."
type = number
}
# ---- Sizing -------------------------------------------------------------------
variable "workers" {
description = "uvicorn worker count (WORKERS)."
type = number
}
variable "app_cpus" {
description = "App container CPU cap (APP_CPUS)."
type = number
}
variable "db_cpus" {
description = "DB container CPU cap (DB_CPUS)."
type = number
}
variable "db_memory" {
description = "DB container memory cap (DB_MEMORY), e.g. \"8g\"."
type = string
}
variable "timescaledb_tag" {
description = "TimescaleDB image tag (TIMESCALEDB_TAG), e.g. \"2.17.2-pg18\". \"latest-pg18\" (the default) matches today's behavior; pin an exact minor before any host could ever replicate with another."
type = string
default = "latest-pg18"
}
# ---- Secrets rendered into /etc/thermograph.env -------------------------------
variable "postgres_password" {
type = string
sensitive = true
}
variable "auth_secret" {
type = string
sensitive = true
}
variable "metrics_token" {
type = string
sensitive = true
default = ""
}
variable "indexnow_key" {
type = string
sensitive = true
default = ""
}
variable "vapid_private_key" {
type = string
sensitive = true
}
variable "vapid_public_key" {
type = string
sensitive = true
}
variable "vapid_contact" {
type = string
sensitive = true
}
variable "google_verify" {
type = string
sensitive = true
}
variable "bing_verify" {
type = string
sensitive = true
}
variable "mail_backend" {
type = string
}
variable "smtp_host" {
type = string
}
variable "smtp_port" {
type = string
}
variable "smtp_user" {
type = string
sensitive = true
}
variable "smtp_password" {
type = string
sensitive = true
}
variable "smtp_starttls" {
type = string
}
variable "mail_from" {
type = string
}
variable "mail_reply_to" {
type = string
}
variable "discord_webhook" {
type = string
sensitive = true
}
variable "discord_public_key" {
type = string
}
variable "discord_app_id" {
type = string
}
variable "discord_bot_token" {
type = string
sensitive = true
}
variable "discord_client_secret" {
type = string
sensitive = true
}