Add bare-metal network_ip_autodetection_method variable for multi-NIC

* Allow setting the Calico host IPv4 address autodetection method
* Use Calico's default "first-found" method to support single NIC
and bonded NIC nodes
* Allow methods like `can-reach=IP` or `interface=REGEX` for multi
NIC nodes
* https://docs.projectcalico.org/v3.1/reference/node/configuration#ip-autodetection-methods

CHANGES.md

@@ -19,6 +19,12 @@ Notable changes between versions.
 * Replace `os_channel` variable with `os_image` to align naming across clouds
   * Please change values `stable`, `beta`, or `alpha` to `coreos-stable` (default), `coreos-beta`, `coreos-alpha` (action required!)
 
+#### Bare-Metal
+
+* Add `network_ip_autodetection_method` variable for Calico host IPv4 address detection
+  * Use Calico's default "first-found" to support single NIC and bonded NIC nodes 
+  * Allow [alternative](https://docs.projectcalico.org/v3.1/reference/node/configuration#ip-autodetection-methods) methods for multi NIC nodes, like `can-reach=IP` or `interface=REGEX`
+
 #### Addons
 
 * Fix Prometheus data directory location ([#203](https://github.com/poseidon/typhoon/pull/203))

bare-metal/container-linux/kubernetes/bootkube.tf

@@ -2,13 +2,14 @@
 module "bootkube" {
   source = "git::https://github.com/poseidon/terraform-render-bootkube.git?ref=28f68db28e06e9fe3422ed49c98986375783a862"
 
-  cluster_name          = "${var.cluster_name}"
-  api_servers           = ["${var.k8s_domain_name}"]
-  etcd_servers          = ["${var.controller_domains}"]
-  asset_dir             = "${var.asset_dir}"
-  networking            = "${var.networking}"
-  network_mtu           = "${var.network_mtu}"
-  pod_cidr              = "${var.pod_cidr}"
-  service_cidr          = "${var.service_cidr}"
-  cluster_domain_suffix = "${var.cluster_domain_suffix}"
+  cluster_name                    = "${var.cluster_name}"
+  api_servers                     = ["${var.k8s_domain_name}"]
+  etcd_servers                    = ["${var.controller_domains}"]
+  asset_dir                       = "${var.asset_dir}"
+  networking                      = "${var.networking}"
+  network_mtu                     = "${var.network_mtu}"
+  network_ip_autodetection_method = "${var.network_ip_autodetection_method}"
+  pod_cidr                        = "${var.pod_cidr}"
+  service_cidr                    = "${var.service_cidr}"
+  cluster_domain_suffix           = "${var.cluster_domain_suffix}"
 }

bare-metal/container-linux/kubernetes/variables.tf

@@ -76,6 +76,12 @@ variable "network_mtu" {
   default     = "1480"
 }
 
+variable "network_ip_autodetection_method" {
+  description = "Method to autodetect the host IPv4 address (applies to calico only)"
+  type        = "string"
+  default     = "first-found"
+}
+
 variable "pod_cidr" {
   description = "CIDR IPv4 range to assign Kubernetes pods"
   type        = "string"

docs/cl/bare-metal.md

@@ -374,6 +374,7 @@ Check the [variables.tf](https://github.com/poseidon/typhoon/blob/master/bare-me
 | container_linux_oem | Specify alternative OEM image ids for the disk install | "" | "vmware_raw", "xen" |
 | networking | Choice of networking provider | "calico" | "calico" or "flannel" |
 | network_mtu | CNI interface MTU (calico-only) | 1480 | - | 
+| network_ip_autodetection_method | Method to detect host IPv4 address (calico-only) | first-found | can-reach=10.0.0.1 |
 | pod_cidr | CIDR IPv4 range to assign to Kubernetes pods | "10.2.0.0/16" | "10.22.0.0/16" |
 | service_cidr | CIDR IPv4 range to assign to Kubernetes services | "10.3.0.0/16" | "10.3.0.0/24" |
 | cluster_domain_suffix | FQDN suffix for Kubernetes services answered by kube-dns. | "cluster.local" | "k8s.example.com" |