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pvc
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Implement migration targets in client 

Addresses #11
This commit is contained in:
Joshua Boniface 2018-07-18 12:15:39 -04:00
parent eb23488486
commit f91e210f1a
1 changed files with 95 additions and 26 deletions
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121
pvc.py
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@ -354,20 +354,27 @@ def verifyNode(zk_conn, node):
click.echo('ERROR: No node named "{}" is present in the cluster.'.format(node))
exit(1)
#
# Find a migration target
#
def findTargetHypervisor(zk_conn, search_field, dom_uuid):
if search_field == 'mem':
return findTargetHypervisorMem(zk_conn, dom_uuid)
if search_field == 'load':
return findTargetHypervisorLoad(zk_conn, dom_uuid)
if search_field == 'vcpus':
return findTargetHypervisorVCPUs(zk_conn, dom_uuid)
if search_field == 'vms':
return findTargetHypervisorVMs(zk_conn, dom_uuid)
return None
def findTargetHypervisorMem(zk_conn, dom_uuid):
# Find a target node
most_allocfree = 0
target_hypervisor = None
hypervisor_list = zkhandler.listchildren(zk_conn, '/nodes')
# Get the list of valid target hypervisors
def getHypervisors(zk_conn, dom_uuid):
valid_hypervisor_list = {}
full_hypervisor_list = zkhandler.listchildren(zk_conn, '/nodes')
current_hypervisor = zkhandler.readdata(zk_conn, '/domains/{}/hypervisor'.format(dom_uuid))
for hypervisor in hypervisor_list:
for hypervisor in full_hypervisor_list:
daemon_state = zkhandler.readdata(zk_conn, '/nodes/{}/daemonstate'.format(hypervisor))
domain_state = zkhandler.readdata(zk_conn, '/nodes/{}/domainstate'.format(hypervisor))
@ -376,7 +383,18 @@ def findTargetHypervisorMem(zk_conn, dom_uuid):
if daemon_state != 'run' or domain_state != 'ready':
continue
valid_hypervisor_list.append(hypervisor)
return full_hypervisor_list
# via free memory (relative to allocated memory)
def findTargetHypervisorMem(zk_conn, dom_uuid):
most_allocfree = 0
target_hypervisor = None
hypervisor_list = getHypervisors(zk_conn, dom_uuid)
for hypervisor in hypervisor_list:
memalloc = int(zkhandler.readdata(zk_conn, '/nodes/{}/memalloc'.format(hypervisor)))
memused = int(zkhandler.readdata(zk_conn, '/nodes/{}/memused'.format(hypervisor)))
memfree = int(zkhandler.readdata(zk_conn, '/nodes/{}/memfree'.format(hypervisor)))
@ -389,6 +407,51 @@ def findTargetHypervisorMem(zk_conn, dom_uuid):
return target_hypervisor
# via load average
def findTargetHypervisorLoad(zk_conn, dom_uuid):
least_load = 9999
target_hypervisor = None
hypervisor_list = getHypervisors(zk_conn, dom_uuid)
for hypervisor in hypervisor_list:
load = int(zkhandler.readdata(zk_conn, '/nodes/{}/load'.format(hypervisor)))
if load < least_load:
least_load = load
target_hypevisor = hypervisor
return target_hypervisor
# via total vCPUs
def findTargetHypervisorVCPUs(zk_conn, dom_uuid):
least_vcpus = 9999
target_hypervisor = None
hypervisor_list = getHypervisors(zk_conn, dom_uuid)
for hypervisor in hypervisor_list:
vcpus = int(zkhandler.readdata(zk_conn, '/nodes/{}/vcpualloc'.format(hypervisor)))
if vcpus < least_vcpus:
least_vcpus = vcpus
target_hypervisor = hypervisor
return target_hypervisor
# via total VMs
def findTargetHypervisorVMs(zk_conn, dom_uuid):
least_vms = 9999
target_hypervisor = None
hypervisor_list = getHypervisors(zk_conn, dom_uuid)
for hypervisor in hypervisor_list:
vms = int(zkhandler.readdata(zk_conn, '/nodes/{}/domainscount'.format(hypervisor)))
if vms < least_vms:
least_vms = vms
target_hypervisor = hypervisor
return target_hypervisor
########################
########################
@ -680,13 +743,18 @@ def vm():
###############################################################################
@click.command(name='define', short_help='Define a new virtual machine from a Libvirt XML file.')
@click.option(
'-t', '--hypervisor', 'target_hypervisor', default=myhostname, show_default=True,
help='The home hypervisor for this domain.'
'-t', '--hypervisor', 'target_hypervisor',
help='The home hypervisor for this domain; autoselects if unspecified.'
)
@click.option(
'-s', '--selector', 'selector', default='mem',
type=click.Choice(['mem','load','vcpus','vms']),
help='Method to determine the optimal target hypervisor automatically.'
)
@click.argument(
'config', type=click.File()
)
def define_vm(config, target_hypervisor):
def define_vm(config, target_hypervisor, selector):
"""
Define a new virtual machine from Libvirt XML configuration file CONFIG.
"""
@ -704,6 +772,9 @@ def define_vm(config, target_hypervisor):
# Open a Zookeeper connection
zk_conn = startZKConnection(zk_host)
if target_hypervisor == None:
target_hypervisor = findTargetHypervisor(zk_conn, selector, dom_uuid)
# Verify node is valid
verifyNode(zk_conn, target_hypervisor)
@ -956,7 +1027,12 @@ def stop_vm(domain):
'-t', '--hypervisor', 'target_hypervisor', default=None,
help='The target hypervisor to migrate to. Autodetect based on most free RAM if unspecified.'
)
def move_vm(domain, target_hypervisor):
@click.option(
'-s', '--selector', 'selector', default='mem',
type=click.Choice(['mem','load','vcpus','vms']),
help='Method to determine the optimal target hypervisor automatically.'
)
def move_vm(domain, target_hypervisor, selector):
"""
Permanently move virtual machine DOMAIN, via live migration if running and possible, to another hypervisor node. DOMAIN may be a UUID or name.
"""
@ -980,7 +1056,7 @@ def move_vm(domain, target_hypervisor):
current_hypervisor = zk_conn.get('/domains/{}/hypervisor'.format(dom_uuid))[0].decode('ascii')
if target_hypervisor == None:
target_hypervisor = findTargetHypervisor(zk_conn, 'mem', dom_uuid)
target_hypervisor = findTargetHypervisor(zk_conn, selector, dom_uuid)
else:
if target_hypervisor == current_hypervisor:
click.echo('ERROR: The VM "{}" is already running on hypervisor "{}".'.format(dom_uuid, current_hypervisor))
@ -1019,11 +1095,16 @@ def move_vm(domain, target_hypervisor):
'-t', '--hypervisor', 'target_hypervisor', default=None,
help='The target hypervisor to migrate to. Autodetect based on most free RAM if unspecified.'
)
@click.option(
'-s', '--selector', 'selector', default='mem',
type=click.Choice(['mem','load','vcpus','vms']),
help='Method to determine the optimal target hypervisor automatically.'
)
@click.option(
'-f', '--force', 'force_migrate', is_flag=True, default=False,
help='Force migrate an already migrated VM.'
)
def migrate_vm(domain, target_hypervisor, force_migrate):
def migrate_vm(domain, target_hypervisor, selector, force_migrate):
"""
Temporarily migrate running virtual machine DOMAIN, via live migration if possible, to another hypervisor node. DOMAIN may be a UUID or name. If DOMAIN is not running, it will be started on the target node.
"""
@ -1062,19 +1143,7 @@ def migrate_vm(domain, target_hypervisor, force_migrate):
return
if target_hypervisor == None:
# Determine the best hypervisor to migrate the VM to based on active memory usage
hypervisor_list = zk_conn.get_children('/nodes')
most_memfree = 0
for hypervisor in hypervisor_list:
daemon_state = zk_conn.get('/nodes/{}/daemonstate'.format(hypervisor))[0].decode('ascii')
domain_state = zk_conn.get('/nodes/{}/domainstate'.format(hypervisor))[0].decode('ascii')
if daemon_state != 'run' or domain_state != 'ready' or hypervisor == current_hypervisor:
continue
memfree = int(zk_conn.get('/nodes/{}/memfree'.format(hypervisor))[0].decode('ascii'))
if memfree > most_memfree:
most_memfree = memfree
target_hypervisor = hypervisor
target_hypervisor = findTargetHypervisor(zk_conn, selector, dom_uuid)
else:
if target_hypervisor == current_hypervisor:
click.echo('ERROR: The VM "{}" is already running on hypervisor "{}".'.format(dom_uuid, current_hypervisor))