add kubernetes cluster sample

kubernetes-cluster/README.md

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+# Kubernetes Cluster Example
+
+This example uses the triton and ansible terraform providers to create a Kubernetes cluster.
+
+The initial version is able to create a single type of node, a mixed control plane, etcd and worker node.
+
+This is ideal for PoC (single node) or small scale clusters with collocated control and worker functions (3 nodes).

kubernetes-cluster/credentials.tf

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+provider "triton" {
+  account = var.spearhead_account
+  key_id  = var.spearhead_key_id
+  key_material = var.spearhead_key_material
+
+  # If using a private installation of Triton, specify the URL, otherwise
+  # set the URL according to the region you wish to provision.
+  url = "https://eu-ro-1.api.spearhead.cloud"
+
+  # If using a test Triton installation (self-signed certifcate), use:
+  insecure_skip_tls_verify = false
+}
+
+provider "ansible" {
+}

kubernetes-cluster/data.tf

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+data "template_file" "cloud_init" {
+  template = file("${path.module}/templates/cloud-init.yml")
+}

kubernetes-cluster/firewall.tf

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+resource "triton_firewall_rule" "allow_ssh" {
+  description = "Allow ssh traffic on port tcp/22 to all machines."
+  rule        = "FROM any TO all vms ALLOW tcp PORT 22"
+  enabled     = true
+}
+
+resource "triton_firewall_rule" "allow_http" {
+  description = "Allow http traffic on port tcp/80 to all machines."
+  rule        = "FROM any TO tag \"kube_node\" ALLOW tcp PORT 80"
+  enabled     = true
+}
+
+resource "triton_firewall_rule" "allow_https" {
+  description = "Allow https traffic on port tcp/443 to all machines."
+  rule        = "FROM any TO tag \"kube_node\" ALLOW tcp PORT 443"
+  enabled     = true
+}
+
+resource "triton_firewall_rule" "allow_kube_proxy" {
+  description = "Allow kube_proxy traffic on port tcp/10250 to all machines."
+  rule        = "FROM any TO tag \"kube_node\" ALLOW tcp PORT 10250"
+  enabled     = true
+}
+
+resource "triton_firewall_rule" "allow_kube_api" {
+  description = "Allow kube-api traffic on port tcp/6443 to all kube_node machines."
+  rule        = "FROM any TO all vms ALLOW tcp PORT 6443"
+  enabled     = true
+}
+
+
+# resource "triton_firewall_rule" "allow_etcd_api" {
+#   description = "Allow kube-api traffic on port tcp/2380 to all kube_node machines."
+#   rule        = "FROM any TO tag \"kube_node\" ALLOW tcp PORT 2380"
+#   enabled     = true
+# }
+
+# resource "triton_firewall_rule" "allow_etcd_api_2" {
+#   description = "Allow kube-api traffic on port tcp/2379 to all kube_node machines."
+#   rule        = "FROM any TO tag \"kube_node\" ALLOW tcp PORT 2379"
+#   enabled     = true
+# }
+
+# resource "triton_firewall_rule" "allow_calico_vxlan" {
+#   description = "Allow vxlan traffic on port udp/47809 to all kube_node machines."
+#   rule        = "FROM tag \"kube_node\" TO tag \"kube_node\" ALLOW udp PORT 4789"
+#   enabled     = true
+#}
+
+resource "triton_firewall_rule" "allow_internal_udp" {
+  description = "Allow udp internal traffic between all kube_node machines."
+  rule        = "FROM tag \"kube_node\" TO tag \"kube_node\" ALLOW udp PORT all"
+  enabled     = true
+}
+
+resource "triton_firewall_rule" "allow_internal_tcp" {
+  description = "Allow tcp internal traffic between all kube_node machines."
+  rule        = "FROM tag \"kube_node\" TO tag \"kube_node\" ALLOW tcp PORT all"
+  enabled     = true
+}
+
+resource "triton_firewall_rule" "allow_internal_icmp" {
+  description = "Allow icmp internal traffic between all kube_node machines."
+  rule        = "FROM tag \"kube_node\" TO tag \"kube_node\" ALLOW icmp TYPE 8 CODE 0"
+  enabled     = true
+}
+

kubernetes-cluster/instances.tf

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+resource "triton_machine" "kube_nodes" {
+  count                = var.number_of_kube_nodes
+  name                 = format("kube-node-%s", count.index)
+  package              = "hvm-2cpu-4ram-100disk"
+  image                = "${data.triton_image.base_image.id}"
+  firewall_enabled     = true
+
+  cloud_config = data.template_file.cloud_init.rendered
+
+  tags = {
+    kube_node = "true"
+  }
+
+  cns {
+    services = ["kube-api", "ghost-blog"]
+  }
+
+  affinity = ["kube_node!=~true"]
+}
+
+resource "ansible_host" "kube_nodes" {
+  count              = var.number_of_kube_nodes
+  inventory_hostname = element(resource.triton_machine.kube_nodes.*.name, count.index)
+  groups             = [ "kube_control_plane", "kube_node", "etcd" ]
+
+  vars               = {
+    ansible_user     = "ubuntu"
+    ansible_ssh_host = element(resource.triton_machine.kube_nodes.*.primaryip, count.index)
+    ip               = element(element(resource.triton_machine.kube_nodes.*.ips, count.index), 1)
+  }
+}
+
+resource "ansible_group" "k8s_cluster" {
+  inventory_group_name = "k8s_cluster"
+  children = [ "kube_control_plane", "kube_node", "etcd" ]
+}

kubernetes-cluster/providers.tf

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+terraform {
+  required_providers {
+    triton = {
+      source = "joyent/triton"
+      version = "0.8.2"
+    }
+    ansible = {
+      source = "nbering/ansible"
+      version = "1.0.4"
+    }
+  }
+}

kubernetes-cluster/resources.tf

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+data "triton_image" "base_image" {
+  name    =  var.image_name
+  # "ubuntu-20.04.04"
+  version =  var.image_version
+  "20220405.02"
+}

kubernetes-cluster/templates/cloud-init.yml

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+#cloud-config
+package_update: true
+package_upgrade: true
+swap:
+bootcmd:
+  - swapoff -a
+  - growpart /dev/vda 3
+  - pvresize /dev/vda3
+  - lvcreate ubuntu-vg -n longhorn-lv -L 40G
+  - mkfs -t ext4 /dev/ubuntu-vg/longhorn-lv
+mounts:
+  - [ /dev/ubuntu-vg/longhorn-lv, /var/lib/longhorn, ext4, defaults, 0, 0 ]

kubernetes-cluster/variables.tf

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+variable "spearhead_account" {
+	description = "Spearhead Account Name"
+   	type = string
+}
+
+variable "spearhead_key_id" {
+	description = "Spearhead Key Id (ssh fingerprint)"
+   	type = string
+}
+
+variable "spearhead_key_material" {
+	description = "Spearhead Key Material (location of ssh key file)"
+   	type = string
+}
+
+variable "image_name" {
+	description = "Spearhead Cloud Image Name"
+   	type = string
+    default = "ubuntu-20.04.04"
+} 
+
+variable "image_version" {
+	description = "Spearhead Cloud Image Version"
+   	type = string
+    default = "20220405.02"
+} 
+
+variable "number_of_kube_nodes" {
+	description = "Number of kubernetes nodes"
+   	type = number
+    default = 3
+}