From b80a2eb8a057e5cba79d8ccc889658a3f00c2147 Mon Sep 17 00:00:00 2001
From: Dalton Hubble <dghubble@gmail.com>
Date: Sat, 31 Mar 2018 13:11:42 -0700
Subject: [PATCH] Sync fedora-cloud modules with Container Linux

* Update manifests for Kubernetes v1.10.0
* Update etcd from v3.3.2 to v3.3.3
* Add disk_type optional variable on AWS
* Remove redundant kubeconfig copy on AWS
* Distribute etcd secres only to controllers
* Organize module variables and ssh steps
---
 aws/fedora-cloud/kubernetes/ami.tf            |  2 +-
 aws/fedora-cloud/kubernetes/bootkube.tf       |  2 +-
 .../kubernetes/cloudinit/controller.yaml.tmpl |  7 +-
 aws/fedora-cloud/kubernetes/controllers.tf    |  2 +-
 aws/fedora-cloud/kubernetes/ssh.tf            | 11 +++-
 aws/fedora-cloud/kubernetes/variables.tf      | 64 +++++++++++--------
 aws/fedora-cloud/kubernetes/workers/ami.tf    |  2 +-
 .../workers/cloudinit/worker.yaml.tmpl        |  5 +-
 .../kubernetes/workers/variables.tf           | 22 +++++--
 .../kubernetes/workers/workers.tf             |  2 +-
 .../fedora-cloud/kubernetes/bootkube.tf       |  4 +-
 .../kubernetes/cloudinit/controller.yaml.tmpl |  7 +-
 .../kubernetes/cloudinit/worker.yaml.tmpl     |  5 +-
 .../fedora-cloud/kubernetes/controllers.tf    |  4 +-
 digital-ocean/fedora-cloud/kubernetes/ssh.tf  | 42 +++++++++---
 .../fedora-cloud/kubernetes/variables.tf      | 49 +++++++-------
 .../fedora-cloud/kubernetes/workers.tf        |  2 +
 17 files changed, 142 insertions(+), 90 deletions(-)

diff --git a/aws/fedora-cloud/kubernetes/ami.tf b/aws/fedora-cloud/kubernetes/ami.tf
index 8aa1a486..41d86597 100644
--- a/aws/fedora-cloud/kubernetes/ami.tf
+++ b/aws/fedora-cloud/kubernetes/ami.tf
@@ -14,6 +14,6 @@ data "aws_ami" "fedora" {
 
   filter {
     name   = "name"
-    values = ["Fedora-Cloud-Base-27*-standard-0"]
+    values = ["Fedora-Cloud-Base-27*-gp2-0"]
   }
 }
diff --git a/aws/fedora-cloud/kubernetes/bootkube.tf b/aws/fedora-cloud/kubernetes/bootkube.tf
index eed1c531..b2621401 100644
--- a/aws/fedora-cloud/kubernetes/bootkube.tf
+++ b/aws/fedora-cloud/kubernetes/bootkube.tf
@@ -1,6 +1,6 @@
 # Self-hosted Kubernetes assets (kubeconfig, manifests)
 module "bootkube" {
-  source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=88b361207d42ec3121930a4add6b64ba7cf18360"
+  source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=5f3546b66ffb9946b36e612537bb6a1830ae7746"
 
   cluster_name          = "${var.cluster_name}"
   api_servers           = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"]
diff --git a/aws/fedora-cloud/kubernetes/cloudinit/controller.yaml.tmpl b/aws/fedora-cloud/kubernetes/cloudinit/controller.yaml.tmpl
index 9a441c5f..8f8d6047 100644
--- a/aws/fedora-cloud/kubernetes/cloudinit/controller.yaml.tmpl
+++ b/aws/fedora-cloud/kubernetes/cloudinit/controller.yaml.tmpl
@@ -7,9 +7,8 @@ yum_repos:
     gpgcheck: true
     gpgkey: https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
 packages:
-  - vim
-  - docker
-  - kubelet
+  - [docker, 1.13.1]
+  - [kubelet, 1.10.0]
   - nfs-utils
 write_files:
   - path: /etc/systemd/system/etcd-member.service
@@ -30,7 +29,7 @@ write_files:
         -v /etc/ssl/etcd:/etc/ssl/certs:ro,Z \
         -v /var/lib/etcd:/var/lib/etcd:Z \
         --env-file=/etc/etcd/etcd.conf \
-        quay.io/coreos/etcd:v3.3.2
+        quay.io/coreos/etcd:v3.3.3
       ExecStop=/usr/bin/docker stop etcd-member
       Restart=on-failure
       RestartSec=10s
diff --git a/aws/fedora-cloud/kubernetes/controllers.tf b/aws/fedora-cloud/kubernetes/controllers.tf
index 9ed461c3..875d44a0 100644
--- a/aws/fedora-cloud/kubernetes/controllers.tf
+++ b/aws/fedora-cloud/kubernetes/controllers.tf
@@ -28,7 +28,7 @@ resource "aws_instance" "controllers" {
 
   # storage
   root_block_device {
-    volume_type = "standard"
+    volume_type = "${var.disk_type}"
     volume_size = "${var.disk_size}"
   }
 
diff --git a/aws/fedora-cloud/kubernetes/ssh.tf b/aws/fedora-cloud/kubernetes/ssh.tf
index a667727c..11a500fd 100644
--- a/aws/fedora-cloud/kubernetes/ssh.tf
+++ b/aws/fedora-cloud/kubernetes/ssh.tf
@@ -1,5 +1,5 @@
 # Secure copy etcd TLS assets to controllers.
-resource "null_resource" "copy-secrets" {
+resource "null_resource" "copy-controller-secrets" {
   count = "${var.controller_count}"
 
   connection {
@@ -61,7 +61,11 @@ resource "null_resource" "copy-secrets" {
 # Secure copy bootkube assets to ONE controller and start bootkube to perform
 # one-time self-hosted cluster bootstrapping.
 resource "null_resource" "bootkube-start" {
-  depends_on = ["module.bootkube", "null_resource.copy-secrets", "aws_route53_record.apiserver"]
+  depends_on = [
+    "null_resource.copy-controller-secrets",
+    "module.workers",
+    "aws_route53_record.apiserver",
+  ]
 
   connection {
     type    = "ssh"
@@ -77,7 +81,8 @@ resource "null_resource" "bootkube-start" {
 
   provisioner "remote-exec" {
     inline = [
-      "sudo mv assets /opt/bootkube",
+      "while [ ! -f /var/lib/cloud/instance/boot-finished ]; do sleep 4; done",
+      "sudo mv $HOME/assets /opt/bootkube",
       "sudo systemctl start bootkube",
     ]
   }
diff --git a/aws/fedora-cloud/kubernetes/variables.tf b/aws/fedora-cloud/kubernetes/variables.tf
index 44becb37..0cb40ba7 100644
--- a/aws/fedora-cloud/kubernetes/variables.tf
+++ b/aws/fedora-cloud/kubernetes/variables.tf
@@ -1,11 +1,13 @@
 variable "cluster_name" {
   type        = "string"
-  description = "Cluster name"
+  description = "Unique cluster name (prepended to dns_zone)"
 }
 
+# AWS
+
 variable "dns_zone" {
   type        = "string"
-  description = "AWS DNS Zone (e.g. aws.dghubble.io)"
+  description = "AWS DNS Zone (e.g. aws.example.com)"
 }
 
 variable "dns_zone_id" {
@@ -13,33 +15,12 @@ variable "dns_zone_id" {
   description = "AWS DNS Zone ID (e.g. Z3PAABBCFAKEC0)"
 }
 
-variable "ssh_authorized_key" {
-  type        = "string"
-  description = "SSH public key for user 'core'"
-}
-
-variable "disk_size" {
-  type        = "string"
-  default     = "40"
-  description = "The size of the disk in Gigabytes"
-}
-
-variable "host_cidr" {
-  description = "CIDR IPv4 range to assign to EC2 nodes"
-  type        = "string"
-  default     = "10.0.0.0/16"
-}
+# instances
 
 variable "controller_count" {
   type        = "string"
   default     = "1"
-  description = "Number of controllers"
-}
-
-variable "controller_type" {
-  type        = "string"
-  default     = "t2.small"
-  description = "Controller EC2 instance type"
+  description = "Number of controllers (i.e. masters)"
 }
 
 variable "worker_count" {
@@ -48,13 +29,36 @@ variable "worker_count" {
   description = "Number of workers"
 }
 
+variable "controller_type" {
+  type        = "string"
+  default     = "t2.small"
+  description = "EC2 instance type for controllers"
+}
+
 variable "worker_type" {
   type        = "string"
   default     = "t2.small"
-  description = "Worker EC2 instance type"
+  description = "EC2 instance type for workers"
 }
 
-# bootkube assets
+variable "disk_size" {
+  type        = "string"
+  default     = "40"
+  description = "Size of the EBS volume in GB"
+}
+
+variable "disk_type" {
+  type        = "string"
+  default     = "gp2"
+  description = "Type of the EBS volume (e.g. standard, gp2, io1)"
+}
+
+# configuration
+
+variable "ssh_authorized_key" {
+  type        = "string"
+  description = "SSH public key for user 'fedora'"
+}
 
 variable "asset_dir" {
   description = "Path to a directory where generated assets should be placed (contains secrets)"
@@ -73,6 +77,12 @@ variable "network_mtu" {
   default     = "1480"
 }
 
+variable "host_cidr" {
+  description = "CIDR IPv4 range to assign to EC2 nodes"
+  type        = "string"
+  default     = "10.0.0.0/16"
+}
+
 variable "pod_cidr" {
   description = "CIDR IPv4 range to assign Kubernetes pods"
   type        = "string"
diff --git a/aws/fedora-cloud/kubernetes/workers/ami.tf b/aws/fedora-cloud/kubernetes/workers/ami.tf
index 8aa1a486..41d86597 100644
--- a/aws/fedora-cloud/kubernetes/workers/ami.tf
+++ b/aws/fedora-cloud/kubernetes/workers/ami.tf
@@ -14,6 +14,6 @@ data "aws_ami" "fedora" {
 
   filter {
     name   = "name"
-    values = ["Fedora-Cloud-Base-27*-standard-0"]
+    values = ["Fedora-Cloud-Base-27*-gp2-0"]
   }
 }
diff --git a/aws/fedora-cloud/kubernetes/workers/cloudinit/worker.yaml.tmpl b/aws/fedora-cloud/kubernetes/workers/cloudinit/worker.yaml.tmpl
index e26ed199..4b10bd8b 100644
--- a/aws/fedora-cloud/kubernetes/workers/cloudinit/worker.yaml.tmpl
+++ b/aws/fedora-cloud/kubernetes/workers/cloudinit/worker.yaml.tmpl
@@ -7,9 +7,8 @@ yum_repos:
     gpgcheck: true
     gpgkey: https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
 packages:
-  - vim
-  - docker
-  - kubelet
+  - [docker, 1.13.1]
+  - [kubelet, 1.10.0]
   - nfs-utils
 write_files:
   - path: /etc/systemd/system/kubelet.service.d/10-typhoon.conf
diff --git a/aws/fedora-cloud/kubernetes/workers/variables.tf b/aws/fedora-cloud/kubernetes/workers/variables.tf
index ae32d3e3..0d427a32 100644
--- a/aws/fedora-cloud/kubernetes/workers/variables.tf
+++ b/aws/fedora-cloud/kubernetes/workers/variables.tf
@@ -1,21 +1,23 @@
 variable "name" {
   type        = "string"
-  description = "Unique name instance group"
+  description = "Unique name for the worker pool"
 }
 
+# AWS
+
 variable "vpc_id" {
   type        = "string"
-  description = "ID of the VPC for creating instances"
+  description = "Must be set to `vpc_id` output by cluster"
 }
 
 variable "subnet_ids" {
   type        = "list"
-  description = "List of subnet IDs for creating instances"
+  description = "Must be set to `subnet_ids` output by cluster"
 }
 
 variable "security_groups" {
   type        = "list"
-  description = "List of security group IDs"
+  description = "Must be set to `worker_security_groups` output by cluster"
 }
 
 # instances
@@ -35,19 +37,25 @@ variable "instance_type" {
 variable "disk_size" {
   type        = "string"
   default     = "40"
-  description = "Size of the disk in GB"
+  description = "Size of the EBS volume in GB"
+}
+
+variable "disk_type" {
+  type        = "string"
+  default     = "gp2"
+  description = "Type of the EBS volume (e.g. standard, gp2, io1)"
 }
 
 # configuration
 
 variable "kubeconfig" {
   type        = "string"
-  description = "Generated Kubelet kubeconfig"
+  description = "Must be set to `kubeconfig` output by cluster"
 }
 
 variable "ssh_authorized_key" {
   type        = "string"
-  description = "SSH public key for user 'core'"
+  description = "SSH public key for user 'fedora'"
 }
 
 variable "service_cidr" {
diff --git a/aws/fedora-cloud/kubernetes/workers/workers.tf b/aws/fedora-cloud/kubernetes/workers/workers.tf
index 65086e0d..05b1516b 100644
--- a/aws/fedora-cloud/kubernetes/workers/workers.tf
+++ b/aws/fedora-cloud/kubernetes/workers/workers.tf
@@ -42,7 +42,7 @@ resource "aws_launch_configuration" "worker" {
 
   # storage
   root_block_device {
-    volume_type = "standard"
+    volume_type = "${var.disk_type}"
     volume_size = "${var.disk_size}"
   }
 
diff --git a/digital-ocean/fedora-cloud/kubernetes/bootkube.tf b/digital-ocean/fedora-cloud/kubernetes/bootkube.tf
index 92af5553..b0488323 100644
--- a/digital-ocean/fedora-cloud/kubernetes/bootkube.tf
+++ b/digital-ocean/fedora-cloud/kubernetes/bootkube.tf
@@ -1,12 +1,12 @@
 # Self-hosted Kubernetes assets (kubeconfig, manifests)
 module "bootkube" {
-  source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=88b361207d42ec3121930a4add6b64ba7cf18360"
+  source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=5f3546b66ffb9946b36e612537bb6a1830ae7746"
 
   cluster_name          = "${var.cluster_name}"
   api_servers           = ["${format("%s.%s", var.cluster_name, var.dns_zone)}"]
   etcd_servers          = "${digitalocean_record.etcds.*.fqdn}"
   asset_dir             = "${var.asset_dir}"
-  networking            = "${var.networking}"
+  networking            = "flannel"
   network_mtu           = 1440
   pod_cidr              = "${var.pod_cidr}"
   service_cidr          = "${var.service_cidr}"
diff --git a/digital-ocean/fedora-cloud/kubernetes/cloudinit/controller.yaml.tmpl b/digital-ocean/fedora-cloud/kubernetes/cloudinit/controller.yaml.tmpl
index a33a1708..bd1fd307 100644
--- a/digital-ocean/fedora-cloud/kubernetes/cloudinit/controller.yaml.tmpl
+++ b/digital-ocean/fedora-cloud/kubernetes/cloudinit/controller.yaml.tmpl
@@ -7,9 +7,8 @@ yum_repos:
     gpgcheck: true
     gpgkey: https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
 packages:
-  - vim
-  - docker
-  - kubelet
+  - [docker, 1.13.1]
+  - [kubelet, 1.10.0]
   - nfs-utils
 write_files:
   - path: /etc/systemd/system/cloud-metadata.service
@@ -43,7 +42,7 @@ write_files:
         -v /etc/ssl/etcd:/etc/ssl/certs:ro,Z \
         -v /var/lib/etcd:/var/lib/etcd:Z \
         --env-file=/etc/etcd/etcd.conf \
-        quay.io/coreos/etcd:v3.3.2
+        quay.io/coreos/etcd:v3.3.3
       ExecStop=/usr/bin/docker stop etcd-member
       Restart=on-failure
       RestartSec=10s
diff --git a/digital-ocean/fedora-cloud/kubernetes/cloudinit/worker.yaml.tmpl b/digital-ocean/fedora-cloud/kubernetes/cloudinit/worker.yaml.tmpl
index 50821cac..8b209a7c 100644
--- a/digital-ocean/fedora-cloud/kubernetes/cloudinit/worker.yaml.tmpl
+++ b/digital-ocean/fedora-cloud/kubernetes/cloudinit/worker.yaml.tmpl
@@ -7,9 +7,8 @@ yum_repos:
     gpgcheck: true
     gpgkey: https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
 packages:
-  - vim
-  - docker
-  - kubelet
+  - [docker, 1.13.1]
+  - [kubelet, 1.10.0]
   - nfs-utils
 write_files:
   - path: /etc/systemd/system/cloud-metadata.service
diff --git a/digital-ocean/fedora-cloud/kubernetes/controllers.tf b/digital-ocean/fedora-cloud/kubernetes/controllers.tf
index 33a66bf3..0925efbb 100644
--- a/digital-ocean/fedora-cloud/kubernetes/controllers.tf
+++ b/digital-ocean/fedora-cloud/kubernetes/controllers.tf
@@ -45,6 +45,8 @@ resource "digitalocean_droplet" "controllers" {
   private_networking = true
 
   user_data = "${element(data.template_file.controller-cloudinit.*.rendered, count.index)}"
+  ssh_keys  = ["${var.ssh_fingerprints}"]
+  
   tags = [
     "${digitalocean_tag.controllers.id}",
   ]
@@ -67,7 +69,7 @@ data "template_file" "controller-cloudinit" {
     etcd_domain = "${var.cluster_name}-etcd${count.index}.${var.dns_zone}"
 
     # etcd0=https://cluster-etcd0.example.com,etcd1=https://cluster-etcd1.example.com,...
-    etcd_initial_cluster  = "${join(",", formatlist("%s=https://%s:2380", null_resource.repeat.*.triggers.name, null_resource.repeat.*.triggers.domain))}"
+    etcd_initial_cluster = "${join(",", formatlist("%s=https://%s:2380", null_resource.repeat.*.triggers.name, null_resource.repeat.*.triggers.domain))}"
 
     ssh_authorized_key    = "${var.ssh_authorized_key}"
     k8s_dns_service_ip    = "${cidrhost(var.service_cidr, 10)}"
diff --git a/digital-ocean/fedora-cloud/kubernetes/ssh.tf b/digital-ocean/fedora-cloud/kubernetes/ssh.tf
index 88c0ddf2..868195c7 100644
--- a/digital-ocean/fedora-cloud/kubernetes/ssh.tf
+++ b/digital-ocean/fedora-cloud/kubernetes/ssh.tf
@@ -1,10 +1,10 @@
-# Secure copy kubeconfig to all nodes. Activates kubelet.service
-resource "null_resource" "copy-secrets" {
-  count = "${var.controller_count + var.worker_count}"
+# Secure copy etcd TLS assets and kubeconfig to controllers. Activates kubelet.service
+resource "null_resource" "copy-controller-secrets" {
+  count = "${var.controller_count}"
 
   connection {
     type    = "ssh"
-    host    = "${element(concat(digitalocean_droplet.controllers.*.ipv4_address, digitalocean_droplet.workers.*.ipv4_address), count.index)}"
+    host    = "${element(concat(digitalocean_droplet.controllers.*.ipv4_address), count.index)}"
     user    = "fedora"
     timeout = "15m"
   }
@@ -51,7 +51,6 @@ resource "null_resource" "copy-secrets" {
 
   provisioner "remote-exec" {
     inline = [
-      "while [ ! -f /var/lib/cloud/instance/boot-finished ]; do sleep 4; done",
       "sudo mkdir -p /etc/ssl/etcd/etcd",
       "sudo mv etcd-client* /etc/ssl/etcd/",
       "sudo cp /etc/ssl/etcd/etcd-client-ca.crt /etc/ssl/etcd/etcd/server-ca.crt",
@@ -60,7 +59,30 @@ resource "null_resource" "copy-secrets" {
       "sudo cp /etc/ssl/etcd/etcd-client-ca.crt /etc/ssl/etcd/etcd/peer-ca.crt",
       "sudo mv etcd-peer.crt /etc/ssl/etcd/etcd/peer.crt",
       "sudo mv etcd-peer.key /etc/ssl/etcd/etcd/peer.key",
-      "sudo mv kubeconfig /etc/kubernetes/kubeconfig",
+      "sudo mv $HOME/kubeconfig /etc/kubernetes/kubeconfig",
+    ]
+  }
+}
+
+# Secure copy kubeconfig to all workers. Activates kubelet.service.
+resource "null_resource" "copy-worker-secrets" {
+  count = "${var.worker_count}"
+
+  connection {
+    type    = "ssh"
+    host    = "${element(concat(digitalocean_droplet.workers.*.ipv4_address), count.index)}"
+    user    = "fedora"
+    timeout = "15m"
+  }
+
+  provisioner "file" {
+    content     = "${module.bootkube.kubeconfig}"
+    destination = "$HOME/kubeconfig"
+  }
+
+  provisioner "remote-exec" {
+    inline = [
+      "sudo mv $HOME/kubeconfig /etc/kubernetes/kubeconfig",
     ]
   }
 }
@@ -68,7 +90,10 @@ resource "null_resource" "copy-secrets" {
 # Secure copy bootkube assets to ONE controller and start bootkube to perform
 # one-time self-hosted cluster bootstrapping.
 resource "null_resource" "bootkube-start" {
-  depends_on = ["module.bootkube", "null_resource.copy-secrets"]
+  depends_on = [
+    "null_resource.copy-controller-secrets",
+    "null_resource.copy-worker-secrets",
+  ]
 
   connection {
     type    = "ssh"
@@ -84,7 +109,8 @@ resource "null_resource" "bootkube-start" {
 
   provisioner "remote-exec" {
     inline = [
-      "sudo mv assets /opt/bootkube",
+      "while [ ! -f /var/lib/cloud/instance/boot-finished ]; do sleep 4; done",
+      "sudo mv $HOME/assets /opt/bootkube",
       "sudo systemctl start bootkube",
     ]
   }
diff --git a/digital-ocean/fedora-cloud/kubernetes/variables.tf b/digital-ocean/fedora-cloud/kubernetes/variables.tf
index 35abe980..575cf519 100644
--- a/digital-ocean/fedora-cloud/kubernetes/variables.tf
+++ b/digital-ocean/fedora-cloud/kubernetes/variables.tf
@@ -1,8 +1,10 @@
 variable "cluster_name" {
   type        = "string"
-  description = "Unique cluster name"
+  description = "Unique cluster name (prepended to dns_zone)"
 }
 
+# Digital Ocean
+
 variable "region" {
   type        = "string"
   description = "Digital Ocean region (e.g. nyc1, sfo2, fra1, tor1)"
@@ -13,22 +15,12 @@ variable "dns_zone" {
   description = "Digital Ocean domain (i.e. DNS zone) (e.g. do.example.com)"
 }
 
-variable "image" {
-  type        = "string"
-  default     = "fedora-27-x64"
-  description = "OS image from which to initialize the disk (e.g. fedora-27-x64)"
-}
+# instances
 
 variable "controller_count" {
   type        = "string"
   default     = "1"
-  description = "Number of controllers"
-}
-
-variable "controller_type" {
-  type        = "string"
-  default     = "s-2vcpu-2gb"
-  description = "Digital Ocean droplet size (e.g. s-2vcpu-2gb, s-2vcpu-4gb, s-4vcpu-8gb)."
+  description = "Number of controllers (i.e. masters)"
 }
 
 variable "worker_count" {
@@ -37,39 +29,50 @@ variable "worker_count" {
   description = "Number of workers"
 }
 
+variable "controller_type" {
+  type        = "string"
+  default     = "s-2vcpu-2gb"
+  description = "Droplet type for controllers (e.g. s-2vcpu-2gb, s-2vcpu-4gb, s-4vcpu-8gb)"
+}
+
 variable "worker_type" {
   type        = "string"
   default     = "s-1vcpu-1gb"
-  description = "Digital Ocean droplet size (e.g. s-1vcpu-1gb, s-1vcpu-2gb, s-2vcpu-2gb)"
+  description = "Droplet type for workers (e.g. s-1vcpu-1gb, s-1vcpu-2gb, s-2vcpu-2gb)"
 }
 
+variable "image" {
+  type        = "string"
+  default     = "fedora-27-x64"
+  description = "OS image from which to initialize the disk (e.g. fedora-27-x64)"
+}
+
+# configuration
+
 variable "ssh_authorized_key" {
   type        = "string"
   description = "SSH public key for user 'fedora'"
 }
 
-# bootkube assets
+variable "ssh_fingerprints" {
+  type        = "list"
+  description = "SSH public key fingerprints. (e.g. see `ssh-add -l -E md5`)"
+}
 
 variable "asset_dir" {
   description = "Path to a directory where generated assets should be placed (contains secrets)"
   type        = "string"
 }
 
-variable "networking" {
-  description = "Choice of networking provider (flannel or calico)"
-  type        = "string"
-  default     = "flannel"
-}
-
 variable "pod_cidr" {
-  description = "CIDR IP range to assign Kubernetes pods"
+  description = "CIDR IPv4 range to assign Kubernetes pods"
   type        = "string"
   default     = "10.2.0.0/16"
 }
 
 variable "service_cidr" {
   description = <<EOD
-CIDR IP range to assign Kubernetes services.
+CIDR IPv4 range to assign Kubernetes services.
 The 1st IP will be reserved for kube_apiserver, the 10th IP will be reserved for kube-dns.
 EOD
 
diff --git a/digital-ocean/fedora-cloud/kubernetes/workers.tf b/digital-ocean/fedora-cloud/kubernetes/workers.tf
index 2ffa1f74..ba373902 100644
--- a/digital-ocean/fedora-cloud/kubernetes/workers.tf
+++ b/digital-ocean/fedora-cloud/kubernetes/workers.tf
@@ -26,6 +26,8 @@ resource "digitalocean_droplet" "workers" {
   private_networking = true
 
   user_data = "${data.template_file.worker-cloudinit.rendered}"
+  ssh_keys  = ["${var.ssh_fingerprints}"]
+
   tags = [
     "${digitalocean_tag.workers.id}",
   ]