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import sys
from lxml import etree
import os
import glob
import common
from dha import DeploymentHardwareAdapter
exec_cmd = common.exec_cmd
err = common.err
log = common.log
check_dir_exists = common.check_dir_exists
check_file_exists = common.check_file_exists
check_if_root = common.check_if_root
class LibvirtEnvironment(object):
def __init__(self, storage_dir, dha_file):
self.dha = DeploymentHardwareAdapter(dha_file)
self.storage_dir = storage_dir
self.parser = etree.XMLParser(remove_blank_text=True)
self.file_dir = os.path.dirname(os.path.realpath(__file__))
self.network_dir = '%s/libvirt/networks' % self.file_dir
self.vm_dir = '%s/libvirt/vms' % self.file_dir
self.node_ids = self.dha.get_all_node_ids()
self.fuel_node_id = self.dha.get_fuel_node_id()
self.net_names = self.collect_net_names()
def create_storage(self, node_id, disk_path, disk_sizes):
if node_id == self.fuel_node_id:
disk_size = disk_sizes['fuel']
else:
role = self.dha.get_node_role(node_id)
disk_size = disk_sizes[role]
exec_cmd('fallocate -l %s %s' % (disk_size, disk_path))
def create_vms(self):
temp_dir = exec_cmd('mktemp -d')
disk_sizes = self.dha.get_disks()
for node_id in self.node_ids:
vm_name = self.dha.get_node_property(node_id, 'libvirtName')
vm_template = self.dha.get_node_property(node_id,
'libvirtTemplate')
disk_path = '%s/%s.raw' % (self.storage_dir, vm_name)
self.create_storage(node_id, disk_path, disk_sizes)
self.define_vm(vm_name, vm_template, temp_dir, disk_path)
exec_cmd('rm -fr %s' % temp_dir)
def define_vm(self, vm_name, vm_template, temp_dir, disk_path):
log('Creating VM %s with disks %s' % (vm_name, disk_path))
temp_vm_file = '%s/%s' % (temp_dir, vm_name)
exec_cmd('cp %s/%s %s' % (self.vm_dir, vm_template, temp_vm_file))
with open(temp_vm_file) as f:
vm_xml = etree.parse(f)
names = vm_xml.xpath('/domain/name')
for name in names:
name.text = vm_name
uuids = vm_xml.xpath('/domain/uuid')
for uuid in uuids:
uuid.getparent().remove(uuid)
disks = vm_xml.xpath('/domain/devices/disk')
for disk in disks:
sources = disk.xpath('source')
for source in sources:
source.set('file', disk_path)
with open(temp_vm_file, 'w') as f:
vm_xml.write(f, pretty_print=True, xml_declaration=True)
exec_cmd('virsh define %s' % temp_vm_file)
def create_networks(self):
for net_file in glob.glob('%s/*' % self.network_dir):
exec_cmd('virsh net-define %s' % net_file)
for net in self.net_names:
log('Creating network %s' % net)
exec_cmd('virsh net-autostart %s' % net)
exec_cmd('virsh net-start %s' % net)
def delete_networks(self):
for net in self.net_names:
log('Deleting network %s' % net)
exec_cmd('virsh net-destroy %s' % net, False)
exec_cmd('virsh net-undefine %s' % net, False)
def get_net_name(self, net_file):
with open(net_file) as f:
net_xml = etree.parse(f)
name_list = net_xml.xpath('/network/name')
for name in name_list:
net_name = name.text
return net_name
def collect_net_names(self):
net_list = []
for net_file in glob.glob('%s/*' % self.network_dir):
name = self.get_net_name(net_file)
net_list.append(name)
return net_list
def delete_vms(self):
for node_id in self.node_ids:
vm_name = self.dha.get_node_property(node_id, 'libvirtName')
r, c = exec_cmd('virsh dumpxml %s' % vm_name, False)
if c > 0:
log(r)
continue
self.undefine_vm_delete_disk(r, vm_name)
def undefine_vm_delete_disk(self, printout, vm_name):
disk_files = []
xml_dump = etree.fromstring(printout, self.parser)
disks = xml_dump.xpath('/domain/devices/disk')
for disk in disks:
sources = disk.xpath('source')
for source in sources:
source_file = source.get('file')
if source_file:
disk_files.append(source_file)
log('Deleting VM %s with disks %s' % (vm_name, disk_files))
exec_cmd('virsh destroy %s' % vm_name, False)
exec_cmd('virsh undefine %s' % vm_name, False)
for file in disk_files:
exec_cmd('rm -f %s' % file)
def setup_environment(self):
check_if_root()
check_dir_exists(self.network_dir)
check_dir_exists(self.vm_dir)
self.cleanup_environment()
self.create_vms()
self.create_networks()
def cleanup_environment(self):
self.delete_vms()
self.delete_networks()
def usage():
print '''
Usage:
python setup_environment.py <storage_directory> <dha_file>
Example:
python setup_environment.py /mnt/images dha.yaml
'''
def parse_arguments():
if len(sys.argv) != 3:
log('Incorrect number of arguments')
usage()
sys.exit(1)
storage_dir = sys.argv[-2]
dha_file = sys.argv[-1]
check_dir_exists(storage_dir)
check_file_exists(dha_file)
return storage_dir, dha_file
def main():
storage_dir, dha_file = parse_arguments()
virt = LibvirtEnvironment(storage_dir, dha_file)
virt.setup_environment()
if __name__ == '__main__':
main()
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