kube-up: Refactor kube-env into common; use in AWS

cluster/aws/templates/extract-kube-env.sh

+#!/bin/bash
+
+# Copyright 2016 The Kubernetes Authors All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apt-get-install python-yaml
+
+# kube-env has all the environment variables we care about, in a flat yaml format
+eval "$(python -c '
+import pipes,sys,yaml
+
+for k,v in yaml.load(sys.stdin).iteritems():
+  print("""readonly {var}={value}""".format(var = k, value = pipes.quote(str(v))))
+  print("""export {var}""".format(var = k))
+  ' < kube-env.yaml)"
+

cluster/aws/util.sh

@@ -53,6 +53,9 @@ if [[ "${KUBE_OS_DISTRIBUTION}" == "ubuntu" ]]; then
   KUBE_OS_DISTRIBUTION=vivid
 fi
 
+# For GCE script compatability
+OS_DISTRIBUTION=${KUBE_OS_DISTRIBUTION}
+
 case "${KUBE_OS_DISTRIBUTION}" in
   trusty|wheezy|jessie|vivid|coreos)
     source "${KUBE_ROOT}/cluster/aws/${KUBE_OS_DISTRIBUTION}/util.sh"
@@ -926,48 +929,24 @@ function start-master() {
   service_ip=$(echo "${octets[*]}" | sed 's/ /./g')
   MASTER_EXTRA_SANS="IP:${service_ip},DNS:kubernetes,DNS:kubernetes.default,DNS:kubernetes.default.svc,DNS:kubernetes.default.svc.${DNS_DOMAIN},DNS:${MASTER_NAME}"
 
+  write-master-env
 
   (
     # We pipe this to the ami as a startup script in the user-data field.  Requires a compatible ami
     echo "#! /bin/bash"
     echo "mkdir -p /var/cache/kubernetes-install"
     echo "cd /var/cache/kubernetes-install"
-    echo "readonly SALT_MASTER='${MASTER_INTERNAL_IP}'"
-    echo "readonly INSTANCE_PREFIX='${INSTANCE_PREFIX}'"
-    echo "readonly NODE_INSTANCE_PREFIX='${NODE_INSTANCE_PREFIX}'"
-    echo "readonly NON_MASQUERADE_CIDR='${NON_MASQUERADE_CIDR:-}'"
-    echo "readonly CLUSTER_IP_RANGE='${CLUSTER_IP_RANGE}'"
-    echo "readonly ALLOCATE_NODE_CIDRS='${ALLOCATE_NODE_CIDRS}'"
-    echo "readonly SERVER_BINARY_TAR_URL='${SERVER_BINARY_TAR_URL}'"
-    echo "readonly SALT_TAR_URL='${SALT_TAR_URL}'"
-    echo "readonly ZONE='${ZONE}'"
-    echo "readonly NUM_NODES='${NUM_NODES}'"
-    echo "readonly KUBE_USER='${KUBE_USER}'"
-    echo "readonly KUBE_PASSWORD='${KUBE_PASSWORD}'"
-    echo "readonly SERVICE_CLUSTER_IP_RANGE='${SERVICE_CLUSTER_IP_RANGE}'"
-    echo "readonly ENABLE_CLUSTER_MONITORING='${ENABLE_CLUSTER_MONITORING:-none}'"
-    echo "readonly ENABLE_CLUSTER_LOGGING='${ENABLE_CLUSTER_LOGGING:-false}'"
-    echo "readonly ENABLE_NODE_LOGGING='${ENABLE_NODE_LOGGING:-false}'"
-    echo "readonly LOGGING_DESTINATION='${LOGGING_DESTINATION:-}'"
-    echo "readonly ELASTICSEARCH_LOGGING_REPLICAS='${ELASTICSEARCH_LOGGING_REPLICAS:-}'"
-    echo "readonly ENABLE_CLUSTER_DNS='${ENABLE_CLUSTER_DNS:-false}'"
-    echo "readonly ENABLE_CLUSTER_UI='${ENABLE_CLUSTER_UI:-false}'"
-    echo "readonly RUNTIME_CONFIG='${RUNTIME_CONFIG}'"
-    echo "readonly DNS_REPLICAS='${DNS_REPLICAS:-}'"
-    echo "readonly DNS_SERVER_IP='${DNS_SERVER_IP:-}'"
-    echo "readonly DNS_DOMAIN='${DNS_DOMAIN:-}'"
-    echo "readonly ADMISSION_CONTROL='${ADMISSION_CONTROL:-}'"
-    echo "readonly MASTER_IP_RANGE='${MASTER_IP_RANGE:-}'"
-    echo "readonly KUBELET_TOKEN='${KUBELET_TOKEN}'"
-    echo "readonly KUBE_PROXY_TOKEN='${KUBE_PROXY_TOKEN}'"
-    echo "readonly DOCKER_STORAGE='${DOCKER_STORAGE:-}'"
-    echo "readonly MASTER_EXTRA_SANS='${MASTER_EXTRA_SANS:-}'"
-    echo "readonly NETWORK_PROVIDER='${NETWORK_PROVIDER:-}'"
-    echo "readonly OPENCONTRAIL_TAG='${OPENCONTRAIL_TAG:-}'"
-    echo "readonly OPENCONTRAIL_KUBERNETES_TAG='${OPENCONTRAIL_KUBERNETES_TAG:-}'"
-    echo "readonly OPENCONTRAIL_PUBLIC_SUBNET='${OPENCONTRAIL_PUBLIC_SUBNET:-}'"
-    echo "readonly E2E_STORAGE_TEST_ENVIRONMENT='${E2E_STORAGE_TEST_ENVIRONMENT:-}'"
+
+    echo "cat > kube-env.yaml << __EOF_MASTER_KUBE_ENV_YAML"
+    cat ${KUBE_TEMP}/master-kube-env.yaml
+    # TODO: get rid of these exceptions / harmonize with common or GCE
+    echo "SALT_MASTER: $(yaml-quote ${MASTER_INTERNAL_IP:-})"
+    echo "DOCKER_STORAGE: $(yaml-quote ${DOCKER_STORAGE:-})"
+    echo "MASTER_EXTRA_SANS: $(yaml-quote ${MASTER_EXTRA_SANS:-})"
+    echo "__EOF_MASTER_KUBE_ENV_YAML"
+
     grep -v "^#" "${KUBE_ROOT}/cluster/aws/templates/common.sh"
+    grep -v "^#" "${KUBE_ROOT}/cluster/aws/templates/extract-kube-env.sh"
     grep -v "^#" "${KUBE_ROOT}/cluster/aws/templates/format-disks.sh"
     grep -v "^#" "${KUBE_ROOT}/cluster/aws/templates/setup-master-pd.sh"
     grep -v "^#" "${KUBE_ROOT}/cluster/aws/templates/create-dynamic-salt-files.sh"

cluster/common.sh

@@ -442,6 +442,186 @@ function build-runtime-config() {
   fi
 }
 
+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.
+  if [[ "${REGISTER_MASTER_KUBELET:-}" == "true" ]]; then
+    KUBELET_APISERVER="${MASTER_NAME}"
+  fi
+
+  build-kube-env true "${KUBE_TEMP}/master-kube-env.yaml"
+}
+
+function write-node-env {
+  build-kube-env false "${KUBE_TEMP}/node-kube-env.yaml"
+}
+
+# $1: if 'true', we're building a master yaml, else a node
+function build-kube-env {
+  local master=$1
+  local file=$2
+
+  build-runtime-config
+
+  rm -f ${file}
+  cat >$file <<EOF
+ENV_TIMESTAMP: $(yaml-quote $(date -u +%Y-%m-%dT%T%z))
+INSTANCE_PREFIX: $(yaml-quote ${INSTANCE_PREFIX})
+NODE_INSTANCE_PREFIX: $(yaml-quote ${NODE_INSTANCE_PREFIX})
+CLUSTER_IP_RANGE: $(yaml-quote ${CLUSTER_IP_RANGE:-10.244.0.0/16})
+SERVER_BINARY_TAR_URL: $(yaml-quote ${SERVER_BINARY_TAR_URL})
+SERVER_BINARY_TAR_HASH: $(yaml-quote ${SERVER_BINARY_TAR_HASH})
+SALT_TAR_URL: $(yaml-quote ${SALT_TAR_URL})
+SALT_TAR_HASH: $(yaml-quote ${SALT_TAR_HASH})
+SERVICE_CLUSTER_IP_RANGE: $(yaml-quote ${SERVICE_CLUSTER_IP_RANGE})
+KUBERNETES_MASTER_NAME: $(yaml-quote ${MASTER_NAME})
+ALLOCATE_NODE_CIDRS: $(yaml-quote ${ALLOCATE_NODE_CIDRS:-false})
+ENABLE_CLUSTER_MONITORING: $(yaml-quote ${ENABLE_CLUSTER_MONITORING:-none})
+ENABLE_L7_LOADBALANCING: $(yaml-quote ${ENABLE_L7_LOADBALANCING:-none})
+ENABLE_CLUSTER_LOGGING: $(yaml-quote ${ENABLE_CLUSTER_LOGGING:-false})
+ENABLE_CLUSTER_UI: $(yaml-quote ${ENABLE_CLUSTER_UI:-false})
+ENABLE_NODE_LOGGING: $(yaml-quote ${ENABLE_NODE_LOGGING:-false})
+LOGGING_DESTINATION: $(yaml-quote ${LOGGING_DESTINATION:-})
+ELASTICSEARCH_LOGGING_REPLICAS: $(yaml-quote ${ELASTICSEARCH_LOGGING_REPLICAS:-})
+ENABLE_CLUSTER_DNS: $(yaml-quote ${ENABLE_CLUSTER_DNS:-false})
+ENABLE_CLUSTER_REGISTRY: $(yaml-quote ${ENABLE_CLUSTER_REGISTRY:-false})
+CLUSTER_REGISTRY_DISK: $(yaml-quote ${CLUSTER_REGISTRY_DISK:-})
+CLUSTER_REGISTRY_DISK_SIZE: $(yaml-quote ${CLUSTER_REGISTRY_DISK_SIZE:-})
+DNS_REPLICAS: $(yaml-quote ${DNS_REPLICAS:-})
+DNS_SERVER_IP: $(yaml-quote ${DNS_SERVER_IP:-})
+DNS_DOMAIN: $(yaml-quote ${DNS_DOMAIN:-})
+KUBELET_TOKEN: $(yaml-quote ${KUBELET_TOKEN:-})
+KUBE_PROXY_TOKEN: $(yaml-quote ${KUBE_PROXY_TOKEN:-})
+ADMISSION_CONTROL: $(yaml-quote ${ADMISSION_CONTROL:-})
+MASTER_IP_RANGE: $(yaml-quote ${MASTER_IP_RANGE})
+RUNTIME_CONFIG: $(yaml-quote ${RUNTIME_CONFIG})
+CA_CERT: $(yaml-quote ${CA_CERT_BASE64:-})
+KUBELET_CERT: $(yaml-quote ${KUBELET_CERT_BASE64:-})
+KUBELET_KEY: $(yaml-quote ${KUBELET_KEY_BASE64:-})
+NETWORK_PROVIDER: $(yaml-quote ${NETWORK_PROVIDER:-})
+OPENCONTRAIL_TAG: $(yaml-quote ${OPENCONTRAIL_TAG:-})
+OPENCONTRAIL_KUBERNETES_TAG: $(yaml-quote ${OPENCONTRAIL_KUBERNETES_TAG:-})
+OPENCONTRAIL_PUBLIC_SUBNET: $(yaml-quote ${OPENCONTRAIL_PUBLIC_SUBNET:-})
+E2E_STORAGE_TEST_ENVIRONMENT: $(yaml-quote ${E2E_STORAGE_TEST_ENVIRONMENT:-})
+KUBE_IMAGE_TAG: $(yaml-quote ${KUBE_IMAGE_TAG:-})
+KUBE_DOCKER_REGISTRY: $(yaml-quote ${KUBE_DOCKER_REGISTRY:-})
+MULTIZONE: $(yaml-quote ${MULTIZONE:-})
+NON_MASQUERADE_CIDR: $(yaml-quote ${NON_MASQUERADE_CIDR:-})
+EOF
+  if [ -n "${KUBELET_PORT:-}" ]; then
+    cat >>$file <<EOF
+KUBELET_PORT: $(yaml-quote ${KUBELET_PORT})
+EOF
+  fi
+  if [ -n "${KUBE_APISERVER_REQUEST_TIMEOUT:-}" ]; then
+    cat >>$file <<EOF
+KUBE_APISERVER_REQUEST_TIMEOUT: $(yaml-quote ${KUBE_APISERVER_REQUEST_TIMEOUT})
+EOF
+  fi
+  if [ -n "${TERMINATED_POD_GC_THRESHOLD:-}" ]; then
+    cat >>$file <<EOF
+TERMINATED_POD_GC_THRESHOLD: $(yaml-quote ${TERMINATED_POD_GC_THRESHOLD})
+EOF
+  fi
+  if [[ "${OS_DISTRIBUTION}" == "trusty" ]]; then
+    cat >>$file <<EOF
+KUBE_MANIFESTS_TAR_URL: $(yaml-quote ${KUBE_MANIFESTS_TAR_URL})
+KUBE_MANIFESTS_TAR_HASH: $(yaml-quote ${KUBE_MANIFESTS_TAR_HASH})
+EOF
+  fi
+  if [ -n "${TEST_CLUSTER:-}" ]; then
+    cat >>$file <<EOF
+TEST_CLUSTER: $(yaml-quote ${TEST_CLUSTER})
+EOF
+  fi
+  if [ -n "${KUBELET_TEST_ARGS:-}" ]; then
+      cat >>$file <<EOF
+KUBELET_TEST_ARGS: $(yaml-quote ${KUBELET_TEST_ARGS})
+EOF
+  fi
+  if [ -n "${KUBELET_TEST_LOG_LEVEL:-}" ]; then
+      cat >>$file <<EOF
+KUBELET_TEST_LOG_LEVEL: $(yaml-quote ${KUBELET_TEST_LOG_LEVEL})
+EOF
+  fi
+  if [[ "${master}" == "true" ]]; then
+    # Master-only env vars.
+    cat >>$file <<EOF
+KUBERNETES_MASTER: $(yaml-quote "true")
+KUBE_USER: $(yaml-quote ${KUBE_USER})
+KUBE_PASSWORD: $(yaml-quote ${KUBE_PASSWORD})
+KUBE_BEARER_TOKEN: $(yaml-quote ${KUBE_BEARER_TOKEN})
+MASTER_CERT: $(yaml-quote ${MASTER_CERT_BASE64:-})
+MASTER_KEY: $(yaml-quote ${MASTER_KEY_BASE64:-})
+KUBECFG_CERT: $(yaml-quote ${KUBECFG_CERT_BASE64:-})
+KUBECFG_KEY: $(yaml-quote ${KUBECFG_KEY_BASE64:-})
+KUBELET_APISERVER: $(yaml-quote ${KUBELET_APISERVER:-})
+ENABLE_MANIFEST_URL: $(yaml-quote ${ENABLE_MANIFEST_URL:-false})
+MANIFEST_URL: $(yaml-quote ${MANIFEST_URL:-})
+MANIFEST_URL_HEADER: $(yaml-quote ${MANIFEST_URL_HEADER:-})
+NUM_NODES: $(yaml-quote ${NUM_NODES})
+EOF
+    if [ -n "${APISERVER_TEST_ARGS:-}" ]; then
+      cat >>$file <<EOF
+APISERVER_TEST_ARGS: $(yaml-quote ${APISERVER_TEST_ARGS})
+EOF
+    fi
+    if [ -n "${APISERVER_TEST_LOG_LEVEL:-}" ]; then
+      cat >>$file <<EOF
+APISERVER_TEST_LOG_LEVEL: $(yaml-quote ${APISERVER_TEST_LOG_LEVEL})
+EOF
+    fi
+    if [ -n "${CONTROLLER_MANAGER_TEST_ARGS:-}" ]; then
+      cat >>$file <<EOF
+CONTROLLER_MANAGER_TEST_ARGS: $(yaml-quote ${CONTROLLER_MANAGER_TEST_ARGS})
+EOF
+    fi
+    if [ -n "${CONTROLLER_MANAGER_TEST_LOG_LEVEL:-}" ]; then
+      cat >>$file <<EOF
+CONTROLLER_MANAGER_TEST_LOG_LEVEL: $(yaml-quote ${CONTROLLER_MANAGER_TEST_LOG_LEVEL})
+EOF
+    fi
+    if [ -n "${SCHEDULER_TEST_ARGS:-}" ]; then
+      cat >>$file <<EOF
+SCHEDULER_TEST_ARGS: $(yaml-quote ${SCHEDULER_TEST_ARGS})
+EOF
+    fi
+    if [ -n "${SCHEDULER_TEST_LOG_LEVEL:-}" ]; then
+      cat >>$file <<EOF
+SCHEDULER_TEST_LOG_LEVEL: $(yaml-quote ${SCHEDULER_TEST_LOG_LEVEL})
+EOF
+    fi
+  else
+    # Node-only env vars.
+    cat >>$file <<EOF
+KUBERNETES_MASTER: $(yaml-quote "false")
+ZONE: $(yaml-quote ${ZONE})
+EXTRA_DOCKER_OPTS: $(yaml-quote ${EXTRA_DOCKER_OPTS:-})
+EOF
+    if [ -n "${KUBEPROXY_TEST_ARGS:-}" ]; then
+      cat >>$file <<EOF
+KUBEPROXY_TEST_ARGS: $(yaml-quote ${KUBEPROXY_TEST_ARGS})
+EOF
+    fi
+    if [ -n "${KUBEPROXY_TEST_LOG_LEVEL:-}" ]; then
+      cat >>$file <<EOF
+KUBEPROXY_TEST_LOG_LEVEL: $(yaml-quote ${KUBEPROXY_TEST_LOG_LEVEL})
+EOF
+    fi
+  fi
+  if [[ "${OS_DISTRIBUTION}" == "coreos" ]]; then
+    # CoreOS-only env vars. TODO(yifan): Make them available on other distros.
+    cat >>$file <<EOF
+KUBE_MANIFESTS_TAR_URL: $(yaml-quote ${KUBE_MANIFESTS_TAR_URL})
+KUBE_MANIFESTS_TAR_HASH: $(yaml-quote ${KUBE_MANIFESTS_TAR_HASH})
+KUBERNETES_CONTAINER_RUNTIME: $(yaml-quote ${CONTAINER_RUNTIME:-docker})
+RKT_VERSION: $(yaml-quote ${RKT_VERSION:-})
+RKT_PATH: $(yaml-quote ${RKT_PATH:-})
+KUBERNETES_CONFIGURE_CBR0: $(yaml-quote ${KUBERNETES_CONFIGURE_CBR0:-true})
+EOF
+  fi
+}
+
 function sha1sum-file() {
   if which shasum >/dev/null 2>&1; then
     shasum -a1 "$1" | awk '{ print $1 }'

cluster/gce/util.sh

@@ -457,20 +457,6 @@ function add-instance-metadata-from-file {
   done
 }
 
-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.
-  if [[ "${REGISTER_MASTER_KUBELET:-}" == "true" ]]; then
-    KUBELET_APISERVER="${MASTER_NAME}"
-  fi
-
-  build-kube-env true "${KUBE_TEMP}/master-kube-env.yaml"
-}
-
-function write-node-env {
-  build-kube-env false "${KUBE_TEMP}/node-kube-env.yaml"
-}
-
 # Create certificate pairs for the cluster.
 # $1: The public IP for the master.
 #
@@ -1318,168 +1304,3 @@ function restart-apiserver {
 function prepare-e2e() {
   detect-project
 }
-
-# $1: if 'true', we're building a master yaml, else a node
-function build-kube-env {
-  local master=$1
-  local file=$2
-
-  build-runtime-config
-
-  rm -f ${file}
-  cat >$file <<EOF
-ENV_TIMESTAMP: $(yaml-quote $(date -u +%Y-%m-%dT%T%z))
-INSTANCE_PREFIX: $(yaml-quote ${INSTANCE_PREFIX})
-NODE_INSTANCE_PREFIX: $(yaml-quote ${NODE_INSTANCE_PREFIX})
-CLUSTER_IP_RANGE: $(yaml-quote ${CLUSTER_IP_RANGE:-10.244.0.0/16})
-SERVER_BINARY_TAR_URL: $(yaml-quote ${SERVER_BINARY_TAR_URL})
-SERVER_BINARY_TAR_HASH: $(yaml-quote ${SERVER_BINARY_TAR_HASH})
-SALT_TAR_URL: $(yaml-quote ${SALT_TAR_URL})
-SALT_TAR_HASH: $(yaml-quote ${SALT_TAR_HASH})
-SERVICE_CLUSTER_IP_RANGE: $(yaml-quote ${SERVICE_CLUSTER_IP_RANGE})
-KUBERNETES_MASTER_NAME: $(yaml-quote ${MASTER_NAME})
-ALLOCATE_NODE_CIDRS: $(yaml-quote ${ALLOCATE_NODE_CIDRS:-false})
-ENABLE_CLUSTER_MONITORING: $(yaml-quote ${ENABLE_CLUSTER_MONITORING:-none})
-ENABLE_L7_LOADBALANCING: $(yaml-quote ${ENABLE_L7_LOADBALANCING:-none})
-ENABLE_CLUSTER_LOGGING: $(yaml-quote ${ENABLE_CLUSTER_LOGGING:-false})
-ENABLE_CLUSTER_UI: $(yaml-quote ${ENABLE_CLUSTER_UI:-false})
-ENABLE_NODE_LOGGING: $(yaml-quote ${ENABLE_NODE_LOGGING:-false})
-LOGGING_DESTINATION: $(yaml-quote ${LOGGING_DESTINATION:-})
-ELASTICSEARCH_LOGGING_REPLICAS: $(yaml-quote ${ELASTICSEARCH_LOGGING_REPLICAS:-})
-ENABLE_CLUSTER_DNS: $(yaml-quote ${ENABLE_CLUSTER_DNS:-false})
-ENABLE_CLUSTER_REGISTRY: $(yaml-quote ${ENABLE_CLUSTER_REGISTRY:-false})
-CLUSTER_REGISTRY_DISK: $(yaml-quote ${CLUSTER_REGISTRY_DISK})
-CLUSTER_REGISTRY_DISK_SIZE: $(yaml-quote ${CLUSTER_REGISTRY_DISK_SIZE})
-DNS_REPLICAS: $(yaml-quote ${DNS_REPLICAS:-})
-DNS_SERVER_IP: $(yaml-quote ${DNS_SERVER_IP:-})
-DNS_DOMAIN: $(yaml-quote ${DNS_DOMAIN:-})
-KUBELET_TOKEN: $(yaml-quote ${KUBELET_TOKEN:-})
-KUBE_PROXY_TOKEN: $(yaml-quote ${KUBE_PROXY_TOKEN:-})
-ADMISSION_CONTROL: $(yaml-quote ${ADMISSION_CONTROL:-})
-MASTER_IP_RANGE: $(yaml-quote ${MASTER_IP_RANGE})
-RUNTIME_CONFIG: $(yaml-quote ${RUNTIME_CONFIG})
-CA_CERT: $(yaml-quote ${CA_CERT_BASE64:-})
-KUBELET_CERT: $(yaml-quote ${KUBELET_CERT_BASE64:-})
-KUBELET_KEY: $(yaml-quote ${KUBELET_KEY_BASE64:-})
-NETWORK_PROVIDER: $(yaml-quote ${NETWORK_PROVIDER:-})
-OPENCONTRAIL_TAG: $(yaml-quote ${OPENCONTRAIL_TAG:-})
-OPENCONTRAIL_KUBERNETES_TAG: $(yaml-quote ${OPENCONTRAIL_KUBERNETES_TAG:-})
-OPENCONTRAIL_PUBLIC_SUBNET: $(yaml-quote ${OPENCONTRAIL_PUBLIC_SUBNET:-})
-E2E_STORAGE_TEST_ENVIRONMENT: $(yaml-quote ${E2E_STORAGE_TEST_ENVIRONMENT:-})
-KUBE_IMAGE_TAG: $(yaml-quote ${KUBE_IMAGE_TAG:-})
-KUBE_DOCKER_REGISTRY: $(yaml-quote ${KUBE_DOCKER_REGISTRY:-})
-MULTIZONE: $(yaml-quote ${MULTIZONE:-})
-EOF
-  if [ -n "${KUBELET_PORT:-}" ]; then
-    cat >>$file <<EOF
-KUBELET_PORT: $(yaml-quote ${KUBELET_PORT})
-EOF
-  fi
-  if [ -n "${KUBE_APISERVER_REQUEST_TIMEOUT:-}" ]; then
-    cat >>$file <<EOF
-KUBE_APISERVER_REQUEST_TIMEOUT: $(yaml-quote ${KUBE_APISERVER_REQUEST_TIMEOUT})
-EOF
-  fi
-  if [ -n "${TERMINATED_POD_GC_THRESHOLD:-}" ]; then
-    cat >>$file <<EOF
-TERMINATED_POD_GC_THRESHOLD: $(yaml-quote ${TERMINATED_POD_GC_THRESHOLD})
-EOF
-  fi
-  if [[ "${OS_DISTRIBUTION}" == "trusty" ]]; then
-    cat >>$file <<EOF
-KUBE_MANIFESTS_TAR_URL: $(yaml-quote ${KUBE_MANIFESTS_TAR_URL})
-KUBE_MANIFESTS_TAR_HASH: $(yaml-quote ${KUBE_MANIFESTS_TAR_HASH})
-EOF
-  fi
-  if [ -n "${TEST_CLUSTER:-}" ]; then
-    cat >>$file <<EOF
-TEST_CLUSTER: $(yaml-quote ${TEST_CLUSTER})
-EOF
-  fi
-  if [ -n "${KUBELET_TEST_ARGS:-}" ]; then
-      cat >>$file <<EOF
-KUBELET_TEST_ARGS: $(yaml-quote ${KUBELET_TEST_ARGS})
-EOF
-  fi
-  if [ -n "${KUBELET_TEST_LOG_LEVEL:-}" ]; then
-      cat >>$file <<EOF
-KUBELET_TEST_LOG_LEVEL: $(yaml-quote ${KUBELET_TEST_LOG_LEVEL})
-EOF
-  fi
-  if [[ "${master}" == "true" ]]; then
-    # Master-only env vars.
-    cat >>$file <<EOF
-KUBERNETES_MASTER: $(yaml-quote "true")
-KUBE_USER: $(yaml-quote ${KUBE_USER})
-KUBE_PASSWORD: $(yaml-quote ${KUBE_PASSWORD})
-KUBE_BEARER_TOKEN: $(yaml-quote ${KUBE_BEARER_TOKEN})
-MASTER_CERT: $(yaml-quote ${MASTER_CERT_BASE64:-})
-MASTER_KEY: $(yaml-quote ${MASTER_KEY_BASE64:-})
-KUBECFG_CERT: $(yaml-quote ${KUBECFG_CERT_BASE64:-})
-KUBECFG_KEY: $(yaml-quote ${KUBECFG_KEY_BASE64:-})
-KUBELET_APISERVER: $(yaml-quote ${KUBELET_APISERVER:-})
-ENABLE_MANIFEST_URL: $(yaml-quote ${ENABLE_MANIFEST_URL:-false})
-MANIFEST_URL: $(yaml-quote ${MANIFEST_URL:-})
-MANIFEST_URL_HEADER: $(yaml-quote ${MANIFEST_URL_HEADER:-})
-NUM_NODES: $(yaml-quote ${NUM_NODES})
-EOF
-    if [ -n "${APISERVER_TEST_ARGS:-}" ]; then
-      cat >>$file <<EOF
-APISERVER_TEST_ARGS: $(yaml-quote ${APISERVER_TEST_ARGS})
-EOF
-    fi
-    if [ -n "${APISERVER_TEST_LOG_LEVEL:-}" ]; then
-      cat >>$file <<EOF
-APISERVER_TEST_LOG_LEVEL: $(yaml-quote ${APISERVER_TEST_LOG_LEVEL})
-EOF
-    fi
-    if [ -n "${CONTROLLER_MANAGER_TEST_ARGS:-}" ]; then
-      cat >>$file <<EOF
-CONTROLLER_MANAGER_TEST_ARGS: $(yaml-quote ${CONTROLLER_MANAGER_TEST_ARGS})
-EOF
-    fi
-    if [ -n "${CONTROLLER_MANAGER_TEST_LOG_LEVEL:-}" ]; then
-      cat >>$file <<EOF
-CONTROLLER_MANAGER_TEST_LOG_LEVEL: $(yaml-quote ${CONTROLLER_MANAGER_TEST_LOG_LEVEL})
-EOF
-    fi
-    if [ -n "${SCHEDULER_TEST_ARGS:-}" ]; then
-      cat >>$file <<EOF
-SCHEDULER_TEST_ARGS: $(yaml-quote ${SCHEDULER_TEST_ARGS})
-EOF
-    fi
-    if [ -n "${SCHEDULER_TEST_LOG_LEVEL:-}" ]; then
-      cat >>$file <<EOF
-SCHEDULER_TEST_LOG_LEVEL: $(yaml-quote ${SCHEDULER_TEST_LOG_LEVEL})
-EOF
-    fi
-  else
-    # Node-only env vars.
-    cat >>$file <<EOF
-KUBERNETES_MASTER: $(yaml-quote "false")
-ZONE: $(yaml-quote ${ZONE})
-EXTRA_DOCKER_OPTS: $(yaml-quote ${EXTRA_DOCKER_OPTS:-})
-EOF
-    if [ -n "${KUBEPROXY_TEST_ARGS:-}" ]; then
-      cat >>$file <<EOF
-KUBEPROXY_TEST_ARGS: $(yaml-quote ${KUBEPROXY_TEST_ARGS})
-EOF
-    fi
-    if [ -n "${KUBEPROXY_TEST_LOG_LEVEL:-}" ]; then
-      cat >>$file <<EOF
-KUBEPROXY_TEST_LOG_LEVEL: $(yaml-quote ${KUBEPROXY_TEST_LOG_LEVEL})
-EOF
-    fi
-  fi
-  if [[ "${OS_DISTRIBUTION}" == "coreos" ]]; then
-    # CoreOS-only env vars. TODO(yifan): Make them available on other distros.
-    cat >>$file <<EOF
-KUBE_MANIFESTS_TAR_URL: $(yaml-quote ${KUBE_MANIFESTS_TAR_URL})
-KUBE_MANIFESTS_TAR_HASH: $(yaml-quote ${KUBE_MANIFESTS_TAR_HASH})
-KUBERNETES_CONTAINER_RUNTIME: $(yaml-quote ${CONTAINER_RUNTIME:-docker})
-RKT_VERSION: $(yaml-quote ${RKT_VERSION:-})
-RKT_PATH: $(yaml-quote ${RKT_PATH:-})
-KUBERNETES_CONFIGURE_CBR0: $(yaml-quote ${KUBERNETES_CONFIGURE_CBR0:-true})
-EOF
-  fi
-}