Migrate Flatcar Linux from Ignition spec v2.3.0 to v3.3.0

* Requires poseidon v0.11+ and Flatcar Linux 3185.0.0+ (action required)
* Previously, Flatcar Linux configs have been parsed as Container
Linux Configs to Ignition v2.2.0 specs by poseidon/ct
* Flatcar Linux starting in 3185.0.0 now supports Ignition v3.x specs
(which are rendered from Butane Configs, like Fedora CoreOS)
* poseidon/ct v0.11.0 adds support for the flatcar Butane Config
variant so that Flatcar Linux can use Ignition v3.x

Rel:

* [Flatcar Support](https://flatcar-linux.org/docs/latest/provisioning/ignition/specification/#ignition-v3)
* [poseidon/ct support](https://github.com/poseidon/terraform-provider-ct/pull/131)

digital-ocean/flatcar-linux/kubernetes/butane/controller.yaml

@@ -1,4 +1,5 @@
----
+variant: flatcar
+version: 1.0.0
 systemd:
   units:
     - name: etcd-member.service
@@ -142,15 +143,12 @@ systemd:
 storage:
   directories:
     - path: /var/lib/etcd
-      filesystem: root
       mode: 0700
       overwrite: true
     - path: /etc/kubernetes
-      filesystem: root
       mode: 0755
   files:
     - path: /opt/bootstrap/layout
-      filesystem: root
       mode: 0544
       contents:
         inline: |
@@ -173,7 +171,6 @@ storage:
           mv manifests-networking/* /opt/bootstrap/assets/manifests/
           rm -rf assets auth static-manifests tls manifests-networking
     - path: /opt/bootstrap/apply
-      filesystem: root
       mode: 0544
       contents:
         inline: |
@@ -188,13 +185,11 @@ storage:
              sleep 5
           done
     - path: /etc/sysctl.d/max-user-watches.conf
-      filesystem: root
       mode: 0644
       contents:
         inline: |
           fs.inotify.max_user_watches=16184
     - path: /etc/etcd/etcd.env
-      filesystem: root
       mode: 0644
       contents:
           inline: |

digital-ocean/flatcar-linux/kubernetes/butane/worker.yaml

@@ -1,4 +1,5 @@
----
+variant: flatcar
+version: 1.0.0
 systemd:
   units:
     - name: docker.service
@@ -108,11 +109,9 @@ systemd:
 storage:
   directories:
     - path: /etc/kubernetes
-      filesystem: root
       mode: 0755
   files:
     - path: /etc/sysctl.d/max-user-watches.conf
-      filesystem: root
       mode: 0644
       contents:
         inline: |

digital-ocean/flatcar-linux/kubernetes/controllers.tf

@@ -70,7 +70,7 @@ resource "digitalocean_tag" "controllers" {
 # Flatcar Linux controllers
 data "ct_config" "controllers" {
   count = var.controller_count
-  content = templatefile("${path.module}/cl/controller.yaml", {
+  content = templatefile("${path.module}/butane/controller.yaml", {
     # Cannot use cyclic dependencies on controllers or their DNS records
     etcd_name   = "etcd${count.index}"
     etcd_domain = "${var.cluster_name}-etcd${count.index}.${var.dns_zone}"

digital-ocean/flatcar-linux/kubernetes/versions.tf

@@ -6,7 +6,7 @@ terraform {
     null = ">= 2.1"
     ct = {
       source  = "poseidon/ct"
-      version = "~> 0.9"
+      version = "~> 0.11"
     }
     digitalocean = {
       source  = "digitalocean/digitalocean"

digital-ocean/flatcar-linux/kubernetes/workers.tf

@@ -58,7 +58,7 @@ resource "digitalocean_tag" "workers" {
 
 # Flatcar Linux worker
 data "ct_config" "worker" {
-  content = templatefile("${path.module}/cl/worker.yaml", {
+  content = templatefile("${path.module}/butane/worker.yaml", {
     cluster_dns_service_ip = cidrhost(var.service_cidr, 10)
     cluster_domain_suffix  = var.cluster_domain_suffix
   })