add support for non-amd64 arch gcr.io images

Currently all the gcr.io images used in kubespray can only run on x86.
Also gcr.io has not fully support multi-arch docker images.

Add extra var "image_arch" (default is amd64) to support running other
platforms, like arm64.

Change-Id: I8e1c9af533c021cb96ade291a1ce58773b40e271

roles/dnsmasq/defaults/main.yml

@@ -33,3 +33,6 @@ dnsmasq_min_replicas: 1
 
 # Custom name servers
 dnsmasq_upstream_dns_servers: []
+
+# Arch of Docker images and needed packages
+image_arch: amd64

roles/download/defaults/main.yml

@@ -23,6 +23,9 @@ download_always_pull: False
 # Use the first kube-master if download_localhost is not set
 download_delegate: "{% if download_localhost %}localhost{% else %}{{groups['kube-master'][0]}}{% endif %}"
 
+# Arch of Docker images and needed packages
+image_arch: amd64
+
 # Versions
 kube_version: v1.10.2
 kubeadm_version: "{{ kube_version }}"
@@ -45,8 +48,8 @@ cilium_version: "v1.0.0-rc8"
 
 # Download URLs
 istioctl_download_url: "https://storage.googleapis.com/istio-release/releases/{{ istio_version }}/istioctl/istioctl-linux"
-kubeadm_download_url: "https://storage.googleapis.com/kubernetes-release/release/{{ kubeadm_version }}/bin/linux/amd64/kubeadm"
-vault_download_url: "https://releases.hashicorp.com/vault/{{ vault_version }}/vault_{{ vault_version }}_linux_amd64.zip"
+kubeadm_download_url: "https://storage.googleapis.com/kubernetes-release/release/{{ kubeadm_version }}/bin/linux/{{ image_arch }}/kubeadm"
+vault_download_url: "https://releases.hashicorp.com/vault/{{ vault_version }}/vault_{{ vault_version }}_linux_{{ image_arch }}.zip"
 
 # Checksums
 istioctl_checksum: fd703063c540b8c0ab943f478c05ab257d88ae27224c746a27d0526ddbf7c370
@@ -86,9 +89,9 @@ istio_sidecar_initializer_image_repo: docker.io/istio/sidecar_initializer
 istio_sidecar_initializer_image_tag: "{{ istio_version }}"
 istio_statsd_image_repo: prom/statsd-exporter
 istio_statsd_image_tag: latest
-hyperkube_image_repo: "gcr.io/google-containers/hyperkube"
+hyperkube_image_repo: "gcr.io/google-containers/hyperkube-{{ image_arch }}"
 hyperkube_image_tag: "{{ kube_version }}"
-pod_infra_image_repo: "gcr.io/google_containers/pause-amd64"
+pod_infra_image_repo: "gcr.io/google_containers/pause-{{ image_arch }}"
 pod_infra_image_tag: "{{ pod_infra_version }}"
 install_socat_image_repo: "xueshanf/install-socat"
 install_socat_image_tag: "latest"
@@ -115,20 +118,20 @@ dnsmasq_version: 2.78
 dnsmasq_image_repo: "andyshinn/dnsmasq"
 dnsmasq_image_tag: "{{ dnsmasq_version }}"
 kubedns_version: 1.14.10
-kubedns_image_repo: "gcr.io/google_containers/k8s-dns-kube-dns-amd64"
+kubedns_image_repo: "gcr.io/google_containers/k8s-dns-kube-dns-{{ image_arch }}"
 kubedns_image_tag: "{{ kubedns_version }}"
 coredns_version: 1.1.2
 coredns_image_repo: "docker.io/coredns/coredns"
 coredns_image_tag: "{{ coredns_version }}"
-dnsmasq_nanny_image_repo: "gcr.io/google_containers/k8s-dns-dnsmasq-nanny-amd64"
+dnsmasq_nanny_image_repo: "gcr.io/google_containers/k8s-dns-dnsmasq-nanny--{{ image_arch }}"
 dnsmasq_nanny_image_tag: "{{ kubedns_version }}"
-dnsmasq_sidecar_image_repo: "gcr.io/google_containers/k8s-dns-sidecar-amd64"
+dnsmasq_sidecar_image_repo: "gcr.io/google_containers/k8s-dns-sidecar-{{ image_arch }}"
 dnsmasq_sidecar_image_tag: "{{ kubedns_version }}"
 dnsmasqautoscaler_version: 1.1.2
-dnsmasqautoscaler_image_repo: "gcr.io/google_containers/cluster-proportional-autoscaler-amd64"
+dnsmasqautoscaler_image_repo: "gcr.io/google_containers/cluster-proportional-autoscaler-{{ image_arch }}"
 dnsmasqautoscaler_image_tag: "{{ dnsmasqautoscaler_version }}"
 kubednsautoscaler_version: 1.1.2
-kubednsautoscaler_image_repo: "gcr.io/google_containers/cluster-proportional-autoscaler-amd64"
+kubednsautoscaler_image_repo: "gcr.io/google_containers/cluster-proportional-autoscaler-{{ image_arch }}"
 kubednsautoscaler_image_tag: "{{ kubednsautoscaler_version }}"
 test_image_repo: busybox
 test_image_tag: latest
@@ -515,7 +518,7 @@ downloads:
     enabled: "{{ cert_management == 'vault' }}"
     container: "{{ vault_deployment_type != 'host' }}"
     file: "{{ vault_deployment_type == 'host' }}"
-    dest: "vault/vault_{{ vault_version }}_linux_amd64.zip"
+    dest: "vault/vault_{{ vault_version }}_linux_{{ image_arch }}.zip"
     mode: "0755"
     owner: "vault"
     repo: "{{ vault_image_repo }}"

roles/kubernetes-apps/ansible/defaults/main.yml

@@ -14,13 +14,14 @@ kubedns_nodes_per_replica: 10
 coredns_replicas: 2
 
 # Images
-kubedns_image_repo: "gcr.io/google_containers/k8s-dns-kube-dns-amd64"
+image_arch: "{{ image_arch | default('amd64') }}"
+kubedns_image_repo: "gcr.io/google_containers/k8s-dns-kube-dns-{{ image_arch }}"
 kubedns_image_tag: "{{ kubedns_version }}"
-dnsmasq_nanny_image_repo: "gcr.io/google_containers/k8s-dns-dnsmasq-nanny-amd64"
+dnsmasq_nanny_image_repo: "gcr.io/google_containers/k8s-dns-dnsmasq-nanny-{{ image_arch }}"
 dnsmasq_nanny_image_tag: "{{ kubedns_version }}"
-dnsmasq_sidecar_image_repo: "gcr.io/google_containers/k8s-dns-sidecar-amd64"
+dnsmasq_sidecar_image_repo: "gcr.io/google_containers/k8s-dns-sidecar-{{ image_arch }}"
 dnsmasq_sidecar_image_tag: "{{ kubedns_version }}"
-kubednsautoscaler_image_repo: "gcr.io/google_containers/cluster-proportional-autoscaler-amd64"
+kubednsautoscaler_image_repo: "gcr.io/google_containers/cluster-proportional-autoscaler-{{ image_arch }}"
 kubednsautoscaler_image_tag: "{{ kubednsautoscaler_version }}"
 
 # Netchecker
@@ -43,7 +44,7 @@ netchecker_server_memory_requests: 64M
 
 # Dashboard
 dashboard_enabled: true
-dashboard_image_repo: gcr.io/google_containers/kubernetes-dashboard-amd64
+dashboard_image_repo: gcr.io/google_containers/kubernetes-dashboard-{{ image_arch }}
 dashboard_image_tag: v1.8.3
 
 # Limits for dashboard

roles/vault/defaults/main.yml

@@ -21,10 +21,14 @@ vault_log_dir: "/var/log/vault"
 
 vault_version: 0.10.1
 vault_binary_checksum: 66f0f1b0b221d664dd5913f8697409d7401df4bb2a19c7277e8fbad152063fae
-vault_download_url: "https://releases.hashicorp.com/vault/{{ vault_version }}/vault_{{ vault_version }}_linux_amd64.zip"
+vault_download_url: "https://releases.hashicorp.com/vault/{{ vault_version }}/vault_{{ vault_version }}_linux_{{ image_arch }}.zip"
+
+# Arch of Docker images and needed packages
+image_arch: amd64
+
 vault_download_vars:
   container: "{{ vault_deployment_type != 'host' }}"
-  dest: "vault/vault_{{ vault_version }}_linux_amd64.zip"
+  dest: "vault/vault_{{ vault_version }}_linux_{{ image_arch }}.zip"
   enabled: true
   mode: "0755"
   owner: "vault"