def safe_crushmap_update(self):
with open(os.devnull,
'w') as fnull, tempfile.TemporaryFile() as backup:
LOG.info("Saving crushmap for safe update")
try:
subprocess.check_call( # pylint: disable=not-callable
"ceph osd getcrushmap",
stdin=fnull,
stdout=backup,
stderr=fnull,
shell=True)
except subprocess.CalledProcessError as exc:
raise exception.CephFailure("failed to backup crushmap: %s" %
str(exc))
try:
yield
except exception.CephFailure:
backup.seek(0, os.SEEK_SET)
LOG.warn("Crushmap update failed. Restoring from backup")
subprocess.call( # pylint: disable=not-callable
"ceph osd setcrushmap",
stdin=backup,
stdout=fnull,
stderr=fnull,
shell=True)
raise
def _crushmap_tier_rename(self, old_name, new_name):
old_root_name = self._format_root_name(old_name)
new_root_name = self._format_root_name(new_name)
response, body = self._ceph_api.osd_crush_dump(body='json')
if response.status_code != requests.codes.ok:
raise exception.CephFailure(reason=response.reason)
# build map of buckets to be renamed
rename_map = {}
for buck in body['output']['buckets']:
name = buck['name']
if buck['type_name'] == 'root':
if name == old_root_name:
rename_map[name] = new_root_name
else:
old_suffix = '-{}'.format(old_name)
new_suffix = '-{}'.format(new_name)
if name.endswith(old_suffix):
rename_map[name] = name[:-len(old_suffix)] + new_suffix
conflicts = set(b['name'] for b in body['output']['buckets']) \
.intersection(set(rename_map.values()))
if conflicts:
raise exception.CephCrushTierRenameFailure(
tier=old_name,
reason=("Target buckets already exist: %s" %
', '.join(conflicts)))
old_rule_name = self._format_rule_name(old_name)
new_rule_name = self._format_rule_name(new_name)
response, body = self._ceph_api.osd_crush_rule_dump(new_rule_name)
if response.status_code == requests.codes.ok:
raise exception.CephCrushTierRenameFailure(
tier=old_name,
reason=("Target ruleset already exists %s" % new_rule_name))
for _from, _to in rename_map.items():
LOG.info("Rename bucket from '%s' to '%s'", _from, _to)
response, body = self._ceph_api.osd_crush_rename_bucket(_from, _to)
if response.status_code != requests.codes.ok:
raise exception.CephCrushTierRenameFailure(
tier=old_name, reason=response.reason)
LOG.info("Rename crush rule from '%s' to '%s'", old_rule_name,
new_rule_name)
response, body = self._ceph_api.osd_crush_rule_rename(
old_rule_name, new_rule_name)
if response.status_code != requests.codes.ok:
raise exception.CephCrushTierRenameFailure(tier=old_name,
reason=response.reason)