Create a swap partition if needed for new servers

Add a script to  handle cloud servers with no swap. This can be
used before install_puppet when developers run it by hand, and
is called directly by launch_node. If the host has
no swap, create a swap partition from the ephemeral disk and use
the remainder on /opt.

Change-Id: Iac8bfe4924d8607ddbddc45312a51fe52eb4cdbc

launch/launch-node.py

@@ -83,6 +83,10 @@ def bootstrap_server(server, admin_pass, key, cert, environment, name,
         ssh_client.ssh('ping6 -c5 -Q 0x10 review.openstack.org '
                        '|| ping6 -c5 -Q 0x10 wiki.openstack.org')
 
+    ssh_client.scp(os.path.join(SCRIPT_DIR, '..', 'make_swap.sh'),
+                   'make_swap.sh')
+    ssh_client.ssh('bash -x make_swap.sh')
+
     ssh_client.scp(os.path.join(SCRIPT_DIR, '..', 'install_puppet.sh'),
                    'install_puppet.sh')
     ssh_client.ssh('bash -x install_puppet.sh')

make_swap.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+
+# Copyright 2013 OpenStack Foundation
+#
+# 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.
+
+
+# If we're running on a cloud server with no swap, fix that:
+if [ `grep SwapTotal /proc/meminfo | awk '{ print $2; }'` -eq 0 ]; then
+    if [ -b /dev/vdb ]; then
+        DEV='/dev/vdb'
+    elif [ -b /dev/xvde ]; then
+        DEV='/dev/xvde'
+    fi
+    if [ -n "$DEV" ]; then
+        MEMKB=`grep MemTotal /proc/meminfo | awk '{print $2; }'`
+        # Use the nearest power of two in MB as the swap size.
+        # This ensures that the partitions below are aligned properly.
+        MEM=`python -c "import math ; print 2**int(round(math.log($MEMKB/1024, 2)))"`
+        umount ${DEV}
+        parted ${DEV} --script -- mklabel msdos
+        parted ${DEV} --script -- mkpart primary linux-swap 1 ${MEM}
+        parted ${DEV} --script -- mkpart primary ext2 ${MEM} -1
+        mkswap ${DEV}1
+        mkfs.ext4 ${DEV}2
+        swapon ${DEV}1
+        mount ${DEV}2 /mnt
+        rsync -a /opt/ /mnt/
+        umount /mnt
+        echo "${DEV}1  none  swap  sw                           0  0" >> /etc/fstab
+        echo "${DEV}2  /opt  ext4  errors=remount-ro,barrier=0  0  2" >> /etc/fstab
+        mount -a
+    fi
+fi
+