Add a script to create OpenStack setup

The script does the following:

     - Checks if the host has enough free memory of at-least 10G
     - Creates 2 virtual machines
     - Imports the virtual machines into libvirt
     - Checks if nested virtualization is enabled or not
     - Enables host-passthrough on Compute node
     - Takes a libvirt QCOW2 internal snapshot of Controller and Compute
       nodes
     - Starts the virtual machines

create-ostack-nodes.sh

@@ -0,0 +1,179 @@
+#!/bin/bash
+
+PROGNAME=`basename $0`
+
+CONTROLLER_NAME=$1
+CONTROLLER_DISK_SIZE=$2
+CONTROLLER_MEM=$3
+COMPUTE_NAME=$4
+COMPUTE_DISK_SIZE=$5
+COMPUTE_MEM=$6
+ROOTPW=$7
+IMAGES_HOME=/var/lib/libvirt/images
+CONTROLLER_IMAGE=$IMAGES_HOME/$CONTROLLER_NAME.qcow2
+COMPUTE_IMAGE=$IMAGES_HOME/$COMPUTE_NAME.qcow2
+
+usage () {
+    echo -e "
+    ***NOTE***: Ensure you have at-least 100G free disk space and
+                10G of free memory available before you invoke 
+                this script.
+
+    Usage: ./$PROGNAME CONTROLLER_NAME CONTROLLER_DISK_SIZE \\ \n \
+                           CONTROLLER_MEM COMPUTE_NAME \\ \n \
+                           COMPUTE_DISK_SIZE COMPUTE_MEM ROOTPW
+
+        This script aims to setup two virtual machines -- first one, an
+        OpenStack Controller node; second one, OpenStack Compute node.
+
+
+        Examples:
+
+            Create a Controller node with 40G disk, 4096MB memory and
+            a Compute node with 50G disk, 6144MB memory with root
+            password as 'fedora':
+
+                ./$PROGNAME controller 40G 4096 compute 50G 6144 fedora
+
+
+            Create a Controller node with 80G disk, 4096MB memory and
+            a Compute node with 120G disk, 8192MB memory, with root
+            password as 'fedora':
+
+                ./$PROGNAME controller 80G 4096 compute 120G 8192 fedora
+    "
+}
+
+# This must be run as root
+check_if_root() {
+    if [ `id -u` -ne 0 ] ; then
+        echo "Please run as 'root' to execute $PROGNAME."
+        exit 1
+    fi
+}
+
+
+# Check free memory on the host
+check_free_mem() {
+    echo "Checking for free memory on your host. . ."
+    FREEMEM=$(free -m | awk 'NR==3 {print $4}')
+    if [ "$FREEMEM" -lt "10000" ]; then
+        echo "Please ensure you have at-least 10G of free memory"
+        exit 255
+    fi
+}
+
+
+set_root_passwd() {
+    # Create a secure tmp directory
+    tmp=`(umask 077 && mktemp "vmpwdXXXXXXX") 2>/dev/null` && test $tmp
+    echo "Create root password for virtual machines. . ."
+    echo $ROOTPW > $tmp
+}
+
+
+create_nodes() {
+    # Create Controller node
+    echo "Preparing Controller node disk image. . ."
+    virt-builder fedora-20 \
+        --update \
+        --selinux-relabel \
+        --format qcow2 \
+        --size $CONTROLLER_DISK_SIZE \
+        --root-password file:$tmp \
+        -o $IMAGES_HOME/$CONTROLLER_NAME.qcow2 
+
+    # Create Compute node
+    echo "Preparing Compute node disk image. . ."
+    virt-builder fedora-20 \
+        --update \
+        --selinux-relabel \
+        --format qcow2 \
+        --size $COMPUTE_DISK_SIZE \
+        --root-password file:$tmp \
+        -o $IMAGES_HOME/$COMPUTE_NAME.qcow2
+
+    rm $tmp
+    return 0
+}
+
+
+# FIXME: Import with openstack libvirt networks
+import_nodes_into_libvirt() {
+    # Import the virtual machines into libvirt
+    echo "Importing Controller and Compute images into libvirt. .  ."
+    virt-install --name controller \
+        --ram $CONTROLLER_MEM \
+        --disk path=$CONTROLLER_IMAGE,format=qcow2 \
+        --import --noautoconsole --noreboot
+
+    # Import the Compute node disk image into libvirt
+    virt-install --name compute \
+        --ram $COMPUTE_MEM \
+        --disk path=$COMPUTE_IMAGE,format=qcow2 \
+        --import --noautoconsole --noreboot
+
+    return 0
+}
+
+
+check_kvm_nesting() {
+    CHECK_NESTING=$(cat /sys/module/kvm_intel/parameters/nested)
+    if [ "$CHECK_NESTING" != "Y" ]; then
+        echo "Please ensure you enable nested virt"
+        echo "To enable nested virt, add 'options kvm-intel nested=y'
+        (without quotes) to '/etc/modprobe.d/dist.conf', & reboot the
+        host."
+        exit 255
+    fi
+}
+
+
+enable_nested_virt() {
+    echo "Setup netsted virt on Compute host. . ."
+    virt-xml compute \
+        --edit \
+        --cpu host-passthrough,clearxml=yes
+}
+
+
+create_snapshot() {
+    # Take snapshots
+    echo "Taking snapshots. . ."
+    virsh snapshot-create-as \
+        controller snap1 "Pristine Fedora"
+    virsh snapshot-create-as \
+        compute snap1 "Pristine Fedora"
+
+    return 0
+}
+
+
+start_nodes() {
+    echo "Starting Controller and Compute nodes. . ."
+    virsh start controller
+    virsh start compute
+}
+
+
+# main()
+{
+
+    # check if min no. of arguments are 6
+    if [ "$#" != 7 ]; then
+        usage
+        exit 255
+    fi
+
+
+    check_if_root
+    check_free_mem
+    set_root_passwd
+    create_nodes
+    import_nodes_into_libvirt
+    check_kvm_nesting
+    enable_nested_virt
+    create_snapshot
+    start_nodes
+}
+