create kubelet client cert with correct group

cluster/common.sh

@@ -932,9 +932,20 @@ function generate-certs {
     tar xzf easy-rsa.tar.gz
     cd easy-rsa-master/easyrsa3
     ./easyrsa init-pki
+    # this puts the cert into pki/ca.crt and the key into pki/private/ca.key
     ./easyrsa --batch "--req-cn=${PRIMARY_CN}@$(date +%s)" build-ca nopass
     ./easyrsa --subject-alt-name="${SANS}" build-server-full "${MASTER_NAME}" nopass
-    ./easyrsa build-client-full kubelet nopass
+
+    download-cfssl
+
+    # make the config for the signer
+    echo '{"signing":{"default":{"expiry":"43800h","usages":["signing","key encipherment","client auth"]}}}' > "ca-config.json"
+    # create the kubelet client cert with the correct groups
+    echo '{"CN":"kubelet","names":[{"O":"system:nodes"}],"hosts":[""],"key":{"algo":"rsa","size":2048}}' | "${KUBE_TEMP}/cfssl/cfssl" gencert -ca=pki/ca.crt -ca-key=pki/private/ca.key -config=ca-config.json - | "${KUBE_TEMP}/cfssl/cfssljson" -bare kubelet
+    mv "kubelet-key.pem" "pki/private/kubelet.key"
+    mv "kubelet.pem" "pki/issued/kubelet.crt"
+    rm -f "kubelet.csr"
+
     ./easyrsa build-client-full kubecfg nopass) &>${cert_create_debug_output} || {
     # If there was an error in the subshell, just die.
     # TODO(roberthbailey): add better error handling here

cluster/gce/util.sh

@@ -726,6 +726,38 @@ function get-master-disk-size() {
   fi
 }
 
+# Downloads cfssl into ${KUBE_TEMP}/cfssl directory
+#
+# Assumed vars:
+#   KUBE_TEMP: temporary directory
+#
+function download-cfssl {
+  mkdir -p "${KUBE_TEMP}/cfssl"
+  pushd "${KUBE_TEMP}/cfssl"
+
+  kernel=$(uname -s)
+  case "${kernel}" in
+    Linux)
+      curl -s -L -o cfssl https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
+      curl -s -L -o cfssljson https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
+      ;;
+    Darwin)
+      curl -s -L -o cfssl https://pkg.cfssl.org/R1.2/cfssl_darwin-amd64
+      curl -s -L -o cfssljson https://pkg.cfssl.org/R1.2/cfssljson_darwin-amd64
+      ;;
+    *)
+      echo "Unknown, unsupported platform: ${kernel}." >&2
+      echo "Supported platforms: Linux, Darwin." >&2
+      exit 2
+  esac
+
+  chmod +x cfssl
+  chmod +x cfssljson
+
+  popd
+}
+
+
 # Generates SSL certificates for etcd cluster. Uses cfssl program.
 #
 # Assumed vars:
@@ -749,28 +781,10 @@ function create-etcd-certs {
   local ca_cert=${2:-}
   local ca_key=${3:-}
 
-  mkdir -p "${KUBE_TEMP}/cfssl"
+  download-cfssl
+
   pushd "${KUBE_TEMP}/cfssl"
 
-  kernel=$(uname -s)
-  case "${kernel}" in
-    Linux)
-      curl -s -L -o cfssl https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
-      curl -s -L -o cfssljson https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
-      ;;
-    Darwin)
-      curl -s -L -o cfssl https://pkg.cfssl.org/R1.2/cfssl_darwin-amd64
-      curl -s -L -o cfssljson https://pkg.cfssl.org/R1.2/cfssljson_darwin-amd64
-      ;;
-    *)
-      echo "Unknown, unsupported platform: ${kernel}." >&2
-      echo "Supported platforms: Linux, Darwin." >&2
-      exit 2
-  esac
-
-  chmod +x cfssl
-  chmod +x cfssljson
-
   cat >ca-config.json <<EOF
 {
     "signing": {