Feat: Multi-node k3s cluster

molecules/k3s/inputs.tf

@@ -8,6 +8,16 @@ variable "servers" {
   default = []
 }
 
+variable "agents" {
+  description = "machines which will run the workloads"
+  type = list(object({
+    host = string
+    user = string
+    private_key = string
+  }))
+  default = []
+}
+
 variable "k3s" {
   type = object({
     download_url = optional(string),

molecules/k3s/inputs.tfvars

@@ -1,5 +1,9 @@
-servers = [ {
-  host = "127.0.0.1"
-  private_key = "~/.ssh/id_rsa"
-  user = "root"
-} ]
+servers = [
+  {
+    host = "192.168.0.100"
+    private_key = "~/.ssh/id_rsa"
+    user = "root"
+  }
+]
+
+agents = []

molecules/k3s/server.tf → molecules/k3s/k3s-agents.tf

@@ -1,9 +1,9 @@
-resource "ssh_resource" "install_k3s" {
+resource "ssh_resource" "install_k3s_agent" {
   for_each = local.servers
   host     = each.value.host
   user     = each.value.user
   commands = [
-    "curl -sfL ${local.k3s.download_url} | INSTALL_K3S_VERSION='${local.k3s.version}' sh -s - server --docker --write-kubeconfig-mode 644 --disable=traefik"
+    "curl -sfL ${local.k3s.download_url} | INSTALL_K3S_VERSION='${local.k3s.version}' sh -s - agent"
     # TODO: For HA k3s cluster setup
     # "curl -sfL ${local.k3s.download_url} | INSTALL_K3S_VERSION='${local.k3s.version}' sh -s - server --cluster-init --docker --write-kubeconfig-mode 644 --disable=traefik"
   ]
@@ -13,7 +13,7 @@ resource "ssh_resource" "install_k3s" {
 
 # Note: Removed waiting for k3s server to be ready
 
-resource "ssh_resource" "uninstall_k3s" {
+resource "ssh_resource" "uninstall_k3s_agent" {
   for_each    = { for server in var.servers : server.host => server }
   host        = each.value.host
   when        = "destroy"

molecules/k3s/k3s-servers.tf

@@ -0,0 +1,29 @@
+resource "random_password" "agent_token" {
+  length           = 16
+  special          = true
+  override_special = "!#$%&*()-_=+[]{}<>:?"
+}
+
+resource "ssh_resource" "install_k3s_server" {
+  for_each = local.servers
+  host     = each.value.host
+  user     = each.value.user
+  commands = [
+    "curl -sfL ${local.k3s.download_url} | INSTALL_K3S_VERSION='${local.k3s.version}' K3S_AGENT_TOKEN=${random_password.agent_token.result} sh -s - server --docker --write-kubeconfig-mode 644 --disable=traefik"
+    # TODO: For HA k3s cluster setup
+    # "curl -sfL ${local.k3s.download_url} | INSTALL_K3S_VERSION='${local.k3s.version}' sh -s - server --cluster-init --docker --write-kubeconfig-mode 644 --disable=traefik"
+  ]
+  private_key = file(each.value.private_key)
+  timeout = "10m"
+}
+
+# Note: Removed waiting for k3s server to be ready
+
+resource "ssh_resource" "uninstall_k3s_server" {
+  for_each    = { for server in var.servers : server.host => server }
+  host        = each.value.host
+  when        = "destroy"
+  user        = each.value.user
+  commands    = ["bash -c 'k3s-killall.sh; k3s-uninstall.sh;'"]
+  private_key = file(each.value.private_key)
+}