typhoon/bare-metal/flatcar-linux/kubernetes/worker/matchbox.tf

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Restructure bare-metal module to use a worker submodule * Add an internal `worker` module to the bare-metal module, to allow individual bare-metal machines to be defined and joined to an existing bare-metal cluster. This is similar to the "worker pools" modules for adding sets of nodes to cloud (AWS, GCP, Azure) clusters, but on metal, each piece of hardware is potentially unique New: Using the new `worker` module, a Kubernetes cluster can be defined without any `workers` (i.e. just a control-plane). Use the `worker` module to define each piece machine that should join the bare-metal cluster and customize it in detail. This style is quite flexible and suited for clusters with hardware that varies quite a bit. ```tf module "mercury" { source = "git::https://github.com/poseidon/typhoon//bare-metal/flatcar-linux/kubernetes?ref=v1.26.2" # bare-metal cluster_name = "mercury" matchbox_http_endpoint = "http://matchbox.example.com" os_channel = "flatcar-stable" os_version = "2345.3.1" # configuration k8s_domain_name = "node1.example.com" ssh_authorized_key = "ssh-rsa AAAAB3Nz..." # machines controllers = [{ name = "node1" mac = "52:54:00:a1:9c:ae" domain = "node1.example.com" }] } ``` ```tf module "mercury-node1" { source = "git::https://github.com/poseidon/typhoon//bare-metal/flatcar-linux/kubernetes/worker?ref=v1.26.2" cluster_name = "mercury" # bare-metal matchbox_http_endpoint = "http://matchbox.example.com" os_channel = "flatcar-stable" os_version = "2345.3.1" # configuration name = "node2" mac = "52:54:00:b2:2f:86" domain = "node2.example.com" kubeconfig = module.mercury.kubeconfig ssh_authorized_key = "ssh-rsa AAAAB3Nz..." # optional snippets = [] node_labels = [] node_tains = [] install_disk = "/dev/vda" cached_install = false } ``` For clusters with fairly similar hardware, you may continue to define `workers` directly within the cluster definition. This reduces some repetition, but is not quite as flexible. ```tf module "mercury" { source = "git::https://github.com/poseidon/typhoon//bare-metal/flatcar-linux/kubernetes?ref=v1.26.1" # bare-metal cluster_name = "mercury" matchbox_http_endpoint = "http://matchbox.example.com" os_channel = "flatcar-stable" os_version = "2345.3.1" # configuration k8s_domain_name = "node1.example.com" ssh_authorized_key = "ssh-rsa AAAAB3Nz..." # machines controllers = [{ name = "node1" mac = "52:54:00:a1:9c:ae" domain = "node1.example.com" }] workers = [ { name = "node2", mac = "52:54:00:b2:2f:86" domain = "node2.example.com" }, { name = "node3", mac = "52:54:00:c3:61:77" domain = "node3.example.com" } ] } ``` Optional variables `snippets`, `worker_node_labels`, and `worker_node_taints` are still defined as a map from machine name to a list of snippets, labels, or taints respectively to allow some degree of per-machine customization. However, fields like `install_disk`, `kernel_args`, `cached_install` and future options will not be designed this way. Instead, if your machines vary it is recommended to use the new `worker` module to define each node
2023-01-25 05:37:57 +01:00
locals {
# flatcar-stable -> stable channel
channel = split("-", var.os_channel)[1]
remote_kernel = "${var.download_protocol}://${local.channel}.release.flatcar-linux.net/amd64-usr/${var.os_version}/flatcar_production_pxe.vmlinuz"
remote_initrd = [
"${var.download_protocol}://${local.channel}.release.flatcar-linux.net/amd64-usr/${var.os_version}/flatcar_production_pxe_image.cpio.gz",
]
args = flatten([
"initrd=flatcar_production_pxe_image.cpio.gz",
"flatcar.config.url=${var.matchbox_http_endpoint}/ignition?uuid=$${uuid}&mac=$${mac:hexhyp}",
"flatcar.first_boot=yes",
var.kernel_args,
])
cached_kernel = "/assets/flatcar/${var.os_version}/flatcar_production_pxe.vmlinuz"
cached_initrd = [
"/assets/flatcar/${var.os_version}/flatcar_production_pxe_image.cpio.gz",
]
kernel = var.cached_install ? local.cached_kernel : local.remote_kernel
initrd = var.cached_install ? local.cached_initrd : local.remote_initrd
}
# Match machine to an install profile by MAC
resource "matchbox_group" "install" {
name = format("install-%s", var.name)
profile = matchbox_profile.install.name
selector = {
mac = var.mac
}
}
// Flatcar Linux install profile (from release.flatcar-linux.net)
resource "matchbox_profile" "install" {
name = format("%s-install-%s", var.cluster_name, var.name)
kernel = local.kernel
initrd = local.initrd
args = concat(local.args, var.kernel_args)
raw_ignition = data.ct_config.install.rendered
}
# Flatcar Linux install
data "ct_config" "install" {
content = templatefile("${path.module}/butane/install.yaml", {
os_channel = local.channel
os_version = var.os_version
ignition_endpoint = format("%s/ignition", var.matchbox_http_endpoint)
mac = var.mac
install_disk = var.install_disk
ssh_authorized_key = var.ssh_authorized_key
# only cached profile adds -b baseurl
baseurl_flag = var.cached_install ? "-b ${var.matchbox_http_endpoint}/assets/flatcar" : ""
})
strict = true
}
# Match a worker to a profile by MAC
resource "matchbox_group" "worker" {
name = format("%s-%s", var.cluster_name, var.name)
profile = matchbox_profile.worker.name
selector = {
mac = var.mac
os = "installed"
}
}
// Flatcar Linux Worker profile
resource "matchbox_profile" "worker" {
name = format("%s-worker-%s", var.cluster_name, var.name)
raw_ignition = data.ct_config.worker.rendered
}
# Flatcar Linux workers
data "ct_config" "worker" {
content = templatefile("${path.module}/butane/worker.yaml", {
domain_name = var.domain
ssh_authorized_key = var.ssh_authorized_key
cluster_dns_service_ip = cidrhost(var.service_cidr, 10)
cluster_domain_suffix = var.cluster_domain_suffix
node_labels = join(",", var.node_labels)
node_taints = join(",", var.node_taints)
})
strict = true
snippets = var.snippets
}