Add the GCE cluster name to instance metadata.

cluster/common.sh

@@ -427,6 +427,15 @@ function build-runtime-config() {
   :
 }
 
+# Writes the cluster name into a temporary file.
+# Assumed vars
+#   CLUSTER_NAME
+function write-cluster-name {
+  cat >"${KUBE_TEMP}/cluster-name.txt" << EOF
+${CLUSTER_NAME}
+EOF
+}
+
 function write-master-env {
   # If the user requested that the master be part of the cluster, set the
   # environment variable to program the master kubelet to register itself.

cluster/gce/config-default.sh

@@ -41,6 +41,7 @@ RKT_VERSION=${KUBE_RKT_VERSION:-0.5.5}
 
 NETWORK=${KUBE_GCE_NETWORK:-default}
 INSTANCE_PREFIX="${KUBE_GCE_INSTANCE_PREFIX:-kubernetes}"
+CLUSTER_NAME="${CLUSTER_NAME:-${INSTANCE_PREFIX}}"
 MASTER_NAME="${INSTANCE_PREFIX}-master"
 MASTER_TAG="${INSTANCE_PREFIX}-master"
 NODE_TAG="${INSTANCE_PREFIX}-minion"

cluster/gce/config-test.sh

@@ -41,6 +41,7 @@ RKT_VERSION=${KUBE_RKT_VERSION:-0.5.5}
 
 NETWORK=${KUBE_GCE_NETWORK:-e2e}
 INSTANCE_PREFIX="${KUBE_GCE_INSTANCE_PREFIX:-e2e-test-${USER}}"
+CLUSTER_NAME="${CLUSTER_NAME:-${INSTANCE_PREFIX}}"
 MASTER_NAME="${INSTANCE_PREFIX}-master"
 MASTER_TAG="${INSTANCE_PREFIX}-master"
 NODE_TAG="${INSTANCE_PREFIX}-minion"

cluster/gce/coreos/helper.sh

@@ -25,7 +25,8 @@ function create-node-instance-template() {
     "kube-env=${KUBE_TEMP}/node-kube-env.yaml" \
     "user-data=${KUBE_ROOT}/cluster/gce/coreos/node.yaml" \
     "configure-node=${KUBE_ROOT}/cluster/gce/coreos/configure-node.sh" \
-    "configure-kubelet=${KUBE_ROOT}/cluster/gce/coreos/configure-kubelet.sh"
+    "configure-kubelet=${KUBE_ROOT}/cluster/gce/coreos/configure-kubelet.sh" \
+    "cluster-name=${KUBE_TEMP}/cluster-name.txt"
 }
 
 
@@ -64,7 +65,7 @@ function create-master-instance() {
     --scopes "storage-ro,compute-rw,monitoring,logging-write" \
     --can-ip-forward \
     --metadata-from-file \
-      "kube-env=${KUBE_TEMP}/master-kube-env.yaml,user-data=${KUBE_ROOT}/cluster/gce/coreos/master.yaml,configure-node=${KUBE_ROOT}/cluster/gce/coreos/configure-node.sh,configure-kubelet=${KUBE_ROOT}/cluster/gce/coreos/configure-kubelet.sh" \
+      "kube-env=${KUBE_TEMP}/master-kube-env.yaml,user-data=${KUBE_ROOT}/cluster/gce/coreos/master.yaml,configure-node=${KUBE_ROOT}/cluster/gce/coreos/configure-node.sh,configure-kubelet=${KUBE_ROOT}/cluster/gce/coreos/configure-kubelet.sh,cluster-name=${KUBE_TEMP}/cluster-name.txt" \
     --disk "name=${MASTER_NAME}-pd,device-name=master-pd,mode=rw,boot=no,auto-delete=no" \
       ${preemptible_master}
 }

cluster/gce/debian/helper.sh

@@ -51,7 +51,7 @@ function create-master-instance {
     --scopes "storage-ro,compute-rw,monitoring,logging-write" \
     --can-ip-forward \
     --metadata-from-file \
-      "startup-script=${KUBE_ROOT}/cluster/gce/configure-vm.sh,kube-env=${KUBE_TEMP}/master-kube-env.yaml" \
+      "startup-script=${KUBE_ROOT}/cluster/gce/configure-vm.sh,kube-env=${KUBE_TEMP}/master-kube-env.yaml,cluster-name=${KUBE_TEMP}/cluster-name.txt" \
     --disk "name=${MASTER_NAME}-pd,device-name=master-pd,mode=rw,boot=no,auto-delete=no" \
     ${preemptible_master}
 }
@@ -61,5 +61,6 @@ function create-node-instance-template {
   local template_name="$1"
   create-node-template "$template_name" "${scope_flags}" \
     "startup-script=${KUBE_ROOT}/cluster/gce/configure-vm.sh" \
-    "kube-env=${KUBE_TEMP}/node-kube-env.yaml"
+    "kube-env=${KUBE_TEMP}/node-kube-env.yaml" \
+    "cluster-name=${KUBE_TEMP}/cluster-name.txt"
 }

cluster/gce/trusty/helper.sh

@@ -29,7 +29,8 @@ function create-node-instance-template {
   create-node-template "$template_name" "${scope_flags[*]}" \
     "kube-env=${KUBE_TEMP}/node-kube-env.yaml" \
     "user-data=${KUBE_ROOT}/cluster/gce/trusty/node.yaml" \
-    "configure-sh=${KUBE_ROOT}/cluster/gce/trusty/configure.sh"
+    "configure-sh=${KUBE_ROOT}/cluster/gce/trusty/configure.sh" \
+    "cluster-name=${KUBE_TEMP}/cluster-name.txt"
 }
 
 # create-master-instance creates the master instance. If called with
@@ -62,6 +63,6 @@ function create-master-instance {
     --scopes "storage-ro,compute-rw,monitoring,logging-write" \
     --can-ip-forward \
     --metadata-from-file \
-      "kube-env=${KUBE_TEMP}/master-kube-env.yaml,user-data=${KUBE_ROOT}/cluster/gce/trusty/master.yaml,configure-sh=${KUBE_ROOT}/cluster/gce/trusty/configure.sh" \
+      "kube-env=${KUBE_TEMP}/master-kube-env.yaml,user-data=${KUBE_ROOT}/cluster/gce/trusty/master.yaml,configure-sh=${KUBE_ROOT}/cluster/gce/trusty/configure.sh,cluster-name=${KUBE_TEMP}/cluster-name.txt" \
     --disk "name=${MASTER_NAME}-pd,device-name=master-pd,mode=rw,boot=no,auto-delete=no"
 }

cluster/gce/util.sh

@@ -393,9 +393,7 @@ function get-template-name-from-version {
 # Robustly try to create an instance template.
 # $1: The name of the instance template.
 # $2: The scopes flag.
-# $3: The minion start script metadata from file.
+# $3 and others: Metadata entries (must all be from a file).
-# $4: The kube-env metadata.
-# $5 and others: Additional user defined metadata.
 function create-node-template {
   detect-project
   local template_name="$1"
@@ -530,6 +528,7 @@ function kube-up {
   else
     check-existing
     create-network
+    write-cluster-name
     create-master
     create-nodes-firewall
     create-nodes-template