Generate a kubelet CA and kube-apiserver cert-pair for kubelet auth.

Plumb through to kubelet/kube-apiserver on gci & cvm.

cluster/common.sh

@@ -555,6 +555,7 @@ function write-master-env {
   fi
 
   build-kube-env true "${KUBE_TEMP}/master-kube-env.yaml"
+  build-kube-master-certs "${KUBE_TEMP}/kube-master-certs.yaml"
 }
 
 function write-node-env {
@@ -565,6 +566,15 @@ function write-node-env {
   build-kube-env false "${KUBE_TEMP}/node-kube-env.yaml"
 }
 
+function build-kube-master-certs {
+  local file=$1
+  rm -f ${file}
+  cat >$file <<EOF
+KUBEAPISERVER_CERT: $(yaml-quote ${KUBEAPISERVER_CERT_BASE64:-})
+KUBEAPISERVER_KEY: $(yaml-quote ${KUBEAPISERVER_KEY_BASE64:-})
+EOF
+}
+
 # $1: if 'true', we're building a master yaml, else a node
 function build-kube-env {
   local master=$1
@@ -777,6 +787,7 @@ EOF
 KUBERNETES_MASTER: $(yaml-quote "false")
 ZONE: $(yaml-quote ${ZONE})
 EXTRA_DOCKER_OPTS: $(yaml-quote ${EXTRA_DOCKER_OPTS:-})
+KUBELET_AUTH_CA_CERT: $(yaml-quote ${KUBELET_AUTH_CA_CERT_BASE64:-})
 EOF
     if [ -n "${KUBEPROXY_TEST_ARGS:-}" ]; then
       cat >>$file <<EOF
@@ -911,6 +922,9 @@ function create-certs {
   KUBELET_KEY_BASE64=$(cat "${CERT_DIR}/pki/private/kubelet.key" | base64 | tr -d '\r\n')
   KUBECFG_CERT_BASE64=$(cat "${CERT_DIR}/pki/issued/kubecfg.crt" | base64 | tr -d '\r\n')
   KUBECFG_KEY_BASE64=$(cat "${CERT_DIR}/pki/private/kubecfg.key" | base64 | tr -d '\r\n')
+  KUBELET_AUTH_CA_CERT_BASE64=$(cat "${KUBE_TEMP}/easy-rsa-master/kubelet/pki/ca.crt" | base64 | tr -d '\r\n')
+  KUBEAPISERVER_CERT_BASE64=$(cat "${KUBE_TEMP}/easy-rsa-master/kubelet/pki/issued/kube-apiserver.crt" | base64 | tr -d '\r\n')
+  KUBEAPISERVER_KEY_BASE64=$(cat "${KUBE_TEMP}/easy-rsa-master/kubelet/pki/private/kube-apiserver.key" | base64 | tr -d '\r\n')
 }
 
 # Runs the easy RSA commands to generate certificate files.
@@ -930,6 +944,8 @@ function generate-certs {
     cd "${KUBE_TEMP}"
     curl -L -O --connect-timeout 20 --retry 6 --retry-delay 2 https://storage.googleapis.com/kubernetes-release/easy-rsa/easy-rsa.tar.gz
     tar xzf easy-rsa.tar.gz
+    mkdir easy-rsa-master/kubelet
+    cp -r easy-rsa-master/easyrsa3/* easy-rsa-master/kubelet
     cd easy-rsa-master/easyrsa3
     ./easyrsa init-pki
     # this puts the cert into pki/ca.crt and the key into pki/private/ca.key
@@ -946,7 +962,11 @@ function generate-certs {
     mv "kubelet.pem" "pki/issued/kubelet.crt"
     rm -f "kubelet.csr"
 
-    ./easyrsa build-client-full kubecfg nopass) &>${cert_create_debug_output} || {
+    ./easyrsa build-client-full kubecfg nopass
+    cd ../kubelet
+    ./easyrsa init-pki
+    ./easyrsa --batch "--req-cn=kubelet@$(date +%s)" build-ca nopass
+    ./easyrsa build-client-full kube-apiserver nopass) &>${cert_create_debug_output} || {
     # If there was an error in the subshell, just die.
     # TODO(roberthbailey): add better error handling here
     cat "${cert_create_debug_output}" >&2

cluster/gce/configure-vm.sh

@@ -142,6 +142,23 @@ for k,v in yaml.load(sys.stdin).iteritems():
   ' < """${kube_env_yaml}""")"
 }
 
+function set-kube-master-certs() {
+  local kube_master_certs_yaml="${INSTALL_DIR}/kube_master_certs.yaml"
+
+  until curl-metadata kube-master-certs > "${kube_master_certs_yaml}"; do
+    echo 'Waiting for kube-master-certs...'
+    sleep 3
+  done
+
+  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_master_certs_yaml}""")"
+}
+
 function remove-docker-artifacts() {
   echo "== Deleting docker0 =="
   apt-get-install bridge-utils
@@ -613,6 +630,11 @@ EOF
     if [ -n "${SCHEDULING_ALGORITHM_PROVIDER:-}" ]; then
       cat <<EOF >>/srv/salt-overlay/pillar/cluster-params.sls
 scheduling_algorithm_provider: '$(echo "${SCHEDULING_ALGORITHM_PROVIDER}" | sed -e "s/'/''/g")'
+EOF
+    fi
+    if [ -n "${KUBELET_AUTH_CA_CERT:-}" ]; then
+      cat <<EOF >>/srv/salt-overlay/pillar/cluster-params.sls
+kubelet_auth_ca_cert: /var/lib/kubelet/kubelet_auth_ca.crt
 EOF
     fi
 }
@@ -659,6 +681,13 @@ function create-salt-master-auth() {
         echo "${KUBECFG_KEY:-}" | base64 --decode > /srv/kubernetes/kubecfg.key)
     fi
   fi
+  if [ ! -e /srv/kubernetes/kubeapiserver.cert ]; then
+    if [[ ! -z "${KUBEAPISERVER_CERT:-}" ]] && [[ ! -z "${KUBEAPISERVER_KEY:-}" ]]; then
+      (umask 077;
+        echo "${KUBEAPISERVER_CERT}" | base64 --decode > /srv/kubernetes/kubeapiserver.cert;
+        echo "${KUBEAPISERVER_KEY}" | base64 --decode > /srv/kubernetes/kubeapiserver.key)
+    fi
+  fi
   if [ ! -e "${BASIC_AUTH_FILE}" ]; then
     mkdir -p /srv/salt-overlay/salt/kube-apiserver
     (umask 077;
@@ -726,6 +755,11 @@ current-context: service-account-context
 EOF
 )
   fi
+  local -r kubelet_auth_ca_file="/srv/salt-overlay/salt/kubelet/kubelet_auth_ca.crt"
+  if [ ! -e "${kubelet_auth_ca_file}" ] && [[ ! -z "${KUBELET_AUTH_CA_CERT:-}" ]]; then
+    (umask 077;
+      echo "${KUBELET_AUTH_CA_CERT}" | base64 --decode > "${kubelet_auth_ca_file}")
+  fi
 }
 
 # This should happen both on cluster initialization and node upgrades.
@@ -1099,6 +1133,7 @@ if [[ -z "${is_push}" ]]; then
   [[ "${KUBERNETES_MASTER}" == "true" ]] && mount-master-pd
   create-salt-pillar
   if [[ "${KUBERNETES_MASTER}" == "true" ]]; then
+    set-kube-master-certs
     create-salt-master-auth
     create-salt-master-etcd-auth
     create-salt-master-kubelet-auth

cluster/gce/debian/master-helper.sh

@@ -87,7 +87,7 @@ function create-master-instance-internal() {
     --scopes "storage-ro,compute-rw,monitoring,logging-write" \
     --can-ip-forward \
     --metadata-from-file \
-      "startup-script=${KUBE_TEMP}/configure-vm.sh,kube-env=${KUBE_TEMP}/master-kube-env.yaml,cluster-name=${KUBE_TEMP}/cluster-name.txt" \
+      "startup-script=${KUBE_TEMP}/configure-vm.sh,kube-env=${KUBE_TEMP}/master-kube-env.yaml,cluster-name=${KUBE_TEMP}/cluster-name.txt,kube-master-certs=${KUBE_TEMP}/kube-master-certs.yaml" \
     --disk "name=${master_name}-pd,device-name=master-pd,mode=rw,boot=no,auto-delete=no" \
     --boot-disk-size "${MASTER_ROOT_DISK_SIZE:-10}" \
     ${preemptible_master}

cluster/gce/gci/configure-helper.sh

@@ -201,6 +201,10 @@ function create-master-auth {
     echo "${MASTER_CERT}" | base64 --decode > "${auth_dir}/server.cert"
     echo "${MASTER_KEY}" | base64 --decode > "${auth_dir}/server.key"
   fi
+  if [ ! -e "${auth_dir}/kubeapiserver.cert" ] && [[ ! -z "${KUBEAPISERVER_CERT:-}" ]] && [[ ! -z "${KUBEAPISERVER_KEY:-}" ]]; then
+    echo "${KUBEAPISERVER_CERT}" | base64 --decode > "${auth_dir}/kubeapiserver.cert"
+    echo "${KUBEAPISERVER_KEY}" | base64 --decode > "${auth_dir}/kubeapiserver.key"
+  fi
   local -r basic_auth_csv="${auth_dir}/basic_auth.csv"
   if [[ ! -e "${basic_auth_csv}" && -n "${KUBE_PASSWORD:-}" && -n "${KUBE_USER:-}" ]]; then
     echo "${KUBE_PASSWORD},${KUBE_USER},admin" > "${basic_auth_csv}"
@@ -344,6 +348,12 @@ current-context: service-account-context
 EOF
 }
 
+function create-kubelet-auth-ca {
+  if [[ -n "${KUBELET_AUTH_CA_CERT:-}" ]]; then
+    echo "${KUBELET_AUTH_CA_CERT}" | base64 --decode > "/var/lib/kubelet/kubelet_auth_ca.crt"
+  fi
+}
+
 # Uses KUBELET_CA_CERT (falling back to CA_CERT), KUBELET_CERT, and KUBELET_KEY
 # to generate a kubeconfig file for the kubelet to securely connect to the apiserver.
 # Set REGISTER_MASTER_KUBELET to true if kubelet on the master node
@@ -578,6 +588,9 @@ function start-kubelet {
   if [[ -n "${FEATURE_GATES:-}" ]]; then
     flags+=" --feature-gates=${FEATURE_GATES}"
   fi
+  if [ -n "${KUBELET_AUTH_CA_CERT:-}" ]; then
+    flags+=" --anonymous-auth=false --client-ca-file=/var/lib/kubelet/kubelet_auth_ca.crt"
+  fi
 
   local -r kubelet_env_file="/etc/default/kubelet"
   echo "KUBELET_OPTS=\"${flags}\"" > "${kubelet_env_file}"
@@ -793,6 +806,8 @@ function start-kube-apiserver {
   params+=" --secure-port=443"
   params+=" --tls-cert-file=/etc/srv/kubernetes/server.cert"
   params+=" --tls-private-key-file=/etc/srv/kubernetes/server.key"
+  params+=" --kubelet-client-certificate=/etc/srv/kubernetes/kubeapiserver.cert"
+  params+=" --kubelet-client-key=/etc/srv/kubernetes/kubeapiserver.key"
   params+=" --token-auth-file=/etc/srv/kubernetes/known_tokens.csv"
   if [[ -n "${KUBE_PASSWORD:-}" && -n "${KUBE_USER:-}" ]]; then
     params+=" --basic-auth-file=/etc/srv/kubernetes/basic_auth.csv"
@@ -1266,6 +1281,10 @@ fi
 
 source "${KUBE_HOME}/kube-env"
 
+if [[ -e "${KUBE_HOME}/kube-master-certs" ]]; then
+  source "${KUBE_HOME}/kube-master-certs"
+fi
+
 if [[ -n "${KUBE_USER:-}" ]]; then
   if ! [[ "${KUBE_USER}" =~ ^[-._@a-zA-Z0-9]+$ ]]; then
     echo "Bad KUBE_USER format."
@@ -1289,6 +1308,7 @@ if [[ "${KUBERNETES_MASTER:-}" == "true" ]]; then
   create-master-etcd-auth
 else
   create-kubelet-kubeconfig
+  create-kubelet-auth-ca
   create-kubeproxy-kubeconfig
 fi
 

cluster/gce/gci/configure.sh

@@ -54,6 +54,22 @@ for k,v in yaml.load(sys.stdin).iteritems():
   rm -f "${tmp_kube_env}"
 }
 
+function download-kube-master-certs {
+  # Fetch kube-env from GCE metadata server.
+  local -r tmp_kube_master_certs="/tmp/kube-master-certs.yaml"
+  curl --fail --retry 5 --retry-delay 3 --silent --show-error \
+    -H "X-Google-Metadata-Request: True" \
+    -o "${tmp_kube_master_certs}" \
+    http://metadata.google.internal/computeMetadata/v1/instance/attributes/kube-master-certs
+  # Convert the yaml format file into a shell-style file.
+  eval $(python -c '''
+import pipes,sys,yaml
+for k,v in yaml.load(sys.stdin).iteritems():
+  print("readonly {var}={value}".format(var = k, value = pipes.quote(str(v))))
+''' < "${tmp_kube_master_certs}" > "${KUBE_HOME}/kube-master-certs")
+  rm -f "${tmp_kube_master_certs}"
+}
+
 function validate-hash {
   local -r file="$1"
   local -r expected="$2"
@@ -208,6 +224,9 @@ set-broken-motd
 KUBE_HOME="/home/kubernetes"
 download-kube-env
 source "${KUBE_HOME}/kube-env"
+if [[ "${KUBERNETES_MASTER:-}" == "true" ]]; then
+  download-kube-master-certs
+fi
 install-kube-binary-config
 echo "Done for installing kubernetes files"
 

cluster/gce/gci/health-monitor.sh

@@ -38,14 +38,14 @@ function docker_monitoring {
 }
 
 function kubelet_monitoring {
-  echo "Wait for 2 minutes for kubelet to be fuctional"
+  echo "Wait for 2 minutes for kubelet to be functional"
   # TODO(andyzheng0831): replace it with a more reliable method if possible.
   sleep 120
   local -r max_seconds=10
   while [ 1 ]; do
-    if ! curl --insecure -m "${max_seconds}" -f -s https://127.0.0.1:${KUBELET_PORT:-10250}/healthz > /dev/null; then
+    if ! curl -m "${max_seconds}" -f -s http://127.0.0.1:10255/healthz > /dev/null; then
       echo "Kubelet is unhealthy!"
-      curl --insecure https://127.0.0.1:${KUBELET_PORT:-10250}/healthz
+      curl http://127.0.0.1:10255/healthz
       pkill kubelet
       # Wait for a while, as we don't want to kill it again before it is really up.
       sleep 60

cluster/gce/gci/master-helper.sh

@@ -89,7 +89,7 @@ function create-master-instance-internal() {
     --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/gci/master.yaml,configure-sh=${KUBE_ROOT}/cluster/gce/gci/configure.sh,cluster-name=${KUBE_TEMP}/cluster-name.txt,gci-update-strategy=${KUBE_TEMP}/gci-update.txt,gci-ensure-gke-docker=${KUBE_TEMP}/gci-ensure-gke-docker.txt,gci-docker-version=${KUBE_TEMP}/gci-docker-version.txt" \
+      "kube-env=${KUBE_TEMP}/master-kube-env.yaml,user-data=${KUBE_ROOT}/cluster/gce/gci/master.yaml,configure-sh=${KUBE_ROOT}/cluster/gce/gci/configure.sh,cluster-name=${KUBE_TEMP}/cluster-name.txt,gci-update-strategy=${KUBE_TEMP}/gci-update.txt,gci-ensure-gke-docker=${KUBE_TEMP}/gci-ensure-gke-docker.txt,gci-docker-version=${KUBE_TEMP}/gci-docker-version.txt,kube-master-certs=${KUBE_TEMP}/kube-master-certs.yaml" \
     --disk "name=${master_name}-pd,device-name=master-pd,mode=rw,boot=no,auto-delete=no" \
     --boot-disk-size "${MASTER_ROOT_DISK_SIZE:-10}" \
     ${preemptible_master}

cluster/saltbase/salt/kube-apiserver/kube-apiserver.manifest

@@ -82,6 +82,8 @@
 
 {% set cert_file = "--tls-cert-file=/srv/kubernetes/server.cert" -%}
 {% set key_file = "--tls-private-key-file=/srv/kubernetes/server.key" -%}
+{% set kubelet_cert_file = "--kubelet-client-certificate=/srv/kubernetes/kubeapiserver.cert" -%}
+{% set kubelet_key_file = "--kubelet-client-key=/srv/kubernetes/kubeapiserver.key" -%}
 {% set client_ca_file = "" -%}
 
 {% set secure_port = "6443" -%}
@@ -169,7 +171,7 @@
 {% endif -%}
 
 {% set params = address + " " + storage_backend + " " + etcd_servers + " " + etcd_servers_overrides + " " + cloud_provider + " " + cloud_config + " " + runtime_config + " " + feature_gates + " " + admission_control + " " + max_requests_inflight + " " + target_ram_mb + " " + service_cluster_ip_range + " " + client_ca_file + basic_auth_file + " " + min_request_timeout + " " + enable_garbage_collector + " " + etcd_quorum_read -%}
-{% set params = params + " " + cert_file + " " + key_file + " --secure-port=" + secure_port + token_auth_file + " " + bind_address + " " + log_level + " " + advertise_address  + " " + proxy_ssh_options + authz_mode + abac_policy_file + webhook_authentication_config + webhook_authorization_config + image_review_config -%}
+{% set params = params + " " + cert_file + " " + key_file + " " + kubelet_cert_file + " " + kubelet_key_file + " --secure-port=" + secure_port + token_auth_file + " " + bind_address + " " + log_level + " " + advertise_address  + " " + proxy_ssh_options + authz_mode + abac_policy_file + webhook_authentication_config + webhook_authorization_config + image_review_config -%}
 
 # test_args has to be kept at the end, so they'll overwrite any prior configuration
 {% if pillar['apiserver_test_args'] is defined -%}

cluster/saltbase/salt/kubelet/default

@@ -188,5 +188,10 @@
   {% set eviction_hard="--eviction-hard=" + pillar['eviction_hard'] %}
 {% endif -%}
 
+{% set kubelet_auth_ca_cert = "" %}
+{% if pillar['kubelet_auth_ca_cert'] is defined -%}
+  {% set kubelet_auth_ca_cert="--anonymous-auth=false --client-ca-file=" + pillar['kubelet_auth_ca_cert'] %}
+{% endif -%}
+
 # test_args has to be kept at the end, so they'll overwrite any prior configuration
-DAEMON_ARGS="{{daemon_args}} {{api_servers_with_port}} {{debugging_handlers}} {{hostname_override}} {{cloud_provider}} {{cloud_config}} {{config}} {{manifest_url}} --allow-privileged={{pillar['allow_privileged']}} {{log_level}} {{cluster_dns}} {{cluster_domain}} {{docker_root}} {{kubelet_root}}  {{non_masquerade_cidr}} {{cgroup_root}} {{system_container}} {{pod_cidr}} {{ master_kubelet_args }} {{cpu_cfs_quota}} {{network_plugin}} {{kubelet_port}} {{ hairpin_mode }} {{enable_custom_metrics}} {{runtime_container}} {{kubelet_container}} {{node_labels}} {{babysit_daemons}} {{eviction_hard}} {{feature_gates}} {{test_args}}"
+DAEMON_ARGS="{{daemon_args}} {{api_servers_with_port}} {{debugging_handlers}} {{hostname_override}} {{cloud_provider}} {{cloud_config}} {{config}} {{manifest_url}} --allow-privileged={{pillar['allow_privileged']}} {{log_level}} {{cluster_dns}} {{cluster_domain}} {{docker_root}} {{kubelet_root}}  {{non_masquerade_cidr}} {{cgroup_root}} {{system_container}} {{pod_cidr}} {{ master_kubelet_args }} {{cpu_cfs_quota}} {{network_plugin}} {{kubelet_port}} {{ hairpin_mode }} {{enable_custom_metrics}} {{runtime_container}} {{kubelet_container}} {{node_labels}} {{babysit_daemons}} {{eviction_hard}} {{kubelet_auth_ca_cert}} {{feature_gates}} {{test_args}}"

cluster/saltbase/salt/kubelet/init.sls

@@ -31,6 +31,15 @@
     - mode: 400
     - makedirs: true
 
+{% if pillar['kubelet_auth_ca_cert'] is defined %}
+/var/lib/kubelet/kubelet_auth_ca.crt:
+  file.managed:
+    - source: salt://kubelet/kubelet_auth_ca.crt
+    - user: root
+    - group: root
+    - mode: 400
+    - makedirs: true
+{% endif %}
 
 {% if pillar.get('is_systemd') %}
 
@@ -52,6 +61,7 @@ fix-service-kubelet:
       - file: {{ pillar.get('systemd_system_path') }}/kubelet.service
       - file: {{ environment_file }}
       - file: /var/lib/kubelet/kubeconfig
+      - file: /var/lib/kubelet/kubelet_auth_ca.crt
 
 {% else %}
 
@@ -79,6 +89,9 @@ kubelet:
 {% endif %}
       - file: {{ environment_file }}
       - file: /var/lib/kubelet/kubeconfig
+{% if pillar['kubelet_auth_ca_cert'] is defined  %}
+      - file: /var/lib/kubelet/kubelet_auth_ca.crt
+{% endif %}
 {% if pillar.get('is_systemd') %}
     - provider:
       - service: systemd

cluster/saltbase/salt/supervisor/kubelet-checker.sh

@@ -18,11 +18,6 @@
 # it detects a failure.  It then exits, and supervisord restarts it
 # which in turn restarts the kubelet.
 
-{% set kubelet_port = "10250" -%}
-{% if pillar['kubelet_port'] is defined -%}
-	{% set kubelet_port = pillar['kubelet_port'] -%}
-{% endif -%}
-
 /etc/init.d/kubelet stop
 /etc/init.d/kubelet start
 
@@ -32,9 +27,9 @@ sleep 60
 max_seconds=10
 
 while true; do
-  if ! curl --insecure -m ${max_seconds} -f -s https://127.0.0.1:{{kubelet_port}}/healthz > /dev/null; then
+if ! curl -m ${max_seconds} -f -s http://127.0.0.1:10255/healthz > /dev/null; then
     echo "kubelet failed!"
-    curl --insecure https://127.0.0.1:{{kubelet_port}}/healthz
+    curl http://127.0.0.1:10255/healthz
     exit 2
   fi
   sleep 10

cmd/kube-apiserver/app/options/options.go

@@ -69,7 +69,8 @@ func NewServerRunOptions() *ServerRunOptions {
 		EventTTL:    1 * time.Hour,
 		MasterCount: 1,
 		KubeletConfig: kubeletclient.KubeletClientConfig{
-			Port: ports.KubeletPort,
+			Port:         ports.KubeletPort,
+			ReadOnlyPort: ports.KubeletReadOnlyPort,
 			PreferredAddressTypes: []string{
 				string(api.NodeHostName),
 				string(api.NodeInternalIP),
@@ -151,6 +152,9 @@ func (s *ServerRunOptions) AddFlags(fs *pflag.FlagSet) {
 		"DEPRECATED: kubelet port.")
 	fs.MarkDeprecated("kubelet-port", "kubelet-port is deprecated and will be removed.")
 
+	fs.UintVar(&s.KubeletConfig.ReadOnlyPort, "kubelet-read-only-port", s.KubeletConfig.ReadOnlyPort,
+		"DEPRECATED: kubelet port.")
+
 	fs.DurationVar(&s.KubeletConfig.HTTPTimeout, "kubelet-timeout", s.KubeletConfig.HTTPTimeout,
 		"Timeout for kubelet operations.")
 

cmd/kube-apiserver/app/server.go

@@ -140,12 +140,15 @@ func Run(s *options.ServerRunOptions) error {
 		if s.KubeletConfig.Port == 0 {
 			return fmt.Errorf("must enable kubelet port if proxy ssh-tunneling is specified")
 		}
+		if s.KubeletConfig.ReadOnlyPort == 0 {
+			return fmt.Errorf("Must enable kubelet readonly port if proxy ssh-tunneling is specified.")
+		}
 		// Set up the tunneler
 		// TODO(cjcullen): If we want this to handle per-kubelet ports or other
 		// kubelet listen-addresses, we need to plumb through options.
 		healthCheckPath := &url.URL{
-			Scheme: "https",
+			Scheme: "http",
-			Host:   net.JoinHostPort("127.0.0.1", strconv.FormatUint(uint64(s.KubeletConfig.Port), 10)),
+			Host:   net.JoinHostPort("127.0.0.1", strconv.FormatUint(uint64(s.KubeletConfig.ReadOnlyPort), 10)),
 			Path:   "healthz",
 		}
 		tunneler = genericapiserver.NewSSHTunneler(s.SSHUser, s.SSHKeyfile, healthCheckPath, installSSH)

pkg/kubelet/client/kubelet_client.go

@@ -32,8 +32,9 @@ import (
 
 type KubeletClientConfig struct {
 	// Default port - used if no information about Kubelet port can be found in Node.NodeStatus.DaemonEndpoints.
-	Port        uint
+	Port         uint
-	EnableHttps bool
+	ReadOnlyPort uint
+	EnableHttps  bool
 
 	// PreferredAddressTypes - used to select an address from Node.NodeStatus.Addresses
 	PreferredAddressTypes []string