Merge pull request #1 from rancher/import-k3s

add import functionality

README.md

@@ -39,6 +39,7 @@ This module supports creating a k3s cluster with a postgres backend in AWS. By d
 | rancher\_chart | Helm chart to use for Rancher install | string | `"rancher-stable/rancher"` | no |
 | rancher\_password |  | string | n/a | yes |
 | rancher\_version | Version of Rancher to install | string | `"2.3.1"` | no |
+| registration\_command | Registration command to import cluster into Rancher. Should not be used when installing Rancher in this same cluster | string | `""` | no |
 | server\_image\_id | AMI to use for k3s server instances | string | `"null"` | no |
 | server\_instance\_ssh\_user | Username for sshing into instances | string | `"ubuntu"` | no |
 | server\_instance\_type |  | string | `"m5.large"` | no |

data.tf

@@ -67,6 +67,11 @@ data "template_cloudinit_config" "k3s_server" {
     content_type = "text/x-shellscript"
     content      = templatefile("${path.module}/files/rancher-install.sh", { certmanager_version = local.certmanager_version, letsencrypt_email = local.letsencrypt_email, rancher_version = local.rancher_version, rancher_hostname = "${local.name}.${local.domain}", install_rancher = local.install_rancher, install_ingress = local.install_ingress, install_certmanager = local.install_certmanager })
   }
+
+  part {
+    content_type = "text/x-shellscript"
+    content      = templatefile("${path.module}/files/register-to-rancher.sh", { is_k3s_server = true, install_rancher = local.install_rancher, registration_command = local.registration_command })
+  }
 }
 
 data "template_cloudinit_config" "k3s_agent" {

files/k3s-install.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-%{ if !is_k3s_server }
+%{ if is_k3s_server }
 curl -o ${storage_cafile} https://s3.amazonaws.com/rds-downloads/rds-combined-ca-bundle.pem
 %{ endif }
 

files/register-to-rancher.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+%{ if is_k3s_server }
+  %{ if !install_rancher }
+${registration_command}
+  %{ endif }
+%{ endif }

main.tf

@@ -50,6 +50,7 @@ locals {
   install_rancher             = var.install_rancher
   install_ingress             = var.install_ingress
   create_external_nlb         = var.create_external_nlb ? 1 : 0
+  registration_command        = var.registration_command
 }
 
 resource "random_password" "k3s_cluster_secret" {

variables.tf

@@ -233,3 +233,9 @@ variable "storage_cafile" {
   type        = string
   description = "Location to download RDS CA Bundle"
 }
+
+variable "registration_command" {
+  default     = ""
+  type        = string
+  description = "Registration command to import cluster into Rancher. Should not be used when installing Rancher in this same cluster"
+}