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Correct failure modes when undefining VM 

Undefining a VM would sometimes leave a remnant UUID in the
runningdomains list on the target hypervisor which persisted even
after restarting. This helps prevent that happening by splitting
the various undefine steps into separate try blocks, just in case
one fails.

Fixes #15
This commit is contained in:
Joshua Boniface 2018-08-09 00:29:27 -04:00
parent 2163143951
commit d205ef2072
1 changed files with 33 additions and 27 deletions
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60
pvc.py
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@ -962,37 +962,43 @@ def undefine_vm(domain):
dom_uuid = searchClusterByName(zk_conn, domain)
dom_name = searchClusterByUUID(zk_conn, dom_uuid)
if dom_uuid == None:
click.echo('ERROR: Could not find VM "{}" in the cluster!'.format(domain))
stopZKConnection(zk_conn)
return
# Shut down the VM
try:
current_vm_state = zk_conn.get('/domains/{}/state'.format(dom_uuid))[0].decode('ascii')
if current_vm_state != 'stop':
click.echo('Forcibly stopping VM "{}".'.format(dom_uuid))
# Set the domain into stop mode
transaction = zk_conn.transaction()
transaction.set_data('/domains/{}/state'.format(dom_uuid), 'stop'.encode('ascii'))
transaction.commit()
current_vm_state = zk_conn.get('/domains/{}/state'.format(dom_uuid))[0].decode('ascii')
if current_vm_state != 'stop':
click.echo('Forcibly stopping VM "{}".'.format(dom_uuid))
# Set the domain into stop mode
transaction = zk_conn.transaction()
transaction.set_data('/domains/{}/state'.format(dom_uuid), 'stop'.encode('ascii'))
transaction.commit()
# Wait for 3 seconds to allow state to flow to all hypervisors
click.echo('Waiting for cluster to update.')
time.sleep(1)
# Wait for 3 seconds to allow state to flow to all hypervisors
click.echo('Waiting for cluster to update.')
time.sleep(1)
except:
pass
# Gracefully terminate the class instances
click.echo('Deleting VM "{}" from nodes.'.format(dom_uuid))
zk_conn.set('/domains/{}/state'.format(dom_uuid), 'delete'.encode('ascii'))
time.sleep(5)
try:
click.echo('Deleting VM "{}" from nodes.'.format(dom_uuid))
zk_conn.set('/domains/{}/state'.format(dom_uuid), 'delete'.encode('ascii'))
time.sleep(5)
except:
pass
# Delete the configurations
click.echo('Undefining VM "{}".'.format(dom_uuid))
transaction = zk_conn.transaction()
transaction.delete('/domains/{}/state'.format(dom_uuid))
transaction.delete('/domains/{}/hypervisor'.format(dom_uuid))
transaction.delete('/domains/{}/lasthypervisor'.format(dom_uuid))
transaction.delete('/domains/{}/failedreason'.format(dom_uuid))
transaction.delete('/domains/{}/xml'.format(dom_uuid))
transaction.delete('/domains/{}'.format(dom_uuid))
transaction.commit()
try:
click.echo('Undefining VM "{}".'.format(dom_uuid))
transaction = zk_conn.transaction()
transaction.delete('/domains/{}/state'.format(dom_uuid))
transaction.delete('/domains/{}/hypervisor'.format(dom_uuid))
transaction.delete('/domains/{}/lasthypervisor'.format(dom_uuid))
transaction.delete('/domains/{}/failedreason'.format(dom_uuid))
transaction.delete('/domains/{}/xml'.format(dom_uuid))
transaction.delete('/domains/{}'.format(dom_uuid))
transaction.commit()
except:
pass
# Close the Zookeeper connection
stopZKConnection(zk_conn)