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Hetzner: cpx (new gen) defaults + capacity-aware placement #166

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Hetzner: cpx (new gen) defaults + capacity-aware placement #166

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69d5cca
swap default Hetzner sizes from cax (ARM) to cpx (AMD)
barnabasbusa May 6, 2026
32db548
swap to cx (new gen) instead of cpx (legacy)
barnabasbusa May 6, 2026
37b8904
add capacity-aware placement, swap defaults to cpx (new gen)
barnabasbusa May 6, 2026
942232a
note SKU rationale in comment
barnabasbusa May 6, 2026
29f3216
revert: drop SKU rationale comment, moved to PR description
barnabasbusa May 6, 2026
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45 changes: 41 additions & 4 deletions terraform/devnet-0/hetzner.tf
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Original file line number Diff line number Diff line change
Expand Up @@ -8,12 +8,12 @@ variable "hcloud_ssh_key_fingerprint" {

variable "hetzner_supernode_size" {
type = string
default = "cax41"
default = "cpx62"
}

variable "hetzner_fullnode_size" {
type = string
default = "cax31"
default = "cpx42"
}

variable "hetzner_regions" {
Expand All @@ -24,12 +24,45 @@ variable "hetzner_regions" {
]
}

////////////////////////////////////////////////////////////////////////////////////////
// DATA SOURCES
////////////////////////////////////////////////////////////////////////////////////////
data "hcloud_server_type" "supernode" {
count = local.hetzner_has_servers ? 1 : 0
name = var.hetzner_supernode_size
}

data "hcloud_server_type" "fullnode" {
count = local.hetzner_has_servers ? 1 : 0
name = var.hetzner_fullnode_size
}

data "hcloud_datacenters" "all" {
count = local.hetzner_has_servers ? 1 : 0
}

////////////////////////////////////////////////////////////////////////////////////////
// LOCALS
////////////////////////////////////////////////////////////////////////////////////////
locals {
hetzner_has_servers = length(local.hetzner_nodes) > 0

required_hetzner_server_type_ids = local.hetzner_has_servers ? toset([
tostring(data.hcloud_server_type.supernode[0].id),
tostring(data.hcloud_server_type.fullnode[0].id),
]) : toset([])

hetzner_available_locations = local.hetzner_has_servers ? distinct([
for dc in data.hcloud_datacenters.all[0].datacenters : dc.location.name
if alltrue([for tid in local.required_hetzner_server_type_ids : contains([for id in dc.available_server_type_ids : tostring(id)], tid)])
]) : []

hetzner_regions_filtered = [
for r in var.hetzner_regions : r if contains(local.hetzner_available_locations, r)
]

hetzner_regions_effective = length(local.hetzner_regions_filtered) > 0 ? local.hetzner_regions_filtered : var.hetzner_regions

hetzner_network = {
for region in var.hetzner_regions : region => {
name = "${var.ethereum_network}-${region}"
Expand Down Expand Up @@ -76,7 +109,7 @@ locals {
) ? var.hetzner_supernode_size : var.hetzner_fullnode_size
)

location = node.location != null ? node.location : var.hetzner_regions[i % length(var.hetzner_regions)]
location = node.location != null ? node.location : local.hetzner_regions_effective[i % length(local.hetzner_regions_effective)]
ipv4_enabled = node.ipv4_enabled
ipv6_enabled = node.ipv6_enabled
}
Expand Down Expand Up @@ -166,12 +199,16 @@ resource "hcloud_server" "main" {
ipv4_enabled = each.value.ipv4_enabled
ipv6_enabled = each.value.ipv6_enabled
}

lifecycle {
ignore_changes = [location]
}
}

resource "hcloud_server_network" "main" {
for_each = {
for vm in local.hcloud_vms : vm.id => vm
}
server_id = hcloud_server.main[each.key].id
network_id = hcloud_network.main[each.value.location].id
network_id = hcloud_network.main[hcloud_server.main[each.key].location].id
}