vmsnap.scenario

# This file can be used directly by 'phd', see 'build-all.sh' in this
# directory for how it can be invoked.  The only requirement is a list
# of nodes you'd like it to modify.
#
# The scope of each command-block is controlled by the preceeding
# 'target' line. 
#
# - target=all
#   The commands are executed on evey node provided
#
# - target=local
#   The commands are executed from the node hosting phd. When not
#   using phd, they should be run from some other independant host
#   (such as the puppet master)
#
# - target=$PHD_ENV_nodes{N}
#   The commands are executed on the Nth node provided.
#   For example, to run on only the first node would be target=$PHD_ENV_nodes1
#
# We start with 3 (or more, up to 16) nodes running a minimal CentOS 6
#
# Tasks to be performed include:
# - setting up the required repositories from which to download Openstack and the HA-Addon
# - disabling firewalls and SElinux. This is a necessary evil until the proper policies can be written.
# - creating network bridges for use by VMs hosting OpenStack services
# - normalizing network interface names
# - fixing multicast
# - removing /home and making the root partition as large as possible to maximumize the amount of space available to openstack

#################################
# Scenario Requirements Section #
#################################
= VARIABLES =
PHD_ENV_snapshot_name

#################################
# Scenario Requirements Section #
#################################
= REQUIREMENTS =
nodes: 3

######################
# Deployment Scripts #
######################
= SCRIPTS =

# links to snapshot management:
# https://kashyapc.fedorapeople.org/virt/infra.next-2015/Advanced-Snapshots-with-libvirt-and-QEMU.pdf
# http://lists.openstack.org/pipermail/openstack-dev/2013-June/010212.html
# https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html-single/Virtualization_Deployment_and_Administration_Guide/index.html#warning-live-snapshots

target=all
....
# get list of all VMs configured on a given host
vmlist=$(virsh list --all --name)

# check if snapshot already exists, otherwise take the snapshot
for vm in $vmlist; do
	if [ -f /localvms/${vm}-${PHD_ENV_snapshot_name}.cow ]; then
		echo "Snapshot ${PHD_ENV_snapshot_name} already exists"
		exit 0
	fi
	virsh snapshot-create-as --domain $vm ${PHD_ENV_snapshot_name} --diskspec vda,file=/localvms/${vm}-${PHD_ENV_snapshot_name}.cow,snapshot=external --disk-only --atomic
done
....