Update assets generation for bootkube v0.7.0

* Terraform's "type system" sometimes doesn't identify list
types correctly so be explicit
* https://github.com/hashicorp/terraform/issues/12263#issuecomment-282571256

.gitignore

@@ -1,2 +1,4 @@
 *.tfvars
+.terraform
 *.tfstate*
+assets

README.md

@@ -1,20 +1,23 @@
 # bootkube-terraform
 
-`bootkube-terraform` is a Terraform module that renders [bootkube](https://github.com/kubernetes-incubator/bootkube) assets, just like running the binary `bootkube render`. It aims to provide the same variable names, defaults, features, and outputs.
+`bootkube-terraform` is Terraform module that renders [kubernetes-incubator/bootkube](https://github.com/kubernetes-incubator/bootkube) bootstrapping assets. It functions as a low-level component of the [Typhoon](https://github.com/poseidon/typhoon) Kubernetes distribution.
+
+The module provides many of the same variable names, defaults, features, and outputs as running `bootkube render` directly.
 
 ## Usage
 
-Use the `bootkube-terraform` module within your existing Terraform configs. Provide the variables listed in `variables.tf` or check `terraform.tfvars.example` for examples.
+Use [Typhoon](https://github.com/poseidon/typhoon) to create and manage Kubernetes clusters in different environments. Use `bootkube-terraform` if you require low-level customizations to the control plane or wish to build your own distribution.
+
+Add the `bootkube-terraform` module alongside existing Terraform configs. Provide the variables listed in `variables.tf` or check `terraform.tfvars.example` for examples.
 
 ```hcl
 module "bootkube" {
-  source = "git://https://github.com/dghubble/bootkube-terraform.git?ref=SHA"
+  source = "git://https://github.com/poseidon/bootkube-terraform.git?ref=SHA"
 
   cluster_name = "example"
   api_servers = ["node1.example.com"]
   etcd_servers = ["node1.example.com"]
   asset_dir = "/home/core/clusters/mycluster"
-  experimental_self_hosted_etcd = false
 }
 ```
 
@@ -30,7 +33,7 @@ terraform apply
 
 ### Comparison
 
-Render bootkube assets directly with bootkube v0.6.1.
+Render bootkube assets directly with bootkube v0.7.0.
 
 #### On-host etcd
 
@@ -41,6 +44,9 @@ bootkube render --asset-dir=assets --api-servers=https://node1.example.com:443 -
 Compare assets. The only diffs you should see are TLS credentials.
 
 ```sh
+pushd /home/core/mycluster
+mv manifests-networking/* manifests
+popd
 diff -rw assets /home/core/mycluster
 ```
 
@@ -56,6 +62,7 @@ Compare assets. Note that experimental must be generated to a separate directory
 pushd /home/core/mycluster
 mv experimental/bootstrap-manifests/* boostrap-manifests
 mv experimental/manifests/* manifests
+mv manifests-networking/* manifests
 popd
 diff -rw assets /home/core/mycluster
 ```

assets.tf

@@ -22,7 +22,7 @@ resource "template_dir" "manifests" {
     hyperkube_image = "${var.container_images["hyperkube"]}"
     etcd_servers    = "${var.experimental_self_hosted_etcd ? format("https://%s:2379", cidrhost(var.service_cidr, 15)) : join(",", formatlist("https://%s:2379", var.etcd_servers))}"
 
-    cloud_provider = "${var.cloud_provider}"
+    cloud_provider      = "${var.cloud_provider}"
     pod_cidr            = "${var.pod_cidr}"
     service_cidr        = "${var.service_cidr}"
     kube_dns_service_ip = "${cidrhost(var.service_cidr, 10)}"
@@ -33,9 +33,9 @@ resource "template_dir" "manifests" {
     serviceaccount_pub = "${base64encode(tls_private_key.service-account.public_key_pem)}"
     serviceaccount_key = "${base64encode(tls_private_key.service-account.private_key_pem)}"
 
-    etcd_ca_cert = "${base64encode(tls_self_signed_cert.etcd-ca.cert_pem)}"
+    etcd_ca_cert     = "${base64encode(tls_self_signed_cert.etcd-ca.cert_pem)}"
     etcd_client_cert = "${base64encode(tls_locally_signed_cert.client.cert_pem)}"
-    etcd_client_key = "${base64encode(tls_private_key.client.private_key_pem)}"
+    etcd_client_key  = "${base64encode(tls_private_key.client.private_key_pem)}"
   }
 }
 
@@ -73,4 +73,3 @@ data "template_file" "user-kubeconfig" {
     server       = "${format("https://%s:443", element(var.api_servers, 0))}"
   }
 }
-

conditional.tf

@@ -1,8 +1,29 @@
 # Assets generated only when experimental self-hosted etcd is enabled
 
+resource "template_dir" "flannel-manifests" {
+  count           = "${var.networking == "flannel" ? 1 : 0}"
+  source_dir      = "${path.module}/resources/flannel"
+  destination_dir = "${var.asset_dir}/manifests-networking"
+
+  vars {
+    pod_cidr = "${var.pod_cidr}"
+  }
+}
+
+resource "template_dir" "calico-manifests" {
+  count           = "${var.networking == "calico" ? 1 : 0}"
+  source_dir      = "${path.module}/resources/calico"
+  destination_dir = "${var.asset_dir}/manifests-networking"
+
+  vars {
+    network_mtu = "${var.network_mtu}"
+    pod_cidr    = "${var.pod_cidr}"
+  }
+}
+
 # bootstrap-etcd.yaml pod bootstrap-manifest
 resource "template_dir" "experimental-bootstrap-manifests" {
-  count      = "${var.experimental_self_hosted_etcd ? 1 : 0}"
+  count           = "${var.experimental_self_hosted_etcd ? 1 : 0}"
   source_dir      = "${path.module}/resources/experimental/bootstrap-manifests"
   destination_dir = "${var.asset_dir}/experimental/bootstrap-manifests"
 
@@ -14,7 +35,7 @@ resource "template_dir" "experimental-bootstrap-manifests" {
 
 # etcd subfolder - bootstrap-etcd-service.json and migrate-etcd-cluster.json TPR
 resource "template_dir" "etcd-subfolder" {
-  count      = "${var.experimental_self_hosted_etcd ? 1 : 0}"
+  count           = "${var.experimental_self_hosted_etcd ? 1 : 0}"
   source_dir      = "${path.module}/resources/etcd"
   destination_dir = "${var.asset_dir}/etcd"
 
@@ -26,7 +47,7 @@ resource "template_dir" "etcd-subfolder" {
 # etcd-operator deployment and etcd-service manifests
 # etcd client, server, and peer tls secrets
 resource "template_dir" "experimental-manifests" {
-  count      = "${var.experimental_self_hosted_etcd ? 1 : 0}"
+  count           = "${var.experimental_self_hosted_etcd ? 1 : 0}"
   source_dir      = "${path.module}/resources/experimental/manifests"
   destination_dir = "${var.asset_dir}/experimental/manifests"
 
@@ -34,12 +55,12 @@ resource "template_dir" "experimental-manifests" {
     etcd_service_ip = "${cidrhost(var.service_cidr, 15)}"
 
     # Self-hosted etcd TLS certs / keys
-    etcd_ca_cert = "${base64encode(tls_self_signed_cert.etcd-ca.cert_pem)}"
+    etcd_ca_cert     = "${base64encode(tls_self_signed_cert.etcd-ca.cert_pem)}"
     etcd_client_cert = "${base64encode(tls_locally_signed_cert.client.cert_pem)}"
-    etcd_client_key = "${base64encode(tls_private_key.client.private_key_pem)}"
+    etcd_client_key  = "${base64encode(tls_private_key.client.private_key_pem)}"
     etcd_server_cert = "${base64encode(tls_locally_signed_cert.server.cert_pem)}"
-    etcd_server_key = "${base64encode(tls_private_key.server.private_key_pem)}"
-    etcd_peer_cert = "${base64encode(tls_locally_signed_cert.peer.cert_pem)}"
-    etcd_peer_key = "${base64encode(tls_private_key.peer.private_key_pem)}"
+    etcd_server_key  = "${base64encode(tls_private_key.server.private_key_pem)}"
+    etcd_peer_cert   = "${base64encode(tls_locally_signed_cert.peer.cert_pem)}"
+    etcd_peer_key    = "${base64encode(tls_private_key.peer.private_key_pem)}"
   }
 }

resources/calico/calico-bgp-peers.yaml

@@ -0,0 +1,13 @@
+apiVersion: apiextensions.k8s.io/v1beta1
+description: Calico BGP Peers
+kind: CustomResourceDefinition
+metadata:
+  name: bgppeers.crd.projectcalico.org
+spec:
+  scope: Cluster
+  group: crd.projectcalico.org
+  version: v1
+  names:
+    kind: BGPPeer
+    plural: bgppeers
+    singular: bgppeer

resources/calico/calico-cluster-role-binding.yaml

@@ -0,0 +1,12 @@
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: ClusterRoleBinding
+metadata:
+  name: calico-node
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: calico-node
+subjects:
+- kind: ServiceAccount
+  name: calico-node
+  namespace: kube-system

resources/calico/calico-cluster-role.yaml

@@ -0,0 +1,53 @@
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: ClusterRole
+metadata:
+  name: calico-node
+  namespace: kube-system
+rules:
+  - apiGroups: [""]
+    resources:
+      - namespaces
+    verbs:
+      - get
+      - list
+      - watch
+  - apiGroups: [""]
+    resources:
+      - pods/status
+    verbs:
+      - update
+  - apiGroups: [""]
+    resources:
+      - pods
+    verbs:
+      - get
+      - list
+      - watch
+  - apiGroups: [""]
+    resources:
+      - nodes
+    verbs:
+      - get
+      - list
+      - update
+      - watch
+  - apiGroups: ["extensions"]
+    resources:
+      - networkpolicies
+    verbs:
+      - get
+      - list
+      - watch
+  - apiGroups: ["crd.projectcalico.org"]
+    resources:
+      - globalfelixconfigs
+      - bgppeers
+      - globalbgpconfigs
+      - ippools
+      - globalnetworkpolicies
+    verbs:
+      - create
+      - get
+      - list
+      - update
+      - watch

resources/calico/calico-config.yaml

@@ -0,0 +1,29 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: calico-config
+  namespace: kube-system
+data:
+  # The CNI network configuration to install on each node.
+  cni_network_config: |-
+    {
+        "name": "k8s-pod-network",
+        "cniVersion": "0.3.0",
+        "type": "calico",
+        "log_level": "info",
+        "datastore_type": "kubernetes",
+        "nodename": "__KUBERNETES_NODE_NAME__",
+        "mtu": ${network_mtu},
+        "ipam": {
+            "type": "host-local",
+            "subnet": "usePodCidr"
+        },
+        "policy": {
+            "type": "k8s",
+            "k8s_auth_token": "__SERVICEACCOUNT_TOKEN__"
+        },
+        "kubernetes": {
+            "k8s_api_root": "https://__KUBERNETES_SERVICE_HOST__:__KUBERNETES_SERVICE_PORT__",
+            "kubeconfig": "__KUBECONFIG_FILEPATH__"
+        }
+    }

resources/calico/calico-gloabl-felix-configs.yaml

@@ -0,0 +1,13 @@
+apiVersion: apiextensions.k8s.io/v1beta1
+description: Calico Global Felix Configuration
+kind: CustomResourceDefinition
+metadata:
+   name: globalfelixconfigs.crd.projectcalico.org
+spec:
+  scope: Cluster
+  group: crd.projectcalico.org
+  version: v1
+  names:
+    kind: GlobalFelixConfig
+    plural: globalfelixconfigs
+    singular: globalfelixconfig

resources/calico/calico-global-bgp-configs.yaml

@@ -0,0 +1,13 @@
+apiVersion: apiextensions.k8s.io/v1beta1
+description: Calico Global BGP Configuration
+kind: CustomResourceDefinition
+metadata:
+  name: globalbgpconfigs.crd.projectcalico.org
+spec:
+  scope: Cluster
+  group: crd.projectcalico.org
+  version: v1
+  names:
+    kind: GlobalBGPConfig
+    plural: globalbgpconfigs
+    singular: globalbgpconfig

resources/calico/calico-ip-pools.yaml

@@ -0,0 +1,13 @@
+apiVersion: apiextensions.k8s.io/v1beta1
+description: Calico IP Pools
+kind: CustomResourceDefinition
+metadata:
+  name: ippools.crd.projectcalico.org
+spec:
+  scope: Cluster
+  group: crd.projectcalico.org
+  version: v1
+  names:
+    kind: IPPool
+    plural: ippools
+    singular: ippool

resources/calico/calico-network-policies.yaml

@@ -0,0 +1,13 @@
+apiVersion: apiextensions.k8s.io/v1beta1
+description: Calico Global Network Policies
+kind: CustomResourceDefinition
+metadata:
+  name: globalnetworkpolicies.crd.projectcalico.org
+spec:
+  scope: Cluster
+  group: crd.projectcalico.org
+  version: v1
+  names:
+    kind: GlobalNetworkPolicy
+    plural: globalnetworkpolicies
+    singular: globalnetworkpolicy

resources/calico/calico-service-account.yaml

@@ -0,0 +1,5 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: calico-node
+  namespace: kube-system

resources/calico/calico.yaml

@@ -0,0 +1,138 @@
+apiVersion: extensions/v1beta1
+kind: DaemonSet
+metadata:
+  name: calico-node
+  namespace: kube-system
+  labels:
+    k8s-app: calico-node
+spec:
+  selector:
+    matchLabels:
+      k8s-app: calico-node
+  template:
+    metadata:
+      labels:
+        k8s-app: calico-node
+      annotations:
+        scheduler.alpha.kubernetes.io/critical-pod: ''
+    spec:
+      hostNetwork: true
+      serviceAccountName: calico-node
+      tolerations:
+        # Allow the pod to run on master nodes
+        - key: node-role.kubernetes.io/master
+          effect: NoSchedule
+        # Mark the pod as a critical add-on for rescheduling
+        - key: "CriticalAddonsOnly"
+          operator: "Exists"
+      containers:
+        - name: calico-node
+          image: quay.io/calico/node:v2.6.1
+          env:
+            # Use Kubernetes API as the backing datastore.
+            - name: DATASTORE_TYPE
+              value: "kubernetes"
+            # Enable felix info logging.
+            - name: FELIX_LOGSEVERITYSCREEN
+              value: "info"
+            # Cluster type to identify the deployment type
+            - name: CLUSTER_TYPE
+              value: "k8s,bgp"
+            # Disable file logging so `kubectl logs` works.
+            - name: CALICO_DISABLE_FILE_LOGGING
+              value: "true"
+            # Set Felix endpoint to host default action to ACCEPT.
+            - name: FELIX_DEFAULTENDPOINTTOHOSTACTION
+              value: "ACCEPT"
+            # Disable IPV6 on Kubernetes.
+            - name: FELIX_IPV6SUPPORT
+              value: "false"
+            # Set MTU for tunnel device used if ipip is enabled
+            - name: FELIX_IPINIPMTU
+              value: "${network_mtu}"
+            # Wait for the datastore.
+            - name: WAIT_FOR_DATASTORE
+              value: "true"
+            # The Calico IPv4 pool CIDR (should match `--cluster-cidr`).
+            - name: CALICO_IPV4POOL_CIDR
+              value: "${pod_cidr}"
+            # Enable IPIP
+            - name: CALICO_IPV4POOL_IPIP
+              value: "always"
+            # Enable IP-in-IP within Felix.
+            - name: FELIX_IPINIPENABLED
+              value: "true"
+            # Set node name based on k8s nodeName.
+            - name: NODENAME
+              valueFrom:
+                fieldRef:
+                  fieldPath: spec.nodeName
+            - name: IP
+              valueFrom:
+                fieldRef:
+                  fieldPath: status.podIP
+            - name: FELIX_HEALTHENABLED
+              value: "true"
+          securityContext:
+            privileged: true
+          resources:
+            requests:
+              cpu: 250m
+          livenessProbe:
+            httpGet:
+              path: /liveness
+              port: 9099
+            periodSeconds: 10
+            initialDelaySeconds: 10
+            failureThreshold: 6
+          readinessProbe:
+            httpGet:
+              path: /readiness
+              port: 9099
+            periodSeconds: 10
+          volumeMounts:
+            - mountPath: /lib/modules
+              name: lib-modules
+              readOnly: true
+            - mountPath: /var/run/calico
+              name: var-run-calico
+              readOnly: false
+        # Install Calico CNI binaries and CNI network config file on nodes
+        - name: install-cni
+          image: quay.io/calico/cni:v1.11.0
+          command: ["/install-cni.sh"]
+          env:
+            - name: CNI_NETWORK_CONFIG
+              valueFrom:
+                configMapKeyRef:
+                  name: calico-config
+                  key: cni_network_config
+            - name: CNI_NET_DIR
+              value: "/etc/kubernetes/cni/net.d"
+            # Set node name based on k8s nodeName
+            - name: KUBERNETES_NODE_NAME
+              valueFrom:
+                fieldRef:
+                  fieldPath: spec.nodeName
+          volumeMounts:
+            - mountPath: /host/opt/cni/bin
+              name: cni-bin-dir
+            - mountPath: /host/etc/cni/net.d
+              name: cni-net-dir
+      volumes:
+        - name: lib-modules
+          hostPath:
+            path: /lib/modules
+        - name: var-run-calico
+          hostPath:
+            path: /var/run/calico
+        - name: cni-bin-dir
+          hostPath:
+            path: /opt/cni/bin
+        - name: cni-net-dir
+          hostPath:
+            path: /etc/kubernetes/cni/net.d
+  updateStrategy:
+    rollingUpdate:
+      maxUnavailable: 1
+    type: RollingUpdate

resources/etcd/migrate-etcd-cluster.json

@@ -1,6 +1,6 @@
 {
-  "apiVersion": "etcd.coreos.com/v1beta1",
-  "kind": "Cluster",
+  "apiVersion": "etcd.database.coreos.com/v1beta2",
+  "kind": "EtcdCluster",
   "metadata": {
     "name": "kube-etcd",
     "namespace": "kube-system"

resources/experimental/manifests/etcd-operator.yaml

@@ -19,10 +19,10 @@ spec:
     spec:
       containers:
       - name: etcd-operator
-        image: quay.io/coreos/etcd-operator:v0.4.2
+        image: quay.io/coreos/etcd-operator:v0.5.0
         command:
-          - /usr/local/bin/etcd-operator
-          - --analytics=false
+        - /usr/local/bin/etcd-operator
+        - --analytics=false
         env:
         - name: MY_POD_NAMESPACE
           valueFrom:

resources/flannel/kube-flannel-cfg.yaml

@@ -10,11 +10,21 @@ data:
   cni-conf.json: |
     {
       "name": "cbr0",
-      "type": "flannel",
-      "delegate": {
-        "isDefaultGateway": true,
-        "hairpinMode": true
-      }
+      "cniVersion": "0.3.1",
+      "plugins": [
+        {
+          "type": "flannel",
+          "delegate": {
+            "isDefaultGateway": true
+          }
+        },
+        {
+          "type": "portmap",
+          "capabilities": {
+            "portMappings": true
+          }
+        }
+      ]
     }
   net-conf.json: |
     {

resources/flannel/kube-flannel.yaml

@@ -40,7 +40,7 @@ spec:
         - name: flannel-cfg
           mountPath: /etc/kube-flannel/
       - name: install-cni
-        image: quay.io/coreos/flannel-cni:0.1.0
+        image: quay.io/coreos/flannel-cni:v0.3.0
         command: ["/install-cni.sh"]
         env:
         - name: CNI_NETWORK_CONFIG

resources/manifests/kube-apiserver.yaml

@@ -82,6 +82,6 @@ spec:
         hostPath:
           path: /var/lock
   updateStrategy:
-      rollingUpdate:
-        maxUnavailable: 1
-      type: RollingUpdate
+    rollingUpdate:
+      maxUnavailable: 1
+    type: RollingUpdate

resources/manifests/kube-dns-deployment.yaml

@@ -41,7 +41,7 @@ spec:
           optional: true
       containers:
       - name: kubedns
-        image: gcr.io/google_containers/k8s-dns-kube-dns-amd64:1.14.4
+        image: gcr.io/google_containers/k8s-dns-kube-dns-amd64:1.14.5
         resources:
           # TODO: Set memory limits when we've profiled the container for large
           # clusters, then set request = limit to keep this container in
@@ -92,7 +92,7 @@ spec:
         - name: kube-dns-config
           mountPath: /kube-dns-config
       - name: dnsmasq
-        image: gcr.io/google_containers/k8s-dns-dnsmasq-nanny-amd64:1.14.4
+        image: gcr.io/google_containers/k8s-dns-dnsmasq-nanny-amd64:1.14.5
         livenessProbe:
           httpGet:
             path: /healthcheck/dnsmasq
@@ -130,7 +130,7 @@ spec:
         - name: kube-dns-config
           mountPath: /etc/k8s/dns/dnsmasq-nanny
       - name: sidecar
-        image: gcr.io/google_containers/k8s-dns-sidecar-amd64:1.14.4
+        image: gcr.io/google_containers/k8s-dns-sidecar-amd64:1.14.5
         livenessProbe:
           httpGet:
             path: /metrics

resources/manifests/kube-proxy.yaml

@@ -56,4 +56,4 @@ spec:
   updateStrategy:
     rollingUpdate:
       maxUnavailable: 1
-    type: RollingUpdate 
+    type: RollingUpdate

resources/manifests/pod-checkpointer.yaml

@@ -17,7 +17,7 @@ spec:
     spec:
       containers:
       - name: pod-checkpointer
-        image: quay.io/coreos/pod-checkpointer:4e7a7dab10bc4d895b66c21656291c6e0b017248
+        image: quay.io/coreos/pod-checkpointer:abdcbc46df985b832cccf805b34f4652a0ca9d56
         command:
         - /checkpoint
         - --v=4
@@ -57,6 +57,6 @@ spec:
         hostPath:
           path: /var/run
   updateStrategy:
-      rollingUpdate:
-        maxUnavailable: 1
-      type: RollingUpdate
+    rollingUpdate:
+      maxUnavailable: 1
+    type: RollingUpdate

terraform.tfvars.example

@@ -2,4 +2,5 @@ cluster_name = "example"
 api_servers = ["node1.example.com"]
 etcd_servers = ["node1.example.com"]
 asset_dir = "/home/core/mycluster"
+networking = "flannel"
 experimental_self_hosted_etcd = false

tls-etcd.tf

@@ -100,13 +100,13 @@ resource "tls_cert_request" "client" {
     "${cidrhost(var.service_cidr, 20)}",
   ]
 
-  dns_names = "${concat(
+  dns_names = ["${concat(
     var.etcd_servers,
     list(
       "localhost",
       "*.kube-etcd.kube-system.svc.cluster.local",
       "kube-etcd-client.kube-system.svc.cluster.local",
-    ))}"
+    ))}"]
 }
 
 resource "tls_locally_signed_cert" "client" {
@@ -139,20 +139,20 @@ resource "tls_cert_request" "server" {
     common_name  = "etcd-server"
     organization = "etcd"
   }
-  
+
   ip_addresses = [
     "127.0.0.1",
     "${cidrhost(var.service_cidr, 15)}",
     "${cidrhost(var.service_cidr, 20)}",
   ]
 
-  dns_names = "${concat(
+  dns_names = ["${concat(
     var.etcd_servers,
     list(
       "localhost",
       "*.kube-etcd.kube-system.svc.cluster.local",
       "kube-etcd-client.kube-system.svc.cluster.local",
-    ))}"
+    ))}"]
 }
 
 resource "tls_locally_signed_cert" "server" {
@@ -185,17 +185,17 @@ resource "tls_cert_request" "peer" {
     common_name  = "etcd-peer"
     organization = "etcd"
   }
-  
+
   ip_addresses = [
-    "${cidrhost(var.service_cidr, 20)}"
+    "${cidrhost(var.service_cidr, 20)}",
   ]
-  
-  dns_names = "${concat(
+
+  dns_names = ["${concat(
     var.etcd_servers,
     list(
       "*.kube-etcd.kube-system.svc.cluster.local",
       "kube-etcd-client.kube-system.svc.cluster.local",
-    ))}"
+    ))}"]
 }
 
 resource "tls_locally_signed_cert" "peer" {

variables.tf

@@ -4,12 +4,12 @@ variable "cluster_name" {
 }
 
 variable "api_servers" {
-  description = "URL used to reach kube-apiserver"
+  description = "List of URLs used to reach kube-apiserver"
   type        = "list"
 }
 
 variable "etcd_servers" {
-  description = "List of etcd server URLs including protocol, host, and port. Ignored if experimental self-hosted etcd is enabled."
+  description = "List of URLs used to reach etcd servers. Ignored if experimental self-hosted etcd is enabled."
   type        = "list"
 }
 
@@ -29,6 +29,18 @@ variable "cloud_provider" {
   default     = ""
 }
 
+variable "networking" {
+  description = "Choice of networking provider (flannel or calico)"
+  type        = "string"
+  default     = "flannel"
+}
+
+variable "network_mtu" {
+  description = "CNI interface MTU (applies to calico only)"
+  type        = "string"
+  default     = "1500"
+}
+
 variable "pod_cidr" {
   description = "CIDR IP range to assign Kubernetes pods"
   type        = "string"
@@ -50,7 +62,7 @@ variable "container_images" {
   type        = "map"
 
   default = {
-    hyperkube = "quay.io/coreos/hyperkube:v1.7.3_coreos.0"
+    hyperkube = "quay.io/coreos/hyperkube:v1.7.7_coreos.0"
     etcd      = "quay.io/coreos/etcd:v3.1.8"
   }
 }