Default to Windows Server version 1809 for Windows nodes.

Removes all references to 1803, including moving "win1803" directory to
just "windows". A single Windows directory suffices for now, if
necessary in the future we can shard it into directories for each
Windows version.

We've been running tests with Windows 1809 nodes for a couple days in
our fork without major problems:
https://testgrid.k8s.io/google-windows#windows-prototype&width=20.
Testing on Azure is already using 1809:
https://testgrid.k8s.io/sig-windows#Conformance%20acs-engine%20on%20Azure&width=20.

cluster/gce/config-default.sh

@@ -65,7 +65,7 @@ MIG_WAIT_UNTIL_STABLE_TIMEOUT=${MIG_WAIT_UNTIL_STABLE_TIMEOUT:-1800}
 
 MASTER_OS_DISTRIBUTION=${KUBE_MASTER_OS_DISTRIBUTION:-${KUBE_OS_DISTRIBUTION:-gci}}
 NODE_OS_DISTRIBUTION=${KUBE_NODE_OS_DISTRIBUTION:-${KUBE_OS_DISTRIBUTION:-gci}}
-WINDOWS_NODE_OS_DISTRIBUTION=${WINDOWS_NODE_OS_DISTRIBUTION:-win1803}
+WINDOWS_NODE_OS_DISTRIBUTION=${WINDOWS_NODE_OS_DISTRIBUTION:-win1809}
 
 if [[ "${MASTER_OS_DISTRIBUTION}" == "cos" ]]; then
     MASTER_OS_DISTRIBUTION="gci"
@@ -478,4 +478,4 @@ fi
 
 # Taint Windows nodes by default to prevent Linux workloads from being
 # scheduled onto them.
-WINDOWS_NODE_TAINTS="${WINDOWS_NODE_TAINTS:-node.kubernetes.io/os=windows:NoSchedule}"
+WINDOWS_NODE_TAINTS="${WINDOWS_NODE_TAINTS:-node.kubernetes.io/os=win1809:NoSchedule}"

cluster/gce/config-test.sh

@@ -68,7 +68,7 @@ MIG_WAIT_UNTIL_STABLE_TIMEOUT=${MIG_WAIT_UNTIL_STABLE_TIMEOUT:-1800}
 
 MASTER_OS_DISTRIBUTION=${KUBE_MASTER_OS_DISTRIBUTION:-${KUBE_OS_DISTRIBUTION:-gci}}
 NODE_OS_DISTRIBUTION=${KUBE_NODE_OS_DISTRIBUTION:-${KUBE_OS_DISTRIBUTION:-gci}}
-WINDOWS_NODE_OS_DISTRIBUTION=${WINDOWS_NODE_OS_DISTRIBUTION:-win1803}
+WINDOWS_NODE_OS_DISTRIBUTION=${WINDOWS_NODE_OS_DISTRIBUTION:-win1809}
 
 if [[ "${MASTER_OS_DISTRIBUTION}" == "cos" ]]; then
     MASTER_OS_DISTRIBUTION="gci"
@@ -498,4 +498,4 @@ fi
 
 # Taint Windows nodes by default to prevent Linux workloads from being
 # scheduled onto them.
-WINDOWS_NODE_TAINTS="${WINDOWS_NODE_TAINTS:-node.kubernetes.io/os=windows:NoSchedule}"
+WINDOWS_NODE_TAINTS="${WINDOWS_NODE_TAINTS:-node.kubernetes.io/os=win1809:NoSchedule}"

cluster/gce/util.sh

@@ -32,7 +32,7 @@ else
   exit 1
 fi
 
-source "${KUBE_ROOT}/cluster/gce/${WINDOWS_NODE_OS_DISTRIBUTION}/node-helper.sh"
+source "${KUBE_ROOT}/cluster/gce/windows/node-helper.sh"
 
 if [[ "${MASTER_OS_DISTRIBUTION}" == "trusty" || "${MASTER_OS_DISTRIBUTION}" == "gci" || "${MASTER_OS_DISTRIBUTION}" == "ubuntu" ]]; then
   source "${KUBE_ROOT}/cluster/gce/${MASTER_OS_DISTRIBUTION}/master-helper.sh"
@@ -87,9 +87,7 @@ function set-linux-node-image() {
 #   WINDOWS_NODE_IMAGE_PROJECT
 function set-windows-node-image() {
   WINDOWS_NODE_IMAGE_PROJECT="windows-cloud"
-  if [[ "${WINDOWS_NODE_OS_DISTRIBUTION}" == "win1803" ]]; then
-    WINDOWS_NODE_IMAGE_FAMILY="windows-1803-core-for-containers"
-  elif [[ "${WINDOWS_NODE_OS_DISTRIBUTION}" == "win2019" ]]; then
+  if [[ "${WINDOWS_NODE_OS_DISTRIBUTION}" == "win2019" ]]; then
     WINDOWS_NODE_IMAGE_FAMILY="windows-2019-core-for-containers"
   elif [[ "${WINDOWS_NODE_OS_DISTRIBUTION}" == "win1809" ]]; then
     WINDOWS_NODE_IMAGE_FAMILY="windows-1809-core-for-containers"

cluster/gce/windows/README-GCE-Windows-kube-up.md

@@ -99,7 +99,7 @@ Invoke this script to run a smoke test that verifies that the cluster has been
 brought up correctly:
 
 ```
-cluster/gce/win1803/smoke-test.sh
+cluster/gce/windows/smoke-test.sh
 ```
 
 ## Running tests against the cluster

cluster/gce/windows/k8s-node-setup.psm1

@@ -27,10 +27,10 @@
     [Net.ServicePointManager]::SecurityProtocol = `
         [Net.SecurityProtocolType]::Tls12
     Invoke-WebRequest `
-        https://github.com/kubernetes/kubernetes/raw/windows-up/cluster/gce/win1803/k8s-node-setup.psm1 `
+        https://github.com/kubernetes/kubernetes/raw/master/cluster/gce/windows/k8s-node-setup.psm1 `
         -OutFile C:\k8s-node-setup.psm1
     Invoke-WebRequest `
-        https://github.com/kubernetes/kubernetes/raw/windows-up/cluster/gce/win1803/configure.ps1 `
+        https://github.com/kubernetes/kubernetes/raw/master/cluster/gce/windows/configure.ps1 `
         -OutFile C:\configure.ps1
     Import-Module -Force C:\k8s-node-setup.psm1  # -Force to override existing
     # Execute functions manually or run configure.ps1.
@@ -111,8 +111,8 @@ function WaitFor_GceMetadataServerRouteToBeRemoved {
 
 # Adds a route to the GCE metadata server to every network interface.
 function Add_GceMetadataServerRoute {
-  # Before setting up HNS the 1803 VM has a "vEthernet (nat)" interface and a
-  # "Ethernet" interface, and the route to the metadata server exists on the
+  # Before setting up HNS the Windows VM has a "vEthernet (nat)" interface and
+  # a "Ethernet" interface, and the route to the metadata server exists on the
   # Ethernet interface. After adding the HNS network a "vEthernet (Ethernet)"
   # interface is added, and it seems to subsume the routes of the "Ethernet"
   # interface (trying to add routes on the Ethernet interface at this point just
@@ -259,17 +259,14 @@ function Download-HelperScripts {
 }
 
 # Takes the Windows version string from the cluster bash scripts (e.g.
-# 'win1803') and returns the correct label to use for containers on this
+# 'win1809') and returns the correct label to use for containers on this
 # version of Windows. Returns $null if $WinVersion is unknown.
 function Get_ContainerVersionLabel {
   param (
     [parameter(Mandatory=$true)] [string]$WinVersion
   )
   # -match does regular expression matching.
-  if ($WinVersion -match '1803') {
-    return '1803'
-  }
-  elseif ($WinVersion -match '1809') {
+  if ($WinVersion -match '1809') {
     return '1809'
   }
   elseif ($WinVersion -match '2019') {
@@ -281,8 +278,16 @@ function Get_ContainerVersionLabel {
 
 # Builds the pause image with name $INFRA_CONTAINER.
 function Create-PauseImage {
-  $version_label = Get_ContainerVersionLabel `
-      $(Get-InstanceMetadataValue 'win-version')
+  $win_version = $(Get-InstanceMetadataValue 'win-version')
+  if ($win_version -match '2019') {
+    # TODO(pjh): update this function to properly support 2019 vs. 1809 vs.
+    # future Windows versions. For example, Windows Server 2019 does not
+    # support the nanoserver container
+    # (https://blogs.technet.microsoft.com/virtualization/2018/11/13/windows-server-2019-now-available/).
+    Log_NotImplemented "Need to update Create-PauseImage for WS2019"
+  }
+
+  $version_label = Get_ContainerVersionLabel $win_version
   $pause_dir = "${env:K8S_DIR}\pauseimage"
   $dockerfile = "$pause_dir\Dockerfile"
   mkdir -Force $pause_dir
@@ -290,7 +295,7 @@ function Create-PauseImage {
     New-Item -Force -ItemType file $dockerfile | Out-Null
     Set-Content `
         $dockerfile `
-        ("FROM microsoft/nanoserver:${version_label}`n`n" +
+        ("FROM mcr.microsoft.com/windows/nanoserver:${version_label}`n`n" +
          "CMD cmd /c ping -t localhost > nul")
   }
 
@@ -300,6 +305,10 @@ function Create-PauseImage {
     return
   }
   docker build -t ${INFRA_CONTAINER} $pause_dir
+  if ($LastExitCode -ne 0) {
+    Log-Output -Fatal `
+        "docker build -t ${INFRA_CONTAINER} $pause_dir failed"
+  }
 }
 
 # Downloads the Kubernetes binaries from kube-env's NODE_BINARY_TAR_URL and

cluster/gce/windows/node-helper.sh

@@ -24,10 +24,10 @@ function get-windows-node-instance-metadata-from-file {
   # To get startup script output run "gcloud compute instances
   # get-serial-port-output <instance>" from the location where you're running
   # kube-up.
-  metadata+="windows-startup-script-ps1=${KUBE_ROOT}/cluster/gce/${WINDOWS_NODE_OS_DISTRIBUTION}/configure.ps1,"
-  metadata+="common-psm1=${KUBE_ROOT}/cluster/gce/${WINDOWS_NODE_OS_DISTRIBUTION}/common.psm1,"
-  metadata+="k8s-node-setup-psm1=${KUBE_ROOT}/cluster/gce/${WINDOWS_NODE_OS_DISTRIBUTION}/k8s-node-setup.psm1,"
-  metadata+="user-profile-psm1=${KUBE_ROOT}/cluster/gce/${WINDOWS_NODE_OS_DISTRIBUTION}/user-profile.psm1,"
+  metadata+="windows-startup-script-ps1=${KUBE_ROOT}/cluster/gce/windows/configure.ps1,"
+  metadata+="common-psm1=${KUBE_ROOT}/cluster/gce/windows/common.psm1,"
+  metadata+="k8s-node-setup-psm1=${KUBE_ROOT}/cluster/gce/windows/k8s-node-setup.psm1,"
+  metadata+="user-profile-psm1=${KUBE_ROOT}/cluster/gce/windows/user-profile.psm1,"
   metadata+="${NODE_EXTRA_METADATA}"
   echo "${metadata}"
 }