Use EBS for Master Data

Signed-off-by: Adam Sunderland <iterion@gmail.com>

cluster/aws/templates/setup-master-pd.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+
+# Copyright 2015 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.
+# Format and mount the disk, create directories on it for all of the master's
+# persistent data, and link them to where they're used.
+
+# Mount Master Persistent Disk
+echo "Mounting master-pd"
+mkdir -p /mnt/master-pd
+mkfs -t ext4 /dev/xvdh
+echo "/dev/xvdh  /mnt/master-pd  ext4  noatime  0 0" >> /etc/fstab
+
+# Contains all the data stored in etcd
+mkdir -m 700 -p /mnt/master-pd/var/etcd
+# Contains the dynamically generated apiserver auth certs and keys
+mkdir -p /mnt/master-pd/srv/kubernetes
+# Contains the cluster's initial config parameters and auth tokens
+mkdir -p /mnt/master-pd/srv/salt-overlay
+# Directory for kube-apiserver to store SSH key (if necessary)
+mkdir -p /mnt/master-pd/srv/sshproxy
+
+ln -s -f /mnt/master-pd/var/etcd /var/etcd
+ln -s -f /mnt/master-pd/srv/kubernetes /srv/kubernetes
+ln -s -f /mnt/master-pd/srv/sshproxy /srv/sshproxy
+ln -s -f /mnt/master-pd/srv/salt-overlay /srv/salt-overlay
+
+# This is a bit of a hack to get around the fact that salt has to run after the
+# PD and mounted directory are already set up. We can't give ownership of the
+# directory to etcd until the etcd user and group exist, but they don't exist
+# until salt runs if we don't create them here. We could alternatively make the
+# permissions on the directory more permissive, but this seems less bad.
+if ! id etcd &>/dev/null; then
+  useradd -s /sbin/nologin -d /var/etcd etcd
+fi
+chown -R etcd /mnt/master-pd/var/etcd
+chgrp -R etcd /mnt/master-pd/var/etcd